Cardiac transplantation after heparin-induced thrombocytopenia: A systematic review

Purpose Heparin-induced thrombocytopenia (HIT) presents a unique challenge in patients requiring orthotopic heart transplantation (OHT). We sought to pool the existing evidence in a systematic review. Methods Electronic search was performed to identify all relevant studies on OHT in patients with HIT. Patient-level data for 33 patients from 21 studies were extracted for statistical analysis. Results Median patient age was 51 [IQR 41, 55] years, with 75.8% (25/33) males. All patients had a clinical diagnosis of HIT, and anti-PF4/Heparin antibodies were positive in 87.9% (29/33). Median lowest reported platelet count was 46 x 10(9)/L [27.2, 73.5]. Intraoperatively, 61% (20/33) of patients were given unfractionated heparin (UFH), while 39% (13/33) were given alternative anticoagulants. The alternative agent subgroup required more antifibrinolytics [54% (7/13) vs 10% (2/20), P = .02] and clotting factors [69.2% (9/13) vs 15.0% (3/20), P < .01]. Perioperative thrombosis occurred more [53.8% (7/13) vs 0% (0/20, P < .01) in alternate agent subgroup. More patients in the alternate agent subgroup required post-operative transfusions [54% (7/13) vs 0% (0/20), P < .01]. Thirty-day mortality of 15.2% (5/33) was comparable between the subgroups. Conclusion Heparin use during OHT may be associated with less adverse effects compared to use of other anticoagulants with no difference in 30-day mortality.