Although unfractionated heparin is the reference standard of anticoagulation for percutaneous coronary interventions [1], it has several theoretical and clinical limitations. One of its most serious complications is heparininduced thrombocytopenia (HIT), which occurs in 1-3% of patients. Until the recent approval of direct thrombin inhibitors, the management of patients with HIT was confusing. In this issue of Catheterization and Cardiovascular Interventions, Manfredi and coworkers [2] describe four patients with HIT who successfully underwent percutaneous coronary interventions (PCI) with lepirudin, a direct thrombin inhibitor. The cases exemplify the ease with which direct thrombin inhibitors can substitute for heparin during PCI and emphasize the importance of selecting an appropriate alternative anticoagulant in patients with HIT.