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Hydrochlorothiazide and spironolactone in hypertension
Clinical Pharmacology and Therapeutics
|January 1, 1979
Summary
Hydrochlorothiazide and spironolactone effectively lower blood pressure in patients with essential hypertension. Spironolactone, particularly at lower doses, may offer benefits by mitigating side effects associated with hydrochlorothiazide.
Area of Science:
- Cardiology
- Pharmacology
- Nephrology
Background:
- Essential hypertension is a prevalent condition requiring effective management.
- Diuretics like hydrochlorothiazide and spironolactone are commonly used antihypertensives.
- Understanding their comparative efficacy and side effect profiles is crucial for patient care.
Purpose of the Study:
- To evaluate the efficacy and safety of hydrochlorothiazide and spironolactone, alone and in combination, for mild-to-moderate essential hypertension.
- To compare the effects of different spironolactone dosages on blood pressure and serum electrolytes.
- To identify potential benefits of spironolactone in managing side effects associated with hydrochlorothiazide.
Main Methods:
- A double-blind, placebo-controlled study involving 49 patients with essential hypertension.
- Patients received hydrochlorothiazide, spironolactone (100, 200, or 400 mg/day), or a combination therapy after a 4-week placebo washout.
- Blood pressure, serum potassium, and uric acid levels were monitored over twelve weeks.
Main Results:
- 78% of patients achieved target blood pressure reduction (≤107 mm Hg mean arterial pressure or >15 mm Hg decline).
- Hydrochlorothiazide use was associated with hypokalemia (serum potassium <3.5 mEq/L) in 69% of patients.
- Spironolactone at 400 mg/day showed no additional antihypertensive benefit over 100 mg/day but was associated with hyperkalemia in 5.5% of patients. Uric acid levels increased in all patients, more so with hydrochlorothiazide.
Conclusions:
- Both hydrochlorothiazide and spironolactone are effective antihypertensive agents.
- Spironolactone (up to 100 mg/day) may be a useful adjunct or alternative to hydrochlorothiazide, especially when potassium loss, elevated uric acid, or impaired carbohydrate tolerance are concerns.
- Lower doses of spironolactone (≤100 mg/day) appear to provide comparable antihypertensive effects to higher doses with a potentially better side effect profile.