“…For all other studies, major bleeding was defined as that severe enough to require blood transfusion, surgery, or pericardial drainage. 12,17,18,[20][21][22] In the COMPARE study 7 of continuous vs interrupted warfarin, major bleeding was defined more broadly as cardiac tampo-nade, hematoma requiring intervention, massive hemoptysis, hemothorax, retroperitoneal bleeding, need for transfusion, or bleeding causing symptoms. As reported in Table 1, follow-up for bleeding end points ranged from inhospital to as much as 90 days.…”