paroxysmal nocturnalnocturnal hemoglobinuriapheochromocytoma paroxysmparoxysmal hypertensionparoxysmal fibrillationparoxysmal nocturnal haematuriaparoxysmal nocturnal hemolysisparoxysmal nocturnal hematuriadefine paroxysmalparoxysmal atrialparoxysmal medical definitionsymptomatic paroxysmal hypertension