Which of the following statements is incorrect regarding pheochromocytoma?

Correct Answer: C. Propranolol is given initially to manage hypertension

The statement that propranolol is given initially to manage hypertension in pheochromocytoma is incorrect. This is a classic NBE trap testing knowledge of the correct pharmacological sequence in pheochromocytoma management. In pheochromocytoma, catecholamine excess causes both α-adrenergic and β-adrenergic effects. If a β-blocker like propranolol is given first without prior α-blockade, unopposed α-adrenergic stimulation occurs, leading to severe hypertensive crisis, coronary vasospasm, and potentially fatal arrhythmias. The correct sequence mandated by all major guidelines (Harrison, Robbins) and Indian clinical practice is: α-blockade first (phenoxybenzamine or doxazosin), followed by β-blockade (propranolol or atenolol) only after adequate α-blockade is achieved and tachycardia develops. This prevents the "unopposed alpha effect" and ensures safe blood pressure control. Surgical excision remains the definitive treatment, performed only after adequate preoperative α and β-blockade to prevent intraoperative catecholamine surge and hypertensive emergency.

Why the other options are wrong

A. Can present as hypertension alone and sometimes with vomiting and pain abdomen — This statement is correct. Pheochromocytoma classically presents with the triad of episodic headache, profuse sweating, and palpitations, but can present with hypertension as the sole finding in ~50% of cases. Abdominal/flank pain and vomiting are recognized presentations due to catecholamine effects and tumor mass effect. This is a true statement and not the incorrect one being tested. B. Diagnosed by urine VMA & catecholamines — This statement is correct. 24-hour urine metanephrines and catecholamines (or plasma free metanephrines) are the gold-standard diagnostic tests for pheochromocytoma, with >95% sensitivity. VMA (vanillylmandelic acid) is an older test but still valid. Imaging (CT/MRI) localizes the tumor. This is accurate diagnostic information and not the incorrect statement. D. Surgical excision is the definitive treatment — This statement is correct. Surgical excision of the pheochromocytoma is the only curative treatment. Medical management (α and β-blockers) is preoperative preparation to prevent intraoperative hypertensive crisis and arrhythmias. After adequate preoperative blockade, laparoscopic or open adrenalectomy is performed. This is the established standard of care in Indian and international practice.

High-Yield Facts

Mnemonics

Alpha BEFORE Beta (ABB rule) Alpha-blocker first → then Beta-blocker. Never give beta-blocker alone in pheochromocytoma. Use this when deciding preoperative drug sequence. PHEO presentation (5 P's) Pressure (hypertension), Headache, Excessive sweating, Operation (surgical cure). Helps recall classic features and management goal.

NBE Trap

NBE pairs propranolol with pheochromocytoma management to trap students who know β-blockers lower blood pressure but miss the critical rule that α-blockade must come first. The trap exploits superficial knowledge of antihypertensive drugs without understanding catecholamine physiology.

Clinical Pearl

In Indian hospitals, many junior doctors and residents still make the error of starting propranolol first in hypertensive pheochromocytoma patients, leading to severe hypertensive emergencies. Always remember: phenoxybenzamine or doxazosin first, then add propranolol only after α-blockade is established and tachycardia appears. This sequence prevents life-threatening catecholamine surges.

_Reference: Harrison Ch. 405 (Pheochromocytoma); Robbins Ch. 24 (Adrenal Medulla); KD Tripathi Ch. 12 (Adrenergic Drugs)_