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Introduction Heart transplantation (HTx) is a successful treatment strategy for advanced heart failure. Survival rates exceed those achieved by medical therapy alone. Lack of suitable donors and cultural perception remain obstacles for receiving this novel therapy. Methods Overcoming challenges we adopted a first-of-a-kind multicenter HTx program, collaborating between Cardiac Centers in India and the United Arab Emirates (UAE). Patients were worked up as part of our newly established HTx program in the UAE, then referred to India for successful HTx. All post HTx follow-up care was continued in the UAE thereafter. Results We assessed 10 HTx recipients, [90% male; mean age 34 yrs]. Five patients required inotropes while one LVAD support pre transplant. Our data outline short waiting-list time and excellent 3 years clinical outcomes. All patients are maintained on Tacrolimus and Mycophenolate Mofetil. Two patient developed acute rejection (celluar and humoral) with graft dysfunction within 18 months. Seventy percent had non-ischemic cardiomyopathy pre-transplant. Three acquired donor transmitted coronary vascular disease. One patient developed aggressive allograft vasculopathy requiring coronary artery bypass grafting. Acute kidney injury requiring renal replacement therapy occurred in 1 patient. Conclusion Defying logistic challenges, donor availability and long HTx waiting list times, we have established a successful multi-center new concept HTx program with excellent mid-term outcome result. Diverse genetic background is evident in the presence of early coronary vascular disease in young donor hearts, requiring extra care in donor screening. This international collaboration has a promising future for new programs in the Middle East. Funding Acknowledgement Type of funding source: None

Background Approved dose adjustment criteria for apixaban are based on the clinical trial. Adjustments require presence of 2 of 3 criteria. In the ARISTOTLE trial, 4.7% of patients met those criteria. Real world data show much higher utilization of the lower dose. Accurate statistics on the prevalence and predictors of such dosing in the Middle East Gulf region are lacking. Purpose We sought to explore the appropriateness of apixaban dosing and to predict the factors influencing physician dosing strategies at a tertiary care center in our United . Methods We performed a retrospective chart review of patients receiving apixaban for atrial fibrillation from our hospital-based outpatient pharmacy between April 1, 2015 and October 1, 2018. Patients with missing data or on apixaban for other indications were excluded. Results A total of 232 patients were included with a mean follow-up of 400 ± 271 days. The mean age was 66.0 ± 13.2 years, 45.5% female, mean weight 82.4 ± 44.7 kg, mean serum creatinine 1.0 ± 0.4 mg/dL, CHA2DS2VASc 3.7 ± 1.8, and 30.1% were on at least 1 concomitant antiplatelet drug. Seventy three patients (31.3%) received a reduced apixaban dose of 2.5 mg twice daily. Deviation from recommended criteria was seen in a total of 62 patients (26.6%), most being under-dosed (93.5%). The significant predictors of underdosing in our model were older age (risk of under-dosing increases by 7.2% for each additional year of age) and eGFR 30 to 60 mL/min/1.73 m2. Conclusion Under-dosing of apixaban is prevalent in the Middle East Gulf region. Advancing age and eGFR are the main predictors of under-dosing. More education is needed to optimize dosing of apixaban for stroke prevention in AF. Table 1 % Change in Odds Ratio Variables coef. std. error p expected min max Intercept -1.563 0.223 0.000 Age 0.069 0.022 0.002 7.2% 2.5% 12.1% eGFR (30-60 relative to >60) 1.583 0.625 0.011 386.9% 39.6% 1597.8% Table 1. Stepwise logistic regression model for predictors of apixaban underdosing. Adjusted for serum creatinine, weight, BMI, gender, CHADS2-VASc score, concomitant antiplatelets, and eGFR < 30 or > 60 mL/min/m2