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Ambardekar AP, Furukawa L, Eriksen W, McNaull PP, Greeley WJ, Lockman JL. A Consensus-Driven Revision of the Accreditation Council for Graduate Medical Education Case Log System: Pediatric Anesthesiology Fellowship Education. Anesth Analg 2023; 136:446-454. [PMID: 35773224 DOI: 10.1213/ane.0000000000006129] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Clinical experiences, quantified by case logs, are an integral part of pediatric anesthesiology fellowship programs. Accreditation of pediatric anesthesiology fellowships by the Accreditation Council of Graduate Medical Education (ACGME) and establishment of case log reporting occurred in 1997 and 2009, respectively. The specialty has evolved since then, but the case log system remains largely unchanged. The Pediatric Anesthesiology Program Directors Association (PAPDA) embarked on the development of an evidence-based case log proposal through the efforts of a case log task force (CLTF). This proposal was part of a larger consensus-building process of the Society for Pediatric Anesthesia (SPA) Task Force for Pediatric Anesthesiology Graduate Medical Education. The primary aim of case log revision was to propose an evidence-based, consensus-driven update to the pediatric anesthesiology case log system. METHODS This study was executed in 2 phases. The CLTF, composed of 10 program directors representing diverse pediatric anesthesiology fellowship programs across the country, utilized evidence-based literature to develop proposed new categories. After an approval vote by PAPDA membership, this proposal was included in the nationally representative, stakeholder-based Delphi process executed by the SPA Task Force on Graduate Medical Education. Thirty-seven participants engaged in this Delphi process, during which iterative rounds of surveys were used to select elements of the old and newly proposed case logs to create a final revision of categories and minimums for updated case logs. The Delphi methodology was used, with a two-thirds agreement as the threshold for inclusion. RESULTS Participation in the Delphi process was robust, and consensus was almost completely achieved by round 2 of 3 survey rounds. Participants suggested that total case minimums should increase from 240 to 300 (300-370). Participants agreed (75.86%) that the current case logs targeted the right types of cases, but requirements were too low (82.75%). They also agreed (85.19%) that the case log system and minimums deserved an update, and that this should be used as part of a competency-based assessment in pediatric anesthesia fellowships (96%). Participants supported new categories and provided recommended minimum numbers. CONCLUSIONS The pediatric anesthesiology case log system continues to have a place in the assessment of fellowship programs, but it requires an update. This Delphi process established broad support for new categories and benchmarked minimums to ensure the robustness of fellowship programs and to better prepare the pediatric anesthesiology workforce of the future for independent clinical practice.
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Affiliation(s)
- Aditee P Ambardekar
- From the Department of Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Dallas, Texas.,Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, California
| | - Louise Furukawa
- From the Department of Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Dallas, Texas.,Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, Stanford, California
| | - Whitney Eriksen
- Mixed Methods Research Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Peggy P McNaull
- Department of Anesthesiology, University of Virginia, Charlottesville, Virginia
| | - William J Greeley
- Departments of Anesthesiology and Pediatrics, Duke University School of Medicine, Durham, North Carolina
| | - Justin L Lockman
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.,Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennyslvania, Philadelphia, Pennsylvania
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Ambardekar AP, Eriksen W, Ferschl MB, McNaull PP, Cohen IT, Greeley WJ, Lockman JL. A Consensus-Driven Approach to Redesigning Graduate Medical Education: The Pediatric Anesthesiology Delphi Study. Anesth Analg 2023; 136:437-445. [PMID: 35777829 DOI: 10.1213/ane.0000000000006128] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Pediatric anesthesiology fellowship education has necessarily evolved since Accreditation Council for Graduate Medical Education (ACGME) accreditation in 1997. Advancements in perioperative and surgical practices, emerging roles in leadership, increasing mandates by accreditation and certification bodies, and progression toward competency-based education-among other things-have created pressure to enrich the current pediatric anesthesiology training system. The Society for Pediatric Anesthesia (SPA) formed a Task Force for Pediatric Anesthesiology Graduate Medical Education that included key leaders and subject matter experts from the society. A key element of the Task Force's charge was to identify curricular and evaluative enhancements for the fellowship program of the future. METHODS The Task Force executed a nationally representative, stakeholder-based Delphi process centered around a fundamental theme: "What makes a pediatric anesthesiologist?" to build consensus among a demographically varied and broad group of anesthesiologists within the pediatric anesthesiology community. A total of 37 demographically and geographically varied pediatric anesthesiologists participated in iterative rounds of open- and close-ended survey work between August 2020 and July 2021 to build consensus on the current state, known deficiencies, anticipated needs, and strategies for enhancing national educational offerings and program requirements. RESULTS Participation was robust, and consensus was almost completely achieved by round 2. This work generated a compelling Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis that suggests more strengths and opportunities in the current Pediatric Anesthesiology Graduate Medical Education program than weaknesses or threats. Stakeholders agreed that while fellows matriculate with some clinical knowledge and procedural gaps, a few clinical gaps exist upon graduation. Stakeholders agreed on 8 nonclinical domains and specific fundamental and foundational knowledge or skills that should be taught to all pediatric anesthesiology fellows regardless of career plans. These domains include (1) patient safety, (2) quality improvement, (3) communication skills, (4) supervision skills, (5) leadership, (6) medical education, (7) research basics, and (8) practice management. They also agreed that a new case log system should be created to better reflect modern pediatric anesthesia practice. Stakeholders further identified the need for the development of standardized and validated formative and summative assessment tools as part of a competency-based system. Finally, stakeholders noted that significant departmental, institutional, and national organizational support will be necessary to implement the specific recommendations. CONCLUSIONS A Delphi process achieved robust consensus in assessing current training and recommending future directions for pediatric anesthesiology graduate medical education.
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Affiliation(s)
- Aditee P Ambardekar
- From the Department of Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Whitney Eriksen
- Mixed Methods Research Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Marla B Ferschl
- Department of Anesthesia and Perioperative Care, University of California San Francisco, San Francisco, California
| | - Peggy P McNaull
- Department of Anesthesiology, University of Virginia, Charlottesville, Virginia
| | - Ira T Cohen
- Division of Anesthesiology and Pain Medicine, Department of Anesthesiology and Critical Care Medicine, Children's National, Washington, DC
| | - William J Greeley
- Departments of Anesthesiology and Pediatrics, Duke University School of Medicine, Durham, North Carolina
| | - Justin L Lockman
- Department of Anesthesiology and Critical Care, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.,Department of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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DeRusso PA, Greeley WJ, St Geme JW. Leading from the Middle: Benefits of a Physician Leadership Program. J Pediatr 2020; 219:4-6.e1. [PMID: 32204805 DOI: 10.1016/j.jpeds.2019.12.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 11/19/2022]
Affiliation(s)
- Patricia A DeRusso
- Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
| | - William J Greeley
- Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
| | - Joseph W St Geme
- Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania.
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Silber JH, Rosenbaum PR, Calhoun SR, Reiter JG, Hill AS, Even-Shoshan O, Greeley WJ. Outcomes, ICU Use, and Length of Stay in Chronically Ill Black and White Children on Medicaid and Hospitalized for Surgery. J Am Coll Surg 2017; 224:805-814. [PMID: 28167226 DOI: 10.1016/j.jamcollsurg.2017.01.053] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 01/23/2017] [Accepted: 01/24/2017] [Indexed: 11/26/2022]
Abstract
BACKGROUND With increasing Medicaid coverage, it has become especially important to determine whether racial differences exist within the Medicaid system. We asked whether disparities exist in hospital practice and patient outcomes between matched black and white Medicaid children with chronic conditions undergoing surgery. STUDY DESIGN We conducted a matched cohort study, matching 6,398 pairs within states on detailed patient characteristics using data from 25 states contributing adequate Medicaid Analytic eXtract claims for admissions of children with chronic conditions undergoing the same surgical procedures between January 1, 2009 and November 30, 2010 for ages 1 to 18 years. RESULTS The black patient 30-day revisit rate was 19.3% vs 19.8% in matched white patients (p = 0.61), 30-day readmission rates were 7.0% vs 6.9% (p = 0.43), and 30-day mortality rates were 0.38% vs 0.19% (p = 0.06), respectively. A higher percentage of black patients exceeded their own state's individual median length of stay (44.0% vs 39.6%; p < 0.001) and median ICU length of stay (25.9% vs 23.8%; p < 0.001). Intensive care unit use was higher in black patients (25.9% vs 23.8%; p < 0.001). After adjusting for multiple testing, only 2 states were found to differ significantly by race (New York for length of stay and New Jersey for ICU use). CONCLUSIONS We did not observe disparities in 30-day revisits and readmissions for chronically ill children in Medicaid undergoing surgery, and only slight differences in length of stay, ICU length of stay, and use of the ICU, where blacks displayed somewhat elevated rates compared with white controls.
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Affiliation(s)
- Jeffrey H Silber
- Center for Outcomes Research, The Children's Hospital of Philadelphia, Philadelphia, PA; Department of Pediatrics, The University of Pennsylvania School of Medicine, Philadelphia, PA; Department of Anesthesiology and Critical Care, The University of Pennsylvania School of Medicine, Philadelphia, PA; Department of Health Care Management, The Wharton School, The University of Pennsylvania, Philadelphia, PA; The Leonard Davis Institute of Health Economics, The University of Pennsylvania, Philadelphia, PA.
| | - Paul R Rosenbaum
- Department of Statistics, The Wharton School, The University of Pennsylvania, Philadelphia, PA; The Leonard Davis Institute of Health Economics, The University of Pennsylvania, Philadelphia, PA
| | - Shawna R Calhoun
- Center for Outcomes Research, The Children's Hospital of Philadelphia, Philadelphia, PA
| | - Joseph G Reiter
- Center for Outcomes Research, The Children's Hospital of Philadelphia, Philadelphia, PA
| | - Alexander S Hill
- Center for Outcomes Research, The Children's Hospital of Philadelphia, Philadelphia, PA
| | - Orit Even-Shoshan
- Center for Outcomes Research, The Children's Hospital of Philadelphia, Philadelphia, PA
| | - William J Greeley
- Department of Anesthesiology and Critical Care, The University of Pennsylvania School of Medicine, Philadelphia, PA
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Adler AC, Greeley WJ, Conlin F, Feldman JM. Reply to Letter from Dr. Boublik. J Cardiothorac Vasc Anesth 2016; 30:e53. [PMID: 27543997 DOI: 10.1053/j.jvca.2016.05.001] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Adam C Adler
- The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA
| | - William J Greeley
- The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Frederick Conlin
- The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Jeffrey M Feldman
- The Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, PA
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Adler AC, Greeley WJ, Conlin F, Feldman JM. Perioperative Anesthesiology UltraSonographic Evaluation (PAUSE): A Guided Approach to Perioperative Bedside Ultrasound. J Cardiothorac Vasc Anesth 2015; 30:521-9. [PMID: 27013122 DOI: 10.1053/j.jvca.2015.11.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Indexed: 01/29/2023]
Affiliation(s)
- Adam C Adler
- Department of Anesthesiology and Critical Care Medicine, Division of Cardiothoracic Anesthesiology; The Children's Hospital of Philadelphia, Philadelphia, PA.
| | - William J Greeley
- Department of Anesthesiology and Critical Care Medicine, Division of Cardiothoracic Anesthesiology; The Children's Hospital of Philadelphia, Philadelphia, PA; The University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Frederick Conlin
- Department of Anesthesiology, Baystate Medical Center, Springfield, MA; Tufts University School of Medicine, Boston, MA
| | - Jeffrey M Feldman
- Department of Anesthesiology and Critical Care Medicine, Division of Cardiothoracic Anesthesiology; The Children's Hospital of Philadelphia, Philadelphia, PA; The University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
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Kilbaugh TJ, Himebauch AS, Zaoutis T, Jobes D, Greeley WJ, Nicolson SC, Zuppa AF. A pilot and feasibility study of the plasma and tissue pharmacokinetics of cefazolin in an immature porcine model of pediatric cardiac surgery. Paediatr Anaesth 2015; 25:1111-9. [PMID: 26372607 DOI: 10.1111/pan.12756] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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] [Accepted: 07/31/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND Surgical site infection (SSI) prevention for children with congenital heart disease is imperative and methods to assess and evaluate the tissue concentrations of prophylactic antibiotics are important to help maximize these efforts. AIM The purposes of this study were to determine the plasma and tissue concentrations with standard of care, perioperative cefazolin dosing in an immature porcine model of pediatric cardiac surgery, and to determine the feasibility of this model. METHODS Piglets (3-5 days old) underwent either median sternotomy (MS) or cardiopulmonary bypass with deep hypothermic circulatory arrest (CPB + DHCA) and received standard of care prophylactic cefazolin for the procedures. Serial plasma and microdialysis sampling of the skeletal muscle and subcutaneous tissue adjacent to the surgical site was performed. Cefazolin concentrations were measured, noncompartmental pharmacokinetic analyses were performed, and tissue penetration of cefazolin was assessed. RESULTS Following the first intravenous dose, maximal cefazolin concentrations in the subcutaneous tissue and skeletal muscle were similar between groups with peak tissue concentrations 15-30 min after administration. After the second cefazolin dose given with the initiation of CPB, total plasma cefazolin concentrations remained relatively constant until the end of DHCA and then decreased while muscle- and subcutaneous-unbound cefazolin concentrations showed a second peak during or after rewarming. For the MS group, 60-67% of the intraoperative time showed subcutaneous and skeletal muscle concentrations of cefazolin >16 μg·ml(-1) while this percentage was 78-79% for the CPB + DHCA group. There was less tissue penetration of cefazolin in the group that underwent CBP + DHCA (P = 0.03). CONCLUSIONS The cefazolin dosing used in this study achieves plasma and tissue concentrations that should be effective against methicillin-sensitive Staphylococcus aureus but may not be effective against some gram-negative pathogens. The timing of the cefazolin administration prior to incision and a second dose given during cardiopulmonary bypass may be important factors for achieving goal tissue concentrations.
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Affiliation(s)
- Todd J Kilbaugh
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - Adam S Himebauch
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA.,Center for Clinical Pharmacology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Theoklis Zaoutis
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Infectious Diseases, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - David Jobes
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - William J Greeley
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - Susan C Nicolson
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA
| | - Athena F Zuppa
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia and The Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA, USA.,Center for Clinical Pharmacology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
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Pastuszko P, Schears GJ, Greeley WJ, Kubin J, Wilson DF, Pastuszko A. Granulocyte colony stimulating factor reduces brain injury in a cardiopulmonary bypass-circulatory arrest model of ischemia in a newborn piglet. Neurochem Res 2014; 39:2085-92. [PMID: 25082120 PMCID: PMC4265391 DOI: 10.1007/s11064-014-1399-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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] [Received: 03/03/2014] [Revised: 06/09/2014] [Accepted: 07/23/2014] [Indexed: 11/30/2022]
Abstract
Ischemic brain injury continues to be of major concern in patients undergoing cardiopulmonary bypass (CPB) surgery for congenital heart disease. Striatum and hippocampus are particularly vulnerable to injury during these processes. Our hypothesis is that the neuronal injury resulting from CPB and the associated circulatory arrest can be at least partly ameliorated by pre-treatment with granulocyte colony stimulating factor (G-CSF). Fourteen male newborn piglets were assigned to three groups: deep hypothermic circulatory arrest (DHCA), DHCA with G-CSF, and sham-operated. The first two groups were placed on CPB, cooled to 18 °C, subjected to 60 min of DHCA, re-warmed and recovered for 8-9 h. At the end of experiment, the brains were perfused, fixed and cut into 10 µm transverse sections. Apoptotic cells were visualized by in situ DNA fragmentation assay (TUNEL), with the density of injured cells expressed as a mean number ± SD per mm(2). The number of injured cells in the striatum and CA1 and CA3 regions of the hippocampus increased significantly following DHCA. In the striatum, the increase was from 0.46 ± 0.37 to 3.67 ± 1.57 (p = 0.002); in the CA1, from 0.11 ± 0.19 to 5.16 ± 1.57 (p = 0.001), and in the CA3, from 0.28 ± 0.25 to 2.98 ± 1.82 (p = 0.040). Injection of G-CSF prior to bypass significantly reduced the number of injured cells in the striatum and CA1 region, by 51 and 37 %, respectively. In the CA3 region, injured cell density did not differ between the G-CSF and control group. In a model of hypoxic brain insult associated with CPB, G-CSF significantly reduces neuronal injury in brain regions important for cognitive functions, suggesting it can significantly improve neurological outcomes from procedures requiring DHCA.
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Affiliation(s)
- Peter Pastuszko
- Section of Cardiac Surgery, The Ward Family Heart Center, Children's Mercy Hospital and Clinics, 2401 Gillham Road, Kansas City, MO, 64108, USA,
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Pastuszko P, Schears GJ, Pirzadeh A, Kubin J, Greeley WJ, Wilson DF, Pastuszko A. Effect of granulocyte-colony stimulating factor on expression of selected proteins involved in regulation of apoptosis in the brain of newborn piglets after cardiopulmonary bypass and deep hypothermic circulatory arrest. J Thorac Cardiovasc Surg 2012; 143:1436-42. [PMID: 22306220 DOI: 10.1016/j.jtcvs.2012.01.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Revised: 09/08/2011] [Accepted: 01/04/2012] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The study objective was to investigate the effect of granulocyte-colony stimulating factor on the expression of proteins that regulate apoptosis in newborn piglet brain after cardiopulmonary bypass and deep hypothermic circulatory arrest. METHODS The newborn piglets were assigned to 3 groups: (1) deep hypothermic circulatory arrest (30 minutes of deep hypothermic circulatory arrest, 1 hour of low-flow cardiopulmonary bypass); (2) deep hypothermic circulatory arrest with prior injection of granulocyte-colony stimulating factor (17 μg/kg 2 hours before cardiopulmonary bypass); and (3) sham-operated. After 2 hours of post-bypass recovery, the frontal cortex, striatum, and hippocampus were dissected. The expression of proteins was measured by gel electrophoresis or protein arrays. Data are presented in arbitrary units. Statistical analysis was performed using 1-way analysis of variance. RESULTS In the frontal cortex, only Fas ligand expression was significantly lower in the granulocyte-colony stimulating factor group when compared with the deep hypothermic circulatory arrest group. In the hippocampus, granulocyte-colony stimulating factor increased Bcl-2 (54.3 ± 6.4 vs 32.3 ± 2.2, P = .001) and serine/threonine-specific protein kinase (141.4 ± 19 vs 95.9 ± 21.1, P = .047) when compared with deep hypothermic circulatory arrest group. Caspase-3, Bax, Fas, Fas ligand, death receptor 6, and Janus protein tyrosine kinase 2 levels were unchanged. The Bcl-2/Bax ratio was 0.33 for deep hypothermic circulatory arrest group and 0.93 for the granulocyte-colony stimulating factor group (P = .02). In the striatum, when compared with the deep hypothermic circulatory arrest group, the granulocyte-colony stimulating factor group had higher levels of Bcl-2 (50.3 ± 7.4 vs 31.8 ± 3.8, P = .01), serine/threonine-specific protein kinase (132.7 ± 12.3 vs 14 ± 1.34, P = 2.3 × 10(6)), and Janus protein tyrosine kinase 2 (126 ± 17.4 vs 77.9 ± 13.6, P = .011), and lower levels of caspase-3 (12.8 ± 5.0 vs 32.2 ± 11.5, P = .033), Fas (390 ± 31 vs 581 ± 74, P = .038), Fas ligand (20.5 ± 11.5 vs 57.8 ± 15.6, P = .04), and death receptor 6 (57.4 ± 4.4 vs 108.8 ± 13.4, P = .007). The Bcl-2/Bax ratio was 0.25 for deep hypothermic circulatory arrest and 0.44 for the granulocyte-colony stimulating factor groups (P = .046). CONCLUSIONS In the piglet model of hypoxic brain injury, granulocyte-colony stimulating factor decreases proapoptotic signaling, particularly in the striatum.
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Affiliation(s)
- Peter Pastuszko
- Department of Surgery, University of California, San Diego, CA 92123, USA.
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Mammen A, Kubin J, Greeley WJ, Schears GJ, Pastuszko P, F Wilson D, Pastuszko A. Effect of hypoxia on expression of selected proteins involved in regulation of apoptotic activity in striatum of newborn piglets. Neurochem Res 2011; 36:746-53. [PMID: 21229310 PMCID: PMC3071469 DOI: 10.1007/s11064-010-0394-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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] [Accepted: 12/29/2010] [Indexed: 12/25/2022]
Abstract
The levels of selected neuroregulatory proteins that inhibit or promote apoptotic cell death were measured in the striatum of piglets subjected to precisely controlled 1 h hypoxic insult followed by 0, 2 and 4 h recovery and compared to sham operated animals. The anti-apoptotic proteins: there were increases in Survivin at 0 (157%, P = 0.031) and 4 h (171%, P = 0.033), in Bcl-XL at 0 (138%, P = 0.028) and 4 h (143%, P = 0.007), in VEGF at 4 h (185%, P = 0.019) and Hsp27 at 2 h (144%, P = 0.05) and 4 h (143%, P = 0.05). The pro-apoptotic proteins: caspases-1 and 7 increased at 4 h (135%, P = 0.05) and (129%, P = 0.038), respectively. Bim increased after 4 h (115%, P = 0.028), Apoptosis Inducing Factor after 2 h (127%, P = 0.048) and Calpain after 4 h (143% of control, P = 0.04). Hypoxia causes increase in levels of both anti- and pro-apoptotic proteins. Their relative activity determines the outcome in terms of cell damage and neuronal deficit.
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Affiliation(s)
- A Mammen
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, USA
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Pirzadeh A, Mammen A, Kubin J, Reade E, Liu H, Mendoza A, Greeley WJ, Wilson DF, Pastuszko A. Early regional response of apoptotic activity in newborn piglet brain following hypoxia and ischemia. Neurochem Res 2010; 36:83-92. [PMID: 20872244 DOI: 10.1007/s11064-010-0267-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2010] [Indexed: 12/24/2022]
Abstract
Responses of selected neuroregulatory proteins that promote (Caspase 3 and Bax) or inhibit (Bcl-2, high Bcl-2/Bax ratio) apoptotic cell death were measured in the brain of piglets subjected to precisely controlled hypoxic and ischemic insults: 1 h hypoxia (decreasing FiO₂ from 21 to 6%) or ischemia (ligation of carotid arteries and hemorrhage), followed by 0, 2 and 4 h recovery with 21% FiO₂. Protein expression was measured in cortex, hippocampus and striatum by Western blot. There were no significant differences in expression of Caspase-3 between sham operated, hypoxic and ischemic groups. There were significant regional differences in expression of Bcl-2 and Bax in response to hypoxia and ischemia. The changes in Bcl-2/Bax ratio were similar for hypoxia and ischemia except for striatum at zero time recovery, with ischemia giving lower ratios than hypoxia. The Bcl-2/Bax ratio was also lower for the striatum than for the other regions of the brain, suggesting this region is the more susceptible to apoptotic injury.
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Affiliation(s)
- A Pirzadeh
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Philadelphia, PA, USA
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13
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Pastuszko P, Greeley WJ, Wilson DF, Pastuszko A. Reply to Sakurai. Brain injury in cardiopulmonary bypass surgery. Eur J Cardiothorac Surg 2009. [DOI: 10.1016/j.ejcts.2009.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Pastuszko P, Pirzadeh A, Reade E, Kubin J, Mendoza A, Schears GJ, Greeley WJ, Pastuszko A. The effect of hypothermia on neuronal viability following cardiopulmonary bypass and circulatory arrest in newborn piglets. Eur J Cardiothorac Surg 2009; 35:577-81; discussion 581. [PMID: 19217795 DOI: 10.1016/j.ejcts.2009.01.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2008] [Revised: 01/01/2009] [Accepted: 01/03/2009] [Indexed: 10/21/2022] Open
Abstract
OBJECTIVE To determine the effect of recovery with mild hypothermia after cardiopulmonary bypass (CPB) and deep hypothermic circulatory arrest (DHCA) on the activity of selected key proteins involved in initiation (Bax, Caspase-3) or inhibition of apoptotic injury (Bcl-2, increased ratio Bcl-2/Bax) in the brain of newborn piglets. METHODS The piglets were placed on CPB, cooled with pH-stat management to 18 degrees C, subjected to 30 min of DHCA followed by 1h of low flow at 20 ml/kg/min, rewarmed to 37 degrees C (normothermia) or to 33 degrees C (hypothermia), separated from CPB, and monitored for 6h. Expression of above proteins was measured in striatum, hippocampus and frontal cortex by Western blots. The results are mean for six experiments+/-SEM. RESULTS There were no significant differences in Bcl-2 level between normothermic and hypothermic groups. The Bax levels in normothermic group in cortex, hippocampus and striatum were 94+/-9, 136+/-22 and 125+/-34 and decreased in the hypothermic group to 59+/-17 (p=0.028), 70+/-6 (p=0.002) and 48+/-8 (p=0.01). In cortex, hippocampus and striatum Bcl-2/Bax ratio increased from 1.23, 0.79 and 0.88 in normothermia to 1.96, 1.28 and 2.92 in hypothermia. Expression of Caspase-3 was 245+/-39, 202+/-74 and 244+/-31 in cortex, hippocampus and striatum in the normothermic group and this decreased to 146+/-24 (p=0.018), 44+/-16 (p=7 x 10(-7)) and 81+/-16 (p=0.01) in the hypothermic group. CONCLUSION In neonatal piglet model of cardiopulmonary bypass with circulatory arrest, mild hypothermia during post bypass recovery provides significant protection from cellular apoptosis, as indicated by lower expression of Bax and Caspase-3 and an increased Bcl-2/Bax ratio. The biggest protection was observed in striatum probably by decreasing of neurotoxicity of striatal dopamine.
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Affiliation(s)
- Peter Pastuszko
- Department of Surgery, The University of California - San Diego, San Diego, CA, USA
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Mendoza-Paredes A, Liu H, Schears G, Yu Z, Markowitz SD, Schultz S, Pastuszko P, Greeley WJ, Nadkarni V, Kubin J, Wilson DF, Pastuszko A. Resuscitation with 100%, compared with 21%, oxygen following brief, repeated periods of apnea can protect vulnerable neonatal brain regions from apoptotic injury. Resuscitation 2007; 76:261-70. [PMID: 17765386 PMCID: PMC2610457 DOI: 10.1016/j.resuscitation.2007.07.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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] [Received: 03/21/2007] [Revised: 07/12/2007] [Accepted: 07/13/2007] [Indexed: 01/22/2023]
Abstract
PURPOSE To determine the effect of repeated intermittent apnea and resuscitation with 100% vs. 21% oxygen enriched gas on levels of key regulatory proteins contributing to cell death (Bax, Caspase-3) or protecting neurons from hypoxic/ischemic injury (Bcl-2, p-Akt, p-CREB). METHODS The anaesthetized, mechanically ventilated newborn piglets underwent 10 episodes of apnea with resuscitation either with 100% or with 21% oxygen. Following 6h recovery the animals were sacrificed painlessly, the brain dissected out and used to determine levels of Bcl-2, Bax, Caspase-3, p-Akt and p-CREB in the striatum, frontal cortex, midbrain and hippocampus were studied. RESULTS In hippocampus and striatum, Bcl-2 expression was higher with 100% vs. 21% group (173+/-29% vs. 121+/-31%, p<0.05 and 189+/-10% vs. 117+/-47%, p<0.01, respectively) whereas the Bax expression was lower (88+/-3% vs. 100+/-9%, p<0.05 and 117+/-5% vs. 133+/-10%, p<0.05, respectively). Expression of Caspase-3 in the striatum, was lower with 100% vs. 21% group (197+/-35% vs. 263+/-33%, p<0.05, respectively) but not different in the hippocampus. p-Akt expression was higher with 100% vs. 21% oxygen in the hippocampus and striatum (225+/-44% vs. 108+/-35%, p<0.01 and 215+/-12% vs. 164+/-16%, p<0.01, respectively). The p-CREB expression was higher with 100% vs. 21% oxygen resuscitation in the hippocampus (217+/-41% vs. 132+/-30%, p<0.01) with no changes in striatum. Much smaller or insignificant differences between 100% vs. 21% oxygen groups were observed in the frontal cortex and midbrain, respectively. CONCLUSION In neonatal piglet model of intermittent apnea, selectively vulnerable regions of brain (striatum and hippocampus) are better protected from apoptotic injury when resuscitation was conducted with 100%, rather than 21%, oxygen.
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Affiliation(s)
- Alberto Mendoza-Paredes
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Huiping Liu
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Gregory Schears
- Department of Anesthesiology & Critical Care, Mayo Clinic, Rochester
| | - Zajfang Yu
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Scott D Markowitz
- Department of Anesthesiology & Critical Care, The Children’s Hospital of Philadelphia, Philadelphia, PA
| | | | - Peter Pastuszko
- Department of Surgery, The University of Oklahoma, Oklahoma City, OK
| | - William J Greeley
- Department of Anesthesiology & Critical Care, The Children’s Hospital of Philadelphia, Philadelphia, PA
| | - Vinay Nadkarni
- Department of Anesthesiology & Critical Care, The Children’s Hospital of Philadelphia, Philadelphia, PA
| | - Joanna Kubin
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
| | - David F Wilson
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Anna Pastuszko
- Department of Biochemistry & Biophysics, The University of Pennsylvania School of Medicine, Philadelphia, PA
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Markowitz SD, Mendoza-Paredes A, Liu H, Pastuszko P, Schultz SP, Schears GJ, Greeley WJ, Wilson DF, Pastuszko A. Response of brain oxygenation and metabolism to deep hypothermic circulatory arrest in newborn piglets: comparison of pH-stat and alpha-stat strategies. Ann Thorac Surg 2007; 84:170-6. [PMID: 17588406 PMCID: PMC2782723 DOI: 10.1016/j.athoracsur.2007.02.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [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: 10/16/2006] [Revised: 01/30/2007] [Accepted: 02/05/2007] [Indexed: 11/21/2022]
Abstract
BACKGROUND To determine the effect of pH-stat as compared with alpha-stat management on brain oxygenation, level of striatal extracellular dopamine, phosphorylation, and levels of protein kinase B (Akt) and cyclic adenosine 3', 5'-monophosphate response element-binding protein (CREB), and levels of extracellular signal-regulated kinase (ERK)1/2, Bcl-2, and Bax in a piglet model of deep hypothermic circulatory arrest (DHCA). METHODS The piglets were placed on cardiopulmonary bypass (CPB), cooled with pH-stat or alpha-stat to 18 degrees C, subjected to 90 minutes of DHCA, rewarmed, weaned from CPB, and maintained for two hours recovery. The cortical oxygen was measured by: quenching of phosphorescence; dopamine by microdialysis; phosphorylation of CREB (p-CREB), ERK (p-ERK) 1/2, Akt (p-Akt), and level of Bcl-2, Bax by Western blots. RESULTS Oxygen pressure histograms for the microvasculature of the cortex show substantially higher oxygen levels during cooling and during the oxygen depletion period after cardiac arrest (up to 15 minutes) when using pH-stat compared with alpha-stat management. Significant increases in dopamine occurred at 45 minutes and 60 minutes of DHCA in the alpha-stat and pH-stat groups, respectively. The p-CREB and p-Akt in the pH-stat group were significantly higher than in the alpha-stat group (140 +/- 9%, p < 0.05 and 125 +/- 6%, p < 0.05, respectively). There was no significant difference in p-ERK1/2 and Bax. The Bcl-2 increased in the pH-stat group to 121 +/- 4% (p < 0.05) compared with the alpha-stat group. The ratio Bcl-2:Bax increased in the pH-stat group compared with the alpha-stat group. CONCLUSIONS The increase in p-CREB, p-Akt, Bcl-2, Bcl-2/Bax, and delay in increase of dopamine indicated that pH-stat, in the piglet model, prolongs "safe" time of DHCA and provides some brain protection against ischemic injury.
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Affiliation(s)
- Scott D Markowitz
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Pastuszko P, Liu H, Mendoza-Paredes A, Schultz SE, Markowitz SD, Greeley WJ, Wilson DF, Pastuszko A. Brain oxygen and metabolism is dependent on the rate of low-flow cardiopulmonary bypass following circulatory arrest in newborn piglets. Eur J Cardiothorac Surg 2007; 31:899-905. [PMID: 17336082 DOI: 10.1016/j.ejcts.2007.01.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [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: 09/14/2006] [Revised: 12/10/2006] [Accepted: 01/15/2007] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVE To determine the optimum rate of low-flow hypothermic cardiopulmonary bypass (LF), following circulatory arrest (DHCA) on brain oxygenation (bO(2)), extracellular dopamine (DA), phosphorylation of select neuroregulatory proteins responsible for neuronal injury, and survival following ischemic brain injury: CREB, Erk1/2, Akt, Bcl-2, and Bax. METHODS The piglets were placed on cardiopulmonary bypass (CPB) and cooled to 18 degrees C. They were then subjected to 30 min of DHCA followed by 1h of LF at 20, 50, or 80 ml/(kg/min), rewarmed, separated from CPB, and maintained for 2h. The bO(2) was measured by quenching of phosphorescence; DA by microdialysis; phosphorylation of CREB, ERK1/2, Akt, Bcl-2, and Bax by Western blots. The results are means+/-SD for seven experiments. RESULTS Pre-bypass bO(2) was 47.4+/-4.2 mmHg and decreased to 1.9+/-0.8 mmHg during DHCA. At the end of LF at 20, 50, and 80 ml/(kg/min), bO(2) was 11.8+/-1.6, 26+/-1.8, and 33.9+/-2.6 mmHg, respectively. The DA increased 510-fold relative to control (p<0.001) by 15 min of LF-20 with maximum increase occurring at 45 min. With LF-50, increase in DA was not statistically significant and no increase was observed when LF-80 was used. Bcl-2 immunoreactivity increased after LF-50 and LF-80 (140+/-14.5%, p<0.05 and 202+/-34%, p<0.05, respectively). Neither flow increased Bax immunoreactivity. The ratio of Bcl-2/Bax, pCREB, pAkt, pErk increased significantly with increasing the flow rate of LF. CONCLUSIONS The protective effect of LF following DHCA on brain metabolism is dependent on the flow rate. Flow-dependent increase in pCREB, pErk1/2, pAkt, increase in Bcl-2/Bax, and decrease in DA indicated that to minimize DHCA-dependent neuronal injury, LF flow should be above 50 ml/(kg/min).
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Affiliation(s)
- Peter Pastuszko
- Department of Surgery, The University of Oklahoma, Oklahoma City, OK, USA.
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Zuppa AF, Nicolson SC, Adamson PC, Wernovsky G, Mondick JT, Burnham N, Hoffman TM, Gaynor JW, Davis LA, Greeley WJ, Spray TL, Barrett JS. Population Pharmacokinetics of Milrinone in Neonates with Hypoplastic Left Heart Syndrome Undergoing Stage I Reconstruction. Anesth Analg 2006; 102:1062-9. [PMID: 16551899 DOI: 10.1213/01.ane.0000198626.67391.34] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [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: 11/05/2022]
Abstract
We performed a blinded, randomized pharmacokinetic study of milrinone in 16 neonates with hypoplastic left heart undergoing stage I reconstruction to determine the impact of cardiopulmonary bypass and modified ultrafiltration on drug disposition and to define the drug exposure during a continuous IV infusion of drug postoperatively. Neonates received an initial dose of either a 100 or 250 microg/kg of milrinone into the cardiopulmonary bypass circuit at the start of rewarming. Postoperatively, milrinone was infused to clinical needs. A mixed-effect modeling approach was used to characterize milrinone pharmacokinetics during cardiopulmonary bypass, modified ultrafiltration, and postoperatively using the NONMEM algorithm. All patients in this study demonstrated a modified ultrafiltration concentrating effect that occurred despite a modified ultrafiltration drug clearance of 3.3 mL x kg(-1) x min(-1). The infants in this study demonstrated an impaired renal clearance during the immediate postoperative period. A constant infusion of 0.5 microg x kg(-1) x min(-1) resulted in drug accumulation during the initial 12 h of drug administration. Postoperatively, milrinone clearance was significantly impaired (0.4 mL x kg(-1) x min(-1)), improved by the 12th postoperative hour, and approached steady-state clearance (2.6 mL x kg(-1) x min(-1)) by postoperative day 4. In the postoperative setting of markedly impaired renal function, an infusion rate of 0.2 microg x kg(-1) x min(-1) should be considered.
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Affiliation(s)
- Athena F Zuppa
- Division of Clinical Pharmacology and Therapeutics, Department of Pediatrics, Abramson Research Center, Philadelphia, Pennsylvania 19104-4318, USA.
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Nathan A, Ganesh A, Godinez RI, Nicolson SC, Greeley WJ. Hyperkalemic cardiac arrest after cardiopulmonary bypass in a child with unsuspected duchenne muscular dystrophy. Anesth Analg 2005; 100:672-674. [PMID: 15728050 DOI: 10.1213/01.ane.0000146533.21771.2f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [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: 11/05/2022]
Abstract
Adverse reactions to volatile anesthetics and depolarizing muscle relaxants can occur in patients with Duchenne muscular dystrophy (DMD) resulting in acute rhabdomyolysis and hyperkalemia. We report a case of hyperkalemic cardiac arrest after cardiac surgery using cardiopulmonary bypass in a child with unsuspected DMD. Early diagnosis and management of hyperkalemia resulted in a successful outcome. Genetic testing confirmed the diagnosis of DMD. We recommend a thorough preoperative investigation, including creatine kinase estimation, in children with a history of unexplained motor delay.
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Affiliation(s)
- Aruna Nathan
- *Department of Anesthesia and Critical Care Medicine, The Children's Hospital of Philadelphia; and †Department of Anesthesia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
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Schears G, Shen J, Creed J, Zaitseva T, Wilson DF, Greeley WJ, Pastuszko A. Brain oxygenation during cardiopulmonary bypass and circulatory arrest. Adv Exp Med Biol 2003; 510:325-30. [PMID: 12580448 DOI: 10.1007/978-1-4615-0205-0_53] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Quantitative measurements of oxygen distribution in the microcirculation of the brain cortex of newborn piglets were made during different modes of cardiopulmonary bypass. Three groups of animals, anesthetized and mechanically ventilated, were studied. The first group of animals were maintained on normothermic cardiopulmonary bypass (CPB) at a flow of 100 ml/kg/min, while the second and third groups underwent low flow hypothermic cardiopulmonary bypass (40 ml/kg/min at 18 degrees C) (LFCPB) and deep hypothermic (18 degrees C) circulatory arrest (DHCA), respectively. After bypass, the piglets were monitored for a two hours post-bypass recovery period. CPB caused a decrease in the cortical oxygen from 62 +/- 3 mm Hg to 32 +/- 7 mm Hg at the beginning of bypass and to 36 +/- 5 mm Hg at the end of bypass. During the recovery period, cortical oxygenation steadily decreased, reaching 29 +/- 8 mm Hg at the end of the experiment. With initiation of LFCPB, cortical oxygen decreased to 22 +/- 7 mm Hg. Upon rewarming cortical oxygen increased to 37 +/- 5 mm Hg and then decreased again to about 30 mm Hg at the end of two hours of post-bypass recovery. Similar changes in cortical oxygenation were observed during DHCA. In DHCA cortical oxygen decreased to 19 +/- 4 mm Hg and during rewarming and recovery increased to 35 +/- 6 mm Hg. In conclusion, it has been shown that in newborn piglets recovering from CPB, LFCPB and DHCA, when the blood pressure remained above 55 mm Hg and therefore total blood flow should be well maintained, oxygen pressure in the microvasculature is significantly lower than for pre-bypass. It is suggested that the decreased oxygenation is due to increased heterogeneity in resistance in the microcirculatory units, resulting in broadened distribution of flow rates and oxygen levels.
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Affiliation(s)
- Gregory Schears
- Dept. of Biochem. & Biophys., University of Pennsylvania, School of Medicine, Philadelphia, PA 19104, USA
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Greeley WJ, Cook-Sather SD, Harris KA, Chiavacci R, Gallagher PR, Schreiner MS. A liberalized fasting guideline for formula-fed infants does not increase average gastric fluid volume before elective surgery. Anesth Analg 2003; 96:965-969. [PMID: 12651643 DOI: 10.1213/01.ane.0000055807.31411.8b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/05/2022]
Abstract
UNLABELLED Recommended preoperative fasting intervals for infant formula vary from 4 to 8 h. We conducted a prospective, randomized, observer-blinded trial of 97 ASA physical status I and II infants scheduled for elective surgery to determine whether average gastric fluid volume (GFV) recovered from infants formula-fasted for 4 h (liberalized fast, Group L) differed from that recovered from infants allowed clear liquids up until 2 h, but fasted 8 h for formula and solids (traditional fast, Group T). In Group L, 31 of 39 subjects followed protocol and ingested formula 4-6 h before surgery. In Group T, 36 of 58 subjects followed protocol, taking clear liquids 2-5 h before the induction of anesthesia. Thirty subjects had prolonged fasts and were included only in a secondary intent-to-treat analysis. Respective mean age (5.7 +/- 2.3 versus 6.4 +/- 2.4 mo; range, 0.7-10.5 mo), weight (7.5 +/- 1.8 versus 7.5 +/- 1.1 kg), and volume of last feed (4.9 +/- 2.2 versus 4.0 +/- 2.3 oz.) did not vary between Groups L and T. GFV (L: 0.19 +/- 0.38 versus T: 0.16 +/- 0.30 mL/kg) and gastric fluid pH (L: 2.5 +/- 0.5 versus T: 2.9 +/- 1.3) did not vary. For all subjects, GFV (mL/kg) increased with age (Spearman correlation coefficient = +0.23, P = 0.03). Infant irritability and hunger and parent satisfaction were similar between groups. We conclude that average GFV after either a 4- to 6-h fast for infant formula or 2-h fast after clear liquids is small and not significantly different between groups. On the basis of these findings, clinicians may consider liberalizing formula feedings to 4 h before surgery in selected infants. IMPLICATIONS Healthy infants aged < or =10.5 mo may drink formula up to 4 h before surgery without increasing gastric fluid volume compared with infants allowed clear liquids up to 2 h and formula 8 h before surgery.
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Affiliation(s)
- William J Greeley
- Departments of *Anesthesiology and Critical Care Medicine and †Pediatrics, Division of Biostatistics and Epidemiology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
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Greeley WJ, Birmingham PK, Wheeler M, Suresh S, Dsida RM, Rae BR, Obrecht J, Andreoni VA, Hall SC, Coté CJ. Patient-controlled epidural analgesia in children: can they do it? Anesth Analg 2003; 96:686-691. [PMID: 12598244 DOI: 10.1213/01.ane.0000047209.18191.9e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 11/05/2022]
Abstract
UNLABELLED Extensive clinical experience and many studies support the use of i.v. patient-controlled analgesia (i.v. PCA) and regional anesthesia techniques for the treatment of postoperative pain in children. In contrast, little has been reported about the ability of children to use patient-controlled epidural analgesia (PCEA) or about the efficacy of this technique. We report a descriptive analysis of prospectively recorded data in 128 children (132 procedures) in whom PCEA was used for acute postoperative pain control. Satisfactory analgesia was obtained in 119 patients (90.1%) for up to 103 h with no episodes of desaturation and without clinical evidence of toxicity or serious adverse effects. Analgesia was satisfactory with the initial settings in 89 patients; in 38 others, this was achieved with changes in PCEA settings or solution. Five patients were switched to i.v. PCA because of inadequate analgesia. Eight patients with satisfactory analgesia were converted to i.v. PCA because of adverse effects. Children as young as 5 yr had the cognitive ability to understand and the willingness to use PCEA, consistent with reported use of i.v. PCA. Careful attention should be paid to the total hourly local anesthetic dose to avoid exceeding the recommended limits. Our prospectively collected data demonstrate that PCEA provides satisfactory analgesia with a small incidence of adverse side effects in children and should be considered along with other strategies in pediatric postoperative pain management. IMPLICATIONS A descriptive analysis of prospectively recorded data in 132 children receiving patient-controlled epidural analgesia for postoperative pain relief demonstrates satisfactory analgesia without serious toxicity or side effects in children as young as 5 yr. This modality should be considered as another strategy in pediatric postoperative pain management.
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MESH Headings
- Adolescent
- Analgesia, Epidural/adverse effects
- Analgesia, Epidural/psychology
- Analgesia, Patient-Controlled/adverse effects
- Analgesia, Patient-Controlled/psychology
- Analgesics, Opioid/administration & dosage
- Analgesics, Opioid/therapeutic use
- Anesthetics, Local/administration & dosage
- Anesthetics, Local/therapeutic use
- Bupivacaine/administration & dosage
- Bupivacaine/therapeutic use
- Child
- Child, Preschool
- Female
- Fentanyl/administration & dosage
- Fentanyl/therapeutic use
- Humans
- Male
- Pain Measurement/drug effects
- Pain, Postoperative/drug therapy
- Prospective Studies
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Affiliation(s)
- William J Greeley
- Departments of *Anesthesiology, †Nursing, and ‡Pediatrics, Children's Memorial Hospital at Northwestern University Medical School, Chicago, Illinois
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Schears G, Schultz SE, Creed J, Greeley WJ, Wilson DF, Pastuszko A. Effect of perfusion flow rate on tissue oxygenation in newborn piglets during cardiopulmonary bypass. Ann Thorac Surg 2003; 75:560-5. [PMID: 12607673 DOI: 10.1016/s0003-4975(02)04342-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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: 10/27/2022]
Abstract
BACKGROUND Our knowledge of the best perfusion flow rate to use during cardiopulmonary bypass (CPB) in order to maintain tissue oxygenation remains incomplete. The present study examined the effects of perfusion flow rate and patent ductus arteriosus (PDA) during normothermic CPB on oxygenation in several organ tissues of newborn piglets. METHODS The experiments were performed on 12 newborn piglets: 6 with PDA ligation (PDA-L), and 6 without PDA ligation (PDA-NL). CPB was performed through the chest at 37 degrees C. During CPB, the flow rate was changed at 15-minute intervals, ranging from 100 to 250 ml/kg/min. Tissue oxygenation was measured by quenching of phosphorescence. RESULTS For the PDA-L group, oxygen in the brain did not change significantly with changes in flow rate. In contrast, for the PDA-NL group, oxygen was dependent upon the flow rate. Statistically significant decreases in cortical oxygen were observed with flow rates below 175 ml/kg/min. Within the myocardium, liver, and intestine, there were no significant differences in the oxygen levels between the PDA-L and PDA-NL groups. In these tissues, the oxygen decreased significantly as the flow rate decreased below 150 ml/kg/min, 125 ml/kg/min, and 175 ml/kg/min, respectively. Oxygen pressure in skeletal muscle was not dependent on either PDA ligation or flow rate. CONCLUSIONS In newborn piglets undergoing CPB, the presence of a PDA results in reduced tissue oxygenation to the brain but not to other organs. In general, perfusion flow rates of 175 ml/kg/min or greater are required in order to maintain normal oxygenation of all organs except muscle.
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Affiliation(s)
- Gregory Schears
- Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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Schreiner MS, Greeley WJ. Pediatric clinical trials: shall we take a lead? Anesth Analg 2002; 94:1-3. [PMID: 11772791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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Greeley WJ. Pediatric Critical Care: The Essentials. Anesth Analg 2000. [DOI: 10.1213/00000539-200002000-00065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Affiliation(s)
- L M Montenegro
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, PA 19104, USA
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Greeley WJ. Clinical Pediatric Anesthesia. Anesth Analg 1998. [DOI: 10.1213/00000539-199807000-00063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Greeley WJ. Trasylol Pediatric Investigational Meeting. Introduction. Ann Thorac Surg 1998; 65:S29-30. [PMID: 9647134 DOI: 10.1016/s0003-4975(98)00325-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- W J Greeley
- Department of Anesthesiology and Critical Care Medicine, The Children's Hospital of Philadelphia, Pennsylvania 19104-4399, USA
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Cheifetz IM, Kern FH, Schulman SR, Greeley WJ, Ungerleider RM, Meliones JN. Serum lactates correlate with mortality after operations for complex congenital heart disease. Ann Thorac Surg 1997; 64:735-8. [PMID: 9307466 DOI: 10.1016/s0003-4975(97)00527-4] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.9] [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] [Indexed: 02/05/2023]
Abstract
BACKGROUND The objective of this study was to determine whether serum lactate levels predict mortality in children less than 1 year of age who have undergone cardiopulmonary bypass and operations for complex congenital heart disease. METHODS The initial lactate, maximum lactate, and lactate levels at 4 to 6 hours after operation were analyzed for each of 48 children less than 12 months of age who underwent cardiopulmonary bypass. RESULTS Data were analyzed for the 6 patients who died and the 42 patients who survived. For the patients who died, the initial postoperative serum lactate, maximum lactate, and 4- to 6-hour lactate levels were significantly higher than those in the patients who survived. All patients with an initial lactate less than 7 mmol/L, a maximum lactate less than 9 mmol/L, or a 4- to 6-hour lactate level less than 4 mmol/L survived to hospital discharge. CONCLUSIONS Serum lactate levels may be a useful predictor of mortality in children less than 1 year of age who have undergone cardiopulmonary bypass. An elevation in serum lactate level after a complex operation for congenital heart disease should be taken as a serious indicator of potential mortality.
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Affiliation(s)
- I M Cheifetz
- Department of Pediatrics, Duke Children's Hospital, Duke University Medical Center, Durham, North Carolina 27710, USA.
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Tsui SS, Kirshbom PM, Davies MJ, Jacobs MT, Kern FH, Gaynor JW, Greeley WJ, Ungerleider RM. Thromboxane A2-receptor blockade improves cerebral protection for deep hypothermic circulatory arrest. Eur J Cardiothorac Surg 1997; 12:228-35. [PMID: 9288512 DOI: 10.1016/s1010-7940(97)00095-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVE Following the use of deep hypothermic circulatory arrest in cardiac surgery, cerebral blood flow and cerebral oxygen metabolism are impaired. These may result from abnormal cerebral vasospasm. Powerful vasoconstrictors including endothelins and thromboxane A2 could mediate these processes. We investigated possible involvement of these two factors by assessing the effects of (a) phosphoramidon-an inhibitor of endothelin converting enzyme, and (b) vapiprost (GR32191B)-a specific thromboxane A2-receptor antagonist, on the recovery of cerebral blood flow and cerebral oxygen metabolism following deep hypothermic circulatory arrest. METHODS A total of 18 1-week-old piglets were randomised into three groups (n = 6 per group). At induction, the control group received saline; group PHOS received phosphoramidon 30 mg kg-1 intravenously. Group VAP received vapiprost 2 mg kg-1 at induction and at 30 min intervals thereafter. All groups underwent cardiopulmonary bypass cooling to 18 degrees C, exposed to 60 min of deep hypothermic circulatory arrest, rewarmed and reperfused for 1 h. Cerebral blood flow was measured with radio-labeled microspheres: cerebral oxygen metabolism was calculated at baseline before deep hypothermic circulatory arrest and at 1 h of reperfusion and rewarming. RESULTS In the control group, cerebral blood flow decreased to 40.2 +/- 2.0% of baseline after deep hypothermic circulatory arrest and cerebral oxygen metabolism decreased to 50.0 +/- 5.5% (P < 0.0005). The responses in group PHOS were similar. In group VAP, cerebral blood flow and cerebral oxygen metabolism were 64.3 +/- 10.6 and 80.1 +/- 9.8% of baseline, respectively, after deep hypothermic circulatory arrest. Thus, treatment with vapiprost significantly improved recovery of cerebral blood flow (P = 0.046) and cerebral oxygen metabolism (P = 0.020) following deep hypothermic circulatory arrest. No such improvement was seen after treatment with phosphoramidon. CONCLUSIONS Thromboxane A2 mediates impairments in cerebral perfusion and metabolism following deep hypothermic circulatory arrest. These changes were attenuated by blockade of thromboxane A2-receptors using vapiprost. Endothelins are not shown to be involved. Better knowledge of injury mechanisms will enable development of more effective cerebral protection strategies and allow safer application of deep hypothermic circulatory arrest.
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Affiliation(s)
- S S Tsui
- Department of Surgery, Duke University Medical Center, Durham, NC, USA
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Ungerleider RM, Bengur AR, Kessenich AL, Liekweg RJ, Hart EM, Rice BA, Miller CE, Lockwood NW, Knauss SA, Jaggers J, Sanders SP, Greeley WJ. Risk factors for higher cost in congenital heart operations. Ann Thorac Surg 1997; 64:44-8; discussion 49. [PMID: 9236333 DOI: 10.1016/s0003-4975(97)00503-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [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] [Indexed: 02/04/2023]
Abstract
BACKGROUND For many congenital heart defects, hospital mortality is no longer a sensitive parameter by which to measure outcome. Although hospital survival rates are now excellent for a wide variety of lesions, many patients require expensive and extensive hospital-based services during the perioperative period to enable their convalescence. These services can substantially increase the cost of care delivery. In today's managed care environment, it would be useful if risk factors for higher cost could be identified preoperatively so that appropriate resources could be made available for the care of these patients. The focus of this retrospective investigation is to determine if risk factors for high cost for repair of congenital heart defects can be identified. METHODS We assessed financial risk by tracking actual hospital costs (not charges) for 144 patients undergoing repair of atrial septal defect (58 patients), ventricular septal defect (48 patients), atrioventricular canals (14 patients), or tetralogy of Fallot (24 patients) at Duke University Medical Center between July 1, 1992, and September 15, 1995. Furthermore, we were able to identify where the costs occurred within the hospital. Financial risk was defined as a large (> 60% of mean costs) standard deviation, which indicated unpredictability and variability in the treatment for a group of patients. RESULTS Cost for atrial septal defect repair was predictably consistent (low standard deviation) and was related to hospital length of stay. There were factors, however, for ventricular septal defect, atrioventricular canal, and tetralogy of Fallot repair that are identifiable preoperatively that predict low- and high-risk groups using cost as an outcome parameter. Patients undergoing ventricular septal defect repair who were younger than 6 months of age at the time of repair, who required preoperative hospital stays of longer than 7 days before surgical repair, or who had Down's syndrome had a less predictable cost picture than patients undergoing ventricular septal defect repair who were older than 2 years, who had short (< 4 days) preoperative hospitalization, or who did not have Down's syndrome ($48,252 +/- $42,539 versus $15,819 +/- $7,219; p = 0.008). Patients with atrioventricular canals who had long preoperative hospitalization (> 7 days), usually due to pneumonia (respiratory syncytial virus) with preoperative mechanical ventilation had significantly higher cost than patients with atrioventricular canals who underwent elective repair with short preoperative hospitalization ($83,324 +/- $60,138 versus $26,904 +/- $5,384; p = 0.05). Patients with tetralogy of Fallot had higher costs if they had multiple congenital anomalies, previous palliation (combining costs of both surgical procedures and hospital stays), or severe "tet" spells at the time of presentation for operation compared with patients without these risk factors ($114,202 +/- $88,524 versus $22,241 +/- $7,071; p = 0.0005). One patient (with tetralogy of Fallot) with multiple congenital anomalies died 42 days after tetralogy of Fallot repair of sepsis after a gastrointestinal operation. Otherwise, hospital mortality was 0% for all groups. CONCLUSIONS Low mortality and good long-term outcome for surgical correction of congenital heart defects is now commonplace, but can be expensive as some patients with complex problems receive the care necessary to survive. This study demonstrates that it is possible to identify factors preoperatively that predict financial risk. This knowledge may facilitate implementation of risk adjustments for managed care contracting and for strategic resource allocation.
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Affiliation(s)
- R M Ungerleider
- Department of Nursing Services, Duke University Medical Center, Durham, NC 27712, USA.
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Abstract
BACKGROUND During profoundly hypothermic cardiopulmonary bypass, cerebral venous oxygen saturation increases (eg, to 98% at 15 degrees C). We reanalyzed results of clinical studies to learn why. METHODS One hundred sixty-eight cerebral oxygen transport measurements were available from 96 infants and children undergoing profoundly hypothermic cardiopulmonary bypass during repair of congenital heart defects. RESULTS Dissolved oxygen accounted for 2% to 17% of arterial oxygen content, depending on the arterial oxygen partial pressure and hemoglobin concentration. The fraction of the cerebral metabolic rate for oxygen obtained from dissolved oxygen depended on pump flow, temperature, hemoglobin concentration, and arterial oxygen partial pressure (all p < 10(-3)). For "full-flow" cardiopulmonary bypass, temperatures less than 18 degrees C, and arterial oxygen partial pressure measurements more than 180 mm Hg, the mean +/- standard deviation of the fraction of cerebral metabolic rate for oxygen obtained from dissolved oxygen equaled 77% +/- 19%. CONCLUSIONS Dissolved oxygen satisfies most of the brain's oxygen requirements during profound hypothermic cardiopulmonary bypass. This result reflects four properties of profound hypothermic cardiopulmonary bypass: (1) increases in hemoglobin's oxygen affinity due to profound hypothermia (which impairs oxygen transfer from hemoglobin to cerebral tissue), (2) use of hemodilution, (3) use of high arterial oxygen partial pressure, and (4) low cerebral metabolic rate of oxygen.
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Affiliation(s)
- F Dexter
- Department of Anesthesia, University of Iowa, Iowa City 52242, USA
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Ungerleider RM, Kanter RJ, O'Laughlin M, Bengur AR, Anderson PA, Herlong JR, Li J, Armstrong BE, Tripp ME, Garson A, Meliones JN, Jaggers J, Sanders SP, Greeley WJ. Effect of repair strategy on hospital cost for infants with tetralogy of Fallot. Ann Surg 1997; 225:779-83; discussion 783-4. [PMID: 9230818 PMCID: PMC1190888 DOI: 10.1097/00000658-199706000-00015] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE This study compares the total hospital cost (HC) for one-stage versus "two-stage" repair of tetralogy of Fallot (TOF) in infants younger than 1 year of age. SUMMARY BACKGROUND DATA Total (one-stage) correction of TOF is now being performed with excellent results in infancy. Alternatively, a two-stage approach, with palliation of infants in the first year of life, followed by complete repair at a later time can be used. In some institutions, the two-stage approach is standard practice for infants younger than 1 year of age or is used selectively in patients with an anomalous coronary artery across the right ventricular outflow tract (RVOT), "small pulmonary arteries," multiple congenital anomalies, critical illnesses (CI), which increase the risk of bypass (e.g., sepsis or DIC), or severe hypercyanotic spells (HS) at the time of presentation. The cost implications of these two approaches are unknown. METHODS The authors reviewed 22 patients younger than 1 year of age who underwent repair of TOF at their institution between 1993 and 1995. Eighteen patients had one-stage (1 degree) repair (mean age, 3.4 +/- 3.1 months; range, 3 days-9 months) and 4 patients were treated by a staged approach with initial palliation (1.6 +/- 0.4 month; range, 1.5-2 months) followed by later repair (14.75 +/- 1.5 months; range, 13-16 months). The reasons for palliation were severe HS at time of presentation (two patients), anomalous coronary artery (one patient) and CI (one patient). In the 18 patients undergoing 1 degree repair, 3 (16.6%) presented with HS, 6 (33.3%) had a transanular repair, and 6 (33.3%) were able to be repaired through an entirely transatrial approach (youngest patient, 1.5 months). The HC (1996 dollars) and hospital length of stay (LOS; days) were evaluated for all patients. The HCs were calculated using transition I, which is a cost accounting system used by our medical center since July 1992. Transition I provides complete data on all direct and indirect hospital-based, nonprofessional costs. RESULTS There was no mortality in either group. The group undergoing 1 degree repair had an average LOS of 14.5 +/- 11.2 days compared to an average LOS for palliation of 14 +/- 6.4 days. When the palliated group returned for complete repair, the average LOS was 28.8 +/- 25 days, yielding a total LOS for the two-stage strategy of 43 +/- 30.8 days (p = 0.003 compared to 1 degree repair). The HC for 1 degree repair was $32,541 +/- $15,968 compared to $25,737 +/- $1900 for palliation (p = not significant compared to 1 degree repair) and $54,058 +/- $39,395 for subsequent complete repair (p = not significant compared to 1 degree repair) (total two-stage repair HC = $79,795 +/- $40,625; p = 0.001 compared to 1 degree repair). The LOS and HC for the two-stage group combine a total of palliation plus later repair and, as such, reflect two separate hospitalizations and convalescent periods. To eliminate cost outliers, a best-case analysis was performed by eliminating 50% of patients from each group. Using this analysis, the two-stage approach resulted in an average (total) LOS of 16.5 +/- 2.1 days compared to 8.5 +/- 1.4 days for the 1 degree group. Total cost for the two-stage strategy in this best-case group was $44,660 +/- $3645 compared to $22,360 +/- $3331 for 1 degree repair (p = 0.00001). CONCLUSIONS The data from this review show that palliation alone generates HC similar to that from 1 degree infant repair of TOF, and total combined HC and LOS for palliation plus eventual repair of TOF (two-stage approach) are significantly higher than from 1 degree repair. Furthermore, these data do not include additional costs for care delivered between palliation and repair (e.g., outpatient visits, cardiac catheterization, serial echocardiography). Although there may be occasions when a strategy using initial palliation followed by later repair may seem prudent, the cost is clearly higher and use of health care resources greater.
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Affiliation(s)
- R M Ungerleider
- Department of Surgery, Duke University Medical Center, Durham, NC, USA
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Cheifetz IM, Craig DM, Kern FH, Black DR, Hillman ND, Greeley WJ, Ungerleider RM, Smith PK, Meliones JN. Nitric oxide improves transpulmonary vascular mechanics but does not change intrinsic right ventricular contractility in an acute respiratory distress syndrome model with permissive hypercapnia. Crit Care Med 1996; 24:1554-61. [PMID: 8797631 DOI: 10.1097/00003246-199609000-00021] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [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: 02/02/2023]
Abstract
OBJECTIVE To test the hypothesis that in a swine model of acute respiratory distress syndrome (ARDS) with permissive hypercapnia, inhaled nitric oxide would improve transpulmonary vascular mechanics and right ventricular workload while not changing intrinsic right ventricular contractility. DESIGN Prospective, randomized, controlled laboratory trial. SETTING University research laboratory. SUBJECTS Eleven swine (30 to 46 kg). INTERVENTIONS The swine were anesthetized, intubated, and paralyzed. After median sternotomy, pressure transducers were placed in the right ventricle, pulmonary artery, and left atrium. An ultrasonic flow probe was placed around the pulmonary artery. Ultrasonic dimension transducers were sutured onto the heart at the base, apex, left ventricle (anterior, posterior, free wall), and right ventricle (free wall). An additional transducer was placed in the interventricular septum. A surfactant depletion model of ARDS was created by saline lung lavage. Nitric oxide was administered at 2, 4, and 6 parts per million (ppm), in a random order, under the condition of permissive hypercapnia (Paco2 55 to 75 torr [7.3 to 10.0 kPa]). MEASUREMENTS AND MAIN RESULTS We evaluated the pulmonary vascular and right ventricular effects of permissive hypercapnia, with and without inhaled nitric oxide, by measuring variables of transpulmonary vascular mechanics and right ventricular function. These variables included mean pulmonary arterial pressure, right ventricular total power, right ventricular stroke work, transpulmonary vascular efficiency, and right ventricular intrinsic contractility. Data were obtained after lung injury under the following conditions: a) normocapnia (Paco2 35 to 45 torr [4.7 to 6.0 kPa]) and nitric oxide at 0 ppm; b) hypercapnia and nitric oxide at 0 ppm; c) hypercapnia and nitric oxide at 2, 4, and 6 ppm; and d) repeat measurements with hypercapnia and nitric oxide at 0 ppm. In ARDS with permissive hypercapnia, inhaled nitric oxide therapy (2 to 6 ppm) improved transpulmonary vascular mechanics and right ventricular workload by lowering pulmonary arterial pressure (29.6 +/- 1.3 vs. 24.6 +/- 1.0 mm Hg, p = .0001), increasing transpulmonary vascular efficiency (13.9 +/- 0.5 vs. 16.1 +/- 0.7 L/W-min, p = .0001), decreasing right ventricular total power (142 +/- 9 vs. 115 +/- 9 mW, p = .001), and decreasing right ventricular stroke work (653 +/- 37 vs. 525 +/- 32 ergs x 10(3), p = .001). Inhaled nitric oxide did not change right ventricular contractility, as measured by preload-recruitable stroke work. CONCLUSIONS Inhaled nitric oxide ameliorated any negative effects of hypoxic and hypercapnic pulmonary vasoconstriction. The beneficial effects of inhaled nitric oxide are related to alterations in right ventricular afterload and not intrinsic right ventricular contractility. The improved cardiopulmonary effects of inhaled nitric oxide with permissive hypercapnia potentially expand the use of nitric oxide in ARDS and other conditions in which this strategy is employed.
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Affiliation(s)
- I M Cheifetz
- Department of Pediatrics, Duke Children's Hospital, Duke University Medical Center, Durham, NC 27710, USA
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Tsui SS, Kirshbom PM, Davies MJ, Jacobs MT, Greeley WJ, Kern FH, Gaynor JW, Ungerleider RM. Nitric oxide production affects cerebral perfusion and metabolism after deep hypothermic circulatory arrest. Ann Thorac Surg 1996; 61:1699-707. [PMID: 8651770 DOI: 10.1016/0003-4975(96)00197-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [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] [Indexed: 02/01/2023]
Abstract
BACKGROUND Use of deep hypothermic circulatory arrest (DHCA) in infant cardiac surgery is associated with reduced cerebral perfusion and metabolism during the recovery period. We investigated the impairment of nitric oxide production as a possible cause. METHODS A group of 1-week-old piglets underwent normothermic cardiopulmonary bypass (group A); three other groups (B, C, and D; n = 6 per group) underwent 60 minutes of DHCA at 18 degrees C and 60 minutes of rewarming. The animals were then treated as follows: Groups A and B received L-omega-nitro-arginine-methyl-ester (L-NAME, 50 mg.kg-1); group C, saline solution; and group D, L-arginine (600 mg.kg-1). RESULTS In group A, global cerebral blood flow decreased to 37.3% +/- 4.2% of baseline after L-NAME administration (p < 0.005). In group B, global cerebral blood flow decreased to 44.6% +/- 4.4% of baseline after DHCA and 28.9% +/- 3.4% after L-NAME administration (p < 0.001). Following L-arginine treatment after DHCA (group D), global cerebral blood flow increased from 43.8% +/- 3.0% of baseline to 61.6% +/- 9.1% (p < 0.05); cerebral oxygen metabolism increased from 1.93 +/- 0.16 mL.min-1.100 g-1 after DHCA to 2.42 +/- 0.25 mL.min-1.100 g-1 (p < 0.05). CONCLUSIONS Tonal production of nitric oxide is impaired in the brain after DHCA and is partly responsible for the circulatory and metabolic changes observed. Stimulation of nitric oxide production (L-arginine) significantly improved recovery of cerebral blood flow and cerebral oxygen metabolism after DHCA.
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Affiliation(s)
- S S Tsui
- Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA
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Trant CA, Casey JR, Hansell D, Cheifetz I, Meliones JN, Ungerleider RM, Browning I, Greeley WJ. Successful use of extracorporeal membrane oxygenation in the treatment of acute chest syndrome in a child with severe sickle cell anemia. ASAIO J 1996; 42:236-9. [PMID: 8725698] [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: 02/01/2023] Open
Abstract
Extracorporeal membrane oxygenation (ECMO) is widely used in the treatment of respiratory and cardiovascular failure in neonatal patients. The authors present a case of a child with hemoglobin SS disease who was treated with ECMO after acute chest syndrome and acute respiratory distress syndrome developed. They also present data from the Extracorporeal Life Support Organization on this use of ECMO from other centers. To date, there have been 15 pediatric patients with acute chest syndrome treated with ECMO. Survival rate has been 26%. In selected patients with severe disease, ECMO can provide support at a lower mean airway pressure, allow for aggressive pulmonary lavage, and maintain adequate tissue oxygen delivery until the patient is more stable. Patients who might benefit include those with poor ventilation secondary to mucous plugging and barotrauma. The best success with these patients might be anticipated from venoarterial ECMO. Patients with severe cardiac or neurologic deterioration may constitute a group less likely to survive.
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Affiliation(s)
- C A Trant
- Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, USA
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Stockwell JA, Goldstein RF, Ungerleider RM, Kern FH, Meliones JN, Greeley WJ. Cerebral blood flow and carbon dioxide reactivity in neonates during venoarterial extracorporeal life support. Crit Care Med 1996; 24:155-62. [PMID: 8565521 DOI: 10.1097/00003246-199601000-00025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 01/31/2023]
Abstract
OBJECTIVES a) To determine if cerebral blood flow is symmetric after internal carotid artery and ipsilateral internal jugular vein ligation in infants during venoarterial extracorporeal life support. b) To determine the cerebral CO2 reactivity (delta cerebral blood flow/delta torr CO2) of neonates during venoarterial extracorporeal life support and its correlation to neurodevelopmental outcome. DESIGN Prospective, clinical study. SETTING University hospital pediatric intensive care unit. PATIENTS Fourteen neonates with respiratory failure who were receiving venoarterial extracorporeal life support. INTERVENTIONS PaCO2 was altered by adjusting the CO2 gas flow through the membrane oxygenator. Cerebral blood flow was measured over both parietal-temporal regions at three PaCO2 values using xenon-133 clearance methodology. Cerebral blood flow measurements were made early (< or = 12 hrs of extracorporeal life support, n = 10) or late (> or = 48 hrs of extracorporeal life support, n = 10). In six of 14 infants, both early and late cerebral blood flow rates were measured. PaO2, mean arterial pressure, pump flow rate, and temperature were stable during each study period. Neurodevelopmental outcome was assessed in the neonatal follow-up clinic. MEASUREMENTS AND MAIN RESULTS Right and left hemispheric cerebral blood flow rates were significantly correlated with each other during early and late extracorporeal life support (p = .0001; r2 = .91). Overall, hemispheric cerebral blood flow was statistically symmetric. There was no association of CO2 reactivity (delta cerebral blood flow/delta torr PCO2, range 0.04 to 1.36 mL/min/100 g/torr) with short-term neurodevelopmental outcome. Infants with normal neurodevelopmental outcome had variable CO2 reactivity (range 0.04 to 0.67 mL/min/100 g/torr). Normal short-term neurodevelopmental outcome was observed in two infants with cerebral blood flow of < 10 mL/min/100 g. CONCLUSIONS Hemispheric cerebral blood flow was symmetric in infants during early and late venoarterial extracorporeal life support. Some subgroups showed a trend toward decreased right hemispheric cerebral blood flow, but the small number of patients limited interpretation of this finding. CO2 reactivity and cerebral blood flow were highly variable in this population, and were not predictive of short-term neurodevelopmental outcome. Stressed neonates with extremely low cerebral blood flow rates may have relatively normal short-term neurodevelopmental outcome after venoarterial extracorporeal life support.
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Affiliation(s)
- J A Stockwell
- Department of Pediatrics, University of Kentucky, Lexington 40536-0084, USA
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Kirshbom PM, Skaryak LR, DiBernardo LR, Kern FH, Greeley WJ, Gaynor JW, Ungerleider RM. pH-stat cooling improves cerebral metabolic recovery after circulatory arrest in a piglet model of aortopulmonary collaterals. J Thorac Cardiovasc Surg 1996; 111:147-55; discussion 156-7. [PMID: 8551760 DOI: 10.1016/s0022-5223(96)70411-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [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] [Indexed: 01/31/2023]
Abstract
Cardiopulmonary bypass with deep hypothermic circulatory arrest increases the risk of neurologic injury in patients with aortopulmonary collaterals. Experimental studies have demonstrated that such collaterals decrease the rate of cerebral cooling before arrest and cerebral metabolic recovery after circulatory arrest. Use of pH-stat blood gas management has been shown to increase cerebral blood flow during cooling. The current study was designed to test whether cooling with pH-stat blood gas management can decrease the cerebral metabolic impact of aortopulmonary collaterals. Twenty 4- to 6-week-old piglets underwent placement of a shunt between the left subclavian artery and main pulmonary artery. In control animals (n = 10) the shunts were immediately ligated, whereas in the shunt animals (n = 10) the shunts were left patent. All animals were supported with cardiopulmonary bypass, cooled to 18 degrees C by means of either alpha-stat (five control and five shunt animals) or pH-stat (five control and five shunt animals) blood gas management, subjected to circulatory arrest for 90 minutes, and rewarmed to 37 degrees C. The cerebral metabolic rate of oxygen consumption (a marker for neurologic function) was significantly lower after circulatory arrest in the shunt animals cooled with alpha-stat blood gas management than in the control animals subjected to alpha-stat management (1.2 +/- 0.2 vs 2.3 +/- 0.2 ml oxygen per 100 gm/min, p < 0.05). By contrast, there was no difference between the pH-stat shunt animals and either control group (2.1 +/- 0.2 vs 2.3 +/- 0.2 [alpha-stat] and 2.0 +/- 0.3 [pH-stat] ml oxygen per 100 gm/min, p = not significant). pH-Stat cooling protected the brain from shunt-related injury. When circulatory arrest is used in the presence of aortopulmonary collaterals, the use of pH-stat blood gas management during cooling results in better cerebral protection than alpha-stat blood gas management.
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Affiliation(s)
- P M Kirshbom
- Department of Surgery, Duke University Medical Center, Durham, N.C. 27710, USA
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Skaryak LA, Chai PJ, Kern FH, Greeley WJ, Ungerleider RM. Blood gas management and degree of cooling: effects on cerebral metabolism before and after circulatory arrest. J Thorac Cardiovasc Surg 1995; 110:1649-57. [PMID: 8523875 DOI: 10.1016/s0022-5223(95)70026-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.7] [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] [Indexed: 01/31/2023]
Abstract
This study investigated the effects of different cooling strategies on cerebral metabolic response to circulatory arrest. In particular, it examined the impact of blood gas management and degree of cooling on cerebral metabolism before and after deep hypothermic circulatory arrest. Sixty-nine 1-week-old piglets (2 to 3 kg) were placed on cardiopulmonary bypass (37 degrees C) at 100 ml/kg per minute. Animals were cooled to 18 degrees or 14 degrees C as follows: alpha-stat strategy to 18 degrees C (n = 9) or 14 degrees C (n = 6), pH-stat strategy to 18 degrees C (n = 12) or 14 degrees C (n = 10). Animals underwent 60 minutes of circulator arrest followed by rewarming with alpha-stat strategy to 36 degrees C. Control animals were cooled with alpha-stat strategy to 18 degrees C (n = 10) or 14 degrees C (n = 3) and then maintained on cold cardiopulmonary bypass (100 ml/kg per minute) for 60 minutes. Three animals were excluded (see text). With the use of xenon 133 clearance methods, cerebral blood flow was measured at the following points: point I, cardiopulmonary bypass (37 degrees C); point II, cardiopulmonary bypass before circulatory arrest or control flow (18 degrees or 14 degrees C); and point III, cardiopulmonary bypass after rewarming (36 degrees C). Cerebral metabolic rate of oxygen consumption was calculated for each point. At point II, cerebral metabolism was more suppressed at 14 degrees C compared with that at 18 degrees C. At any given temperature (18 degrees or 14 degrees C), pH-stat strategy provided the greatest suppression of of cerebral metabolism. In control animals, cerebral metabolic oxygen consumption of point III returned to baseline values after 60 minutes of cold bypass. Sixty minutes of circulatory arrest resulted in a significant reduction in cerebral metabolic oxygen consumption at point III compared with that at point I regardless of cooling temperature or blood gas strategy. The amount of cerebral metabolic recovery was significantly reduced in the pH-stat 14 degrees C group compared with that in the pH-stat 18 degrees C group at point III. The use of pH-stat strategy followed by a switch to alpha-stat at 14 degrees C provided better cerebral metabolic recovery compared with either strategy used alone. The use of pH-stat strategy during initial cooling may provide the animal with maximal cerebral metabolic suppression. The cerebral acidosis produced with pH-stat cooling may worsen cerebral metabolic injury from circulatory arrest, but this affect is eliminated with the use of alpha-stat just before the period of circulatory arrest.
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Affiliation(s)
- L A Skaryak
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
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Ungerleider RM, Kisslo JA, Greeley WJ, Li JS, Kanter RJ, Kern FH, Schulman SR, Nesmith JW, Gaynor JW, Bengur AR. Intraoperative Echocardiography During Congenital Heart Operations: Experience From 1,000 Cases. Ann Thorac Surg 1995. [DOI: 10.1016/s0003-4975(21)01193-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ungerleider RM, Kisslo JA, Greeley WJ, Li JS, Kanter RJ, Kern FH, Schulman SR, Nesmith JW, Gaynor JW, Bengur AR. Intraoperative echocardiography during congenital heart operations: experience from 1,000 cases. Ann Thorac Surg 1995; 60:S539-42. [PMID: 8604930 DOI: 10.1016/0003-4975(95)00853-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.7] [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] [Indexed: 01/31/2023]
Abstract
BACKGROUND This article provides an overview of the application of intraoperative echocardiography during repair of congenital heart defects based on our experience with 1,000 patients. METHODS The patients in this study all underwent repair of a congenital heart defect between 1987 and 1994 at Duke University Medical Center. Echocardiography was performed on all patients in the operating room both before and after repair using epicardial or transesophageal imaging (or both). Hospital costs and outcome data were obtained for all patients. RESULTS Overall, 44 patients (4.4%) underwent intraoperative revision of their repair based on echocardiographic findings. There was an initial learning phase during which 8.5% of repairs needed to be revised. With experience, the number of revisions fell to as low as 3% to 4%, but need for revision continued to occur throughout the series. Thirty-nine patients (88.6%) had a successful revision. It was not possible for the surgeon to predict the need for a revision based on his confidence in the repair: in 2.6% of patients thought by the surgeon to have a good repair, intraoperative echocardiography revealed the need for operative revision. The average cost for patients who return to the operating room during their hospitalization for revision of a repair is significantly greater than for those whose repairs are revised before they leave the operating room ($94,180.28 +/- $33,881.63 versus $21,415.79 +/- $8,215.74). There were no significant complication attributable to intraoperative echocardiography. CONCLUSIONS In an era where complete repair of congenital heart defects is emphasized, intraoperative echocardiography provides information that can guide successful operative revision so that babies leave the operating room with optimal results.
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Affiliation(s)
- R M Ungerleider
- Department of Surgery, Duke University Medical Center, Durham, North Carolina 27712, USA
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Grayck EN, Meliones JN, Kern FH, Hansell DR, Ungerleider RM, Greeley WJ. Elevated serum lactate correlates with intracranial hemorrhage in neonates treated with extracorporeal life support. Pediatrics 1995; 96:914-7. [PMID: 7478835] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
OBJECTIVES To correlate the initial and maximal lactate levels with the occurrence of intracranial hemorrhage (ICH) and survival in patients treated with extracorporeal life support (ECLS). DESIGN Retrospective chart review. SETTING Pediatric intensive care unit. PATIENTS Eighty-two neonatal patients placed on ECLS for respiratory failure due to sepsis, meconium aspiration, or persistent pulmonary hypertension of the newborn. MEASUREMENTS The initial lactate level measured within 6 hours of initiating ECLS and the maximal lactate level measured throughout the ECLS course were collected. Lactate levels were described as mean lactate +/- SE (mM). Head ultrasound reports and survival were reviewed. Platelet counts and activated clotting times (ACTs) were examined. RESULTS The mean initial and maximal lactate levels were higher in ECLS patients who developed ICH (initial: 10 +/- 1.7 mM vs 6.4 +/- 0.8 mM, p = .05 and maximal: 12.4 +/- 2.5 mM vs 7.9 +/- 0.8 mM, p = .04). Initial and maximal lactate levels were also elevated in nonsurvivors (initial: 11.7 +/- 3 mM vs 6.4 +/- 0.7 mM, p = .01 and maximal: 14.8 +/- 3.3 mM vs 7.8 +/- 0.8 mM, P < .01). Platelet counts and ACT did not differ in patients with and without ICH. CONCLUSIONS Lactate is a useful marker for the development of ICH in ECLS patients. In addition, elevated lactates during ECLS identify a subgroup of patients with poor outcome. Prospective studies are needed to determine whether the incorporation of this information into pre-ECLS and ECLS management will decrease the occurrence of ICH and improve survival.
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Affiliation(s)
- E N Grayck
- Department of Pediatrics, Duke University Medical Center, Durham, NC 27710, USA
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Kern FH, Ungerleider RM, Schulman SR, Meliones JN, Schell RM, Baldwin B, Hickey PR, Newman MF, Jonas RA, Greeley WJ. Comparing two strategies of cardiopulmonary bypass cooling on jugular venous oxygen saturation in neonates and infants. Ann Thorac Surg 1995; 60:1198-202. [PMID: 8526599 DOI: 10.1016/0003-4975(95)00700-u] [Citation(s) in RCA: 32] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Cerebral protection during deep hypothermic circulatory arrest is predicted on efficient and complete cerebral cooling. Institutions approach cooling quite differently. We compared two different cooling strategies in terms of measured jugular venous bulb saturations in 39 infants undergoing deep hypothermic cardiopulmonary bypass to evaluate the effect of institutional cooling practices on jugular venous bulb saturation, an indirect measure of cerebral cooling efficiency. METHODS The patients were grouped based on the method of core cooling. In group A (n = 17), core cooling was achieved rapidly by setting the water bath temperature of the heat exchanger at 4 degrees to 5 degrees C, and the patient was cooled until rectal temperature and nasopharyngeal temperature were 15 degrees C or lower. In group B (n = 22), the heat exchanger was initially set at 18 degrees C and slowly lowered to 12 degrees C. Hypothermic temperatures of 12 degrees C were maintained until the nasopharyngeal temperature was 18 degrees C or less and the rectal temperature was 20 degrees C or lower. Once cooling was complete, blood samples were analyzed by cooximetry for determination of arterial oxygen saturation and jugular venous bulb saturation. RESULTS In group A, the measured jugular venous bulb saturation was 98.0% +/- 0.9% and the oxygen saturation to jugular venous bulb saturation difference was 0.3% +/- 0.5%, measured at the time that institutional cooling objectives were achieved (total cooling time, 15.0 +/- 0.45 minutes). In group B, jugular venous bulb saturation was 86.2% +/- 12% and the oxygen saturation to jugular venous bulb saturation difference was 10.8% +/- 12.2%, measured at the time that institutional cooling objectives were achieved (total cooling time, 17.5 +/- 1.1 minutes (p < 0.01). CONCLUSIONS Differences in cardiopulmonary bypass cooling techniques may alter the rate at which jugular bulb saturations rise. We believe this represents an indirect measure of the efficiency of brain cooling and therefore of cerebral protection.
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Affiliation(s)
- F H Kern
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Chai PJ, Skaryak LA, Ungerleider RM, Greeley WJ, Kern FH, Schulman SR, Hansell DR, Auten RL, Mahaffey SF, Meliones JN. Jugular ligation does not increase intracranial pressure but does increase bihemispheric cerebral blood flow and metabolism. Crit Care Med 1995; 23:1864-71. [PMID: 7587263 DOI: 10.1097/00003246-199511000-00013] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 01/26/2023]
Abstract
OBJECTIVES To answer the following questions: a) Does jugular venous ligation (simulating venovenous extracorporeal life support) alter proximal jugular venous pressure, intracranial pressure, hemispheric cerebral blood flow, or cerebral metabolism? b) Does release of ligation reverse these effects? and c) What are the comparative effects of venous ligation alone vs. venous ligation in combination with arterial ligation? DESIGN Prospective, randomized, laboratory investigation. SETTING Multidisciplinary laboratory setting. SUBJECTS Sixteen swine, weighing 8.1 to 12.1 kg, 3 to 4 wks of age. INTERVENTIONS Sixteen swine were randomly assigned to two groups, utilizing a random sequence of vessel ligation. Nine swine underwent occlusion of the right internal and external jugular veins alone (venovenous ligation) followed by release of the occlusion and then occlusion of the right common carotid artery and the right internal and external jugular veins together (venoarterial ligation). The remaining seven swine underwent venoarterial ligation, followed by release of the occlusion and then venovenous ligation. In the experimental group in which venovenous ligation was performed first, the 5, and 30-min release periods after ligation were taken to represent the effects of draining the right jugular vein during venovenous extracorporeal life support. MEASUREMENTS AND MAIN RESULTS Data were obtained at baseline, 5, and 30 mins after each ligation/release period. Intracranial pressure, right and left internal jugular pressures/flow rates, and cerebral sinus lactate concentrations were measured. Cerebral blood flow was determined using 133Xe clearance methodology, and the cerebral metabolic rate was calculated. There were no significant differences between the ipsilateral internal jugular pressure or extracorporeal life support at 5 or 30 mins after venovenous or venoarterial ligation compared with baseline values or compared with the release of the ligation at 5 or 30 mins. There was a significant increase in right-side (44.7 +/- 2.0 vs. 38.8 +/- 2.4 mL/kg/min; p < .05) and left-side (42.9 +/- 2.3 vs. 38.7 +/- 1.9 mL/kg/min; p < .05) cerebral blood flow 5 mins after venovenous ligation when compared with baseline values. Similarly, after venoarterial ligation, there was a significant increase in right-side (44.6 +/- 2.2 vs. 38.8 +/- 2.4 mL/kg/min; p < .05) and left-side (43.9 +/- 1.5 vs. 38.7 +/- 1.9 mL/kg/min; p < .05) and cerebral blood flow. Cerebral oxygen consumption was significantly increased after venovenous (2.7 +/- 0.2 to 3.2 +/- 0.2 mL/kg/min; p < .05) and venoarterial (2.7 +/- 0.2 to 3.1 +/- 0.2 mL/kg/min; p < .05) ligation at 5 mins after ligation. This increase persisted at the 30-min period and after release of ligation. CONCLUSIONS Ligation of the right jugular veins alone (venovenous ligation) or jugular veins and right carotid artery (venoarterial ligation) does not increase jugular venous pressures or intracranial pressure. However, this procedure does increase cerebral blood flow and cerebral oxygen consumption. These findings demonstrate that there is adequate decompression of the venous system by the cerebrovascular system and retrograde decompression during extracorporeal life support appears unwarranted.
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Affiliation(s)
- P J Chai
- Department of Anesthesia, Duke Children's Hospital, Duke University Medical Center, Durham, NC, USA
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Kirshbom PM, Skaryak LA, DiBernardo LR, Kern FH, Greeley WJ, Gaynor JW, Ungerleider RM. Effects of aortopulmonary collaterals on cerebral cooling and cerebral metabolic recovery after circulatory arrest. Circulation 1995; 92:II490-4. [PMID: 7586460 DOI: 10.1161/01.cir.92.9.490] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [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] [Indexed: 01/26/2023]
Abstract
BACKGROUND Aortopulmonary collaterals (APC) have been associated with an increased risk of choreoathetosis after deep hypothermic circulatory arrest (DHCA). To study the effects of APC on cerebral hemodynamics and metabolism before and after DHCA, a piglet model was developed. METHODS AND RESULTS Protocol 1: Eight 4- to 6-week-old piglets underwent placement of a left subclavian-to-main pulmonary artery shunt. Control shunts (n = 4) were ligated, APC shunts (n = 4) were left patent. All animals were placed on cardiopulmonary bypass (CPB) and cooled in identical fashion for 20 minutes. Temperature probes were placed in the nasopharynx, cortex, and deep brain. Control animals achieved significantly lower temperatures in all three areas by the end of cooling (17.5 degrees C versus 20.1 degrees C, 19.0 degrees C versus 22.3 degrees C, and 17.5 degrees C versus 21.0 degrees C, respectively, P < .005). Protocol 2: Six control and six APC animals were instrumented as described. All were placed on CPB, cooled to 18 degrees C, arrested for 90 minutes, and rewarmed to 37 degrees C. Cerebral blood flow (CBF) was measured with radioactive microspheres while warm on CPB, after cooling, and after rewarming. Arterial and sagittal sinus blood gases and CBF were used to calculate the cerebral metabolic rate of oxygen consumption (CMRO2). Both CBF and CMRO2 were significantly higher after rewarming to 37 degrees C in control versus APC animals (28 +/- 3 versus 14 +/- 2 mL/100 g per minute and 1.72 +/- 0.21 versus 1.04 +/- 0.14 mL O2/100 g per minute, respectively, P < .05). CONCLUSIONS APC decrease the rate of cerebral cooling on CPB and even if temperature is controlled result in increased cerebral metabolic derangement after DHCA. Patients with such collaterals may need additional measures to optimize cerebral protection.
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Affiliation(s)
- P M Kirshbom
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
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Affiliation(s)
- F H Kern
- Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA
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Skaryak LA, Kirshbom PM, DiBernardo LR, Kern FH, Greeley WJ, Ungerleider RM, Gaynor JW. Modified ultrafiltration improves cerebral metabolic recovery after circulatory arrest. J Thorac Cardiovasc Surg 1995; 109:744-51; discussion 751-2. [PMID: 7715223 DOI: 10.1016/s0022-5223(95)70357-8] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.4] [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] [Indexed: 01/26/2023]
Abstract
Modified ultrafiltration uses hemofiltration of the patient and bypass circuit after separation from cardiopulmonary bypass to reverse hemodilution and edema. This study investigated the effect of modified ultrafiltration on cerebral metabolic recovery after deep hypothermic circulatory arrest. Twenty-six 1-week-old piglets (2 to 3 kg) were supported by cardiopulmonary bypass (37 degrees C) at 100 ml.kg-1.min-1 and cooled to 18 degrees C. Animals underwent 90 minutes of circulatory arrest followed by rewarming to 37 degrees C. After being weaned from cardiopulmonary bypass, animals were divided into three groups: controls (n = 10); modified ultrafiltration for 20 minutes (n = 9); transfusion of hemoconcentrated blood for 20 minutes (n = 7). Global cerebral blood flow was measured by xenon 133 clearance methods: stage I--before cardiopulmonary bypass; stage II--5 minutes after cardiopulmonary bypass; and stage III--25 minutes after cardiopulmonary bypass. Cerebral metabolic rate of oxygen consumption, cerebral oxygen delivery, and hematocrit value were calculated for each time point. At point III, the hematocrit value (percent) was elevated above baseline in the ultrafiltration and transfusion groups (44 +/- 1.8, 42 +/- 1.8 versus 28 +/- 1.7, 30 +/- 0.7, respectively, p < 0.05). Cerebral oxygen delivery (ml.100 gm-1.min-1) increased significantly above baseline at point III after ultrafiltration (4.98 +/- 0.32 versus 3.85 +/- 0.16, p < 0.05) or transfusion (4.59 +/- 0.17 versus 3.89 +/- 0.06, p < 0.05) and decreased below baseline in the control group (2.77 +/- 0.19 versus 3.81 +/- 0.16, p < 0.05). Ninety minutes of deep hypothermic circulatory arrest resulted in impaired cerebral metabolic oxygen consumption (ml.100 gm-1.min-1) at point III in the control group (1.95 +/- 0.15 versus 2.47 +/- 0.07, p < 0.05) and transfusion group (1.72 +/- 0.10 versus 2.39 +/- 0.15, p < 0.05). After modified ultrafiltration, however, cerebral metabolic oxygen consumption at point III had increased significantly from baseline (3.12 +/- 0.24 versus 2.48 +/- 0.13, p < 0.05), indicating that the decrease in cerebral metabolism immediately after deep hypothermic circulatory arrest is reversible and may not represent permanent cerebral injury. Use of modified ultrafiltration after cardiopulmonary bypass may reduce brain injury associated with deep hypothermic circulatory arrest.
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Affiliation(s)
- L A Skaryak
- Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA
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