paroxysmal hemoglobinurianocturnal hemoglobinuriapheochromocytoma paroxysmparoxysmal hypertensionparoxysmal fibrillationparoxysmal nocturnal haematuriaparoxysmal nocturnal diseaseparoxysmal nocturnal hemolysisparoxysmal nocturnal hematuriadefine paroxysmalnocturnal animals definitionnocturnal emission definition