Correct Answer: A. Hydrochlorothiazide
Hydrochlorothiazide (HCTZ) is a thiazide diuretic that is contraindicated in patients with gout and elevated uric acid levels. Thiazides impair renal excretion of uric acid by competing with urate for tubular secretion, leading to hyperuricemia and precipitation of acute gout attacks. This is a well-established adverse effect documented in KD Tripathi and Harrison's textbooks. In a patient already presenting with gout and hyperuricemia, HCTZ would worsen both conditions and trigger acute gouty arthritis. Therefore, HCTZ is explicitly avoided in this clinical scenario. The other antihypertensives listed (ACE inhibitors, alpha-blockers, beta-blockers) do not adversely affect uric acid metabolism and are safe choices. In Indian clinical practice, when hypertension coexists with gout, alternative agents like enalapril, prazosin, or atenolol are preferred, with ACE inhibitors being particularly favored as they may have a neutral or even modest uricosuric effect.
Why the other options are wrong
B. Enalapril — Enalapril (ACE inhibitor) is safe and beneficial in gout patients with hypertension. ACE inhibitors do not impair uric acid excretion and may even have a mild uricosuric effect. They are first-line agents in hypertensive patients with gout, especially if renal involvement or proteinuria is present. This is a correct choice, not the answer. C. Prazosin — Prazosin (alpha-1 blocker) has no adverse effect on uric acid metabolism and is safe in gout patients. It does not impair renal urate excretion and can be used as an alternative antihypertensive in this setting. While not first-line, it is a valid option and does not worsen hyperuricemia. D. Atenolol — Atenolol (beta-blocker) is generally safe in gout, though some beta-blockers may slightly elevate uric acid levels. However, atenolol is not contraindicated and is commonly used in Indian practice for hypertensive patients with gout. It does not significantly impair urate excretion like thiazides do, making it an acceptable choice.
High-Yield Facts
- Thiazide diuretics impair renal uric acid excretion by competing with urate at the proximal tubule, causing hyperuricemia and gout precipitation.
- ACE inhibitors (e.g., enalapril) are preferred antihypertensives in gout patients; they do not worsen uric acid levels and may be uricosuric.
- Contraindicated antihypertensives in gout: thiazides, loop diuretics (except furosemide at high doses), and some beta-blockers; avoid these in hyperuricemic patients.
- Alpha-blockers and prazosin are neutral regarding uric acid metabolism and safe alternatives in gout-hypertension coexistence.
- Beta-blockers like atenolol have minimal uricosuric effect and are acceptable, though ACE inhibitors remain preferred in Indian guidelines for gout + hypertension.
Mnemonics
GOUT-SAFE Antihypertensives ACE inhibitors, Alpha-blockers, Beta-blockers (atenolol) are safe. Thiazides and Loop diuretics are NOT safe. Use this when choosing antihypertensives in gout patients. Thiazide Trap in Gout Thiazides Trap urate in the Tubule → hyperuricemia. Remember: Thiazides = Bad for gout. Use loop diuretics or ACE inhibitors instead.
NBE Trap
NBE pairs gout with hypertension to test whether students know that not all antihypertensives are safe—specifically, that thiazides (a common, cheap, first-line agent in general hypertension) are contraindicated in gout. Students may incorrectly choose HCTZ thinking it's a standard antihypertensive without considering the gout context.
Clinical Pearl
In Indian outpatient practice, a patient presenting with both gout and hypertension is commonly seen in metabolic syndrome. Prescribing HCTZ—the cheapest and most accessible diuretic—without checking uric acid levels is a frequent error. Always screen uric acid in hypertensive patients before starting thiazides; if elevated, switch to enalapril or amlodipine to prevent acute gouty attacks and improve long-term renal outcomes.
_Reference: KD Tripathi Pharmacology Ch. 10 (Diuretics & Antihypertensives); Harrison's Principles of Internal Medicine Ch. 356 (Gout & Hyperuricemia)_