In performing pulmonary endarterectomy (PEA) for a patient with chronic thromboembolic pulmonary hypertension (CTEPH), we encountered methemoglobinemia that was unmasked by hypothermia while on cardiopulmonary bypass.
We report the successful control of bleeding in two patients who underwent post-cardiotomy extracorporeal circulatory support (ECMO) and then developed life-threatening bleeding due to severe coagulopathy.