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Allon M, Lee T. A Requiem for Fistula First. J Am Soc Nephrol 2024:00001751-990000000-00276. [PMID: 38557800 DOI: 10.1681/asn.0000000000000346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024] Open
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Timmy Lee
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
- Veterans Affairs Medical Center, Birmingham, Alabama
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Allon M, Cutter GR, Young CJ. Vascular Access-Related Distal Ischemia Requiring Intervention: Frequency, Risk Factors, and Consequences. Clin J Am Soc Nephrol 2023; 18:1592-1598. [PMID: 37707801 PMCID: PMC10723913 DOI: 10.2215/cjn.0000000000000310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 09/11/2023] [Indexed: 09/15/2023]
Abstract
BACKGROUND Distal ischemia is a rare complication in patients undergoing placement of an arteriovenous (AV) fistula or AV graft. There are limited studies on its frequency, risk factors, clinical consequences, or feasibility of subsequent access. METHODS A prospective vascular access database from a large academic medical center was queried retrospectively to identify 1498 patients (mean age 56±15 years, 48% female patients, 73% Black patients) undergoing placement of at least one vascular access from 2011 to 2020. For patients who developed access-related distal ischemia requiring surgical intervention, we determined the frequency of distal ischemia, clinical risk factors, and subsequent outcomes. RESULTS Severe access-related distal ischemia occurred in 28 patients (1.9%; 95% confidence interval, 1.3% to 2.7%). The frequency was 0.2% for forearm AV fistulas, 0.9% for upper arm AV fistulas, 2.4% for forearm AV grafts, 2.2% for upper arm AV grafts, and 2.8% for thigh AV grafts. Risk factors independently associated with distal ischemia included female sex (odds ratio [OR], 3.64 [95% confidence interval, 1.52 to 8.72]), peripheral vascular disease (OR, 6.28 [2.84 to 13.87]), and coronary artery disease (OR, 2.37 [1.08 to 5.23]). Surgical interventions included ligation, excision, plication (banding), and other surgical procedures. Five patients developed tissue necrosis. A subsequent AV graft was placed in 13 patients, of whom only one (8%) developed distal ischemia requiring intervention. CONCLUSIONS Access-related distal ischemia requiring intervention was rare in this study and more common in women and patients with peripheral vascular disease or coronary artery disease. In some cases, a subsequent vascular access could be placed with a low likelihood of recurrent distal ischemia.
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gary R. Cutter
- Department of Public Health, University of Alabama at Birmingham, Birmingham, Alabama
| | - Carlton J. Young
- Division of Transplant Surgery, University of Alabama at Birmingham, Birmingham, Alabama
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Murea M, Allon M. The reasons for comparative effectiveness clinical trials of arteriovenous fistula versus graft strategy in older adults on hemodialysis with a catheter. Clin Nephrol 2023; 100:243-248. [PMID: 37877300 PMCID: PMC10795491 DOI: 10.5414/cn111227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 11/09/2023] [Indexed: 10/26/2023] Open
Abstract
Clinicians and patients are guided by observational studies to make one of the most consequential decisions for patients with advanced kidney disease: the selection of the "right" hemodialysis vascular access. More than a decade ago, a call for randomized clinical trials was made to equitably compare clinical outcomes between arteriovenous (AV) fistulas (AVFs) and AV grafts (AVGs). Mounting evidence suggests that trade-offs between AVF- and AVGrelated outcomes are context dependent. In this article, we summarize four streams of evidence that collectively underpin the burden of equipoise between the two types of AV access in older adults with comorbidities who are on hemodialysis with a central venous catheter.
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Affiliation(s)
- Mariana Murea
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, NC, and
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA
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Allon M, Al-Balas A, Young CJ, Cutter GR, Lee T. Predialysis Vascular Access Placement and Catheter Use at Hemodialysis Initiation. Clin J Am Soc Nephrol 2023; 19:01277230-990000000-00262. [PMID: 37843844 PMCID: PMC10843203 DOI: 10.2215/cjn.0000000000000317] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 10/09/2023] [Indexed: 10/17/2023]
Abstract
BACKGROUND Current guidelines encourage placement of an arteriovenous (AV) fistula in patients with advanced CKD to avoid initiation of hemodialysis with a central venous catheter. However, the relative merits of predialysis placement of an AV fistula or graft have been poorly studied. METHODS This study included 380 patients (mean age 59±14 years, 73% Black patients, 51% male) from a large academic medical center who underwent predialysis placement of an AV fistula (286) or AV graft (94). The study quantified three end points: time from access placement to initiation of dialysis, likelihood of starting hemodialysis without a catheter, and number of vascular access procedures before dialysis initiation. RESULTS The eGFR at access surgery was <10, 10-14, and ≥15 ml/min per 1.73 m 2 in 87 (23%), 179 (47%), and 114 (30%) patients, respectively. The median time from access surgery to hemodialysis initiation was 69, 156, and 429 days in patients with an eGFR of <10, 10-14, and ≥15 ml/min per 1.73 m 2 , respectively ( P < 0.001). Hemodialysis was initiated within 2 years of access surgery in 298 (78%) of the patients. Catheter-free hemodialysis initiation was higher in patients with an AV graft versus an AV fistula when the eGFR was <10 ml/min per 1.73 m 2 (88% versus 43%; odds ratio [OR], 9.10 [95% confidence interval, 2.74 to 26.4]) and when the eGFR was 10-14 ml/min per 1.73 m 2 (88% versus 54%; OR, 6.05 [2.35 to 15.0]) but similar when the eGFR was ≥15 ml/min per 1.73 m 2 (90% versus 75%; OR, 3.00 [0.48 to 34.9]). Patients undergoing an AV fistula were more likely to undergo an angioplasty (11% versus 0%, P < 0.001), surgical access revision (26% versus 8%, P < 0.001), a second access placement (16% versus 6%, P = 0.02), and a catheter insertion (32% versus 11%, P < 0.001). CONCLUSIONS Among patients with CKD undergoing vascular access surgery when their eGFR was <15 ml/min per 1.73 m 2 , catheter use at dialysis initiation was much less likely when an AV graft, rather than an AV fistula, was placed.
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Carlton J. Young
- Division of Transplant Surgery, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gary R. Cutter
- Department of Public Health, University of Alabama at Birmingham, Birmingham, Alabama
| | - Timmy Lee
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
- Veterans Affairs Medical Center, University of Alabama at Birmingham, Birmingham, Alabama
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Allon M, Al-Balas A, Young CJ, Cutter GR, Lee T. Effects of a More Selective Arteriovenous Fistula Strategy on Vascular Access Outcomes. J Am Soc Nephrol 2023; 34:1589-1600. [PMID: 37401775 PMCID: PMC10482060 DOI: 10.1681/asn.0000000000000174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/31/2023] [Indexed: 07/05/2023] Open
Abstract
SIGNIFICANCE STATEMENT The optimal choice of vascular access for patients undergoing hemodialysis-arteriovenous fistula (AVF) or arteriovenous graft (AVG)-remains controversial. In a pragmatic observational study of 692 patients, the authors found that among patients who initiated hemodialysis with a central vein catheter (CVC), a strategy that maximized AVF placement resulted in a higher frequency of access procedures and greater access management costs for patients who initially received an AVF than an AVG. A more selective policy that avoided AVF placement if an AVF was predicted to be at high risk of failure resulted in a lower frequency of access procedures and access costs in patients receiving an AVF versus an AVG. These findings suggest that clinicians should be more selective in placing AVFs because this approach improves vascular access outcomes. BACKGROUND The optimal choice of initial vascular access-arteriovenous fistula (AVF) or graft (AVG)-remains controversial, particularly in patients initiating hemodialysis with a central venous catheter (CVC). METHODS In a pragmatic observational study of patients who initiated hemodialysis with a CVC and subsequently received an AVF or AVG, we compared a less selective vascular access strategy of maximizing AVF creation (period 1; 408 patients in 2004 through 2012) with a more selective policy of avoiding AVF creation if failure was likely (period 2; 284 patients in 2013 through 2019). Prespecified end points included frequency of vascular access procedures, access management costs, and duration of catheter dependence. We also compared access outcomes in all patients with an initial AVF or AVG in the two periods. RESULTS An initial AVG placement was significantly more common in period 2 (41%) versus period 1 (28%). Frequency of all access procedures per 100 patient-years was significantly higher in patients with an initial AVF than an AVG in period 1 and lower in period 2. Median annual access management costs were significantly higher among patients with AVF ($10,642) versus patients with AVG ($6810) in period 1 but significantly lower in period 2 ($5481 versus $8253, respectively). Years of catheter dependence per 100 patient-years was three-fold higher in patients with AVF versus patients with AVG in period 1 (23.3 versus 8.1, respectively), but only 30% higher in period 2 (20.8 versus 16.0, respectively). When all patients were aggregated, the median annual access management cost was significantly lower in period 2 ($6757) than in period 1 ($9781). CONCLUSIONS A more selective approach to AVF placement reduces frequency of vascular access procedures and cost of access management.
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Carlton J. Young
- Division of Transplant Surgery, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gary R. Cutter
- Department of Public Health, University of Alabama at Birmingham, Birmingham, Alabama
| | - Timmy Lee
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
- Veterans Affairs Medical Center, University of Alabama at Birmingham, Birmingham, Alabama
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Allon M, Zhang Y, Thamer M, Crews DC, Lee T. Trends in Vascular Access Among Patients Initiating Hemodialysis in the US. JAMA Netw Open 2023; 6:e2326458. [PMID: 37526939 PMCID: PMC10394578 DOI: 10.1001/jamanetworkopen.2023.26458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/02/2023] Open
Affiliation(s)
- Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham
| | - Yi Zhang
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Deidra C Crews
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham
- Division of Nephrology, Veterans Affairs Medical Center, Birmingham, Alabama
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Villar L, Tralik B, Diamond MP, Allon M, Maldonado I, Dozortsev DI. Ovulation and birth after administration of progesterone trigger-two case reports. J Assist Reprod Genet 2023; 40:1037-1044. [PMID: 36808579 PMCID: PMC10239420 DOI: 10.1007/s10815-023-02750-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 02/07/2023] [Indexed: 02/23/2023] Open
Abstract
PURPOSE To determine whether using progesterone as a trigger of a gonadotropin surge will induce ovulation and a competent corpus luteum. METHODS Patients were administered 5 or 10 mg of progesterone intramuscularly when the leading follicle reached preovulatory size. RESULTS We demonstrate that progesterone injections result in classical ultrasonographic hallmarks of ovulation about 48 h later and the formation of a corpus luteum competent to support pregnancy. CONCLUSION Our results support further exploration of using progesterone to trigger a gonadotropin surge in assisted human reproduction.
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Affiliation(s)
- Lina Villar
- CITMER Medicina Reproductiva, Mexico City, Mexico
| | - Beata Tralik
- Advanced Fertility Center of Texas, Houston, TX, USA
| | - Michael P Diamond
- Department of Obstetrics and Gynecology, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Michael Allon
- Advanced Fertility Center of Texas, Houston, TX, USA
| | | | - Dmitri I Dozortsev
- CITMER Medicina Reproductiva, Mexico City, Mexico.
- Advanced Fertility Center of Texas, Houston, TX, USA.
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Murea M, Gardezi AI, Goldman MP, Hicks CW, Lee T, Middleton JP, Shingarev R, Vachharajani TJ, Woo K, Abdelnour LM, Bennett KM, Geetha D, Kirksey L, Southerland KW, Young CJ, Brown WM, Bahnson J, Chen H, Allon M. Study protocol of a randomized controlled trial of fistula vs. graft arteriovenous vascular access in older adults with end-stage kidney disease on hemodialysis: the AV access trial. BMC Nephrol 2023; 24:43. [PMID: 36829135 PMCID: PMC9960188 DOI: 10.1186/s12882-023-03086-5] [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] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 02/13/2023] [Indexed: 02/26/2023] Open
Abstract
BACKGROUND Treatment of end-stage kidney disease (ESKD) with hemodialysis requires surgical creation of an arteriovenous (AV) vascular access-fistula (AVF) or graft (AVG)-to avoid (or limit) the use of a central venous catheter (CVC). AVFs have long been considered the first-line vascular access option, with AVGs as second best. Recent studies have suggested that, in older adults, AVGs may be a better strategy than AVFs. Lacking evidence from well-powered randomized clinical trials, integration of these results into clinical decision making is challenging. The main objective of the AV Access Study is to compare, between the two types of AV access, clinical outcomes that are important to patients, physicians, and policy makers. METHODS This is a prospective, multicenter, randomized controlled trial in adults ≥ 60 years old receiving chronic hemodialysis via a CVC. Eligible participants must have co-existing cardiovascular disease, peripheral arterial disease, and/or diabetes mellitus; and vascular anatomy suitable for placement of either type of AV access. Participants are randomized, in a 1:1 ratio, to a strategy of AVG or AVF creation. An estimated 262 participants will be recruited across 7 healthcare systems, with average follow-up of 2 years. Questionnaires will be administered at baseline and semi-annually. The primary outcome is the rate of CVC-free days per 100 patient-days. The primary safety outcome is the cumulative incidence of vascular access (CVC or AV access)-related severe infections-defined as access infections that lead to hospitalization or death. Secondary outcomes include access-related healthcare costs and patients' experiences with vascular access care between the two treatment groups. DISCUSSION In the absence of studies using robust and unbiased research methodology to address vascular access care for hemodialysis patients, clinical decisions are limited to inferences from observational studies. The goal of the AV Access Study is to generate evidence to optimize vascular access care, based on objective, age-specific criteria, while incorporating goals of care and patient preference for vascular access type in clinical decision-making. TRIAL REGISTRATION This study is being conducted in accordance with the tenets of the Helsinki Declaration, and has been approved by the central institutional review board (IRB) of Wake Forest University Health Sciences (approval number: 00069593) and local IRB of each participating clinical center; and was registered on Nov 27, 2020, at ClinicalTrials.gov (NCT04646226).
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Affiliation(s)
- Mariana Murea
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, NC, USA. .,Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Ali I Gardezi
- Division of Nephrology, Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Mathew P Goldman
- Department of Vascular and Endovascular Surgery, Wake Forest School of Medicine, Winston- Salem, NC, USA
| | - Caitlin W Hicks
- Department of Surgery, Division of Vascular Surgery and Endovascular Therapy, Johns Hopkins University School of Medicine, 600 N Wolfe St, Halsted 668, Baltimore, MD, USA
| | - Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.,Division of Nephrology, Birmingham Veterans Affairs Medical Center, Birmingham, AL, USA
| | - John P Middleton
- Division of Nephrology, Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Roman Shingarev
- Department of Kidney Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Tushar J Vachharajani
- Department of Kidney Medicine, Glickman Urological & Kidney Institute, Cleveland Clinic Lerner College of Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Karen Woo
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Lama M Abdelnour
- Department of Medicine, Division of Nephrology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Kyla M Bennett
- Division of Vascular Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Duvuru Geetha
- Division of Nephrology, Department of Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Lee Kirksey
- Department of Vascular Surgery, Cleveland Clinic, Cleveland, OH, USA
| | - Kevin W Southerland
- Division of Vascular & Endovascular Surgery, Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | - Carlton J Young
- Department of Surgery, University of Alabama at Birmingham, Birmingham, AL, USA
| | - William M Brown
- Department of Biostatistics and Data Science, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Judy Bahnson
- Department of Biostatistics and Data Science, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Haiying Chen
- Department of Biostatistics and Data Science, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA. .,Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, USA.
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Allon M, Juncos LA, Perazella MA. Reproducibility in Research: The Role of Kidney360. Kidney360 2023; 4:121-125. [PMID: 36821600 PMCID: PMC10103247 DOI: 10.34067/kid.0000000000000040] [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] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 12/19/2022] [Indexed: 02/24/2023]
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Luis A. Juncos
- Division of Nephrology, Central Arkansas Veterans Healthcare System, Little Rock, Arkansas
| | - Mark A. Perazella
- Division of Nephrology, Yale University School of Medicine, New Haven, Connecticut
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10
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Allon M. A Midterm Analysis of Kidney360. Kidney360 2023; 4:1-3. [PMID: 36700895 PMCID: PMC10101552 DOI: 10.34067/kid.0000000000000021] [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] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 11/30/2022] [Indexed: 01/27/2023]
Affiliation(s)
- Michael Allon
- University of Alabama at Birmingham, Birmingham, Alabama
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11
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Zhang Y, Thamer M, Lee T, Crews DC, Allon M. Racial disparities in arteriovenous fistula use among hemodialysis patients: the role of surgeon supply. Kidney Int Rep 2022; 7:1575-1584. [PMID: 35812267 PMCID: PMC9263254 DOI: 10.1016/j.ekir.2022.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 03/09/2022] [Accepted: 04/04/2022] [Indexed: 11/04/2022] Open
Abstract
Introduction Factors contributing to racial disparities in arteriovenous fistula (AVF) use among hemodialysis (HD) patients remain poorly defined. We evaluated whether the Black/White race disparity in AVF use is affected by vascular access surgeon supply. Methods Using Consolidated Renal Operations in a Web-Enabled Network (CROWNWeb) and Medicare claims data from the US Renal Data System (USRDS), competing risk analyses of all US patients initiating HD with a central venous catheter (CVC) from 2016 to 2017 (n = 100,227) were performed. The likelihood of successful AVF use was compared between Black and White patients after adjusting for vascular access surgeon supply. Results Compared with the first (lowest) quartile of surgeon supply, higher supply levels were associated with modestly increased adjusted likelihoods of overall AVF use: 4% (95% CI 1.4%–7.2%), 4% (95% CI 1.4%–7.1%), and 3% (0.0%–6.1%) for second, third, and fourth quartiles, respectively. Although areas with lower surgeon supply had a higher proportion of Black patients, residing in areas with a greater surgeon supply was not significantly associated with a mitigation in racial disparity. Specifically, compared with White patients, Black patients were 10% (95% CI 7%–13%) and 8% (95% CI 5%–11%) less likely to have successful AVF use in lower and higher surgeon supply areas, respectively. Conclusion Regions with lower surgeon supply had a higher proportion of Black dialysis patients. However, racial disparities in AVF use among patients initiating HD with a CVC were similar in regions with a high and low surgeon supply. Other patient, provider, and practice factors should be evaluated toward mitigating lower rates of AVF use among Black HD patients.
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Al-Balas A, Almehmi A, Varma R, Al-Balas H, Allon M. De Novo Central Vein Stenosis in Hemodialysis Patients Following Initial Tunneled Central Vein Catheter Placement. Kidney360 2021; 3:99-102. [PMID: 35368564 PMCID: PMC8967595 DOI: 10.34067/kid.0005202021] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/11/2021] [Indexed: 01/12/2023]
Abstract
Background Central vein stenosis (CVS) is a common complication in hemodialysis patients following tunneled central venous catheter (CVC) insertion. Little is known about its incidence, association with patient characteristics, or relationship with duration of CVC placement. We systematically evaluated central vein stenosis in hemodialysis patients receiving their first CVC exchange at a large medical center. Methods All new hemodialysis patients underwent an ultrasound before their internal jugular tunneled CVC placement, to exclude venous stenosis or thrombosis. After the initial CVC insertion, if the patients were referred for CVC exchange due to dysfunction, a catheterogram/venogram was performed to assess for hemodynamically significant (≥50%) central vein stenosis. During a 5-year period (January 2016 to January 2021), we quantified the incidence of CVS in patients undergoing CVC exchange. We also evaluated the association of central vein stenosis with patient demographics, comorbidities, and duration of CVC dependence before exchange. Results During the study period, 273 patients underwent exchange of a tunneled internal jugular vein CVC preceded by a catheterogram/venogram. Hemodynamically significant CVS was observed in 36 patients (13%). CVS was not associated with patient age, sex, race, diabetes, hypertension, coronary artery disease, peripheral artery disease, or CVC laterality. However, the frequency of CVS was associated with the duration of CVC dependence (26% versus 11% for CVC duration ≥6 versus <6 months: odds ratio (95% CI), 3.17 (1.45 to 6.97), P=0.003). Conclusions Among incident hemodialysis patients receiving their first tunneled internal jugular CVC exchange, the overall incidence of de novo hemodynamically significant central vein stenosis was 13%. The likelihood of CVS was substantially greater in patients with at least 6 months of CVC dependence.
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Affiliation(s)
- Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Alabama,Division of Interventional Radiology, University of Alabama at Birmingham, Alabama
| | - Ammar Almehmi
- Division of Nephrology, University of Alabama at Birmingham, Alabama,Division of Interventional Radiology, University of Alabama at Birmingham, Alabama
| | - Rakesh Varma
- Division of Interventional Radiology, University of Alabama at Birmingham, Alabama
| | - Hassan Al-Balas
- Division of Interventional Radiology, Baylor College of medicine, Houston, Texas,Division of Radiology, Jordan University of Science & Technology, Irbid, Jordan
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Alabama
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13
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Al-Balas A, Varma R, Sharbidre K, Al-Balas H, Almehmi A, Abdel Aal AK, Robbin ML, Allon M. Feasibility of Creation of an Endovascular Arteriovenous Fistula in Patients Undergoing Preoperative Vascular Mapping. Kidney360 2021; 3:287-292. [PMID: 35373141 PMCID: PMC8967643 DOI: 10.34067/kid.0004242021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 10/14/2021] [Indexed: 01/10/2023]
Abstract
Background The first endovascular arteriovenous fistula (endoAVF) device (WavelinQ), a novel percutaneous technique of AVF creation, was approved by the Food and Drug Administration in 2018 and has been placed in a small number of United States patients on hemodialysis. It is unknown how often patients with advanced CKD have vascular anatomy suitable for WavelinQ creation. The goal of this study was to determine the proportion of patients with vascular anatomy suitable for WavelinQ creation and to assess patient characteristics associated with such suitability. Methods All patients referred for vascular access placement at a large academic medical center underwent standardized preoperative sonographic vascular mapping to assess suitability for an AVF. During a 2-year period (March 2019 to March 2021), we assessed the suitability of the vessels for creation of WavelinQ. We then compared the demographic characteristics, comorbidities, and vascular mapping measurements between patients who were or were not suitable for WavelinQ. Results During the study period, 437 patients underwent vessel mapping. Of these, 51% of patients were eligible for a surgical AVF, and 32% were eligible for a WavelinQ AVF; 63% of those suitable for a surgical AVF were also suitable for a WavelinQ AVF. Patients with a vascular anatomy suitable for WavelinQ were younger (age 55±15 versus 60±14 years, P=0.01) but similar in sex, race, diabetes, hypertension, coronary artery disease, and peripheral artery disease. Conclusions Among patients with CKD with vascular anatomy suitable for a surgical AVF, 63% are also suitable for a WavelinQ endoAVF. Older patients are less frequently suitable for WavelinQ.
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Affiliation(s)
- Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama,Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Rakesh Varma
- Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Kedar Sharbidre
- Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Hassan Al-Balas
- Division of Interventional Radiology, Baylor College of Medicine, Houston, Texas,Division of Radiology, Jordan University of Science & Technology, Irbid, Jordan
| | - Ammar Almehmi
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama,Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Ahmed Kamel Abdel Aal
- Division of Interventional Radiology, University of Texas at Houston, Houston, Texas
| | - Michelle L. Robbin
- Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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14
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Huber TS, Berceli SA, Scali ST, Neal D, Anderson EM, Allon M, Cheung AK, Dember LM, Himmelfarb J, Roy-Chaudhury P, Vazquez MA, Alpers CE, Robbin ML, Imrey PB, Beck GJ, Farber AM, Kaufman JS, Kraiss LW, Vongpatanasin W, Kusek JW, Feldman HI. Arteriovenous Fistula Maturation, Functional Patency, and Intervention Rates. JAMA Surg 2021; 156:1111-1118. [PMID: 34550312 DOI: 10.1001/jamasurg.2021.4527] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Importance National initiatives have emphasized the use of autogenous arteriovenous fistulas (AVFs) for hemodialysis, but their purported benefits have been questioned. Objective To examine AVF usability, longer-term functional patency, and remedial procedures to facilitate maturation, manage complications, or maintain patency in the Hemodialysis Fistula Maturation (HFM) Study. Design, Setting, and Participants The HFM Study was a multicenter (n = 7) prospective National Institutes of Health National Institute of Diabetes and Digestive and Kidney Diseases cohort study performed to identify factors associated with AVF maturation. A total of 602 participants were enrolled (dialysis, kidney failure: 380; predialysis, chronic kidney disease [CKD]: 222) with AVF maturation ascertained for 535 (kidney failure, 353; CKD, 182) participants. Interventions All clinical decisions regarding AVF management were deferred to the individual centers, but remedial interventions were discouraged within 6 weeks of creation. Main Outcomes and Measures In this case series analysis, the primary outcome was unassisted maturation. Functional patency, freedom from intervention, and participant survival were summarized using Kaplan-Meier analysis. Results Most participants evaluated (n = 535) were men (372 [69.5%]) and had diabetes (311 [58.1%]); mean (SD) age was 54.6 (13.6) years. Almost two-thirds of the AVFs created (342 of 535 [64%]) were in the upper arm. The AVF maturation rates for the kidney failure vs CKD participants were 29% vs 10% at 3 months, 67% vs 38% at 6 months, and 76% vs 58% at 12 months. Several participants with kidney failure (133 [37.7%]) and CKD (63 [34.6%]) underwent interventions to facilitate maturation or manage complications before maturation. The median time from access creation to maturation was 115 days (interquartile range [IQR], 86-171 days) but differed by initial indication (CKD, 170 days; IQR, 113-269 days; kidney failure, 105 days; IQR, 81-137 days). The functional patency for the AVFs that matured at 1 year was 87% (95% CI, 83.2%-90.2%) and at 2 years, 75% (95% CI, 69.7%-79.7%), and there was no significant difference for those receiving interventions before maturation. Almost half (188 [47.5%]) of the AVFs that matured had further intervention to maintain patency or treat complications. Conclusions and Relevance The findings of this study suggest that AVF remains an accepted hemodialysis access option, although both its maturation and continued use require a moderate number of interventions to maintain patency and treat the associated complications.
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Affiliation(s)
- Thomas S Huber
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville
| | - Scott A Berceli
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville
| | - Salvatore T Scali
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville
| | - Dan Neal
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville
| | - Erik M Anderson
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham
| | - Alfred K Cheung
- Nephrology and Hypertension Division, University of Utah School of Medicine, Salt Lake City
| | - Laura M Dember
- Renal, Electrolyte and Hypertension Division, University of Pennsylvania Perelman School of Medicine, Philadelphia
| | - Jonathan Himmelfarb
- Kidney Research Institute, Division of Nephrology, University of Washington, Seattle
| | | | - Miguel A Vazquez
- Division of Nephrology, University of Texas Southwestern, Dallas
| | | | | | - Peter B Imrey
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Gerald J Beck
- Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, Ohio
| | - Alik M Farber
- Division of Vascular and Endovascular Surgery, Boston Medical Center, Boston, Massachusetts
| | - James S Kaufman
- Renal Section, Veterans Affairs New York Harbor Healthcare System, New York
| | - Larry W Kraiss
- Division of Vascular Surgery, University of Utah, Salt Lake City
| | | | - John W Kusek
- Division of Kidney, Urologic, and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
| | - Harold I Feldman
- Renal, Electrolyte and Hypertension Division, University of Pennsylvania Perelman School of Medicine, Philadelphia.,Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia
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15
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Farrington CA, Cutter G, Allon M. Arteriovenous Fistula Nonmaturation: What's the Immune System Got to Do with It? Kidney360 2021; 2:1743-1751. [PMID: 35373006 PMCID: PMC8785854 DOI: 10.34067/kid.0003112021] [Citation(s) in RCA: 1] [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] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 09/14/2021] [Indexed: 02/04/2023]
Abstract
Background Arteriovenous fistula (AVF) nonmaturation is a persistent problem, particularly among female and Black patients. Increasingly, the immune system has been recognized as an important contributor to vascular disease, but few studies have examined immune factors relative to AVF maturation outcomes. This study evaluated the association of serum panel reactive antibodies (PRA), a measure of immune system reactivity assessed in patients undergoing kidney transplant evaluation, with AVF nonmaturation. Methods We identified 132 patients at our institution who underwent surgical AVF placement between 2010-2019 and had PRA testing within 1 year of AVF creation. Multivariable logistic regression was used to determine the association of patient demographic and clinical factors, class I and class II PRA levels, and preoperative arterial and venous diameters with AVF maturation outcomes. Results AVF nonmaturation was more likely in females than males (44% versus 20%, P=0.003) and in Black than white patients (40% versus 13%, P=0.001). Class II PRA was higher in females than males (12%±23% versus 4%±13%, P=0.02). In the multivariable model, AVF nonmaturation was associated with class II PRA (adjusted odds ratio [aOR], 1.34 per 10% increase; 95% confidence interval [95% CI], 1.04 to 1.82, P=0.02) and Black race (aOR, 3.34; 95% CI, 1.02 to 10.89, P=0.03), but not with patient sex or preoperative arterial or venous diameters. Conclusions The association of elevated class II PRA with AVF nonmaturation suggests the immune system may play a role in AVF maturation outcomes, especially among female patients.
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Affiliation(s)
| | - Gary Cutter
- School of Public Health, University of Alabama, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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16
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Affiliation(s)
- Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
- Veterans Affairs Medical Center, Birmingham, Alabama
| | - Jennifer E. Flythe
- University of North Carolina (UNC) Kidney Center, Division of Nephrology and Hypertension, Department of Medicine, UNC School of Medicine, Chapel Hill, North Carolina
- Cecil G. Sheps Center for Health Services Research, University of North Carolina, Chapel Hill, North Carolina
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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17
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Allon M. Kidney360: Year 1 in Review. Kidney360 2021; 2:1-3. [PMID: 35368819 PMCID: PMC8785731 DOI: 10.34067/kid.0007042020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 11/30/2020] [Indexed: 02/04/2023]
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18
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Qian J, Lee T, Thamer M, Zhang Y, Crews DC, Allon M. Racial Disparities in the Arteriovenous Fistula Care Continuum in Hemodialysis Patients. Clin J Am Soc Nephrol 2020; 15:1796-1803. [PMID: 33082199 PMCID: PMC7769016 DOI: 10.2215/cjn.03600320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 09/17/2020] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Arteriovenous fistulas are the optimal vascular access type for patients on hemodialysis. However, arteriovenous fistulas are used less frequently in Black than in White individuals. The arteriovenous fistula care continuum comprises a series of sequential steps. A better understanding is needed of where disparities exist along the continuum in order to mitigate racial differences in arteriovenous fistula use. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Using Medicare claims data from the United States Renal Data System, longitudinal analyses of patients ≥67 years initiating hemodialysis with a central venous catheter between July 1, 2010 and June 30, 2012 were performed. Three patient cohorts were identified: patients initiating hemodialysis with a catheter (n=41,814), patients with arteriovenous fistula placement within 6 months of dialysis initiation (n=14,077), and patients whose arteriovenous fistulas were successfully used within 6 months of placement (n=7068). Three arteriovenous fistula processes of care outcomes were compared between Blacks and Whites: (1) arteriovenous fistula creation, (2) successful arteriovenous fistula use, and (3) primary arteriovenous fistula patency after successful use. RESULTS An arteriovenous fistula was placed within 6 months of dialysis initiation in 37% of patients initiating dialysis with a catheter. Among the patients with arteriovenous fistula placement, the arteriovenous fistula was successfully used for dialysis within 6 months in 48% of patients. Among patients with successful arteriovenous fistula use, 21% maintained primary arteriovenous fistula patency at 3 years. After adjusting for competing risks, Black patients on hemodialysis were 10% less likely to undergo arteriovenous fistula placement (adjusted subdistribution hazard ratio, 0.90; 95% confidence interval, 0.87 to 0.94); 12% less likely to have successful arteriovenous fistula use after placement (adjusted subdistribution hazard ratio, 0.88; 95% confidence interval, 0.83 to 0.93); and 22% less likely to maintain primary arteriovenous fistula patency after successful use (subdistribution hazard ratio, 0.78; 95% confidence interval, 0.74 to 0.84). CONCLUSIONS Lower arteriovenous fistula use among Blacks older than 67 years of age treated with hemodialysis was attributable to each step along the continuum of arteriovenous fistula processes of care.
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Affiliation(s)
- Joyce Qian
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama .,Veterans Affairs Medical Center, Medical Service and Section of Nephrology, Birmingham, Alabama
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Yi Zhang
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Deidra C Crews
- Division of Nephrology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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19
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Al-Balas A, Almehmi A, Allon M. Value of Immediate Post-Kidney Biopsy Ultrasound in Excluding Late Hemorrhagic Complications. Kidney360 2020; 1:797-800. [PMID: 35372962 PMCID: PMC8815738 DOI: 10.34067/kid.0002212020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 06/22/2020] [Indexed: 06/14/2023]
Abstract
BACKGROUND Hemorrhage is the most serious potential complication of percutaneous kidney biopsy. Patients are typically observed for at least 6-8 hours after a kidney biopsy, with serial measurements of vital signs and hemoglobin to monitor for major hemorrhage. This study assessed whether an immediate postbiopsy ultrasound can reliably exclude delayed major hemorrhage. METHODS We retrospectively evaluated the clinical outcomes in 147 patients undergoing an outpatient native kidney biopsy with an 18-gauge needle at a large medical center during a 2.5-year period (January 2017 to June 2019). All patients underwent a standardized postbiopsy ultrasound to assess for active extravasation of blood. We extracted from the medical records vital signs and hemoglobin values obtained before the biopsy and at 2, 4, and 6 hours after the procedure. We ascertained whether any patients with a negative postbiopsy ultrasound developed a delayed major hemorrhage. RESULTS Each patient underwent two or three biopsy passes. The mean patient age was 48±17 years, 49% were female, 37% were black, 53% had hypertension, and 16% had diabetes. Of the 142 patients without evidence of active extravasation on ultrasound, the BP, heart rate, and hemoglobin remained stable during 6 hours of observation. All were discharged after 6 hours, and none had a late bleeding complication. CONCLUSIONS If the immediate postkidney biopsy ultrasound does not show active bleeding, the patient is extremely unlikely to develop a late major hemorrhagic complication (negative predictive value, 100%). Such patients can be discharged home safely after a 2-hour observation, thereby simplifying their management.
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Affiliation(s)
- Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
- Division of Interventional Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Ammar Almehmi
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
- Division of Interventional Radiology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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20
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Farrington C, Allon M. Authors' Reply. J Am Soc Nephrol 2020; 31:2228-2229. [PMID: 32639939 DOI: 10.1681/asn.2020060854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- Crystal Farrington
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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21
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Allon M. COVID-19 Perspective from a Hemodialysis Patient. Kidney360 2020; 1:432. [PMID: 35368595 PMCID: PMC8809305 DOI: 10.34067/kid.0002842020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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22
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Affiliation(s)
- Eric L Wallace
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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23
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Farrington CA, Robbin ML, Lee T, Barker-Finkel J, Allon M. Early Predictors of Arteriovenous Fistula Maturation: A Novel Perspective on an Enduring Problem. J Am Soc Nephrol 2020; 31:1617-1627. [PMID: 32424000 DOI: 10.1681/asn.2019080848] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 03/26/2020] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND Preoperative ultrasound mapping is routinely used to select vessels meeting minimal threshold diameters for surgical arteriovenous fistula (AVF) creation but fails to improve AVF maturation rates. This suggests a need to reassess the preoperative ultrasound criteria used to optimize AVF maturation. METHODS We retrospectively identified 300 catheter-dependent patients on hemodialysis with a new AVF created between 2010 and 2016. We then evaluated the associations of preoperative vascular measurements and hemodynamic factors with unassisted AVF maturation (successful use for dialysis without prior intervention) and overall maturation (successful use with or without prior intervention). Multivariable logistic regression was used to identify preoperative factors associated with unassisted and overall AVF maturation. RESULTS Unassisted AVF maturation associated with preoperative arterial diameter (adjusted odds ratio [aOR], 1.50 per 1-mm increase; 95% confidence interval [95% CI], 1.23 to 1.83), preoperative systolic BP (aOR, 1.16 per 10-mm Hg increase; 95% CI, 1.05 to 1.28), and left ventricular ejection fraction (aOR, 1.07 per 5% increase; 95% CI, 1.01 to 1.13). Overall AVF maturation associated with preoperative arterial diameter (aOR, 1.36 per 1-mm increase; 95% CI, 1.10 to 1.66) and preoperative systolic BP (aOR, 1.17; 95% CI, 1.06 to 1.30). Using receiver operating curves, the combination of preoperative arterial diameter, systolic BP, and left ventricular ejection fraction was fairly predictive of unassisted maturation (area under the curve, 0.69). Patient age, sex, race, diabetes, vascular disease, obesity, and AVF location were not associated with maturation. CONCLUSIONS Preoperative arterial diameter may be an under-recognized predictor of AVF maturation. Further study evaluating the effect of preoperative arterial diameter and other hemodynamic factors on AVF maturation is needed.
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Affiliation(s)
- Crystal A Farrington
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michelle L Robbin
- Department of Radiology, University of Alabama at Birmingham, Birmingham Alabama
| | - Timmy Lee
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama.,Division of Nephrology, Veterans Affairs Medical Center, Birmingham, Alabama
| | - Jill Barker-Finkel
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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24
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Lok CE, Huber TS, Lee T, Shenoy S, Yevzlin AS, Abreo K, Allon M, Asif A, Astor BC, Glickman MH, Graham J, Moist LM, Rajan DK, Roberts C, Vachharajani TJ, Valentini RP. KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update. Am J Kidney Dis 2020; 75:S1-S164. [PMID: 32778223 DOI: 10.1053/j.ajkd.2019.12.001] [Citation(s) in RCA: 877] [Impact Index Per Article: 219.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 12/09/2019] [Indexed: 02/07/2023]
Abstract
The National Kidney Foundation's Kidney Disease Outcomes Quality Initiative (KDOQI) has provided evidence-based guidelines for hemodialysis vascular access since 1996. Since the last update in 2006, there has been a great accumulation of new evidence and sophistication in the guidelines process. The 2019 update to the KDOQI Clinical Practice Guideline for Vascular Access is a comprehensive document intended to assist multidisciplinary practitioners care for chronic kidney disease patients and their vascular access. New topics include the end-stage kidney disease "Life-Plan" and related concepts, guidance on vascular access choice, new targets for arteriovenous access (fistulas and grafts) and central venous catheters, management of specific complications, and renewed approaches to some older topics. Appraisal of the quality of the evidence was independently conducted by using a Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach, and interpretation and application followed the GRADE Evidence to Decision frameworks. As applicable, each guideline statement is accompanied by rationale/background information, a detailed justification, monitoring and evaluation guidance, implementation considerations, special discussions, and recommendations for future research.
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25
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Allon M. "It's Hard, but I'm Grateful for It": A Patient Perspective on Hemodialysis. Kidney360 2020; 1:157. [PMID: 35368626 PMCID: PMC8809265 DOI: 10.34067/kid.0000712020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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26
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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27
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Allon M, Juncos LA, Perazella MA. Introduction to Kidney 360. Kidney360 2020; 1:3-4. [PMID: 35372862 PMCID: PMC8808487 DOI: 10.34067/kid.0000492019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Luis A. Juncos
- Division of Nephrology, Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; and
| | - Mark A. Perazella
- Division of Nephrology, Yale University School of Medicine, New Haven, Connecticut
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28
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Perazella MA, Juncos LA, Allon M. Clinical Images in Nephrology and Dialysis: Welcome to an Educational Feature. Kidney360 2020; 1:5. [PMID: 35372859 PMCID: PMC8808492 DOI: 10.34067/kid.0000472019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- Mark A. Perazella
- Section of Nephrology, Yale University School of Medicine, New Haven, Connecticut
- Veterans Affairs Medical Center, West Haven, Connecticut
| | - Luis A. Juncos
- Division of Nephrology, Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; and
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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Abstract
Bloodstream infections are an important cause of hospitalizations, morbidity, and mortality in patients receiving hemodialysis. Eliminating bloodstream infections in the hemodialysis setting has been the focus of the Centers for Disease Control and Prevention (CDC) Making Dialysis Safer for Patients Coalition and, more recently, the CDC's partnership with the American Society of Nephrology's Nephrologists Transforming Dialysis Safety Initiative. The majority of vascular access-associated bloodstream infections occur in patients dialyzing with central vein catheters. The CDC's core interventions for bloodstream infection prevention are the gold standard for catheter care in the hemodialysis setting and have been proven to be effective in reducing catheter-associated bloodstream infection. However, in the United States hemodialysis catheter-associated bloodstream infections continue to occur at unacceptable rates, possibly because of lapses in adherence to strict aseptic technique, or additional factors not addressed by the CDC's core interventions. There is a clear need for novel prophylactic therapies. This review highlights the recent advances and includes a discussion about the potential limitations and adverse effects associated with each option.
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Affiliation(s)
- Molly Fisher
- Division of Nephrology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York
| | - Ladan Golestaneh
- Division of Nephrology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama; and
| | - Kenneth Abreo
- Division of Nephrology, Louisiana State University Health at Shreveport, Shreveport, Louisiana
| | - Michele H Mokrzycki
- Division of Nephrology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York;
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30
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Lee T, Qian JZ, Zhang Y, Thamer M, Allon M. Long-Term Outcomes of Arteriovenous Fistulas with Unassisted versus Assisted Maturation: A Retrospective National Hemodialysis Cohort Study. J Am Soc Nephrol 2019; 30:2209-2218. [PMID: 31611240 DOI: 10.1681/asn.2019030318] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 07/29/2019] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND About half of arteriovenous fistulas (AVFs) require one or more interventions before successful dialysis use, a process called assisted maturation. Previous research suggested that AVF abandonment and interventions to maintain patency after maturation may be more frequent with assisted maturation versus unassisted maturation. METHODS Using the US Renal Data System, we retrospectively compared patients with assisted versus unassisted AVF maturation for postmaturation AVF outcomes, including functional primary patency loss (requiring intervention after achieving AVF maturation), AVF abandonment, and frequency of interventions. RESULTS We included 7301 patients ≥67 years who initiated hemodialysis from July 2010 to June 2012 with a catheter and no prior AVF; all had an AVF created within 6 months of starting hemodialysis and used for dialysis (matured) within 6 months of creation, with 2-year postmaturation follow-up. AVFs matured without prior intervention for 56% of the patients. Assisted AVF maturation with one, two, three, or four or more prematuration interventions occurred in 23%, 12%, 5%, and 4% of patients, respectively. Patients with prematuration interventions had significantly increased risk of functional primary patency loss compared with patients who had unassisted AVF maturation, and the risk increased with the number of interventions. Although the likelihood of AVF abandonment was not higher among patients with up to three prematuration interventions compared with patients with unassisted AVF maturation, it was significantly higher among those with four or more interventions. CONCLUSIONS For this cohort of patients undergoing assisted AVF maturation, we observed a positive association between the number of prematuration AVF interventions and the likelihood of functional primary patency loss and frequency of postmaturation interventions.
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Affiliation(s)
- Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama; .,Veterans Affairs Medical Center, Birmingham, Alabama; and
| | - Joyce Zhang Qian
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Yi Zhang
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
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Allon M, Thornley-Brown D, Rizk DV, Carrasquillo AJ. Second-Chance Placement of Hemodialysis Patients After Involuntary Discharge for Disruptive Behavior. Am J Kidney Dis 2019; 74:544-548. [DOI: 10.1053/j.ajkd.2019.05.008] [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] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 05/05/2019] [Indexed: 11/11/2022]
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL
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33
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Al-Balas A, Shariff S, Lee T, Young C, Allon M. Clinical Outcomes and Economic Impact of Starting Hemodialysis with a Catheter after Predialysis Arteriovenous Fistula Creation. Am J Nephrol 2019; 50:221-227. [PMID: 31394548 DOI: 10.1159/000502050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 05/10/2019] [Accepted: 07/10/2019] [Indexed: 11/19/2022]
Abstract
BACKGROUND Patients with advanced chronic kidney disease frequently undergo arteriovenous fistula creation prior to reaching end-stage renal disease (ESRD), but some initiate hemodialysis with a central vein catheter, if their fistula is not yet usable. The clinical consequences of the delay in fistula use have not been quantified in such patients. We compared patients with pre-ESRD fistula surgery who initiated dialysis with a catheter versus a fistula in terms of the frequency of post-dialysis vascular access procedures and complications and their economic impact. METHODS We identified 205 patients with predialysis fistula creation from 2006 to 2012 at a large dialysis center who started hemodialysis within the ensuing 2 years. Of these, 91 (44%) initiated dialysis with a catheter and 114 (56%) with a fistula. We compared these 2 groups in terms of their annual frequency of percutaneous vascular access procedures, surgical access procedures, total access procedures, hospitalizations due to catheter-related bacteremia, and overall cost of vascular access management. RESULTS The 2 groups were similar in demographics, comorbidities, and fistula type. As compared to patients initiating dialysis with a fistula, those initiating with a catheter had a significantly greater annual frequency of percutaneous access procedures (1.29 [1.19-1.40] vs. 0.75 [0.68-0.82]), surgical access procedures (0.69 [0.61-0.76] vs. 0.59 [0.53-0.66]), total access procedures (1.98 [1.86-2.11] vs. 1.34 [1.26-1.44]), and hospitalizations due to catheter-related bacteremia (0.09 [0.07-0.12] vs. 0.02 [0.01-0.03]). Patients initiating dialysis with a catheter incurred a median overall annual cost of access management that was USD 2,669 higher (USD 6,372 [3,121-12,242) vs. USD 3,703 [1,867-6,953], p = 0.0001). CONCLUSION Among patients with predialysis fistula creation, those initiating dialysis with a catheter versus a fistula had substantially more frequent percutaneous, surgical, and total vascular access procedures, as well as hospitalizations due to catheter-related bacteremia. The annual cost of access management was substantially higher in those initiating dialysis with a catheter.
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Affiliation(s)
- Alian Al-Balas
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA,
- Division of Interventional Radiology, University of Alabama at Birmingham, Birmingham, Alabama, USA,
| | - Saad Shariff
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Timmy Lee
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA
- Veterans Affairs Medical Center, Birmingham, Alabama, USA
| | - Carlton Young
- Division of Transplant Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Allon M. Lessons From International Differences in Vascular Access Practices and Outcomes. Am J Kidney Dis 2019; 71:452-454. [PMID: 29579416 DOI: 10.1053/j.ajkd.2017.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 12/08/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL.
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Farrington CA, Allon M. Complications of Hemodialysis Catheter Bloodstream Infections: Impact of Infecting Organism. Am J Nephrol 2019; 50:126-132. [PMID: 31242483 DOI: 10.1159/000501357] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 04/24/2019] [Accepted: 05/31/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND Catheter-related bloodstream infections -(CRBSI) are associated with a high burden of morbidity and mortality, but the impact of infecting organism on clinical outcomes has been poorly studied. METHODS This retrospective analysis of a prospective vascular access database from a large academic dialysis center investigated whether the organism type affected the clinical presentation or complications of CRBSI. RESULTS Among 339 patients with suspected CRBSI, an alternate source of infection was identified in 50 (15%). Of 289 patients with CRBSI, 249 grew a single organism and 40 were polymicrobial. Fever and/or rigors were presenting signs in ≥90% of patients with Staphylococcus aureus or Gram-negative CRBSI, but only 61% of Staphylococcus epidermidis infections (p < 0.001). Hospitalization occurred in 67% of patients with S. aureus CRBSI versus 34% of those with S. epidermidis and 40% of those with a Gram-negative bacteria (p < 0.001). Admission to the intensive care unit was required in 14, 9, and 2% (p = 0.06); metastatic infection occurred in 10, 4, and 4% (p = 0.42); and median length of stay among patients admitted to the hospital was 4, 4, and 5.5 days (p = 0.60), respectively. Death due to CRBSI occurred in only 1% of patients with CRBSI. CONCLUSION CRBSI is confirmed in 85% of catheter-dependent hemodialysis patients in whom it is suspected. S. epidermidis CRBSI tends to present with atypical symptoms. S. aureus CRBSI is more likely to require hospitalization or intensive care admission. Metastatic infection is relatively uncommon, and death due to CRBSI is rare.
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Affiliation(s)
- Crystal A Farrington
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA,
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA
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Kubiak R, Zelnick L, Hoofnagle A, Alpers C, Terry C, Shiu YT, Cheung A, de Boer I, Robinson-Cohen C, Allon M, Dember L, Feldman H, Himmelfarb J, Huber T, Roy-Chaudhury P, Vazquez M, Kusek J, Beck G, Imrey P, Kestenbaum B. Mineral Metabolism Disturbances and Arteriovenous Fistula Maturation. J Vasc Surg 2019. [DOI: 10.1016/j.jvs.2019.04.456] [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: 11/26/2022]
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Kubiak RW, Zelnick LR, Hoofnagle AN, Alpers CE, Terry CM, Shiu YT, Cheung AK, de Boer IH, Robinson-Cohen C, Allon M, Dember LM, Feldman HI, Himmelfarb J, Huber TS, Roy-Chaudhury P, Vazquez MA, Kusek JW, Beck GJ, Imrey PB, Kestenbaum B. Mineral Metabolism Disturbances and Arteriovenous Fistula Maturation. Eur J Vasc Endovasc Surg 2019; 57:719-728. [PMID: 31000459 PMCID: PMC7259372 DOI: 10.1016/j.ejvs.2019.01.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 12/20/2017] [Accepted: 01/22/2019] [Indexed: 02/08/2023]
Abstract
BACKGROUND The arteriovenous fistula (AVF) is central to haemodialysis treatment, but up to half of surgically created AVF fail to mature. Chronic kidney disease often leads to mineral metabolism disturbances that may interfere with AVF maturation through adverse vascular effects. This study tested associations between mineral metabolism markers and vein histology at AVF creation and unassisted and overall clinical AVF maturation. METHODS Concentrations of fibroblast growth factor 23, parathyroid hormone, calcium, phosphate, and vitamin D metabolites: 1,25(OH)2D, 24,25(OH)2D, 25(OH)D, and bioavailable 25(OH)D were measured in pre-operative serum samples from 562 of 602 participants in the Haemodialysis Fistula Maturation Study, a multicentre, prospective cohort study of patients undergoing surgical creation of an autologous upper extremity AVF. Unassisted and overall AVF maturation were ascertained for 540 and 527 participants, respectively, within nine months of surgery or four weeks of dialysis initiation. Study personnel obtained vein segments adjacent to the portion of the vein used for anastomosis, which were processed, embedded, and stained for measurement of neointimal hyperplasia, calcification, and collagen deposition in the medial wall. RESULTS Participants in this substudy were 71% male, 43% black, and had a mean age of 55 years. Failure to achieve AVF maturation without assistance occurred in 288 (53%) participants for whom this outcome was determined. In demographic and further adjusted models, mineral metabolism markers were not significantly associated with vein histology characteristics, unassisted AVF maturation failure, or overall maturation failure, other than a biologically unexplained association of higher 24,25(OH)2D with overall failure. This exception aside, associations were non-significant for continuous and categorical analyses and relevant subgroups. CONCLUSIONS Serum concentrations of measured mineral metabolites were not substantially associated with major histological characteristics of veins in patients undergoing AVF creation surgery, or with AVF maturation failure, suggesting that efforts to improve AVF maturation rates should increase attention to other processes such as vein mechanics, anatomy, and cellular metabolism among end stage renal disease patients.
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Affiliation(s)
- Rachel W Kubiak
- Kidney Research Institute, University of Washington, Seattle, WA, USA; Department of Epidemiology, University of Washington, Seattle, WA, USA.
| | - Leila R Zelnick
- Kidney Research Institute, University of Washington, Seattle, WA, USA
| | - Andy N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
| | - Charles E Alpers
- Department of Pathology, University of Washington, Seattle, WA, USA
| | - Christi M Terry
- Division of Nephrology & Hypertension, University of Utah and Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, USA
| | - Yan-Ting Shiu
- Division of Nephrology & Hypertension, University of Utah and Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, USA
| | - Alfred K Cheung
- Division of Nephrology & Hypertension, University of Utah and Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, USA
| | - Ian H de Boer
- Kidney Research Institute, University of Washington, Seattle, WA, USA
| | | | - Michael Allon
- Department of Vascular Surgery, University of Alabama, Birmingham, AL, USA
| | - Laura M Dember
- Renal, Electrolyte & Hypertension Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Harold I Feldman
- Department of Biostatistics and Epidemiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | | | - Thomas S Huber
- Division of Vascular Surgery and Endovascular Therapy, University of Florida College of Medicine, Gainesville, FL, USA
| | - Prabir Roy-Chaudhury
- Division of Nephrology and the University of Arizona Kidney Disease Program, University of Arizona, Tucson, AZ, USA
| | - Miguel A Vazquez
- Division of Nephrology, University of Texas Southwestern, Dallas, TX, USA
| | - John W Kusek
- National Institutes of Diabetes and Digestive and Kidney Diseases, Division of Kidney, Urologic & Hematologic Diseases, Bethesda, MD, USA
| | - Gerald J Beck
- Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, USA
| | - Peter B Imrey
- Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, USA; Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH, USA
| | - Bryan Kestenbaum
- Kidney Research Institute, University of Washington, Seattle, WA, USA
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Abstract
This commentary critically examines key assumptions and recommendations in the 2006 Kidney Disease Outcomes Quality Initiative vascular access guidelines, and argues that several are not relevant to the contemporary United States hemodialysis population. First, the guidelines prefer arteriovenous fistulas (AVFs) over arteriovenous grafts (AVGs), on the basis of their superior secondary survival and lower frequency of interventions and infections. However, intent-to-treat analyses that incorporate the higher primary failure of AVFs, demonstrate equivalent secondary survival of both access types. Moreover, the lower rate of AVF versus AVG infections is counterbalanced by the higher rate of catheter-related bloodstream infections before AVF maturation. In addition, AVFs with assisted maturation (interventions before successful AVF use), which account for about 50% of new AVFs, are associated with inferior secondary patency compared with AVGs without intervention before successful use. Second, the guidelines posit lower access management costs for AVFs than AVGs. However, in patients who undergo AVF or AVG placement after starting dialysis with a central venous catheter (CVC), the overall cost of access management is actually higher in patients receiving an AVF. Third, the guidelines prefer forearm over upper arm AVFs. However, published data demonstrate superior maturation of upper arm versus forearm AVFs, likely explaining the progressive increase in upper arm AVFs in the United States. Fourth, AVFs are thought to fail primarily because of aggressive juxta-anastomotic stenosis. However, recent evidence suggests that many AVFs mature despite neointimal hyperplasia, and that suboptimal arterial vasodilation may be an equally important contributor to AVF nonmaturation. Finally, CVC use is believed to result in excess mortality in patients on hemodialysis. However, recent data suggest that CVC use is simply a surrogate marker of sicker patients who are more likely to die, rather than being a mediator of mortality.
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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Affiliation(s)
- Crystal A Farrington
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL.
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Lee T, Qian J, Thamer M, Allon M. Gender Disparities in Vascular Access Surgical Outcomes in Elderly Hemodialysis Patients. Am J Nephrol 2018; 49:11-19. [PMID: 30544112 DOI: 10.1159/000495261] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 10/01/2018] [Accepted: 11/10/2018] [Indexed: 11/19/2022]
Abstract
BACKGROUND Despite national vascular access guidelines promoting the use of arteriovenous fistulas (AVF) over arteriovenous grafts (AVGs) for dialysis, AVF use is substantially lower in females. We assessed clinically relevant AVF and AVG surgical outcomes in elderly male and female patients initiating hemodialysis with a central venous catheter (CVC). METHODS Using the United States Renal Data System standard analytic files linked with Medicare claims, we assessed incident hemodialysis patients in the United States, 9,458 elderly patients (≥67 years; 4,927 males and 4,531 females) initiating hemodialysis from July 2010 to June 2011 with a catheter and had an AVF or AVG placed within 6 months. We evaluated vascular access placement, successful use for dialysis, assisted use (requiring an intervention before successful use), abandonment after successful use, and rate of interventions after successful use. RESULTS Females were less likely than males to receive an AVF (adjusted likelihood 0.57, 95% CI 0.52-0.63). Among patients receiving an AVF, females had higher adjusted likelihoods of unsuccessful AVF use (hazard ratio [HR] 1.46, 95% CI 1.36-1.56), assisted AVF use (OR 1.34, 95% CI 1.17-1.54), and AVF abandonment (HR 1.28, 95% CI 1.10-1.50), but similar relative rate of AVF interventions after successful use (relative risk [RR] 1.01, 95% CI 0.94-1.08). Among patients receiving an AVG, females had a lower likelihood of unsuccessful AVG use (HR 0.83, 95% CI 0.73-0.94), similar rates of assisted AVG use (OR 1.05, 95% CI 0.78-1.40) and AVG abandonment, and greater relative rate of interventions after successful AVG use (RR 1.16, 95% CI 1.01-1.33). CONCLUSIONS While AVFs should be considered the preferred vascular access in most circumstances, clinical AVF surgical outcomes are uniformly worse in females. Clinicians should also consider AVGs as a viable alternative in elderly female patients initiating hemodialysis with a CVC to avoid extended CVC dependence.
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Affiliation(s)
- Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at, Birmingham, Alabama, USA,
- Veterans Affairs Medical Center, Birmingham, Alabama, USA,
| | - Joyce Qian
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland, USA
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, Maryland, USA
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at, Birmingham, Alabama, USA
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Al-Balas A, Lee T, Young CJ, Allon M. Choice of a second vascular access in hemodialysis patients whose initial arteriovenous fistula failed to mature. J Vasc Surg 2018; 68:1858-1864.e1. [DOI: 10.1016/j.jvs.2018.03.419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 03/22/2018] [Indexed: 11/30/2022]
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Robbin ML, Greene T, Allon M, Dember LM, Imrey PB, Cheung AK, Himmelfarb J, Huber TS, Kaufman JS, Radeva MK, Roy-Chaudhury P, Shiu YT, Vazquez MA, Umphrey HR, Alexander L, Abts C, Beck GJ, Kusek JW, Feldman HI. Prediction of Arteriovenous Fistula Clinical Maturation from Postoperative Ultrasound Measurements: Findings from the Hemodialysis Fistula Maturation Study. J Am Soc Nephrol 2018; 29:2735-2744. [PMID: 30309898 DOI: 10.1681/asn.2017111225] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 09/06/2018] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The utility of early postoperative ultrasound measurements in predicting arteriovenous fistula (AVF) clinical maturation is uncertain. METHODS We investigated the relationships of ultrasound parameters with AVF clinical maturation in newly created AVF, measured at 1 day and 2 and 6 weeks, in 602 participants of a multicenter, observational cohort study. A backward elimination algorithm identified ultrasound measurements that independently predicted unassisted and overall AVF maturation. Candidate variables included AVF blood flow, diameter, and depth, upper arm arterial diameter, presence of stenosis, presence of accessory veins, seven case-mix factors (age, sex, black race, AVF location, diabetes, dialysis status, and body mass index), and clinical center. We evaluated the accuracy of the resulting models for clinical prediction. RESULTS At each ultrasound measurement time, AVF blood flow, diameter, and depth each predicted in a statistically significant manner both unassisted and overall clinical maturation. Moreover, neither the remaining ultrasound parameters nor case-mix factors were associated with clinical AVF maturation after accounting for blood flow, diameter, and depth, although maturation probabilities differed among clinical centers before and after accounting for these parameters. The crossvalidated area under the receiver operating characteristic curve for models constructed using these three ultrasound parameters was 0.69, 0.74, and 0.79 at 1 day and 2 and 6 weeks, respectively, for unassisted AVF clinical maturation and 0.69, 0.71, and 0.76, respectively, for overall AVF maturation. CONCLUSIONS AVF blood flow, diameter, and depth moderately predicted unassisted and overall AVF clinical maturation. The other factors considered did not further improve AVF maturation prediction.
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Affiliation(s)
| | - Tom Greene
- Departments of Population Health Sciences and.,Internal Medicine and
| | - Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama
| | - Laura M Dember
- Renal, Electrolyte and Hypertension Division, Department of Medicine, and Center for Clinical Epidemiology and Biostatistics, and Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Peter B Imrey
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio.,Cleveland Clinic Lerner College of Medicine, School of Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Alfred K Cheung
- Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah.,Division of Nephrology and Hypertension, University of Utah, Salt Lake City, Utah.,Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, People's Republic of China
| | - Jonathan Himmelfarb
- Kidney Research Institute, Department of Medicine, University of Washington, Seattle, Washington
| | - Thomas S Huber
- Division of Vascular Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - James S Kaufman
- Renal Section, Veterans Affairs New York Harbor Healthcare System, New York, New York.,Division of Nephrology, New York University School and Medicine, New York, New York
| | - Milena K Radeva
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
| | - Prabir Roy-Chaudhury
- Division of Nephrology, University of Arizona College of Medicine, Tucson, Arizona
| | - Yan-Ting Shiu
- Division of Nephrology and Hypertension, University of Utah, Salt Lake City, Utah
| | - Miguel A Vazquez
- Division of Nephrology, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas
| | | | | | | | - Gerald J Beck
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio
| | - John W Kusek
- Division of Kidney, Urologic and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland
| | - Harold I Feldman
- Department of Biostatistics and Epidemiology, Department of Medicine, and Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
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Farrington CA, Robbin ML, Lee T, Barker-Finkel J, Allon M. Postoperative Ultrasound, Unassisted Maturation, and Subsequent Primary Patency of Arteriovenous Fistulas. Clin J Am Soc Nephrol 2018; 13:1364-1372. [PMID: 30139806 PMCID: PMC6140570 DOI: 10.2215/cjn.02230218] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [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: 02/19/2018] [Accepted: 07/11/2018] [Indexed: 11/23/2022]
Abstract
BACKGROUND AND OBJECTIVES Postoperative ultrasound is commonly used to assess arteriovenous fistula (AVF) maturation for hemodialysis, but its utility for predicting unassisted AVF maturation or primary AVF patency for hemodialysis has not been well defined. This study assessed the predictive value of postoperative AVF ultrasound measurements for these clinical AVF outcomes. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS We queried a prospective vascular access database to identify 246 patients on catheter-dependent hemodialysis who underwent AVF creation between 2010 and 2016 and obtained a postoperative ultrasound within 90 days. Multivariable logistic regression was used to evaluate the association of clinical characteristics and postoperative ultrasound measurements with unassisted AVF maturation. A receiver operating characteristic curve estimated the predictive value of these factors for unassisted AVF maturation. Finally, multivariable survival analysis was used to identify factors associated with primary AVF patency in patients with unassisted AVF maturation. RESULTS Unassisted AVF maturation occurred in 121 out of 246 patients (49%), assisted maturation in 55 patients (22%), and failure to mature in 70 patients (28%). Using multivariable logistic regression, unassisted AVF maturation was associated with AVF blood flow (odds ratio [OR], 1.30; 95% confidence interval [95% CI], 1.18 to 1.45 per 100 ml/min increase; P<0.001), forearm location (OR, 0.37; 95% CI, 0.08 to 1.78; P=0.21), presence of stenosis (OR, 0.45; 95% CI, 0.23 to 0.88; P=0.02); AVF depth (OR, 0.88; 95% CI, 0.77 to 1.00 per 1 mm increase; P=0.05), and AVF location interaction with depth (OR, 0.50; 95% CI, 0.28 to 0.84; P=0.02). The area under the receiver operating characteristic curve, using all these factors, was 0.84 (95% CI, 0.79 to 0.89; P<0.001). Primary AVF patency in patients with unassisted maturation was associated only with AVF diameter (hazard ratio, 0.84; 95% CI, 0.76 to 0.94 per 1 mm increase; P=0.002). CONCLUSIONS Unassisted AVF maturation is predicted by AVF blood flow, location, depth, and stenosis. AVF patency after unassisted maturation is predicted only by the postoperative AVF diameter.
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Affiliation(s)
| | | | - Timmy Lee
- Division of Nephrology
- Veterans Affairs Medical Center, Birmingham, Alabama
| | - Jill Barker-Finkel
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, Alabama; and
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Allon M, Litovsky SH, Zhang Y, Le H, Cheung AK, Shiu YT. Association of Preexisting Arterial Intimal Hyperplasia with Arteriovenous Fistula Outcomes. Clin J Am Soc Nephrol 2018; 13:1358-1363. [PMID: 30139803 PMCID: PMC6140554 DOI: 10.2215/cjn.13431217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 06/18/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND AND OBJECTIVES Preoperative arterial function is associated with arteriovenous fistula (AVF) development. Because arterial pathology may correlate with its function, preexisting arterial intimal hyperplasia may be associated with AVF development. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Vascular specimens obtained from 125 patients (with minimal 2 mm arterial diameter and 2.5 mm venous diameter) undergoing AVF creation were quantified for arterial intimal hyperplasia, arterial medial fibrosis, arterial microcalcification, and venous intimal hyperplasia. A 6-week postoperative ultrasound quantified AVF diameter, blood flow, and stenosis. Clinical AVF maturation was assessed using a predefined protocol. In a prospective cohort study design, we investigated the association of preexisting arterial intimal hyperplasia with the postoperative AVF diameter, blood flow, stenosis, and clinical maturation failure, after controlling for baseline demographics, comorbidities, and preoperative vein diameter. Additional analyses evaluated whether other vascular pathologies interacted with arterial intimal hyperplasia in affecting AVF outcomes. RESULTS The median intimal thickness of the native artery was 22.0 μm (interquartile range, 14.8-37.1 μm). The median postoperative AVF diameter was 4.8 (interquartile range, 3.7-6.8) mm, blood flow was 796 (interquartile range, 413-1036) ml/min, and stenosis was present in 37 out of 98 patients with ultrasound data (38%). AVF nonmaturation occurred in 37 out of 125 patients (30%). Preexisting arterial intimal thickness was not significantly associated with AVF blood flow (-12 ml/min; 95% confidence interval [95% CI], -55 to 30 ml/min), diameter (-0.04 mm; 95% CI, -0.21 to 0.14 mm), stenosis (odds ratio, 0.93; 95% CI, 0.75 to 1.14), or clinical maturation failure (odds ratio, 1.07; 95% CI, 0.90 to 1.28), all per 10 μm increase. There was no significant interaction of preexisting arterial intimal thickness and postoperative AVF outcomes with arterial medial fibrosis, arterial microcalcification, or venous intimal hyperplasia. CONCLUSIONS Preexisting arterial intimal hyperplasia is not associated with the 6-week AVF blood flow, diameter or stenosis, or clinical maturation when the preoperative arterial diameter is ≥2 mm.
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Affiliation(s)
| | - Silvio H. Litovsky
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama
| | | | - Ha Le
- Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
| | - Alfred K. Cheung
- Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
- Medical Service, Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, Utah; and
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yan-Ting Shiu
- Nephrology and Hypertension, Department of Internal Medicine, University of Utah, Salt Lake City, Utah
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Lee T, Qian J, Thamer M, Allon M. Tradeoffs in Vascular Access Selection in Elderly Patients Initiating Hemodialysis With a Catheter. Am J Kidney Dis 2018; 72:509-518. [PMID: 29784614 DOI: 10.1053/j.ajkd.2018.03.023] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 03/13/2018] [Indexed: 11/11/2022]
Abstract
RATIONALE & OBJECTIVE National vascular access guidelines recommend placement of arteriovenous fistulas (AVFs) over grafts (AVGs) in hemodialysis patients, but have not been comprehensively assessed in the elderly. We evaluated clinically relevant vascular access outcomes in elderly patients receiving an AVF or AVG after hemodialysis therapy initiation. STUDY DESIGN Retrospective cohort study using national administrative data. SETTINGS & PARTCIPANTS Claims data from the US Renal Data System of 9,458 US patients 67 years and older who initiated hemodialysis therapy from July 1, 2010, to June 30, 2011, with a catheter and received an AVF (n=7,433) or AVG (n=2,025) within the ensuing 6 months. PREDICTOR Arteriovenous access subtype, AVF or AVG. OUTCOMES Successful use of vascular access, interventions to make vascular access functional, duration of catheter dependence before successful use of vascular access, frequency of interventions, and abandonment after successful use of vascular access. ANALYTICAL APPROACH Multivariable logistic regression analysis was used to compare the need for intervention before successful use of AVFs and AVGs, and negative bionomial regression was used to calculate the frequency of intervention after successful use of vascular access. RESULTS Unsuccessful use of vascular access within 6 months of creation was higher for AVFs versus AVGs (51% vs 45%; adjusted HR, 1.86; 95% CI, 1.73-1.99). Interventions to make vascular access functional were greater in AVFs versus AVGs (42% vs 23%; OR, 2.66; 95% CI, 2.26-3.12). AVFs had a lower 1-year abandonment rate after successful use compared with AVGs (OR, 0.71; 95% CI, 0.62-0.83) and required one-fourth fewer interventions after successful use (relative risk, 0.75; 95% CI, 0.69-0.81). Patients receiving an AVF had substantially longer catheter dependence before successful use than those receiving an AVG (median time, 3 vs 1 month; P<0.001). LIMITATIONS Residual confounding due to vascular access choice, restriction to an elderly population, and 1-year follow-up period. CONCLUSIONS In elderly hemodialysis patients initiating hemodialysis therapy with a catheter, the optimal vascular access selection depends on tradeoffs between shorter catheter dependence and less frequent interventions to make the vascular access (AVG) functional versus longer access patency and fewer interventions after successful use of the vascular access (AVF).
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Affiliation(s)
- Timmy Lee
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, AL; Veterans Affairs Medical Center, Birmingham, AL.
| | - Joyce Qian
- Medical Technology and Practice Patterns Institute, Bethesda, MD
| | - Mae Thamer
- Medical Technology and Practice Patterns Institute, Bethesda, MD
| | - Michael Allon
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, AL
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Allon M, Litovsky SH, Tey JCS, Sundberg CA, Zhang Y, Chen Z, Fang Y, Cheung AK, Shiu YT. Abnormalities of vascular histology and collagen fiber configuration in patients with advanced chronic kidney disease. J Vasc Access 2018; 20:31-40. [PMID: 29742957 DOI: 10.1177/1129729818773305] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
INTRODUCTION: Several histologic features have been identified in the upper-extremity arteries and veins of patients with advanced chronic kidney disease, which may affect arteriovenous fistula maturation. However, it is unclear whether these chronic kidney disease vascular features are abnormal. METHODS: We obtained upper-extremity arterial and venous specimens from 125 advanced chronic kidney disease patients undergoing arteriovenous fistula creation and from 15 control subjects. We quantified medial fibrosis, micro-calcification, and intimal hyperplasia with appropriate histology stains. We characterized medial collagen fiber configuration in second-harmonic-generation microscopy images for the fiber anisotropy index and the dominant fiber direction. RESULTS: The advanced chronic kidney disease patients were significantly younger than control subjects (53 ± 14 years vs 76 ± 11 years, p < 0.001). After controlling for age, the chronic kidney disease patients had greater arterial medial fibrosis (69% ± 14% vs 51% ± 10%, p < 0.001) and greater arterial micro-calcification (3.03% ± 5.17% vs 0.01% ± 0.03%, p = 0.02), but less arterial intimal thickness (30 ± 25 µm vs 63 ± 25 µm, p < 0.001), as compared to control subjects. The anisotropy index of medial collagen fibers was lower in both arteries (0.24 ± 0.10 vs 0.44 ± 0.04, p < 0.001) and veins (0.28 ± 0.09 vs 0.53 ± 0.10, p < 0.001) in chronic kidney disease patients, indicating that orientation of the fibers was more disordered. The dominant direction of medial collagen fibers in chronic kidney disease patients was greater in the arteries (49.3° ± 23.6° vs 4.0° ± 2.0°, p < 0.001) and the veins (30.0° ± 19.6° vs 3.9° ± 2.1°, p < 0.001), indicating that the fibers in general were aligned more perpendicular to the lumen. CONCLUSION: Advanced chronic kidney disease is associated with several abnormalities in vascular histology and collagen fiber configuration. Future research is needed to investigate whether these abnormalities affect the maturation outcomes of arteriovenous fistulas.
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Affiliation(s)
- Michael Allon
- 1 Division of Nephrology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Silvio H Litovsky
- 2 Department of Pathology, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Jason Chieh Sheng Tey
- 3 Division of Nephrology & Hypertension, Department of Internal Medicine, The University of Utah, Salt Lake City, UT, USA
| | - Chad A Sundberg
- 3 Division of Nephrology & Hypertension, Department of Internal Medicine, The University of Utah, Salt Lake City, UT, USA
| | - Yingying Zhang
- 4 Division of Epidemiology, Department of Internal Medicine, The University of Utah, Salt Lake City, UT, USA
| | - Zhen Chen
- 5 Department of Diabetes Complications & Metabolism, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Yun Fang
- 6 Section of Pulmonary and Critical Care, Department of Medicine, The University of Chicago, Chicago, IL, USA
| | - Alfred K Cheung
- 3 Division of Nephrology & Hypertension, Department of Internal Medicine, The University of Utah, Salt Lake City, UT, USA.,7 Medical Service, Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT, USA.,8 Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China
| | - Yan-Ting Shiu
- 3 Division of Nephrology & Hypertension, Department of Internal Medicine, The University of Utah, Salt Lake City, UT, USA
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Allon M, Imrey PB, Cheung AK, Radeva M, Alpers CE, Beck GJ, Dember LM, Farber A, Greene T, Himmelfarb J, Huber TS, Kaufman JS, Kusek JW, Roy-Chaudhury P, Robbin ML, Vazquez MA, Feldman HI. Relationships Between Clinical Processes and Arteriovenous Fistula Cannulation and Maturation: A Multicenter Prospective Cohort Study. Am J Kidney Dis 2018; 71:677-689. [PMID: 29398178 PMCID: PMC5916528 DOI: 10.1053/j.ajkd.2017.10.027] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [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: 06/02/2017] [Accepted: 10/31/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Half of surgically created arteriovenous fistulas (AVFs) require additional intervention to effectively support hemodialysis. Postoperative care and complications may affect clinical maturation. STUDY DESIGN Hemodialysis Fistula Maturation (HFM) Study, a 7-center prospective cohort study. SETTING & PARTICIPANTS 491 patients with single-stage AVFs who had neither thrombosis nor AVF intervention before a 6-week postoperative ultrasonographic examination and who required maintenance hemodialysis. PREDICTORS Postoperative care processes and complications. OUTCOMES Attempted cannulation, successful cannulation, and unassisted and overall clinical maturation as defined by the HFM Study criteria. RESULTS AVF cannulation was attempted in 443 of 491 (90.2%) participants and was eventually successful in 430 of these 443 (97.1%) participants. 263 of these 430 (61.2%) reached unassisted and 118 (27.4%) reached assisted AVF maturation (overall maturation, 381/430 [88.6%]). Attempted cannulation was less likely in patients of surgeons with policies for routine 2-week versus later-than-2-week first postoperative visits (OR, 0.21; 95% CI, 0.06-0.70), routine second postoperative follow-up visits (OR, 0.39; 95% CI, 0.15-0.97), and a routine clinical postoperative ultrasound (OR, 0.28; 95% CI, 0.14-0.55). Attempted cannulation was also less likely among patients undergoing procedures to assist maturation (OR, 0.51; 95% CI, 0.27-0.98). Unassisted maturation was more likely for patients treated in facilities with access coordinators (OR, 1.91; 95% CI, 1.17-3.12), but less likely after precannulation nonstudy ultrasounds (OR per ultrasound, 0.42 [95% CI, 0.26-0.68]) and initial unsuccessful cannulation attempts (OR per each additional attempt, 0.90 [95% CI, 0.83-0.98]). Overall maturation was less likely with infiltration before successful cannulation (OR, 0.44; 95% CI, 0.22-0.89). Among participants receiving maintenance hemodialysis before AVF surgery, unassisted and overall maturation were less likely with longer intervals from surgery to initial cannulation (ORs for each additional month of 0.81 [95% CI, 0.76-0.88] and 0.93 [95% CI, 0.89-0.98], respectively) and from initial to successful cannulation (ORs for each additional week of 0.87 [95% CI, 0.81-0.94] and 0.88 [95% CI, 0.83-0.94], respectively). LIMITATIONS Surgeons' management policies were assessed only by questionnaire at study onset. Most participants received upper-arm AVFs, planned 2-stage AVFs were excluded, and maturation time windows were imposed. Some care processes may have been missed and the observational design limits causal attribution. CONCLUSIONS Multiple processes of care and complications are associated with AVF maturation outcomes.
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Affiliation(s)
- Michael Allon
- Division of Nephrology, University of Alabama at Birmingham, Birmingham, AL.
| | - Peter B Imrey
- Cleveland Clinic Lerner College of Medicine of Case Western Reserve University; Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
| | - Alfred K Cheung
- Division of Nephrology & Hypertension, University of Utah and Veterans Affairs Salt Lake City Healthcare System, Salt Lake City, UT; Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, People's Republic of China
| | - Milena Radeva
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
| | - Charles E Alpers
- Department of Pathology, University of Washington Medical Center, Seattle, WA
| | - Gerald J Beck
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
| | - Laura M Dember
- Renal-Electrolyte and Hypertension Division, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | - Alik Farber
- Division of Vascular and Endovascular Surgery, Boston Medical Center, Boston, MA
| | - Tom Greene
- Division of Epidemiology, University of Utah, Salt Lake City, UT
| | - Jonathan Himmelfarb
- Kidney Research Institute, Department of Medicine, University of Washington, Seattle, WA
| | - Thomas S Huber
- Division of Vascular Surgery, University of Florida College of Medicine, Gainesville, FL
| | - James S Kaufman
- VA New York Harbor Healthcare System and New York University School of Medicine, New York, NY
| | - John W Kusek
- Division of Kidney, Urologic and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD
| | | | - Michelle L Robbin
- Department of Radiology, University of Alabama at Birmingham, Birmingham, AL
| | - Miguel A Vazquez
- Division of Nephrology, University of Texas Southwestern, Dallas, TX
| | - Harold I Feldman
- Department of Biostatistics and Epidemiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
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Shenoy S, Allon M, Beathard G, Brouwer-Maier D, Dember LM, Glickman M, Lee C, Litchfield T, Lok C, Huber T, Roy-Chaudhury P, Work J, West M, Wasse H. Clinical Trial End Points for Hemodialysis Vascular Access: Background, Rationale, and Definitions. Clin J Am Soc Nephrol 2018; 13:490-494. [PMID: 29487092 PMCID: PMC5967685 DOI: 10.2215/cjn.13321216] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Surendra Shenoy
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
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Allon M, Brouwer-Maier DJ, Abreo K, Baskin KM, Bregel K, Chand DH, Easom AM, Mermel L, Mokrzycki MH, Patel PR, Roy-Chaudhury P, Shenoy S, Valentini RP, Wasse H. Recommended Clinical Trial End Points for Dialysis Catheters. Clin J Am Soc Nephrol 2018; 13:495-500. [PMID: 28729382 PMCID: PMC5967684 DOI: 10.2215/cjn.12011116] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Central venous catheters are used frequently in patients on hemodialysis as a bridge to a permanent vascular access. They are prone to frequent complications, including catheter-related bloodstream infection, catheter dysfunction, and central vein obstruction. There is a compelling need to develop new drugs or devices to prevent central venous catheter complications. We convened a multidisciplinary panel of experts to propose standardized definitions of catheter end points to guide the design of future clinical trials seeking approval from the Food and Drug Administration. Our workgroup suggests diagnosing catheter-related bloodstream infection in catheter-dependent patients on hemodialysis with a clinical suspicion of infection (fever, rigors, altered mental status, or unexplained hypotension), blood cultures growing the same organism from the catheter hub and a peripheral vein (or the dialysis bloodline), and absence of evidence for an alternative source of infection. Catheter dysfunction is defined as the inability of a central venous catheter to (1) complete a single dialysis session without triggering recurrent pressure alarms or (2) reproducibly deliver a mean dialysis blood flow of >300 ml/min (with arterial and venous pressures being within the hemodialysis unit parameters) on two consecutive dialysis sessions or provide a Kt/V≥1.2 in 4 hours or less. Catheter dysfunction is defined only if it persists, despite attempts to reposition the patient, reverse the arterial and venous lines, or forcefully flush the catheter. Central vein obstruction is suspected in patients with >70% stenosis of a central vein by contrast venography or the equivalent, ipsilateral upper extremity edema, and an existing or prior history of a central venous catheter. There is some uncertainty about the specific criteria for these diagnoses, and the workgroup has also proposed future high-priority studies to resolve these questions.
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Affiliation(s)
- Michael Allon
- Due to the number of contributing authors, the affiliations are provided in the Supplemental Material
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