Low-dose spironolactone in the management of resistant hypertension: a surveillance study

Methods We have conducted an open observational study of the use of spironolactone 25–50 mg in the management of patients with resistant hypertension. This drug was recommended in 133 patients who were already receiving an angiotensin-blocking drug in addition to other therapies. Results Of these, three defaulted from follow-up and 11 could not tolerate spironolactone. We therefore have outcome data on 119 patients. The addition of spironolactone (median dose 25 mg) was associated with a mean (SD) fall in systolic blood pressure of 21.7 mmHg (24.0; P < 0.001) and diastolic blood pressure of 8.5 mmHg (14.9; P < 0.001). In two patients spironolactone had to be discontinued on account of a rise of serum potassium to above 6.0 mmol/l, whereas overall the mean increase in serum potassium was 0.3 mmol/l. Conclusion With careful monitoring of plasma electrolytes, spironolactone at a low dose is an effective add-in drug in patients with hypertension resistant to a regime that includes an angiotensin-blocking agent.

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