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Akbar AF, Perdomo D, Shou BL, Zhou AL, Ruck JM, Kilic A. Changes in Donor Utilization and Outcomes for Patients Bridged With Durable Left Ventricular Assist Device. ASAIO J 2024:00002480-990000000-00482. [PMID: 38728740 DOI: 10.1097/mat.0000000000002228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2024] Open
Abstract
We studied the impact of the 2018 heart allocation policy change on donor characteristics and posttransplant outcomes of left ventricular assist device (LVAD)-bridged heart transplant (HT) recipients. Left ventricular assist device-bridged adult HT recipients from October 2014 to October 2022 in the United Network for Organ Sharing database were categorized into old allocation policy (OAP) and new allocation policy (NAP) cohorts. Baseline characteristics, posttransplant outcomes, and subgroup analyses of unstable and stable LVAD-bridged recipients were assessed. The study included 7,384 HT recipients; 4,345 (58.8%) were transplanted in the OAP era and 3,039 (41.2%) in the NAP era. Old allocation policy recipients were most frequently status 1A at transplantation (71.1%), whereas NAP recipients were most frequently status 3 (40.0%), and status 4 (31.9%). Median donor sequence number (DSN) was higher in the NAP versus OAP era (9 vs. 3, p < 0.001). On multivariable analysis, NAP recipients had 20% higher 1 year mortality compared to OAP (adjusted hazard ratio [aHR] = 1.20 [95% confidence interval {CI}: 1.04-1.40], p = 0.01). Status 1 or 2 recipients had 28% higher 1 year mortality compared to status 1A (aHR = 1.28 [95% CI: 1.01-1.63], p = 0.04). Status 1 and 2 LVAD-supported recipients had higher mortality following the 2018 allocation change, indicating the need for closer surveillance of LVAD-bridged patients who may decompensate on the waitlist.
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Affiliation(s)
- Armaan F Akbar
- From the Division of Cardiac Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Dianela Perdomo
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Benjamin L Shou
- From the Division of Cardiac Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Alice L Zhou
- From the Division of Cardiac Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Jessica M Ruck
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Ahmet Kilic
- From the Division of Cardiac Surgery, Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
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Akbar AF, Zhou AL, Wang A, Feng ASN, Rizaldi AA, Ruck JM, Kilic A. Special Considerations for Advanced Heart Failure Surgeries: Durable Left Ventricular Devices and Heart Transplantation. J Cardiovasc Dev Dis 2024; 11:119. [PMID: 38667737 PMCID: PMC11050210 DOI: 10.3390/jcdd11040119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 04/08/2024] [Accepted: 04/13/2024] [Indexed: 04/28/2024] Open
Abstract
Heart transplantation and durable left ventricular assist devices (LVADs) represent two definitive therapies for end-stage heart failure in the modern era. Despite technological advances, both treatment modalities continue to experience unique risks that impact surgical and perioperative decision-making. Here, we review special populations and factors that impact risk in LVAD and heart transplant surgery and examine critical decisions in the management of these patients. As both heart transplantation and the use of durable LVADs as destination therapy continue to increase, these considerations will be of increasing relevance in managing advanced heart failure and improving outcomes.
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Affiliation(s)
| | | | | | | | | | | | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, The Johns Hopkins Hospital, 1800 Orleans Street, Zayed 7107, Baltimore, MD 21287, USA; (A.F.A.); (A.L.Z.); (A.W.); (A.S.N.F.); (A.A.R.); (J.M.R.)
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Kalra A, Ruck JM, Akbar AF, Zhou AL, Leng A, Casillan AJ, Ha JS, Merlo CA, Bush EL. Debunking the July Effect in lung transplantation recipients. JTCVS Open 2024; 18:376-399. [PMID: 38690438 PMCID: PMC11056481 DOI: 10.1016/j.xjon.2024.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 02/08/2024] [Indexed: 05/02/2024]
Abstract
Objective The "July Effect" is a theory that the influx of trainees from July to September negatively impacts patient outcomes. We aimed to study this theoretical phenomenon in lung transplant recipients given the highly technical nature of thoracic procedures. Methods Adult lung transplant hospitalizations were identified within the National Inpatient Sample (2005-2020). Recipients were categorized as academic Q1 (July to September) or Q2-Q4 (October to June). In-hospital mortality, operator-driven complications (pneumothorax, dehiscence including wound dehiscence, bronchial anastomosis, and others, and vocal cord/diaphragm paralysis, all 3 treated as a composite outcome), length of stay, and inflation-adjusted hospitalization charges were compared between both groups. Multivariable logistic regression was performed to assess the association between academic quarter and in-hospital mortality and operator-driven complications. The models were adjusted for recipient demographics and transplant characteristics. Subgroup analysis was performed between academic and nonacademic hospitals. Results Of 30,788 lung transplants, 7838 occurred in Q1 and 22,950 occurred in Q2-Q4. Recipient demographic and clinical characteristics were similar between groups. Dehiscence (n = 922, 4% vs n = 236, 3%), post-transplant cardiac arrest (n = 532, 2% vs n = 113, 1%), and pulmonary embolism (n = 712, 3% vs n = 164, 2%) were more common in Q2-Q4 versus Q1 recipients (all P < .05). Other operator-driven complications, in-hospital mortality, and resource use were similar between groups (P > .05). These inferences remained unchanged in adjusted analyses and on subgroup analyses of academic versus nonacademic hospitals. Conclusions The "July Effect" is not evident in US lung transplantation recipient outcomes during the transplant hospitalization. This suggests that current institutional monitoring systems for trainees across multiple specialties, including surgery, anesthesia, critical care, nursing, and others, are robust.
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Affiliation(s)
- Andrew Kalra
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
- Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pa
| | - Jessica M. Ruck
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Armaan F. Akbar
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alice L. Zhou
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Albert Leng
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alfred J. Casillan
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Jinny S. Ha
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Christian A. Merlo
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Errol L. Bush
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
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Zhou AL, Karius AK, Ruck JM, Shou BL, Larson EL, Casillan AJ, Ha JS, Shah PD, Merlo CA, Bush EL. Outcomes of Lung Transplant Candidates Aged ≥70 Years During the Lung Allocation Score Era. Ann Thorac Surg 2024; 117:725-732. [PMID: 37271446 PMCID: PMC10693648 DOI: 10.1016/j.athoracsur.2023.04.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 06/06/2023]
Abstract
BACKGROUND With the increasing age of lung transplant candidates, we studied waitlist and posttransplantation outcomes of candidates ≥70 years during the Lung Allocation Score era. METHODS Adult lung transplant candidates from 2005 to 2020 in the United Network for Organ Sharing database were included and stratified on the basis of age at listing into 18 to 59 years old, 60 to 69 years old, and ≥70 years old. Baseline characteristics, waitlist outcomes, and posttransplantation outcomes were assessed. RESULTS A total of 37,623 candidates were included (52.3% aged 18-59 years, 40.6% aged 60-69 years, 7.1% aged ≥70 years). Candidates ≥70 years were more likely than younger candidates to receive a transplant (81.9% vs 72.7% [aged 60-69 years] vs 61.6% [aged 18-59 years]) and less likely to die or to deteriorate on the waitlist within 1 year (9.1% vs 10.1% [aged 60-69 years] vs 12.2% [aged 18-59 years]; P < .001). Donors for older recipients were more likely to be extended criteria (75.7% vs 70.1% [aged 60-69 years] vs 65.7% [aged 18-59 years]; P < .001). Recipients ≥70 years were found to have lower rates of acute rejection (6.7% vs 7.4% [aged 60-69 years] vs 9.2% [aged 18-59 years]; P < .001) and prolonged intubation (21.7% vs 27.4% [aged 60-69 years] vs 34.5% [aged 18-59 years]; P < .001). Recipients aged ≥70 years had increased 1-year (adjusted hazard ratio [aHR], 1.19 [95% CI, 1.06-1.33]; P < .001), 3-year (aHR, 1.28 [95% CI, 1.18-1.39]; P < .001), and 5-year mortality (aHR, 1.29 [95% CI, 1.21-1.38]; P < .001) compared with recipients aged 60 to 69 years. CONCLUSIONS Candidates ≥70 years had favorable waitlist and perioperative outcomes despite increased use of extended criteria donors. Careful selection of candidates and postoperative surveillance may improve posttransplantation survival in this population.
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Affiliation(s)
- Alice L Zhou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Alexander K Karius
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Jessica M Ruck
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Benjamin L Shou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Emily L Larson
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Alfred J Casillan
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Jinny S Ha
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Pali D Shah
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland
| | - Christian A Merlo
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins Hospital, Baltimore, Maryland
| | - Errol L Bush
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
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Zaheer S, Zhou AL, Gross JM, Kilic A. Unusual presentation and delayed diagnosis of cardiac angiosarcoma. J Cardiothorac Surg 2024; 19:161. [PMID: 38549142 PMCID: PMC10979550 DOI: 10.1186/s13019-024-02555-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 01/30/2024] [Indexed: 04/01/2024] Open
Abstract
BACKGROUND Primary cardiac angiosarcomas are very rare and present aggressively with high rates of metastasis. Given the poor prognosis, particularly once disease has spread, early diagnosis and multidisciplinary treatment is essential. CASE PRESENTATION We present the case of a 46-year-old male who presented with chest pain, intermittent fevers, and dyspnea. Workup with computed tomography scan and transesophageal echocardiography demonstrated a right atrial pseudoaneurysm. Given the concern for rupture, the patient was taken to the operating room, where resection of the pseudoaneurysm and repair using a bovine pericardial patch was performed. Histopathology report initially demonstrated perivascular lymphocyte infiltrate. Six weeks later, the patient represented with chest pain and new word finding difficulty. Workup revealed multiple solid lung, pericardial, brain, and bone nodules. Eventual biopsy of a cardiophrenic nodule demonstrated angiosarcoma, and rereview of the original pathology slides confirmed the diagnosis of primary cardiac angiosarcoma. CONCLUSIONS Primary cardiac angiosarcomas are often misdiagnosed given the rarity of these tumors, but early diagnosis and initiation of treatment is essential. The unique presentation of our case demonstrates that clinical suspicion for cardiac angiosarcoma should be maintained for spontaneous pseudoaneurysm originating from the right atrium.
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Affiliation(s)
- Salman Zaheer
- Division of Cardiac Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, MD, USA.
| | - Alice L Zhou
- Division of Cardiac Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, MD, USA
| | - John M Gross
- Bone and Soft Tissue Pathology, The Johns Hopkins Hospital, 1800 Orleans Street, Zayed Tower Suite 7107, Baltimore, MD, 21287, USA
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, MD, USA.
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Zhou AL, Rizaldi AA, Akbar AF, Ruck JM, King EA, Kilic A. Outcomes following concomitant multiorgan heart transplantation from circulatory death donors: The United States experience. J Heart Lung Transplant 2024:S1053-2498(24)01535-3. [PMID: 38548240 DOI: 10.1016/j.healun.2024.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 02/03/2024] [Accepted: 03/16/2024] [Indexed: 04/11/2024] Open
Abstract
BACKGROUND Donation after circulatory death (DCD) has reemerged as a method of expanding the donor heart pool. Given the high waitlist mortality of multiorgan heart candidates, we evaluated waitlist outcomes associated with willingness to consider DCD offers and post-transplant outcomes following DCD transplant for these candidates. METHODS We identified adult multiorgan heart candidates and recipients between January 1, 2020 and March 31, 2023 nationally. Among candidates that met inclusion criteria, we compared the cumulative incidence of transplant, with waitlist death/deterioration as a competing risk, by willingness to consider DCD offers. Among recipients of DCD versus brain death (DBD) transplants, we compared perioperative outcomes and post-transplant survival. RESULTS Of 1,802 heart-kidney, 266 heart-liver, and 440 heart-lung candidates, 15.8%, 12.4%, and 31.1%, respectively, were willing to consider DCD offers. On adjusted analysis, willingness to consider DCD offers was associated with higher likelihood of transplant for all multiorgan heart candidates and decreased likelihood of waitlist deterioration for heart-lung candidates. Of 1,100 heart-kidney, 173 heart-liver, and 159 heart-lung recipients, 5.4%, 2.3%, and 2.5%, respectively, received DCD organs. Recipients of DCD and DBD heart-kidney transplants had a similar likelihood of perioperative outcomes and 1-year survival. All other DCD multiorgan heart recipients have survived to the last follow-up. CONCLUSIONS Multiorgan heart candidates who were willing to consider DCD offers had favorable waitlist outcomes, and heart-kidney recipients of DCD transplants had similar post-transplant outcomes to recipients of DBD transplants. We recommend the use of DCD organs to increase the donor pool for these high-risk candidates.
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Affiliation(s)
- Alice L Zhou
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Alexandra A Rizaldi
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Armaan F Akbar
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Jessica M Ruck
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Elizabeth A King
- Division of Transplant Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
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Zhou AL, Akbar AF, Kilic A. Normothermic regional perfusion in the United States: A call for improved data collection. J Heart Lung Transplant 2024:S1053-2498(24)01533-X. [PMID: 38521115 DOI: 10.1016/j.healun.2024.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/08/2024] [Accepted: 03/18/2024] [Indexed: 03/25/2024] Open
Affiliation(s)
- Alice L Zhou
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Armaan F Akbar
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland.
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Kalra A, Ruck JM, Zhou AL, Akbar AF, Shou BL, Casillan AJ, Ha JS, Merlo CA, Bush EL. Bigger pies, bigger slices: Increased hospitalization costs for lung transplantation recipients in the non-donation service area allocation era. J Thorac Cardiovasc Surg 2024:S0022-5223(24)00103-X. [PMID: 38678473 DOI: 10.1016/j.jtcvs.2024.01.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/23/2024] [Accepted: 01/24/2024] [Indexed: 05/01/2024]
Abstract
OBJECTIVE On November 24, 2017, lung transplant allocation switched from donation service area to a 250-nautical mile radius policy to improve equity in access to lung transplantation. Given the growing consideration of healthcare costs, we evaluated changes in hospitalization costs after this policy change. METHODS Lung transplant hospitalizations were identified within the National Inpatient Sample from 2005 to 2020. Recipients were categorized as donation service area era (August 2015 to October 2017) or non-donation service area era (December 2017 to February 2020). Median total hospitalization costs (inflation adjusted) were compared by era nationally and regionally. Multivariable generalized linear regression was performed to determine if the removal of the donation service area was associated with total hospitalization costs. The model was adjusted for recipient demographics, Charlson Comorbidity Index, hospitalization region, transplant type (single, double), and use of extracorporeal membrane oxygenation, ex vivo lung perfusion, and mechanical ventilation. RESULTS We analyzed 12,985 lung transplant recipients (median age of 61 years, 66% were male): 7070 in the donation service area era and 5915 in the non-donation service area era. Demographics were not different between recipients in both eras. Non-donation service area era recipients had greater extracorporeal membrane oxygenation use, mechanical ventilation (<24 hours), and longer length of stay than donation service area era recipients. Median total hospitalization costs for non-donation service area versus donation service area era recipients increased by $24,198 ($157,964 vs $182,162, percentage change = 15.32%, P < .001). Median costs increased in East North Central ($42,281) and Mountain ($35,521) regions (both P < .01). After adjustment, median costs for non-donation service area versus donation service area era recipients still increased ($19,168, 95% CI, 145-38,191, P = .048). CONCLUSIONS Hospitalization costs for lung transplant hospitalizations have increased from 2015 to 2020. The transition from donation service area-based allocation to the non-donation service area system may have contributed to this increase after 2017 by increasing access to transplant for sicker recipients.
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Affiliation(s)
- Andrew Kalra
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md; Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, Pa
| | - Jessica M Ruck
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alice L Zhou
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Armaan F Akbar
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Benjamin L Shou
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alfred J Casillan
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Jinny S Ha
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Christian A Merlo
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Errol L Bush
- Division of Thoracic Surgery, Johns Hopkins University School of Medicine, Baltimore, Md.
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Zhou AL, Jenkins RT, Ruck JM, Shou BL, Larson EL, Casillan AJ, Ha JS, Merlo CA, Bush EL. Outcomes of Recipients Aged 65 Years and Older Bridged to Lung Transplant With Extracorporeal Membrane Oxygenation. ASAIO J 2024; 70:230-238. [PMID: 37939695 PMCID: PMC10922625 DOI: 10.1097/mat.0000000000002092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023] Open
Abstract
Extracorporeal membrane oxygenation (ECMO) as a bridge to lung transplant (BTT) has been used for critically ill candidates with excellent outcomes, but data on this strategy in older recipients remain limited. We compared outcomes of no BTT, mechanical ventilation (MV)-only BTT, and ECMO BTT in recipients of greater than or equal to 65 years. Lung-only recipients of greater than or equal to 65 years in the United Network for Organ Sharing database between 2008 and 2022 were included and stratified by bridging strategy. Of the 9,936 transplants included, 226 (2.3%) were MV-only BTT and 159 (1.6%) were ECMO BTT. Extracorporeal membrane oxygenation BTT recipients were more likely to have restrictive disease pathology, had higher median lung allocation score, and spent fewer days on the waitlist (all p < 0.001). Compared to no-BTT recipients, ECMO BTT recipients were more likely to be intubated or on ECMO at 72 hours posttransplant and had longer hospital lengths of stay (all p < 0.001). Extracorporeal membrane oxygenation BTT recipients had increased risk of 3 years mortality compared to both no-BTT (adjusted hazard ratio [aHR] = 1.48 [95% confidence interval {CI}: 1.14-1.91], p = 0.003) and MV-only recipients (aHR = 1.50 [95% CI: 1.08-2.07], p = 0.02). Overall, we found that ECMO BTT in older recipients is associated with inferior posttransplant outcomes compared to MV-only or no BTT, but over half of recipients remained alive at 3 years posttransplant.
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Affiliation(s)
- Alice L. Zhou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Reed T. Jenkins
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Jessica M. Ruck
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Benjamin L. Shou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Emily L. Larson
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Alfred J. Casillan
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Jinny S. Ha
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
| | - Christian A. Merlo
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins Hospital
| | - Errol L. Bush
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital
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Zhou AL, Leng A, Ruck JM, Akbar AF, Desai NM, King EA. Kidney Donation After Circulatory Death Using Thoracoabdominal Normothermic Regional Perfusion: The Largest Report of the United States Experience. Transplantation 2024; 108:516-523. [PMID: 37691154 PMCID: PMC10840803 DOI: 10.1097/tp.0000000000004801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
BACKGROUND Thoracoabdominal normothermic regional perfusion (TA-NRP) has been increasingly used for donation after circulatory death (DCD) procurements in the United States. We present the largest report of outcomes of kidney transplants performed using DCD donor grafts perfused with TA-NRP. METHODS Adult DCD kidney transplants between 2020 and 2022 in the United Network for Organ Sharing database were included. Donors with ≥50 min between asystole and aortic cross-clamp time in which the heart was also transplanted were considered TA-NRP donors. All other donors were considered direct recovery donors. Multivariable regressions were used to assess delayed graft function, as well as posttransplant survival and all-cause graft failure at 30, 90, and 180 d. A propensity-matched analysis of cohorts matched on donor Kidney Donor Profile Index was performed. RESULTS Of the 16 140 total DCD kidney transplants performed during the study period, 306 (1.9%) used TA-NRP. TA-NRP donors were younger ( P < 0.001) and had lower Kidney Donor Profile Index ( P < 0.001) compared with direct recovery donors. Recipients receiving grafts recovered using TA-NRP were younger ( P < 0.001) and more likely to be blood group O ( P < 0.001). Transplants using TA-NRP had lower likelihood of delayed graft function (adjusted odds ratio 0.22 [95% confidence interval, 0.15-0.31], P < 0.001) but similar 180-d survival ( P = 0.8) and all-cause graft failure ( P = 0.3) as transplants using direct recovery grafts. These inferences were unchanged on propensity-matched analysis. CONCLUSIONS Our results demonstrate that kidney transplants using TA-NRP DCD allografts have positive short-term mortality and graft survival outcomes, with significantly decreased rates of delayed graft function compared with direct recovery DCD grafts.
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Affiliation(s)
- Alice L. Zhou
- Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Albert Leng
- Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Jessica M. Ruck
- Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Armaan F. Akbar
- Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Niraj M. Desai
- Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
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Ruck JM, Zhou AL, Florissi I, Ha JS, Shah PD, Massie AB, Segev DL, Merlo CA, Bush EL. Uptake and 1-year outcomes of lung transplantation for COVID-19. J Thorac Cardiovasc Surg 2024; 167:549-555.e1. [PMID: 37286074 PMCID: PMC10240904 DOI: 10.1016/j.jtcvs.2023.05.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 05/25/2023] [Accepted: 05/27/2023] [Indexed: 06/09/2023]
Abstract
OBJECTIVE End-stage lung disease from severe COVID-19 infection is an increasingly common indication for lung transplantation (LT), but there are limited data on outcomes. We evaluated 1-year COVID-19 LT outcomes. METHODS We identified all adult US LT recipients January 2020 to October 2022 in the Scientific Registry for Transplant Recipients, using diagnosis codes to identify recipients transplanted for COVID-19. We used multivariable regression to compare in-hospital acute rejection, prolonged ventilator support, tracheostomy, dialysis, and 1-year mortality between COVID-19 and non-COVID-19 recipients, adjusting for donor, recipient, and transplant characteristics. RESULTS LT for COVID-19 increased from 0.8% to 10.7% of total LT volume during 2020 to 2021. The number of centers performing LT for COVID-19 increased from 12 to 50. Recipients transplanted for COVID-19 were younger; were more likely to be male and Hispanic; were more likely to be on a ventilator, extracorporeal membrane oxygenation support, and dialysis pre-LT; were more likely to receive bilateral LT; and had higher lung allocation score and shorter waitlist time than other recipients (all P values < .001). COVID-19 LT had higher risk of prolonged ventilator support (adjusted odds ratio, 2.28; P < .001), tracheostomy (adjusted odds ratio 5.3; P < .001), and longer length of stay (median, 27 vs 19 days; P < .001). Risk of in-hospital acute rejection (adjusted odds ratio, 0.99; P = .95) and 1-year mortality (adjusted hazard ratio, 0.73; P = .12) were similar for COVID-19 LTs and LTs for other indications, even accounting for center-level differences. CONCLUSIONS COVID-19 LT is associated with higher risk of immediate postoperative complications but similar risk of 1-year mortality despite more severe pre-LT illness. These encouraging results support the ongoing use of LT for COVID-19-related lung disease.
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Affiliation(s)
- Jessica M Ruck
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alice L Zhou
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Isabella Florissi
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Jinny S Ha
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Pali D Shah
- Division of Pulmonology, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Allan B Massie
- Department of Surgery, NYU Langone School of Medicine, New York, NY; Department of Population Health, New York University Grossman School of Medicine and Langone Health, New York, NY
| | - Dorry L Segev
- Department of Surgery, NYU Langone School of Medicine, New York, NY; Department of Population Health, New York University Grossman School of Medicine and Langone Health, New York, NY; Scientific Registry of Transplant Recipients, Minneapolis, Minn
| | - Christian A Merlo
- Division of Pulmonology, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Errol L Bush
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md.
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12
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Casillan AJ, Zhou AL, Ruck JM, Larson EL, Etchill EW, Ha JS, Shah PD, Merlo CA, Bush EL. The effect of allograft ischemic time on outcomes following bilateral, single, and reoperative lung transplantation. J Thorac Cardiovasc Surg 2024; 167:556-565.e8. [PMID: 37286076 DOI: 10.1016/j.jtcvs.2023.05.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 04/24/2023] [Accepted: 05/24/2023] [Indexed: 06/09/2023]
Abstract
OBJECTIVE To determine whether allograft ischemic times affect outcomes following bilateral, single, and redo lung transplantation. METHODS A nationwide cohort of lung transplant recipients from 2005 through 2020 was examined using the Organ Procurement and Transplantation Network registry. The effects of standard (<6 hours) and extended (≥6 hours) ischemic times on outcomes following primary bilateral (n = 19,624), primary single (n = 688), redo bilateral (n = 8461), and redo single (n = 449) lung transplantation were analyzed. A priori subgroup analysis was performed in the primary and redo bilateral-lung transplant cohorts by further stratifying the extended ischemic time group into mild (≥6 and <8 hours), moderate (≥8 and <10 hours), and long (≥10 hours) subgroups. Primary outcomes included 30-day mortality, 1-year mortality, intubation at 72 hours' posttransplant, extracorporeal membrane oxygenation (ECMO) support at 72 hours' posttransplant, and a composite variable of intubation or ECMO at 72 hours' posttransplant. Secondary outcomes included acute rejection, postoperative dialysis, and hospital length of stay. RESULTS Recipients of allografts with ischemic times ≥6 hours experienced increased 30-day and 1-year mortality following primary bilateral-lung transplantation, but increased mortality was not observed following primary single, redo bilateral, or redo single-lung transplants. Extended ischemic times correlated with prolonged intubation or increased postoperative ECMO support in the primary bilateral, primary single, and redo bilateral-lung transplant cohorts but did not affect these outcomes following redo single-lung transplantation. CONCLUSIONS Since prolonged allograft ischemia correlates with worse transplant outcomes, the decision to use donor lungs with extended ischemic times must consider the specific benefits and risks associated with individual recipient factors and institutional expertise.
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Affiliation(s)
- Alfred J Casillan
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Alice L Zhou
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Jessica M Ruck
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Emily L Larson
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Eric W Etchill
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Jinny S Ha
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md
| | - Pali D Shah
- Division of Pulmonary & Critical Care Medicine, Department of Medicine, The Johns Hopkins Hospital, Baltimore, Md
| | - Christian A Merlo
- Division of Pulmonary & Critical Care Medicine, Department of Medicine, The Johns Hopkins Hospital, Baltimore, Md
| | - Errol L Bush
- Division of Thoracic Surgery, Department of Surgery, The Johns Hopkins Hospital, Baltimore, Md.
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13
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Zhou AL, Ruck JM, Casillan AJ, Larson EL, Shou BL, Ha JS, Shah PD, Merlo CA, Bush EL. National utilization, trends, and lung transplant outcomes of static versus portable ex vivo lung perfusion platforms. J Thorac Cardiovasc Surg 2023:S0022-5223(23)01202-3. [PMID: 38141853 DOI: 10.1016/j.jtcvs.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 11/20/2023] [Accepted: 12/16/2023] [Indexed: 12/25/2023]
Abstract
BACKGROUND This study compared utilization and outcomes of the 2 widely utilized ex vivo lung perfusion (EVLP) platforms in the United States: a static platform and a portable platform. METHODS Adult (age 18 years or older) bilateral lung-only transplants utilizing EVLP between February 28, 2018, and December 31, 2022, in the United Network for Organ Sharing database were included. Predischarge acute rejection, intubation at 72 hours posttransplant, extracorporeal membrane oxygenation at 72 hours posttransplant, primary graft dysfunction grade 3 at 72 hours posttransplant, 30-day mortality, and 1-year mortality were evaluated using multivariable regressions. RESULTS Overall, 607 (6.3%) lung transplants during the study period used EVLP (51.2% static, 48.8% portable). Static EVLP was primarily utilized in the eastern United States, whereas portable EVLP was primarily utilized in the western United States. Static EVLP donors were more likely to be donation after circulatory death (33.4% vs 26.0%; P = .005), have a >20 pack-year smoking history (13.5% vs 6.5%; P = .005), and be extended criteria donors (92.3% vs 85.0%; P = .013), whereas portable EVLP donors were more likely to be older than age 55 years (14.2% vs 8.0%; P = .02). Transplants utilizing the static and portable platforms had similar risk of acute rejection, intubation at 72 hours, extracorporeal membrane oxygenation at 72 hours, primary graft dysfunction grade 3 at 72 hours, and posttransplant mortality at 30 days and 1 year (all P values > .05). CONCLUSIONS The static and portable platforms had significant differences in donor characteristics and geographic distributions of utilization. Despite this, posttransplant survival was similar between the 2 EVLP platforms.
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Affiliation(s)
- Alice L Zhou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Jessica M Ruck
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Alfred J Casillan
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Emily L Larson
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Benjamin L Shou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Jinny S Ha
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md
| | - Pali D Shah
- Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins Hospital, Baltimore, Md
| | - Christian A Merlo
- Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins Hospital, Baltimore, Md
| | - Errol L Bush
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Md.
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14
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Zhou AL, Yesantharao LV, Etchill EW, Barbur I, Shou BL, Aziz H, Choi CW, Lawton JS, Kilic A. Costs and Readmissions Associated with Type A Aortic Dissections at High- and Low-Volume Centers. Heart Surg Forum 2023; 26:E694-E704. [PMID: 38178348 DOI: 10.59958/hsf.6821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 11/19/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND Costs and readmissions associated with type A aortic dissection repairs are not well understood. We investigated statewide readmissions, costs, and outcomes associated with the surgical management of type A aortic dissection repairs at low- and high-volume centers. METHODS We identified all adult type A aortic dissection patients who underwent operative repair in the Maryland Health Services Cost Review Commission's database (2012-2020). Hospitals were stratified into high- (top quartile of total repairs) or low-volume centers. RESULTS Of the 249 patients included, 193 (77.5%) were treated at a high-volume center. Patients treated at high- and low-volume centers had no differences in age, sex, race, primary payer, or severity (all p > 0.5). High- compared to low-volume centers had a greater proportion of patients transferred in (71.5% vs. 17.9%, p < 0.001). High-volume centers also had longer lengths of stay (12 vs. 8 days, p < 0.001), similar inpatient mortality (13.0% vs. 16.1%, p = 0.6), and similar proportion of patients readmitted (54.9% vs. 51.8%, p = 0.7). High-volume centers had greater index admission costs ($114,859 vs. $72,090, p < 0.001) and similar readmission costs ($48,367 vs. $42,204, p = 0.5). At high-volume centers, transferred patients compared to direct admissions had greater severity of illness (p = 0.05), similar mortality (p = 0.53), and greater lengths of stay (p = 0.05). CONCLUSIONS High-volume centers had a greater number of patients transferred from other institutions compared to low-volume centers. High-volume centers were associated with increased index admission resource utilization, with transfer patients having higher illness severity and greater resource utilization, yet similar mortality, compared to direct admission patients.
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Affiliation(s)
- Alice L Zhou
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Lekha V Yesantharao
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Eric W Etchill
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Iulia Barbur
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Benjamin L Shou
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Hamza Aziz
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Chun W Choi
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Jennifer S Lawton
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.
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15
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Zhou AL, Larson EL, Ruck JM, Ha JS, Casillan AJ, Bush EL. Current status and future potential of ex vivo lung perfusion in clinical lung transplantation. Artif Organs 2023; 47:1700-1709. [PMID: 37455548 DOI: 10.1111/aor.14607] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/29/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023]
Abstract
Lung transplantation is accepted as a well-established and effective treatment for patients with end-stage lung disease. While the number of candidates added to the waitlist continues to rise, the number of transplants performed remains limited by the number of suitable organ donors. Ex vivo lung perfusion (EVLP) emerged as a method of addressing the organ shortage by allowing the evaluation and potential reconditioning of marginal donor lungs or minimizing risks of prolonged ischemic time due to logistical challenges. The currently available FDA-approved EVLP systems have demonstrated excellent outcomes in clinical trials, and retrospective studies have demonstrated similar post-transplant survival between recipients who received marginal donor lungs perfused using EVLP and recipients who received standard criteria lungs stored using conventional methods. Despite this, widespread utilization has plateaued in the last few years, likely due to the significant costs associated with initiating EVLP programs. Centralized, dedicated EVLP perfusion centers are currently being investigated as a potential method of further expanding utilization of this technology. In the preclinical setting, potential applications of EVLP that are currently being studied include prolongation of organ preservation, reconditioning of unsuitable lungs, and further enhancement of already suitable lungs. As adoption of EVLP technology becomes more widespread, we may begin to see future implementation of these potential applications into the clinical setting.
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Affiliation(s)
- Alice L Zhou
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Emily L Larson
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Jessica M Ruck
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Jinny S Ha
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Alfred J Casillan
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Errol L Bush
- Division of Thoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
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16
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T Jenkins R, M Shah M, L Larson E, L Zhou A, M Ruck J, Kilic A. Expanding the Criteria for Heart Transplantation Donors: A Review of DCD, Increased Ischemic Times, HCV, HIV, and Extended Criteria Donors. Heart Surg Forum 2023; 26:E639-E655. [PMID: 37920074 DOI: 10.59958/hsf.6677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/26/2023] [Indexed: 11/04/2023]
Abstract
With the demand for heart transplantation continuing to outpace the available donor organs, previously underutilized donors are now being reconsidered. We sought to describe the emerging techniques and outcomes of expanded criteria heart transplantation. A comprehensive review of the recent literature concerning expanded donor selection in heart transplantation was performed using the PubMed MEDLINE database. To characterize trends in transplant practice, the United Network for Organ Sharing (UNOS/OPTN) registry was queried for all adult isolated heart transplants since 2010, and data regarding transplant parameters was collected. Donation after cardiac death (DCD), DCD with normothermic regional perfusion, increased ischemic time, hepatitis C positive donor organs, HIV-positive donor organs, and extended criteria donors were identified as promising avenues currently being explored to expand the number of donor organs. The utilization of various expanded criteria for heart transplantation was summarized since 2010 and showed an increasing use of these donor organs, contributing to the overall increasing frequency of heart transplantation. Utilization of expanded criteria for donor selection in heart transplantation has the potential to increase the supply of donor organs with comparable outcomes in selected recipients.
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Affiliation(s)
- Reed T Jenkins
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
| | - Manuj M Shah
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
| | - Emily L Larson
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
| | - Alice L Zhou
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
| | - Jessica M Ruck
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
| | - Ahmet Kilic
- Division of Cardiothoracic Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD 21218, USA.
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17
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Shou BL, Zhou AL, Ong CS, Alejo DE, DiNatale JM, Larson EL, Lawton JS, Schena S. Impact of intraoperative blood products, fluid administration, and persistent hypothermia on bleeding leading to reexploration after cardiac surgery. J Thorac Cardiovasc Surg 2023:S0022-5223(23)00967-4. [PMID: 37839660 DOI: 10.1016/j.jtcvs.2023.10.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 09/06/2023] [Accepted: 10/09/2023] [Indexed: 10/17/2023]
Abstract
OBJECTIVE Risk factors for severe postoperative bleeding after cardiac surgery remain multiple and incompletely elucidated. We evaluated the impact of intraoperative blood product transfusions, intravenous fluid administration, and persistently low core body temperature (CBT) at intensive care unit arrival on risk of perioperative bleeding leading to reexploration. METHODS We retrospectively queried our tertiary care center's Society of Thoracic Surgeons Institutional Database for all index, on-pump, adult cardiac surgery patients between July 2016 and September 2022. Intraoperative fluid (crystalloid and colloid) and blood product administrations, as well as perioperative CBT data, were harvested from electronic medical records. Linear and nonlinear mixed models, treating surgeon as a random effect to account for inter-surgeon practice differences, were used to assess the association between above factors and reexploration for bleeding. RESULTS Of 4037 patients, 151 (3.7%) underwent reexploration for bleeding. Reexplored patients experienced remarkably greater postoperative morbidity (23% vs 6%, P < .001) and 30-day mortality (14% vs 2%, P < .001). In linear models, progressively increasing IV crystalloid administration (adjusted odds ratio, 1.11, 95% confidence interval, 1.03-1.19) and decreasing CBT on intensive care unit arrival (adjusted odds ratio, 1.20; 95% confidence interval, 1.05-1.37) were associated with greater risk of bleeding leading to reexploration. Nonlinear analysis revealed increasing risk after ∼6 L of crystalloid administration and a U-shaped relationship between CBT and reexploration risk. Intraoperative blood product transfusion of any kind was not associated with reexploration. CONCLUSIONS We found evidence of both dilution- and hypothermia-related effects associated with perioperative bleeding leading to reexploration in cardiac surgery. Interventions targeting modification of such risk factors may decrease the rate this complication.
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Affiliation(s)
- Benjamin L Shou
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md.
| | - Alice L Zhou
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Chin Siang Ong
- Division of Cardiac Surgery, Yale School of Medicine, New Haven, Conn
| | - Diane E Alejo
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Joseph M DiNatale
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Emily L Larson
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Jennifer S Lawton
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Stefano Schena
- Division of Cardiothoracic Surgery, Medical College of Wisconsin, Milwaukee, Wis
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18
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Penikis AB, Zhou AL, Sferra SR, Engwall-Gill AJ, Miller JL, Baschat AA, Blakemore KJ, Kunisaki SM. Serial lung mass volume ratios as prognostic indicators of neonatal respiratory morbidity in fetal pulmonary malformations. Am J Obstet Gynecol MFM 2023; 5:101128. [PMID: 37572880 DOI: 10.1016/j.ajogmf.2023.101128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/02/2023] [Accepted: 08/05/2023] [Indexed: 08/14/2023]
Abstract
BACKGROUND Several studies have shown that the congenital pulmonary airway malformation volume ratio is a useful prognosticator of neonatal outcome in prenatally diagnosed lung lesions. However, there remains a lack of consensus on which congenital pulmonary airway malformation volume ratio values have the best predictive value because of operator dependence, inherent changes in lung lesion size throughout gestation, and the widespread use of maternal steroids. OBJECTIVE This study sought to determine the association between serial congenital pulmonary airway malformation volume ratio measurements and neonatal outcomes among fetuses with lung malformations. STUDY DESIGN This was a retrospective cohort study of fetuses with a prenatally diagnosed lung malformation managed at 2 major fetal centers from January 2010 to December 2021. Prenatal variables, including prospectively measured congenital pulmonary airway malformation volume ratio measurements (initial, maximum, and final), were analyzed. The results were correlated with 3 outcome measures, namely surgical resection before 30 days of life, a need for supplemental O2 at birth, and endotracheal intubation at birth. Statistical analyses were performed using receiver operating characteristic curve analyses, Welch 2 sample t tests, and multivariable logistic regressions (P<.05). RESULTS There were 123 fetuses with isolated lung lesions identified. Eight (6.5%) had hydrops. The mean initial congenital pulmonary airway malformation volume ratio was 0.67±0.61 cm2 at 22.9±3.9 weeks' gestation. The mean maximum congenital pulmonary airway malformation volume ratio was 1.08 ± 0.94 cm2 at 27.0 ± 4.0 weeks' gestation. The mean final congenital pulmonary airway malformation volume ratio was 0.58±0.60 cm2 at 33.2±4.1 weeks' gestation. At a mean gestational age at delivery of 38.3±2.6 weeks, 15 (12.2%) underwent neonatal lung resection for symptomatic disease. In a multivariable regression, all 3 congenital pulmonary airway malformation volume ratio measurements showed a significant correlation with neonatal lung resection (P<.001). Optimal congenital pulmonary airway malformation volume ratio cutoffs were established based on an initial congenital pulmonary airway malformation volume ratio of ≥0.8 cm2, maximum congenital pulmonary airway malformation volume ratio of ≥1.5 cm2, and a final congenital pulmonary airway malformation volume ratio of ≥1.3 cm2 with associated areas under the curve of 0.89, 0.97, and 0.93, respectively. The final congenital pulmonary airway malformation volume ratio had the highest specificity for predicting surgical lung resection in the early postnatal period. CONCLUSION Measuring congenital pulmonary airway malformation volume ratios throughout pregnancy in fetuses with pulmonary malformations has clinical value for prenatal counseling and planning care transition after delivery. Fetuses with a final congenital pulmonary airway malformation volume ratio of more than 1.3 cm2 are likely to require neonatal surgery and therefore should be delivered at tertiary care centers with a neonatal intensive care unit and pediatric surgical expertise.
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Affiliation(s)
- Annalise B Penikis
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD (Dr Penikis, Ms Zhou, and Drs Sferra and Kunisaki)
| | - Alice L Zhou
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD (Dr Penikis, Ms Zhou, and Drs Sferra and Kunisaki)
| | - Shelby R Sferra
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD (Dr Penikis, Ms Zhou, and Drs Sferra and Kunisaki)
| | - Abigail J Engwall-Gill
- Section of Pediatric Surgery, Department of Surgery, University of Michigan Medical School, Ann Arbor, MI (Dr Engwall-Gill)
| | - Jena L Miller
- Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD (Drs Miller, Baschat, and Blakemore)
| | - Ahmet A Baschat
- Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD (Drs Miller, Baschat, and Blakemore)
| | - Karin J Blakemore
- Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD (Drs Miller, Baschat, and Blakemore)
| | - Shaun M Kunisaki
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD (Dr Penikis, Ms Zhou, and Drs Sferra and Kunisaki).
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19
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Zhou AL, Wu X, Youm J, Heller MB, Lam A. Cost-Effectiveness of Drug-Coated Balloon Angioplasty versus Plain Old Balloon Angioplasty for Arteriovenous Fistula Stenosis. Cardiovasc Intervent Radiol 2023; 46:1221-1230. [PMID: 36977902 DOI: 10.1007/s00270-023-03403-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 02/23/2023] [Indexed: 03/30/2023]
Abstract
OBJECTIVE To compare the cost-effectiveness of drug-coated balloon angioplasty (DCB) versus plain old balloon angioplasty (POBA) for treatment of arteriovenous fistula (AVF) stenosis. METHODS A Markov model was created to compare DCB versus POBA for AVF stenosis over a 2-year time horizon from a United States payer's perspective. Probabilities related to complications, restenosis, retreatment, and all-cause mortality were obtained from published literature. Costs were calculated using Medicare reimbursement rates and data from published cost analyses, inflation-adjusted to 2021. Health outcomes were measured with quality-adjusted life years (QALY). Probabilistic and deterministic sensitivity analyses were performed with a willingness-to-pay threshold of $100,000/QALY. RESULTS Base case calculation showed better quality-of-life outcomes but increased cost with POBA compared to DCB, with an incremental cost-effectiveness ratio of $27,413/QALY, making POBA the more cost-effective strategy in the base case model. Sensitivity analyses showed that DCB becomes cost-effective if the 24-month mortality rate after DCB is no more than 3.4% higher than that after POBA. In secondary analyses where mortality rates were equalized, DCB was more cost-effective than POBA until its additional cost reached more than $4213 per intervention. CONCLUSION When modeled from a payer's perspective over 2 years, the cost utility of DCB versus POBA varies with mortality outcomes. POBA is cost-effective if 2-year all-cause mortality after DCB is greater than 3.4% higher than after POBA. If 2-year mortality after DCB is less than 3.4% higher than after POBA, DCB is cost-effective until its additional cost per procedure exceeds $4213 more than POBA. LEVEL OF EVIDENCE IV HISTORICALLY CONTROLLED STUDY.: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .
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Affiliation(s)
- Alice L Zhou
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA.
| | - Xiao Wu
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Jiwon Youm
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Michael B Heller
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
| | - Alexander Lam
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA
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20
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Yesantharao PS, Etchill EW, Zhou AL, Ong CS, Metkus TS, Canner JK, Alejo DE, Aliu O, Czarny MJ, Hasan RK, Resar JR, Schena S. The impact of a statewide payment reform on transcatheter aortic valve replacement (TAVR) utilization and readmissions. Catheter Cardiovasc Interv 2023; 101:1193-1202. [PMID: 37102376 DOI: 10.1002/ccd.30670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 02/07/2023] [Accepted: 04/15/2023] [Indexed: 04/28/2023]
Abstract
BACKGROUND Transcatheter aortic valve replacement (TAVR) is an increasingly used but relatively expensive procedure with substantial associated readmission rates. It is unknown how cost-constrictive payment reform measures, such as Maryland's All Payer Model, impact TAVR utilization given its relative expense. This study investigated the impact of Maryland's All Payer Model on TAVR utilization and readmissions among Maryland Medicare beneficiaries. METHODS This was a quasi-experimental investigation of Maryland Medicare patients undergoing TAVR between 2012 and 2018. New Jersey data were used for comparison. Longitudinal interrupted time series analyses were used to study TAVR utilization and difference-in-differences analyses were used to investigate post-TAVR readmissions. RESULTS During the first year of payment reform (2014), TAVR utilization among Maryland Medicare beneficiaries dropped by 8% (95% confidence interval [CI]: -9.2% to -7.1%; p < 0.001), with no concomitant change in TAVR utilization in New Jersey (0.2%, 95% CI: 0%-1%, p = 0.09). Longitudinally, however, the All Payer Model did not impact TAVR utilization in Maryland compared to New Jersey. Difference-in-differences analyses demonstrated that implementation of the All Payer Model was not associated with significantly greater declines in 30-day post-TAVR readmissions in Maryland versus New Jersey (-2.1%; 95% CI: -5.2% to 0.9%; p =0.1). CONCLUSIONS Maryland's All Payer Model resulted in an immediate decline in TAVR utilization, likely a result of hospitals adjusting to global budgeting. However, beyond this transition period, this cost-constrictive reform measure did not limit Maryland TAVR utilization. In addition, the All Payer Model did not reduce post-TAVR 30-day readmissions. These findings may help inform expansion of globally budgeted healthcare payment structures.
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Affiliation(s)
- Pooja S Yesantharao
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Eric W Etchill
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Alice L Zhou
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Chin Siang Ong
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
- Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Thomas S Metkus
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
- Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Joseph K Canner
- Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Diane E Alejo
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Oluseyi Aliu
- Department of Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Matthew J Czarny
- Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Rani K Hasan
- Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Jon R Resar
- Division of Cardiology, Johns Hopkins Hospital, Baltimore, Maryland, USA
| | - Stefano Schena
- Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland, USA
- Medical College of Wisconsin, Milwaukee, Wisconsin, 53226, USA
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21
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Engwall-Gill AJ, Zhou AL, Penikis AB, Sferra SR, Jelin AC, Blakemore KJ, Kunisaki SM. Prenatal Sonography in Suspected Proximal Gastrointestinal Obstructions: Diagnostic Accuracy and Neonatal Outcomes. J Pediatr Surg 2023; 58:1090-1094. [PMID: 36907770 PMCID: PMC10866136 DOI: 10.1016/j.jpedsurg.2023.02.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 02/10/2023] [Indexed: 02/19/2023]
Abstract
BACKGROUND The purpose of this study was to assess diagnostic accuracy and neonatal outcomes in fetuses with a suspected proximal gastrointestinal obstruction (GIO). METHODS After IRB approval, a retrospective chart review was conducted on prenatally suspected and/or postnatally confirmed cases of proximal GIO at a tertiary care facility (2012-2022). Maternal-fetal records were queried for presence of a double bubble ± polyhydramnios, and neonatal outcomes were assessed to calculate the diagnostic accuracy of fetal sonography. RESULTS Among 56 confirmed cases, the median birthweight and gestational age at birth were 2550 g [interquartile range (IQR) 2028-3012] and 37 weeks (IQR 34-38), respectively. There was one (2%) false-positive and three (6%) false-negatives by ultrasound. Double bubble had a sensitivity, specificity, positive predictive value, and negative predictive value for proximal GIO of 85%, 98%, 98%, and 83%, respectively. Pathologies included 49 (88%) with duodenal obstruction/annular pancreas, three (5%) with malrotation, and three (5%) with jejunal atresia. The median postoperative length of stay was 27 days (IQR 19-42). Cardiac anomalies were associated with significantly higher complications (45% vs 17%, p = 0.030). CONCLUSIONS In this contemporary series, fetal sonography has high diagnostic accuracy for detecting proximal gastrointestinal obstruction. These data are informative for pediatric surgeons in prenatal counseling and preoperative discussions with families. LEVEL OF EVIDENCE Diagnostic Study, Level III.
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Affiliation(s)
- Abigail J Engwall-Gill
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Alice L Zhou
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Annalise B Penikis
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Shelby R Sferra
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Angie C Jelin
- Division of Maternal-Fetal Medicine, Department of Gynecology & Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Karin J Blakemore
- Division of Maternal-Fetal Medicine, Department of Gynecology & Obstetrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Shaun M Kunisaki
- Division of General Pediatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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22
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Ruck JM, Zeiser LB, Zhou AL, Chidi AP, Winchester SL, Durand CM, Ha JS, Shah PD, Massie AB, Segev DL, Merlo CA, Bush EL. Trends in use and three-year outcomes of hepatitis C virus-viremic donor lung transplants for hepatitis C virus-seronegative recipients. J Thorac Cardiovasc Surg 2023; 165:1587-1595.e2. [PMID: 36207160 PMCID: PMC9989038 DOI: 10.1016/j.jtcvs.2022.08.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 08/18/2022] [Accepted: 08/18/2022] [Indexed: 11/21/2022]
Abstract
OBJECTIVE The feasibility and 6-month outcome safety of lung transplants (LTs) from hepatitis C virus (HCV)-viremic donors for HCV-seronegative recipients (R-) were established in 2019, but longer-term safety and uptake of this practice nationally remain unknown. METHODS We identified HCV-seronegative LT recipients (R-) 2015-2020 using the Scientific Registry of Transplant Recipients. We classified donors as seronegative (D-) or viremic (D+). We used χ2 testing, rank-sum testing, and Cox regression to compare posttransplant outcomes between HCV D+/R- and D-/R- LT recipients. RESULTS HCV D+/R- LT increased from 2 to 97/year; centers performing HCV D+/R- LT increased from 1 to 25. HCV D+/R- versus HCV D-/R- LT recipients had more obstructive disease (35.7% vs 23.3%, P < .001), lower lung allocation score (36.5 vs 41.1, P < .001), and longer waitlist time (P = .002). HCV D+/R- LT had similar risk of acute rejection (adjusted odds ratio [aOR], 0.87; P = .58), extracorporeal membranous oxygenation (aOR, 1.94; P = .10), and tracheostomy (aOR, 0.42; P = .16); similar median hospital stay (P = .07); and lower risk of ventilator > 48 hours (aOR, 0.68; P = .006). Adjusting for donor, recipient, and transplant characteristics, risk of all-cause graft failure and mortality were similar at 30 days, 1 year, and 3 years for HCV D+/R- versus HCV D-/R- LT (all P > .1), as well as for high- (≥20/year) versus low-volume LT centers and high- (≥5/year) versus low-volume HCV D+/R- LT centers (all P > .5). CONCLUSIONS HCV D+/R- and HCV D-/R- LT have similar outcomes at 3 years posttransplant. These results underscore the safety of HCV D+/R- LT and the potential benefit of expanding this practice further.
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Affiliation(s)
- Jessica M Ruck
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Laura B Zeiser
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alice L Zhou
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alexis P Chidi
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | | | - Christine M Durand
- Division of Infectious Disease, Deparment of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Jinny S Ha
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Pali D Shah
- Division of Pulmonology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Allan B Massie
- Department of Surgery, NYU Langone School of Medicine, New York, NY
| | - Dorry L Segev
- Department of Surgery, NYU Langone School of Medicine, New York, NY; Scientific Registry of Transplant Recipients, Minneapolis, Minn
| | - Christian A Merlo
- Division of Pulmonology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Errol L Bush
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md.
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23
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Ruck JM, Zhou AL, Zeiser LB, Alejo D, Durand CM, Massie AB, Segev DL, Bush EL, Kilic A. Trends and three-year outcomes of hepatitis C virus-viremic donor heart transplant for hepatitis C virus-seronegative recipients. JTCVS Open 2022; 12:269-279. [PMID: 36590744 PMCID: PMC9801334 DOI: 10.1016/j.xjon.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/17/2022] [Accepted: 10/24/2022] [Indexed: 11/06/2022]
Abstract
Objective Heart transplants (HTs) from hepatitis C virus (HCV)-viremic donors to HCV-seronegative recipients (HCV D+/R-) have good 6-month outcomes, but practice uptake and long-term outcomes overall and among candidates on mechanical circulatory support (MCS) have yet to be established. Methods Using the Scientific Registry of Transplant Recipients, we identified US adult HCV-seronegative HT recipients (R-) from 2015 to 2021. We classified donors as HCV-seronegative (D-) or HCV-viremic (D+). We used multivariable regression to compare post-HT extracorporeal membranous oxygenation, dialysis, pacemaker, acute rejection, and risk of post-HT mortality between HCV D+/R- and HCV D-/R-. Models were adjusted for donor, recipient, and transplant characteristics and center HT volume. We performed subgroup analyses of recipients bridged with MCS. Results From 2015 to 2021, the number of HCV D+/R- HT increased from 1 to 181 and the number of centers performing HCV D+/R- HT increased from 1 to 60. Compared with HCV D-/R- recipients, HCV D+/R- versus D-/R- recipients overall and among patients bridged with MCS had similar odds of post-HT extracorporeal membranous oxygenation, dialysis, pacemaker, and acute rejection; and mortality risk at 30 days, 1 year, and 3 years (all P > .05). High center HT volume but not HCV D+/R- volume (<5 vs >5 in any year) was associated with lower mortality for HCV D+/R- HT. Conclusions HCV D+/R- and D-/R- HT have similar outcomes at 3 years' posttransplant. These results underscore the opportunity provided by HCV D+/R- HT, including among the growing population bridged with MCS, and the potential benefit of further expanding use of HCV+ allografts.
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Key Words
- D+, HCV-viremic donor
- DAAs, direct-acting antivirals
- DCD, donation after circulatory death
- D–, HCV-seronegative donor
- ECMO, extracorporeal membranous oxygenation
- HCV, hepatitis C virus
- HT, heart transplant
- IABP, intra-aortic balloon pump
- IQR, interquartile range
- LVAD, left ventricular assist device
- MCS, mechanical circulatory support
- R–, HCV-seronegative recipient
- SRTR, Scientific Registry of Transplant Recipients
- aHR, adjusted hazard ratio
- aOR, adjusted odds ratio
- donor pool
- heart transplant
- hepatitis C
- outcomes
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Affiliation(s)
- Jessica M. Ruck
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Alice L. Zhou
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Laura B. Zeiser
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Diane Alejo
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Christine M. Durand
- Division of Infection Disease, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Allan B. Massie
- Division of Transplant Surgery, Department of Surgery, NYU Langone Health, New York, NY
| | - Dorry L. Segev
- Division of Transplant Surgery, Department of Surgery, NYU Langone Health, New York, NY,Scientific Registry of Transplant Recipients, Minneapolis, Minn
| | - Errol L. Bush
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md,Address for reprints: Ahmet Kilic, MD, Department of Surgery, Johns Hopkins Medical Institutions, Sheikh Zayed Tower, Suite 7107, 1800 Orleans St, Baltimore, MD 21287.
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24
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Zhou AL, Etchill EW, Shou BL, Whitbread JJ, Barbur I, Giuliano KA, Kilic A. Outcomes after heart transplantation in patients who have undergone a bridge-to-bridge strategy. JTCVS Open 2022; 12:255-268. [PMID: 36590736 PMCID: PMC9801290 DOI: 10.1016/j.xjon.2022.08.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 08/13/2022] [Accepted: 08/29/2022] [Indexed: 01/04/2023]
Abstract
Objectives We compared posttransplant outcomes between patients bridged from temporary mechanical circulatory support to durable left ventricular assist device before transplant (bridge-to-bridge [BTB] strategy) and patients bridged from temporary mechanical circulatory support directly to transplant (bridge-to-transplant [BTT] strategy). Methods We identified adult heart transplant recipients in the Organ Procurement and Transplantation Network database between 2005 and 2020 who were supported with extracorporeal membrane oxygenation, intra-aortic balloon pump, or temporary ventricular assist device as a BTB or BTT strategy. Kaplan-Meier survival analysis and Cox regressions were used to assess 1-year, 5-year, and 10-year survival. Posttransplant length of stay and complications were compared as secondary outcomes. Results In total, 201 extracorporeal membrane oxygenation (61 BTB, 140 BTT), 1385 intra-aortic balloon pump (460 BTB, 925 BTT), and 234 temporary ventricular assist device (75 BTB, 159 BTT) patients were identified. For patients supported with extracorporeal membrane oxygenation, intra-aortic balloon pump, or temporary ventricular assist device, there were no differences in survival between BTB and BTT at 1 and 5 years posttransplant, as well as 10 years posttransplant even after adjusting for baseline characteristics. The extracorporeal membrane oxygenation BTB group had greater rates of acute rejection (32.8% vs 13.6%; P = .002) and lower rates of dialysis (1.6% vs 21.4%; P < .001). For intra-aortic balloon pump and temporary ventricular assist device patients, there were no differences in posttransplant length of stay, acute rejection, airway compromise, stroke, dialysis, or pacemaker insertion between BTB and BTT recipients. Conclusions BTB patients have similar short- and midterm posttransplant survival as BTT patients. Future studies should continue to investigate the tradeoff between prolonged temporary mechanical circulatory support versus transitioning to durable mechanical circulatory support.
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Key Words
- BTB, bridge-to-bridge
- BTT, bridge-to-transplant
- CO, cardiac output
- ECMO, extracorporeal membrane oxygenation
- IABP, intra-aortic balloon pump
- LVAD, left ventricular assist device
- MCS, mechanical circulatory support
- OPTN, Organ Procurement and Transplantation Network
- PA, pulmonary artery
- PCWP, pulmonary capillary wedge pressure
- TAH, total artificial heart
- UNOS, United Network for Organ Sharing
- extracorporeal membrane oxygenation
- heart transplant
- intra-aortic balloon pump
- mPAP, mean pulmonary arterial pressure
- mechanical circulatory support
- tVAD, temporary ventricular assist device
- transplant outcomes
- ventricular assist devices
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Affiliation(s)
- Alice L. Zhou
- Johns Hopkins University School of Medicine, Baltimore, Md
| | - Eric W. Etchill
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | | | | | - Iulia Barbur
- Johns Hopkins University School of Medicine, Baltimore, Md
| | - Katherine A. Giuliano
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, Md
- Address for reprints: Ahmet Kilic, MD, Division of Cardiac Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Sheikh Zayed Tower, Suite 7107, 1800 Orleans St, Baltimore, MD 21287.
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25
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Shou BL, Halub ME, Zhou AL, Thompkins BA, Choi CW. Massive left atrial thrombus evades multimodality imaging as a myxoma in a bicaval heart transplant recipient. J Card Surg 2022; 37:2884-2887. [PMID: 35789119 DOI: 10.1111/jocs.16708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 06/07/2022] [Accepted: 06/13/2022] [Indexed: 11/30/2022]
Abstract
Intracardiac masses are an extremely rare and poorly described complication following a bicaval heart transplantation. We describe the case of an asymptomatic 62-year-old male with a large left atrial mass found incidentally on transthoracic echocardiography 6 years post-transplant. A battery of additional imaging tests was ordered including transesophageal echocardiography, 18 F-fluorodeoxyglucose positron emission tomography/computed tomography, and T1 and T2 magnetic resonance imaging. Although imaging biomarkers were generally nonspecific, the mass was most consistent with a cardiac myxoma. However, intraoperative findings confirmed by pathology revealed a massive organizing thrombus. The patient had an uneventful recovery after surgical removal of the mass. Our case highlights a very rare phenomenon in heart transplant recipients which remains a unique diagnostic challenge even with current advances in imaging.
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Affiliation(s)
- Benjamin L Shou
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Meghan E Halub
- Division of Cardiac Surgery, Mayo Clinic, Rochester, Minnesota, USA
| | - Alice L Zhou
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Bryon A Thompkins
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Chun W Choi
- Division of Cardiac Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Department of Cardiothoracic Surgery, Virtua Health, Virtua Our Lady of Lourdes Hospital, Camden, New Jersey, USA
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26
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Shou BL, Haloub ME, Zhou AL, Lawton JS. Caseous necrosis of the mitral annulus masquerading as an intracardiac mass. Glob Cardiol Sci Pract 2022; 2022:e202201. [PMID: 36339670 PMCID: PMC9629298 DOI: 10.21542/gcsp.2022.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Accepted: 04/14/2022] [Indexed: 11/16/2022] Open
Abstract
Caseous necrosis of the mitral annulus is a rare condition which typically involves the posterior leaflet or annulus. We report the case of a 71-year-old female with extensive comorbidities, presenting with dyspnea and angina, who had an incidental echocardiographic finding of a mass on or near the mitral valve. The mass increased in size over the course of three years and was associated with severe mitral regurgitation. The mass was initially thought to be a myxoma, however, surgical exploration revealed caseous necrosis of the posterior mitral annulus. Following removal of the necrotic tissue and distorted mitral leaflet, a bioprosthetic mitral valve was implanted and the patient recovered uneventfully.
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27
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Zhou AL, Halub ME, Lotfalla M, Shou BL, Kilic A. Pulmonary artery transection for resection of a middle mediastinal paraganglioma. Clin Case Rep 2022; 10:e05600. [PMID: 35425604 PMCID: PMC8991763 DOI: 10.1002/ccr3.5600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 02/17/2022] [Accepted: 03/07/2022] [Indexed: 11/25/2022] Open
Abstract
We report the case of a 65‐year‐old male patient who presented with chest pain and was found to have a mediastinal paraganglioma between the left atrium and main pulmonary artery. This is the first reported case of a mediastinal paraganglioma resection utilization transection of the main pulmonary artery.
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Affiliation(s)
- Alice L. Zhou
- Division of Cardiac Surgery Department of Surgery Johns Hopkins Hospital Baltimore Maryland USA
| | - Meghan E. Halub
- Division of Cardiac Surgery Department of Surgery Johns Hopkins Hospital Baltimore Maryland USA
| | - Mira Lotfalla
- Division of Surgical Pathology Department of Pathology Johns Hopkins Hospital Baltimore Maryland USA
| | - Benjamin L. Shou
- Division of Cardiac Surgery Department of Surgery Johns Hopkins Hospital Baltimore Maryland USA
| | - Ahmet Kilic
- Division of Cardiac Surgery Department of Surgery Johns Hopkins Hospital Baltimore Maryland USA
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28
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Zhou AL, Etchill EW, Giuliano KA, Shou BL, Sharma K, Choi CW, Kilic A. Bridge to transplantation from mechanical circulatory support: a narrative review. J Thorac Dis 2022; 13:6911-6923. [PMID: 35070375 PMCID: PMC8743412 DOI: 10.21037/jtd-21-832] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 08/25/2021] [Indexed: 12/12/2022]
Abstract
Objective To highlight recent developments in the utilization of mechanical circulatory support (MCS) devices as bridge-to-transplant strategies and to discuss trends in MCS use following the changes to the United Network for Organ Sharing (UNOS) heart allocation system. Background MCS devices have played an increasingly important role in the treatment of heart failure patients. Over the past several years, technological advancements have led to new developments in MCS devices and expanding indications for MCS use. In October of 2018, the UNOS heart allocation policy was revised to prioritize higher-urgency patients, including those supported with temporary MCS devices. Since then, changes in trends of MCS utilization have been observed. Methods Articles from the PubMed database regarding the use of MCS devices as bridge-to-transplant strategies were reviewed. Conclusions Over the past decade, utilization of temporary MCS devices, which include the intra-aortic balloon pump (IABP), percutaneous ventricular assist devices (pVADs), and extracorporeal membrane oxygenation (ECMO), has become increasingly common. Recent advancements in MCS include the development of pVADs that can fully unload the left ventricle (LV) as well as devices designed to provide right-sided support. Technological advancements in durable left ventricular assist devices (LVADs) have also led to improved outcomes both on the device and following heart transplantation. Following the 2018 UNOS heart allocation policy revision, the utilization of temporary MCS in advanced heart failure patients has further increased and the proportion of patients bridged directly from a temporary MCS device has exponentially risen. However, following the start of the COVID-19 pandemic, the trends have reversed, with a decrease in the percentage of patients bridged from a temporary MCS device. As long-term data following the allocation policy revision becomes available, future studies should investigate how trends in MCS use for patients with advanced heart failure continue to evolve.
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Affiliation(s)
- Alice L Zhou
- Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Eric W Etchill
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Katherine A Giuliano
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | | | - Kavita Sharma
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Chun W Choi
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
| | - Ahmet Kilic
- Division of Cardiac Surgery, Department of Surgery, Johns Hopkins Hospital, Baltimore, MD, USA
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29
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Zhou AL, Ward RE. Milk polar lipids modulate lipid metabolism, gut permeability, and systemic inflammation in high-fat-fed C57BL/6J ob/ob mice, a model of severe obesity. J Dairy Sci 2019; 102:4816-4831. [PMID: 30981495 DOI: 10.3168/jds.2018-15949] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 02/22/2019] [Indexed: 12/14/2022]
Abstract
Dynamic interactions between lipid metabolism, gut permeability, and systemic inflammation remain unclear in the context of obesity. Milk polar lipids, lipids derived from the milk fat globule membrane, could positively affect the aforementioned obesity-related endpoints. This study aimed to test the hypotheses that milk polar lipids will reduce gut permeability, systemic inflammation, and liver lipid levels, and differentially affect the hepatic expression of genes associated with fatty acid synthesis and cholesterol regulation in preexisting obesity. We fed 3 groups of C57BL/6J ob/ob mice (n = 6 per group) for 2 wk: (1) a modified AIN-93G diet (CO) with 34% fat by energy; (2) CO with milk gangliosides (GG) at 0.2 g/kg of diet; and (3) CO with milk phospholipids (PL) at 10 g/kg of diet. The GG and PL were provided as semi-purified concentrates and replaced 2.0% and 7.2% of dietary fat by energy. The GG and PL did not affect total food intake, weight gain, fasting glucose, or gut permeability. The PL decreased liver mass and the mesenteric fat depot compared with the CO. The GG increased tight junction protein occludin in colon mucosa compared with the CO. The GG and PL decreased tight junction protein zonula occludens-1 in jejunum mucosa compared with the CO. Plasma endotoxin increased during the study but was unaffected by the treatments. Compared with the CO and GG, the PL increased plasma sphingomyelin and plasma IL-6. The GG and PL differentially regulated genes associated with lipid metabolism in the liver compared with the CO. Regarding general effects on lipid metabolism, the GG and PL decreased lipid levels in the liver and the mesenteric depot, and increased lipid levels in the plasma. Diet consumption decreased significantly when the ob/ob mice were kept in metabolic cages, which were not big enough and resulted in unwanted animal deaths. Future studies may keep this in mind and use better metabolic equipment for ob/ob mice. In conclusion, dietary milk polar lipids may have limited beneficial effects on gut barrier integrity, systemic inflammation, and lipid metabolism in the context of severe obesity.
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Affiliation(s)
- A L Zhou
- Nutrition, Dietetics and Food Sciences, Utah State University, 8700 Old Main Hill, Logan 84322
| | - R E Ward
- Nutrition, Dietetics and Food Sciences, Utah State University, 8700 Old Main Hill, Logan 84322.
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30
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Zhou AL, Bonham LW, Verde F. Comparative Analysis of Body Radiologist to Neuroradiologist Evaluation of the Spine in Trauma Settings. J Am Coll Radiol 2018; 15:1687-1691. [DOI: 10.1016/j.jacr.2018.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/22/2018] [Accepted: 03/02/2018] [Indexed: 01/01/2023]
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31
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Hansen-Smith F, Egginton S, Zhou AL, Hudlicka O. Growth of arterioles precedes that of capillaries in stretch-induced angiogenesis in skeletal muscle. Microvasc Res 2001; 62:1-14. [PMID: 11421656 DOI: 10.1006/mvre.2001.2308] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Arteriolar growth accompanying capillary angiogenesis has been linked with hemodynamic factors resulting from increased blood flow. Here we describe the growth of arterioles occurring in rat skeletal muscles stretched by an overload due to the removal of agonist muscles, where blood flow was not increased, and we provide morphological evidence for the type of cells involved in this growth. Rat extensor digitorum longus (EDL) and extensor hallucis proprius (EHP) were overloaded by unilateral extirpation of their agonist, tibialis anterior. EDL muscles were taken for immunohistochemistry in cryostat sections to mark endothelial cells (Griffonia simplicifolia I, GSI lectin), smooth muscle cells and pericytes (alpha smooth muscle actin, alphaSMA), and "mature" arterioles (smooth muscle myosin heavy chains). EHP muscles were used for corresponding evaluation by confocal and electron microscopy. The number of capillaries surrounding muscle fibers was not significantly different after 1 week of stretch but was higher after 2 weeks (5.15 +/- 0.2 vs 4.3 +/- 0.2 in controls, P < 0.05). Similarly, capillary density (CD) and capillary/fiber ratio (C/F) gradually increased (CD 778 +/- 86 at 2 weeks vs 593 +/- 35 mm(-2) in controls, C/F 2.07 +/- 0.13 vs 1.38 +/- 0.06, respectively). In contrast, the number of alphaSMA-positive vessels around fibers increased after 1 week (2.16 +/- 0.09 vs 0.25 +/- 0.02 in controls) and was lower after 2 weeks (1.42 +/- 0.24, P < 0.05, vs 1 week). Arteriolar density was higher at 1 (110.9 +/- 7.5 mm(-2)) and 2 weeks (70.7 +/- 12.1) with respect to controls (31.0 +/- 1.6 mm(-2)). The increased density was greater in alphaSMA-positive vessels <10 microm in diameter (controls 18.0 +/- 1.04, 1 week 77.2 +/- 4.5, 2 wk 42.2 +/- 9.0 mm(-2)) than in vessels >10 microm (13.0 +/- 0.8, 33.7 +/- 4.0, 29.5 +/- 4.7 mm(-2)). Electron microscopy showed "activated" (TEM fine structure) and proliferating (immunogold labeling for BrdU) fibroblasts in the vicinity of capillaries, some of which were embedded in the capillary basement membrane, consistent with a transformation into pericytes and possibly later smooth muscle cells. Confocal microscopy indicated that some mesenchymal cells became GSI positive and formed extended processes which contacted capillaries via tapered endings. Growth of arterioles in stretched muscles appears to involve proliferation of fibroblasts, which may migrate toward capillaries and precedes any apparent increase in capillarization.
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Affiliation(s)
- F Hansen-Smith
- Department of Biological Sciences and Center for Biomedical Research, Oakland University, Rochester, Michigan 48309-4401, USA
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Abstract
In order to evaluate the interaction between endothelial cells and the perivascular pericytes during physiological angiogenesis, stereological analysis of fine structure was performed on samples of rat skeletal muscle where capillary growth was induced to a similar extent by three different interventions (indirect electrical stimulation, vasodilatation by alpha 1-blockade, stretch due to synergist extirpation). There was a significant reduction in the relative area of contact between pericytes and the capillary abluminal surface with stimulation, and withdrawal of pericyte processes coincided with an increase in anatomical capillary supply. These data indicate that pericytes may play an anti-angiogenic role in vivo in normal adult tissue similar to that proposed for in vitro models of angiogenesis, with their retraction during increased muscle activity possibly releasing endothelial cells from their contact inhibition. However, following long-term peripheral vasodilatation expansion of the capillary bed was accompanied by a co-ordinated increase in pericytes, such that coverage of capillaries was similar to that in control muscles. In addition, growth of capillaries following prolonged stretch resulted in a slightly greater increase in the pericyte population, suggesting they may be permissive for endothelial cell migration. Thus, the role of pericytes in controlling physiological angiogenesis is dependent on the nature of the initial stimulus, suggesting that in vitro data have to be interpreted with caution when discussing the mechanism of capillary growth in vivo.
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Affiliation(s)
- S Egginton
- Department of Physicology, University of Birmingham, UK
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Abstract
OBJECTIVE The morphological pattern of angiogenesis occurring in mature, differentiated skeletal muscle in response to chronically increased muscle blood flow, muscle stretch or repetitious muscle contractions was examined to determine (a) whether capillary neoformation follows the generally accepted temporal paradigm, and (b) how the growth pattern is influenced by mechanical stimuli. METHODS Adult rats were treated for a maximum of 14 days either with the vasodilator prazosin, to elevate skeletal muscle blood flow, or underwent surgical removal of one ankle flexor, to induce compensatory overload in the remaining muscles, or had muscles chronically stimulated by implanted electrodes. Extensor digitorum longus and/or extensor hallucis proprius muscles were removed at intervals and processed for electron microscopy. A systematic examination of capillaries and their ultrastructure characterised the sequence of morphological changes indicative of angiogenesis, i.e., basement membrane disruption, endothelial cell (EC) sprouting and proliferation [immunogold labelling after bromodeoxyuridine (BrdU) incorporation]. RESULTS Capillary growth in response to increased blood flow occurred by luminal division without sprouting or basement membrane (BM) breakage. In stretched muscles, EC proliferation and abluminal sprouting gave rise to new capillaries, with BM loss only at sprout tips. These distinct mechanisms appear to be additive as in chronically stimulated muscles (increased blood flow with repetitive stretch and shortening during muscle contractions) both forms of capillary growth occurred. Endothelial cell numbers per capillary profile, mitotic EC nuclei, and BrdU labelling confirmed cell proliferation prior to overt angiogenesis. CONCLUSIONS Physiological angiogenesis within adult skeletal muscle progresses by mechanisms that do not readily conform to the consensus view of capillary growth, derived mainly from observations made during development, pathological vessel growth, or from in vitro systems. The temporal and spatial pattern of growth is determined by the polarity of the mechanical stimulus, i.e., by intra-luminal (increased shear stress) or abluminal (external stretch) stimuli.
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Affiliation(s)
- S Egginton
- Angiogenesis Research Group, Department of Physiology, The Medical School, University of Birmingham, B15 2TT, Birmingham, UK.
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Haas TL, Milkiewicz M, Davis SJ, Zhou AL, Egginton S, Brown MD, Madri JA, Hudlicka O. Matrix metalloproteinase activity is required for activity-induced angiogenesis in rat skeletal muscle. Am J Physiol Heart Circ Physiol 2000; 279:H1540-7. [PMID: 11009439 DOI: 10.1152/ajpheart.2000.279.4.h1540] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Proteolysis of the capillary basement membrane is a hallmark of inflammation-mediated angiogenesis, but it is undetermined whether proteolysis plays a critical role in the process of activity-induced angiogenesis. Matrix metalloproteinases (MMPs) constitute the major class of proteases responsible for degradation of basement membrane proteins. We observed significant elevations of mRNA and protein levels of both MMP-2 and membrane type 1 (MT1)-MMP (2.9 +/- 0.7- and 1.5 +/- 0.1-fold above control, respectively) after 3 days of chronic electrical stimulation of rat skeletal muscle. Inhibition of MMP activity via the inhibitor GM-6001 prevented the growth of new capillaries as assessed by the capillary-to-fiber ratio (1.34 +/- 0.08 in GM-6001-treated muscles compared with 1.69 +/- 0.03 in control 7-day-stimulated muscles). This inhibition correlated with a significant reduction in the number of capillaries with observable breaks in the basement membrane, as assessed by electron microscopy (0.27 +/- 0.27% in GM-6001-treated muscles compared with 3.72 +/- 0.65% in control stimulated muscles). Proliferation of capillary-associated cells was significantly elevated by 2 days and remained elevated throughout 14 days of stimulation. Capillary-associated cell proliferation during muscle stimulation was not affected by MMP inhibition (80.3 +/- 9.3 nuclei in control and 63.5 +/- 8.5 nuclei in GM-6001-treated animals). We conclude that MMP proteolysis of capillary basement membrane proteins is a critical component of physiological angiogenesis, and we postulate that capillary-associated proliferation precedes and occurs independently of endothelial cell sprout formation.
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Affiliation(s)
- T L Haas
- Department of Pathology, Yale University, New Haven, Connecticut 06515, USA.
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35
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Abstract
We examined the early stages of angiogenesis in overloaded m. extensor digitorum longus following extirpation of the agonist m. tibialis anterior. Capillary-to-fibre ratio increased after 1 week (1.54+/-0.02) vs. control (1.38+/0.06; P < 0.01) and resulted in a greater tortuosity of the capillary bed at 2 weeks, indicating the presence of lateral sprouts or anastomoses. Capillary endothelial cells (ECs) showed ultrastructural signs of activation, were thickened, and had irregular luminal and abluminal surfaces. The proportion of ECs with abluminal processes increased after overload (13.5+/-0.6% vs. 2.0+/-1.5%, 1 week vs. contralateral, P < 0.01; 12.5+/-2.6% vs. 3.5+/-0.6%, 2 weeks vs. contralateral, P < 0.01), whereas there was no significant change in proportion of luminal processes. Abluminal processes occurred in approximately 13% of capillaries in overloaded muscles (P < 0.01 v. control and contralateral), and most were associated with focal breakage of the basement membrane (BM). Small sprouts (<3 microm in diameter) comprised of one or two ECs sometimes lacked a lumen, and others had a slitlike or vacuolelike lumen between adjacent ECs or vacuolelike lumen formed by fusion of vesicles within a single EC. Endothelial mitosis was occasionally seen in nonsprouting capillaries with intact BM, increasing the average number of ECs per capillary from approximately 1.7 in control muscles to 2.1 after 1 week of overload (P < 0.05) when bromodeoxyuridine incorporation was also higher (P < 0.001). We conclude that muscle overload induces capillary growth by sprouting of existing capillaries, probably due to mechanical stretch acting from the abluminal side of the vessels.
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MESH Headings
- Animals
- Basement Membrane/cytology
- Basement Membrane/ultrastructure
- Capillaries/physiology
- Capillaries/ultrastructure
- Cell Division/physiology
- Endothelium, Vascular/cytology
- Endothelium, Vascular/ultrastructure
- Male
- Microscopy, Electron
- Muscle Contraction/physiology
- Muscle Fibers, Skeletal/cytology
- Muscle Fibers, Skeletal/physiology
- Muscle Fibers, Skeletal/ultrastructure
- Muscle, Skeletal/blood supply
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiology
- Neovascularization, Physiologic/physiology
- Rats
- Rats, Wistar
- S Phase/physiology
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Affiliation(s)
- A L Zhou
- Department of Physiology, University of Birmingham, United Kingdom
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Brown MD, Egginton S, Hudlicka O, Zhou AL. Appearance of the capillary endothelial glycocalyx in chronically stimulated rat skeletal muscles in relation to angiogenesis. Exp Physiol 1996; 81:1043-6. [PMID: 8960710 DOI: 10.1113/expphysiol.1996.sp003989] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The endothelial glycocalyx layer of capillaries was stained with Ruthenium Red and examined by transmission electron microscopy in rat extensor hallucis proprius muscles after 2 or 4 days of indirect electrical stimulation via implanted electrodes. The layer appeared continuous on the luminal surface of 63% capillaries in control muscles and absent 13%. This situation was reversed in muscles stimulated for 2 or 4 days, with a continuous layer in 12 and 10% of capillaries and no glycocalyx in 44 and 58%, respectively. The greater disruption of the endothelial luminal glycocalyx in capillaries from stimulated muscles suggests that flow-related shear forces on endothelial cells could be important signals for initiation of angiogenesis in actively contracting skeletal muscle.
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Affiliation(s)
- M D Brown
- School of Sport and Exercise Sciences, University of Birmingham, UK
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Kirk J, Zhou AL. Viral infection at the blood-brain barrier in multiple sclerosis:--an ultrastructural study of tissues from a UK Regional Brain Bank. Mult Scler 1996; 1:242-52. [PMID: 9345442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Although viral infections are often invoked as environmental factors in the aetiology and pathogenesis of multiple sclerosis (MS) it is only recently that a specific, indirect, cytokine-mediated mechanism for triggering of relapses during viral infections has been demonstrated. It is not yet clear however whether this indirect mechanism can account for all reported viral associations with the aetiopathogenesis of MS. A direct causal role of central nervous system (CNS) viral infection in MS has largely been discounted following repeated failures to demonstrate virus within the oligodendrocyte-myelin unit. In the light of increasing evidence of blood-brain barrier (BBB) dysfunction in MS and to further explore the issue of possible viral involvement in MS, an ultrastructural search for viruses was undertaken in the CNS microvasculature, in autopsy and biopsy tissue from human CNS primary demyelinating diseases, including MS (20 cases), idiopathic monophasic CNS demyelinating disease (Mdemy, four cases) and metabolic or immunopathological demyelinating disease (two cases). For comparison, tissues from CNS viral disease in which demyelination is a major feature (nine cases) were examined in the same way. Control CNS tissues (nine cases) from a range of other neurological and non-neurological diseases were also examined. Outside the MS and Mdemy groups, morphological evidence of virus associations with the BBB were found only in the acute and subacute viral encephalitides (three cases subacute sclerosing panencephalitis, one case of Herpes encephalitis) and in one case of disseminated Cytomegalovirus infection. In a small proportion of MS and Mdemy cases, particles resembling either adenovirus (one case of MS) or paramyxovirus (one case of MS, one case of Mdemy) were found in the vicinity of microvessels. In each case a different cell type or extracellular compartment was involved and an exact correlation between the virus particles and the demyelinating lesions could not be demonstrated. Furthermore, corroborative clinical or laboratory evidence of current CNS infection in these primary demyelinating disease cases was available only from the single positive Mdemy case and not from the two cases of MS. This and other previously published evidence from MS (which implicated a Coronavirus) and other diseases highlights the potential vulnerability to viral infection of cells associated with the BBB. Furthermore it is concluded that the detection rate of such infections in pathological tissue could underestimate their true frequency. A possible role of transient virus-BBB interactions in triggering focal inflammation, BBB breakdown and demyelination in some cases of MS and parainfectious demyelinating disease cannot be discounted.
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Affiliation(s)
- J Kirk
- Queens University School of Clinical Medicine (Neuropathology), Institute of Pathology, Belfast, UK
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McQuaid S, Kirk J, Zhou AL, Allen IV. Measles virus infection of cells in perivascular infiltrates in the brain in subacute sclerosing panencephalitis: confirmation by non-radioactive in situ hybridization, immunocytochemistry and electron microscopy. Acta Neuropathol 1993; 85:154-8. [PMID: 8442407 DOI: 10.1007/bf00227762] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
As part of continuing multidisciplinary studies on the neuropathogenesis of subacute sclerosing panencephalitis (SSPE), in situ hybridisation, immunocytochemistry and electron microscopy were used to detect measles virus nucleic acid, protein and nucleocapsids in brain perivascular infiltrates of three cases. Perivascular cuffing cells which contained measles virus nucleic acid and antigens were found in all cases. Infected cuffs occurred predominantly in areas of general parenchymal cell infection and in many of these a high proportion of the infiltrating cells were infected. Other cuffs in these areas were either uninfected or contained only a few infected cells. Occasional infected cells were also seen in cuffs in non-infected areas. In contrast, no specific immunocytochemical reactions or in situ hybridisation for measles virus was observed in brain tissue from a patient with herpes encephalitis. By electron microscopy viral nucleocapsid, consistent with measles virus, was found within the cytoplasm of plasma cells in the inflammatory cuffs in SSPE brain tissue. Possible explanations for our results are that infiltrates become infected on arrival in the CNS or alternatively, that the infected infiltrates reflect a generalised infection of the reticuloendothelial system. The frequent presence of uninfected cuffs favours the former explanation.
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Kirk J, Zhou AL, McQuaid S, Cosby SL, Allen IV. Cerebral endothelial cell infection by measles virus in subacute sclerosing panencephalitis: ultrastructural and in situ hybridization evidence. Neuropathol Appl Neurobiol 1991; 17:289-97. [PMID: 1944804 DOI: 10.1111/j.1365-2990.1991.tb00726.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Infection of vascular endothelium plays a central role in the pathogenesis of acute measles virus infection outside the central nervous system (CNS) but has not been described in the human CNS. An ultrastructural survey was made of blood vessels in five cases of subacute sclerosing panencephalitis (SSPE) to determine whether or not infection of cerebral vascular endothelium occurred in this persistent fatal CNS disease caused by measles virus. Morbillivirus nucleocapsids were found in a few endothelial cells in three necropsy cases but not in the limited tissue available from two biopsies. In a severe parenchymal lesion in one necropsied case, endothelial cells hybridized in situ with a biotinylated probe specific for the N genomic RNA of measles virus. It is concluded that human cerebral endothelium is susceptible to measles virus infection.
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Affiliation(s)
- J Kirk
- Multiple Sclerosis Research Laboratory, Queen's University of Belfast
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Zhou AL. [Treatment of fetal asphyxia with crystalline urea-hydrogen peroxide]. Zhonghua Hu Li Za Zhi 1986; 21:388-9, 410. [PMID: 3643066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Zhou AL. [Relation between postpartum bleeding and abortion]. Zhonghua Hu Li Za Zhi 1985; 20:13-5. [PMID: 3873293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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