Nclextips @ NurseNkem Answer 4 Pheochromocytoma is a condition caused by a tumor in the adrenal medulla. This results in excess release of catecholamines such as epinephrine and norepinephrine, leading to paroxysmal hypertensive crisis. Pheochromocytoma is a condition caused by a tumor in the adrenal medulla that causes release of catecholamines such as epinephrine and norepinephrine, resulting in paroxysmal hypertensive crisis. Hypertensive crisis puts the client at risk for stroke and should be treated promptly with intravenous nitroprusside or another vasodilator (eg, phentolamine, nicardipine). Abdominal palpation should be avoided in these clients.