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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 (CP. The patient on dapsone therapy for antiphospholipid antibody syndrome had developed acquired methemoglobinemia that went undiagnosed because her cyanosis was believed to be due to CTEPH and the resulting ventilation-perfusion (V/Q) mismatch. Although pharmacological triggers for methemoglobin are well known, causatio