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Quint EE, Liu Y, Shafaat O, Ghildayal N, Crosby H, Kamireddy A, Pol RA, Orandi BJ, Segev DL, Weiss CR, McAdams-DeMarco MA. Abdominal computed tomography measurements of body composition and waitlist mortality in kidney transplant candidates. Am J Transplant 2024; 24:591-605. [PMID: 37949413 PMCID: PMC10982050 DOI: 10.1016/j.ajt.2023.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 10/10/2023] [Accepted: 11/02/2023] [Indexed: 11/12/2023]
Abstract
Body mass index is often used to determine kidney transplant (KT) candidacy. However, this measure of body composition (BC) has several limitations, including the inability to accurately capture dry weight. Objective computed tomography (CT)-based measures may improve pre-KT risk stratification and capture physiological aging more accurately. We quantified the association between CT-based BC measurements and waitlist mortality in a retrospective study of 828 KT candidates (2010-2022) with clinically obtained CT scans using adjusted competing risk regression. In total, 42.5% of candidates had myopenia, 11.4% had myopenic obesity (MO), 68.8% had myosteatosis, 24.8% had sarcopenia (probable = 11.2%, confirmed = 10.5%, and severe = 3.1%), and 8.6% had sarcopenic obesity. Myopenia, MO, and sarcopenic obesity were not associated with mortality. Patients with myosteatosis (adjusted subhazard ratio [aSHR] = 1.62, 95% confidence interval [CI]: 1.07-2.45; after confounder adjustment) or sarcopenia (probable: aSHR = 1.78, 95% CI: 1.10-2.88; confirmed: aSHR = 1.68, 95% CI: 1.01-2.82; and severe: aSHR = 2.51, 95% CI: 1.12-5.66; after full adjustment) were at increased risk of mortality. When stratified by age, MO (aSHR = 2.21, 95% CI: 1.28-3.83; P interaction = .005) and myosteatosis (aSHR = 1.95, 95% CI: 1.18-3.21; P interaction = .038) were associated with elevated risk only among candidates <65 years. MO was only associated with waitlist mortality among frail candidates (adjusted hazard ratio = 2.54, 95% CI: 1.28-5.05; P interaction = .021). Transplant centers should consider using BC metrics in addition to body mass index when a CT scan is available to improve pre-KT risk stratification at KT evaluation.
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Affiliation(s)
- Evelien E Quint
- Division of Transplant Surgery, Department of Surgery, University Medical Center Groningen, Groningen, The Netherlands
| | - Yi Liu
- Department of Surgery, New York University Grossman School of Medicine, New York, NY, USA
| | - Omid Shafaat
- Division of Vascular and Interventional Radiology, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Nidhi Ghildayal
- Department of Surgery, New York University Grossman School of Medicine, New York, NY, USA
| | - Helen Crosby
- Department of Surgery, New York University Grossman School of Medicine, New York, NY, USA
| | - Arun Kamireddy
- Division of Vascular and Interventional Radiology, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Robert A Pol
- Division of Transplant Surgery, Department of Surgery, University Medical Center Groningen, Groningen, The Netherlands
| | - Babak J Orandi
- Division of Endocrinology, Joan & Sanford Weill Medical College of Cornell University, New York, NY, USA
| | - Dorry L Segev
- Department of Surgery, New York University Grossman School of Medicine, New York, NY, USA; Department of Population Health, New York University Grossman School of Medicine, New York, NY, USA
| | - Clifford R Weiss
- Division of Vascular and Interventional Radiology, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Mara A McAdams-DeMarco
- Department of Surgery, New York University Grossman School of Medicine, New York, NY, USA; Department of Population Health, New York University Grossman School of Medicine, New York, NY, USA.
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Harhay MN, Kim Y, Milliron BJ, Robinson LF. Obesity Weight Loss Phenotypes in CKD: Findings From the Chronic Renal Insufficiency Cohort Study. Kidney Int Rep 2023; 8:1352-1362. [PMID: 37441488 PMCID: PMC10334404 DOI: 10.1016/j.ekir.2023.04.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 04/21/2023] [Accepted: 04/24/2023] [Indexed: 07/15/2023] Open
Abstract
Introduction Although people with chronic kidney disease (CKD) and obesity have important motivations to lose weight, weight loss is also associated with health risks. We examined whether patterns of change in systolic blood pressure (SBP), serum albumin level, and fat-free mass (FFM) can help to differentiate between healthy and high-risk weight loss in this population. Methods Using data from the Chronic Renal Insufficiency Cohort Study (CRIC), we estimated a joint multivariate latent class model with 6 classes to identify distinct trajectories of body mass index (BMI), albumin, and SBP among participants with obesity (BMI ≥30 kg/m2 at baseline), accounting for informative missingness from death. In a secondary analysis, we fit a 6-class model with BMI and FFM. Results Among 2831 participants (median baseline BMI 35.6, interquartile range [IQR] 32.4-40.0 kg/m2), median follow-up was 6.8 (IQR 4.8-12.9) years, median age was 61 (IQR 54-67) years, 53% were male, 50% were non-Hispanic Black, and 82% were trying to control or lose weight at baseline. Latent classes were associated with mortality risk (5-year cumulative incidence of mortality 6.8% and 1.5% in class 6 and 3, respectively). Class 6 had the highest mortality rate and was characterized by early, steep BMI loss, early serum albumin decline, and late SBP increase. In the secondary analysis, a class characterized by steep BMI and FFM loss was associated with the highest death risk. Conclusions Among adults with CKD and obesity, BMI loss with concomitant serum albumin or FFM loss was associated with a high risk of death.
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Affiliation(s)
- Meera N. Harhay
- Department of Medicine, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA
- Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, Pennsylvania, USA
- Department of Medicine, University of Pennsylvania Transplant Institute, University of Pennsylvania Philadelphia, Pennsylvania, USA
| | - Yuna Kim
- Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, Pennsylvania, USA
| | - Brandy-Joe Milliron
- Department of Nutrition Sciences, Drexel University College of Nursing and Health Professions, Philadelphia, PA
| | - Lucy F. Robinson
- Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, Pennsylvania, USA
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Lee JH, McDonald EO, Harhay MN. Obesity Management in Kidney Transplant Candidates: Current Paradigms and Gaps in Knowledge. Adv Chronic Kidney Dis 2021; 28:528-541. [PMID: 35367021 DOI: 10.1053/j.ackd.2021.09.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 09/07/2021] [Accepted: 09/16/2021] [Indexed: 12/18/2022]
Abstract
In this review, we discuss the increasing prevalence of obesity among people with chronic and end-stage kidney disease (ESKD) and implications for kidney transplant (KT) candidate selection and management. Although people with obesity and ESKD receive survival and quality-of-life benefits from KT, most KT programs maintain strict body mass index (BMI) cutoffs to determine transplant eligibility. However, BMI does not distinguish between visceral adiposity, which confers higher cardiovascular risks and risks of perioperative and adverse posttransplant outcomes, and muscle mass, which is protective in ESKD. Furthermore, requirements for patients with obesity to lose weight before KT should be balanced with the findings of numerous studies that show weight loss is a risk factor for death among patients with ESKD, independent of starting BMI. Data suggest that KT is associated with survival benefits relative to remaining on dialysis for candidates with obesity although recipients without obesity have higher delayed graft function rates and longer transplant hospitalization durations. Research is needed to determine the optimal body composition metrics for KT candidacy assessments and risk stratification. In addition, ESKD-specific obesity management guidelines are needed that will address the neurologic, behavioral, socioeconomic, and physical underpinnings of this increasingly common disease.
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Harhay MN, Chen X, Chu NM, Norman SP, Segev DL, McAdams-DeMarco M. Pre-Kidney Transplant Unintentional Weight Loss Leads to Worse Post-Kidney Transplant Outcomes. Nephrol Dial Transplant 2021; 36:1927-1936. [PMID: 33895851 DOI: 10.1093/ndt/gfab164] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Weight loss before kidney transplant (KT) is a known risk factor for weight gain and mortality; however, whereas unintentional weight loss is a marker of vulnerability, intentional weight loss might improve health. We tested whether pre-KT unintentional and intentional weight loss have differing associations with post-KT weight gain, graft loss, and mortality. METHODS Among 919 KT recipients from a prospective cohort study, we used adjusted mixed effects models to estimate post-KT BMI trajectories, and Cox models to estimate death-uncensored graft loss, death-censored graft loss, and all-cause mortality by one-year pre-KT weight change category [stable weight (change≤5%), intentional weight loss (loss>5%), unintentional weight loss (loss>5%), and weight gain (gain>5%)]. RESULTS Mean age was 53 years, 38% were Black, and 40% were female. In the pre-KT year, 62% of recipients had stable weight, 15% had weight gain, 14% had unintentional weight loss, and 10% had intentional weight loss. In the first three years post-KT, BMI increases were similar among those with pre-KT weight gain and intentional weight loss, and lower compared to those with unintentional weight loss (difference +0.79 kg/m2/year, 95% CI: 0.50-1.08 kg/m2/year, p < 0.001). Only unintentional weight loss was independently associated with higher death-uncensored graft loss (adjusted Hazard Ratio [aHR]=1.80, 95% CI:1.23-2.62), death-censored graft loss (aHR=1.91, 95% CI:1.12-3.26) and mortality (aHR=1.72, 95% CI:1.06-2.79) relative to stable pre-KT weight. CONCLUSIONS This study suggests that unintentional, but not intentional, pre-KT weight loss is an independent risk factor for adverse post-KT outcomes.
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Affiliation(s)
- Meera N Harhay
- Department of Medicine, Drexel University College of Medicine, Philadelphia, PA, USA.,Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, PA, USA.,Tower Health Transplant Institute, Tower Health System, West Reading, PA, USA
| | - Xiaomeng Chen
- Department of Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Nadia M Chu
- Department of Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.,Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Silas P Norman
- Department of Medicine, Division of Nephrology, University of Michigan, Ann Arbor, MI, USA
| | - Dorry L Segev
- Department of Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.,Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Mara McAdams-DeMarco
- Department of Surgery, Johns Hopkins School of Medicine, Baltimore, MD, USA.,Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
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Harhay MN, Ranganna K, Boyle SM, Brown AM, Bajakian T, Levin Mizrahi LB, Xiao G, Guy S, Malat G, Segev DL, Reich D, McAdams-DeMarco M. Association Between Weight Loss Before Deceased Donor Kidney Transplantation and Posttransplantation Outcomes. Am J Kidney Dis 2019; 74:361-372. [PMID: 31126666 PMCID: PMC6708783 DOI: 10.1053/j.ajkd.2019.03.418] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 03/07/2019] [Indexed: 12/25/2022]
Abstract
RATIONALE & OBJECTIVE There is debate on whether weight loss, a hallmark of frailty, signals higher risk for adverse outcomes among recipients of deceased donor kidney transplantation (DDKT). STUDY DESIGN Retrospective cohort study. SETTING & PARTICIPANTS Using national Organ Procurement and Transplantation Network data, we included all DDKT recipients in the United States between December 4, 2004, and December 3, 2014, who were adults (aged ≥ 18 years) when listed for DDKT. EXPOSURES Relative pre-DDKT weight change as a continuous predictor and categorized as <5% weight change from listing to DDKT, ≥5% to <10% weight loss, ≥10% weight loss, ≥5% to <10% weight gain, and ≥10% weight gain. OUTCOMES We examined 3 post-DDKT outcomes: (1) transplant hospitalization length of stay (LOS) in days, (2) all-cause graft failure, and (3) mortality. ANALYTIC APPROACH Unadjusted fractional polynomial methods, multivariable log-gamma models, and multivariable Cox proportional hazards models. RESULTS Among 94,465 recipients of DDKT, median pre-DDKT weight change was 0 (interquartile range, -3.5 to +3.9) kg. There were nonlinear unadjusted associations between relative pre-DDKT weight loss and longer transplant hospitalization LOS, higher all-cause graft loss, and higher mortality. Compared with recipients with <5% pre-DDKT weight change (n = 49,366; 52%), recipients who lost ≥10% of their listing weight (n = 10,614; 11%) had 0.66 (95% CI, 0.23-1.09) days longer average transplant hospitalization LOS (P = 0.003), 1.11-fold higher graft loss (adjusted HR [aHR], 1.11; 95% CI, 1.06-1.17; P < 0.001), and 1.18-fold higher mortality (aHR, 1.18; 95% CI, 1.11-1.25; P < 0.001) independent of recipient, donor, and transplant factors. Pre-DDKT dialysis exposure, listing body mass index category, and waiting time modified the association of pre-DDKT weight change with hospital LOS (interaction P < 0.10), but not with all-cause graft loss and mortality. LIMITATIONS Unmeasured confounders and inability to identify volitional weight change. Also, the higher significance level set to increase the power of detecting interactions with the fixed sample size may have resulted in increased risk for type 1 error. CONCLUSIONS DDKT recipients with ≥10% pre-DDKT weight loss are at increased risk for adverse outcomes and may benefit from augmented support post-DDKT.
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Affiliation(s)
- Meera Nair Harhay
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA; Department of Epidemiology and Biostatistics, Drexel University Dornsife School of Public Health, Philadelphia, PA.
| | - Karthik Ranganna
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA
| | - Suzanne M Boyle
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA
| | - Antonia M Brown
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA
| | - Thalia Bajakian
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA
| | - Lissa B Levin Mizrahi
- Division of Nephrology and Hypertension, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA
| | - Gary Xiao
- Division of Multiorgan Transplantation, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA
| | - Stephen Guy
- Division of Multiorgan Transplantation, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA
| | - Gregory Malat
- Division of Multiorgan Transplantation, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA
| | - Dorry L Segev
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
| | - David Reich
- Division of Multiorgan Transplantation, Department of Surgery, Drexel University College of Medicine, Philadelphia, PA
| | - Mara McAdams-DeMarco
- Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD
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Lentine KL. Opponent's comments. Nephrol Dial Transplant 2015; 30:1809-10. [PMID: 26359196 DOI: 10.1093/ndt/gfv329a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Krista L Lentine
- Center for Outcomes Research, Saint Louis University School of Medicine, St Louis, MO, USA Abdominal Transplantation, Saint Louis University School of Medicine, St Louis, MO, USA
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Detwiler RK. Con: Weight loss prior to transplant: no. Nephrol Dial Transplant 2015; 30:1805-9. [DOI: 10.1093/ndt/gfv329] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 07/11/2015] [Indexed: 12/20/2022] Open
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Abstract
Obesity confers increased risk for graft loss and death among renal transplant recipients. However the relationship of changes in body weight and composition to outcome on the transplant waitlist and post-transplantation is not straightforward. Strategies to manage weight in the waitlisted patient and after kidney transplantation must be performed in the context of a multidisciplinary approach and individualized based on risk factors in particular patients. Although retrospective studies offer considerable insights into the relationship between obesity and kidney transplant outcome, causal inferences must be made with great caution.
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Affiliation(s)
- Titte R Srinivas
- Division of Nephrology, Medical University of South Carolina, Charleston, SC 29425, USA.
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Lentine KL, Delos Santos R, Axelrod D, Schnitzler MA, Brennan DC, Tuttle-Newhall JE. Obesity and kidney transplant candidates: how big is too big for transplantation? Am J Nephrol 2012; 36:575-86. [PMID: 23221167 DOI: 10.1159/000345476] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Accepted: 10/24/2012] [Indexed: 12/11/2022]
Abstract
Obesity impacts many inter-related, and sometimes conflicting, considerations for transplant practice. In this article, we describe an approach for applying available data on the importance of body composition to the kidney transplant population that separates implications for candidate selection, risk stratification among selected candidates, and interventions to optimize health of the individual. Transplant recipients with obesity defined by elevated body mass index (BMI) have been shown in many (but not all) studies to experience an array of adverse outcomes more commonly than normal-weight transplant recipients, including wound infections, delayed graft function, graft failure, cardiac disease, and increased costs. However, current studies have not defined limits of body composition that preclude clinical benefit from transplantation compared with long-term dialysis in patients who have passed a transplant evaluation. Formal cost-effectiveness studies are needed to determine if payers and society should be compensating centers for clinical and financial risks of transplanting obese end-stage renal disease patients. Recent studies also demonstrate the limitations of BMI alone as a measure of adiposity, and further research should be pursued to define practical measures of body composition that refine accuracy for outcomes prediction. Regarding individual management, observational registry studies have not found beneficial associations of pretransplant weight loss with patient or graft survival. However, association studies cannot distinguish purposeful from unintentional weight loss as a result of illness and comorbidity. Prospective evaluations of the impact of targeted risk modification efforts in this population including dietary changes, monitored exercise programs, and bariatric surgery are urgently needed.
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Affiliation(s)
- Krista L Lentine
- Center for Outcomes Research, Saint Louis University School of Medicine, St. Louis, MO 63104, USA.
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