Dosing patterns and outcomes in African American, Asian, and Hispanic patients with heparin-induced thrombocytopenia treated with argatroban.

We retrospectively evaluated dosing patterns and 37-day outcomes in argatroban-treated African American (n = 52), Asian (n = 13), and Hispanic (n = 14) patients with heparin-induced thrombocytopenia (HIT). The Asians required a lesser median dose (1.0 microg/kg/min) than the other groups (1.9 microg/kg/min, each) to achieve comparable activated partial thromboplastin times (medians: 61-69 s). Durations of therapy were similar (medians: 4.0-5.5 days). New thrombosis occurred in 11 (21%) African Americans, 1 (8%) Asian, and 1 (7%) Hispanic; of these 13 patients, 9 (69%) had baseline HIT-related thrombosis. Amputation occurred in 6 (12%) African Americans and 3 (21%) Hispanics; of these nine patients, 6 (67%) had diabetes. One (2%) African American and 1 (7%) Hispanic died from thrombosis. The composite of death due to thrombosis, amputation due to ischemic complications of HIT, or new thrombosis occurred in 14 (27%) African Americans, 1 (8%) Asian, and 4 (29%) Hispanics. Two (4%) African Americans and none others (0%) had major bleeding. These findings suggest that despite argatroban anticoagulation, African Americans and Hispanics may have worse outcomes in HIT than Asians. In minority patients with adverse HIT outcomes, baseline HIT-related thrombosis or diabetes is often present.