Browsing by Author "Taber, Tim"

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    Bamlanivimab for Mild to Moderate COVID-19 in Kidney Transplant Recipients
    (Elsevier, 2021-09) Jan, Muhammad Y.; Sayegh, Skye E.; Webb, Hanna T.; Adebiyi, Oluwafisayo; Anderson, Melissa D.; Mishler, Dennis P.; Yaqub, Muhammad S.; Taber, Tim; Sharfuddin, Asif A.; Medicine, School of Medicine
    Kidney transplant recipients (KTRs) are at an increased risk of hospitalization, complications, and mortality from COVID-19 compared with the general population.1, 2, 3, 4, 5 Among KTRs with COVID-19 in the United States, studies have shown hospitalization rates ranging from 32% to 100%,1,3, 4, 5, 6 intensive care unit (ICU) admission rates from 20% to 61%,2,4 and overall mortality of 13% to 39%.1,2,4, 5, 6 A high incidence of acute kidney injury was noted, ranging from 30% to 89%,2,4, 5, 6 while renal replacement therapy was required in 13% to 21% of patients.1,7 Given the natural history of COVID-19 pneumonia, most of these complications occurred ≥1 week after the diagnosis of COVID-19. Given the high impact of COVID-19 infection on KTRs, early COVID-19–directed therapies are critical. Bamlanivimab (LY-CoV555) was given Emergency Use Authorization (EUA) by the US Food and Drug Administration on November 9, 2020.8 It is a neutralizing IgG1 monoclonal antibody that binds to the receptor-binding domain of the spike protein of SARS-CoV-2, inhibiting attachment to human angiotensin-converting enzyme 2 receptor. This EUA was given for treatment of mild to moderate COVID-19 in patients ≥12 years of age weighing >40 kg who are positive with a direct viral testing for SARS-CoV-2 and have high risk for progressing to severe COVID-19 and/or hospitalization.8 KTRs with COVID-19 are considered high risk because of immunosuppressive medication use.9 Studies on the use of bamlanivimab among KTRs are limited. To provide more insight on the use of bamlanivimab in KTRs we report our experience with 24 KTRs.
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    Long-term outcomes of transplant recipients referred for angiography for suspected transplant renal artery stenosis
    (Wiley, 2015-09) Ali, Anum; Mishler, Dennis; Taber, Tim; Agarwal, David; Yaqub, Muhammad; Mujtaba, Muhammad; Goggins, William; Sharfuddin, Asif; Department of Medicine, IU School of Medicine
    Our aim was to study the long-term outcomes of all transplant recipients who underwent angiography for suspected TRAS at our institution. The patients were divided into TRAS+ve and TRAS−ve groups based upon angiographically confirmed results. TRAS was confirmed in 58.1% of 74 patients with median time of 8.9 months. Primary angioplasty alone was performed in 56% of patients with TRAS, while the remaining had PTA with stent (PTAS). There was reduction in systolic and diastolic BP (165 ± 19–136 ± 15 mmHg and 82 ± 14 mmHg to 68 ± 12 mmHg; p < 0.05) and number of antihypertensive drugs (3.5 ± 0.9–2.7 ± 1.0; p < 0.05). Overall, graft survival and patient survival from time of transplant were similar in both groups. Graft function was similar for the patients with treated TRAS+ve as compared to TRAS−ve over time. Graft survival and patient survival when compared to an age- and year of transplant-matched cohort control group were also similar. In conclusion, angiography for suspected TRAS is more likely to yield a confirmatory result early in the transplant course as compared to late. Treatment of TRAS in these patients had sustained long-term graft function. Alternative etiologies of HTN and graft dysfunction should be sought for recipients further out from transplant.
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    Neutropenic fever in COVID-19 in kidney transplant patient
    (Wiley, 2021-01) Al-Makki, Akram; Taber, Tim; Medicine, School of Medicine
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    Patient and Graft Survival Outcomes During 2 Eras of Immunosuppression Protocols in Kidney Transplantation: Indiana University Retrospective Cohort Experience
    (Elsevier, 2021-12) Adebiyi, Oluwafisayo; Umukoro, Peter; Sharfuddin, Asif; Taber, Tim; Chen, Jeanne; Lane, Kathleen A.; Li, Xiaochun; Goggins, Williams; Yaqub, Muhammad S.; Biostatistics, School of Public Health
    Background Since 1964 when Indiana University performed its first kidney transplant, immunosuppression protocol was steroid-based until 2004 when steroid-free immunosuppression protocol was adopted. We describe clinical outcomes on our patients administered early steroid withdrawal (ESW) protocol (5 days) compared with our historical cohort (HC), who were on chronic steroid-based immunosuppression. Methods We performed a retrospective study evaluating kidney transplant recipients between 1993 and 2003 (HC, n = 1689) and between 2005 and 2016 (ESW cohort, n = 2097) at the Indiana University program, with a median follow-up of 10.5 years and 6.1 years, respectively. Primary outcomes were patient and death-censored graft survival at 1, 3, and 5 years in both study cohorts. Secondary outcomes were 1-year rates of biopsy-proven acute rejection; graft function at 1, 3, and 5 years; and risk of post-transplant infection (BK virus and cytomegalovirus) in the ESW cohort. Cox proportional model and Kaplan-Meier estimates were used to estimate survival probabilities. Fisher exact tests were used to compare episodes of acute rejection in the ESW cohort. Results No difference was observed in patient survival between the ESW and HC cohorts (P = .13). Compared with the ESW cohort, death-censored graft survival was significantly worse in the HC (5 year: 86.4% vs 90.6%, log-rank P < .001). One-year acute rejection reported in the ESW cohort alone was 15.7% and significantly worse in Black patients and younger patients (P < .05). Conclusions In this sizeable single-center cohort study with significant ethnic diversity, ESW is a viable alternative to steroid-based immunosuppression protocol in kidney transplant recipients.
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    Re-exposure to beta cell autoantigens in pancreatic allograft recipients with pre-existing beta cell autoantibodies
    (Wiley, 2015-11) Mujtaba, Muhammad Ahmad; Fridell, Jonathan; Book, Benita; Faiz, Sara; Sharfuddin, Asif; Wiebke, Eric; Rigby, Mark; Taber, Tim; Department of Medicine, IU School of Medicine
    Re-exposure to beta cell autoantigens and its relevance in the presence of donor-specific antibodies (DSA) in pancreatic allograft recipients is not well known. Thirty-three patients requiring a pancreas transplant were enrolled in an IRB approved study. They underwent prospective monitoring for DSA and beta cell autoantibody (BCAA) levels to GAD65, insulinoma-associated antigen 2 (IA-2), insulin (micro-IAA [mIAA]), and islet-specific zinc transporter isoform-8 (ZnT8). Twenty-five (75.7%) had pre-transplant BCAA. Twenty had a single antibody (mIAA n = 15, GAD65 n = 5); five had two or more BCAA (GAD65 + mIAA n = 2, GAD65 + mIAA+IA-2 n = 2, GA65 + mIAA+IA-2 + ZnT8 = 1). No changes in GAD65 (p > 0.29), IA-2 (>0.16), and ZnT8 (p > 0.07) were observed between pre-transplant and post-transplant at 6 or 12 months. A decrease in mIAA from pre- to post-6 months (p < 0.0001), 12 months (p < 0.0001), and from post-6 to post-12 months (p = 0.0002) was seen. No new BCAA was observed at one yr. Seven (21.0%) developed de novo DSA. The incidence of DSA was 24% in patients with BCAA vs. 25% in patients without BCAA (p = 0.69). Pancreatic allograft function of patients with vs. without BCAA, and with and without BCAA + DSA was comparable until last follow-up (three yr). Re-exposure to beta cell autoantigens by pancreas transplant may not lead to increased levels or development of new BCAA or pancreatic allograft dysfunction.
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    Steroid Free Three Drug Maintenance Regimen for Pancreas Transplant Alone: Comparison of Induction with Rabbit Antithymocyte Globulin +/- Rituximab
    (Wiley, 2018) Fridell, Jonathan; Mangus, Richard; Chen, Jeanne; Taber, Tim; Cabrales, Arianna E.; Sharfuddin, Asif; Yaqub, Muhammad; Powelson, John; Surgery, School of Medicine
    Graft survival following pancreas transplant alone (PTA) is inferior to other pancreas transplants. Steroid elimination is appealing, but a two drug maintenance strategy may be inadequate. Additionally, recipients tend to have diabetic nephropathy and do not tolerate nephrotoxic medications. A three‐drug maintenance strategy permits immunosuppression through different mechanisms as well as an opportunity to use lower doses of the individual medications. Induction consisted of five doses of rabbit antithymocyte globulin (1 mg/kg/dose). As of October 2007, a single dose of rituximab (150 mg/m2) was added. Maintenance consisted of tacrolimus, sirolimus and mycophenolate mofetil. From 2004 to 2017, 166 PTA were performed. Graft loss at 7‐ and 90‐ days were 4% and 5%, and one year patient and graft survival were 97% and 91%. Comparing induction without and with rituximab, there was no significant difference in 7 or 90 day graft loss, 1 year patient or graft survival or in the rate of rejection or infection. Rabbit antithymocyte globulin induction and steroid withdrawal followed by a three drug immunosuppression regimen is an excellent strategy for PTA recipients.