Lauren K Truby1, Maryjane A Farr2, A Reshad Garan2, Raymond Givens2, Susan W Restaino2, Farhana Latif2, Hiroo Takayama3, Yoshifumi Naka3, Koji Takeda3, Veli K Topkara2. 1. Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC (L.K.T.). 2. Division of Cardiology, Department of Medicine (M.A.F., A.R.G., R.G., S.W.R., F.L., V.K.T.), Columbia University College of Physicians and Surgeons, New York, NY. 3. Division of Cardiothoracic Surgery, Department of Surgery (H.T., Y.N., K.T.), Columbia University College of Physicians and Surgeons, New York, NY.
Abstract
BACKGROUND: Bridge to transplantation (BTT) with left ventricular assist devices (LVADs) is a mainstay of therapy for heart failure in patients awaiting heart transplantation (HT). Criteria for HT listing do not differ between patients medically managed and those mechanically bridged to HT. The objectives of the present study were to evaluate the impact of BTT with LVAD on posttransplantation survival, to describe differences in causes of 1-year mortality in medically and mechanically bridged patients, and to evaluate differences in risk factors for 1-year mortality between those with and those without LVAD at the time of HT. METHODS: Using the United Network of Organ Sharing database, we identified 5486 adult, single-organ HT recipients transplanted between 2008 and 2015. Patients were propensity matched for likelihood of LVAD at the time of HT. Kaplan-Meier survival estimates were used to assess the impact of BTT on 1- and 5-year mortality. Logistic regression analysis was used to evaluate the odds ratio of 1-year mortality for patients BTT with LVAD compared with those with medical management across clinically significant variables at various thresholds. RESULTS: Early mortality was higher in mechanically bridged patients: 9.5% versus 7.2% mortality at 1 year (P<0.001). BTT patients incurred an increased risk of 1-year mortality with an estimated glomerular filtration rate of 40 to 60 mL·min-1·1.73 m-2 (odds ratio, 1.69; P=0.003) and <40 mL·min-1·1.73 m-2 (odds ratio, 2.16; P=0.005). A similar trend was seen in patients with a body mass index of 25 to 30 kg/m2 (odds ratio, 1.88; P=0.024) and >30 kg/m2 (odds ratio, 2.11; P<0.001). When patients were stratified by BTT status and the presence of risk factors, including age >60 years, estimated glomerular filtration rate <40 mL·min-1·1.73 m-2, and body mass index >30 kg/m2, there were significant differences in 1-year mortality between medium- and high-risk medically and mechanically bridged patients, with 1-year mortality in high-risk BTT patients at 17.6% compared with 10.4% in high-risk medically managed patients. CONCLUSIONS: Bridge to HT with LVAD, although necessary because of organ scarcity and capable of improving wait list survival, confers a significantly higher risk of early posttransplantation mortality. Patients bridged with mechanical support may require more careful consideration for transplant eligibility after LVAD placement.
BACKGROUND: Bridge to transplantation (BTT) with left ventricular assist devices (LVADs) is a mainstay of therapy for heart failure in patients awaiting heart transplantation (HT). Criteria for HT listing do not differ between patients medically managed and those mechanically bridged to HT. The objectives of the present study were to evaluate the impact of BTT with LVAD on posttransplantation survival, to describe differences in causes of 1-year mortality in medically and mechanically bridged patients, and to evaluate differences in risk factors for 1-year mortality between those with and those without LVAD at the time of HT. METHODS: Using the United Network of Organ Sharing database, we identified 5486 adult, single-organ HT recipients transplanted between 2008 and 2015. Patients were propensity matched for likelihood of LVAD at the time of HT. Kaplan-Meier survival estimates were used to assess the impact of BTT on 1- and 5-year mortality. Logistic regression analysis was used to evaluate the odds ratio of 1-year mortality for patientsBTT with LVAD compared with those with medical management across clinically significant variables at various thresholds. RESULTS: Early mortality was higher in mechanically bridged patients: 9.5% versus 7.2% mortality at 1 year (P<0.001). BTTpatients incurred an increased risk of 1-year mortality with an estimated glomerular filtration rate of 40 to 60 mL·min-1·1.73 m-2 (odds ratio, 1.69; P=0.003) and <40 mL·min-1·1.73 m-2 (odds ratio, 2.16; P=0.005). A similar trend was seen in patients with a body mass index of 25 to 30 kg/m2 (odds ratio, 1.88; P=0.024) and >30 kg/m2 (odds ratio, 2.11; P<0.001). When patients were stratified by BTT status and the presence of risk factors, including age >60 years, estimated glomerular filtration rate <40 mL·min-1·1.73 m-2, and body mass index >30 kg/m2, there were significant differences in 1-year mortality between medium- and high-risk medically and mechanically bridged patients, with 1-year mortality in high-risk BTTpatients at 17.6% compared with 10.4% in high-risk medically managed patients. CONCLUSIONS: Bridge to HT with LVAD, although necessary because of organ scarcity and capable of improving wait list survival, confers a significantly higher risk of early posttransplantation mortality. Patients bridged with mechanical support may require more careful consideration for transplant eligibility after LVAD placement.
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