Abstract
The additive natriuretic and diuretic effects of theophylline ethylenediamine and of bendroflumethiazide have been compared in permutation trial tests in patients with advanced congestive heart failure receiving long-term treatment with the highly potent diuretic, bumetanide. Statistical analysis of renal water and electrolyte excretion revealed that theophylline ethylenediamine, 400 mg orally, and bendroflumethiazide, 5 mg orally, had very similar effects, both quantitatively and qualitatively. The mechanism of action of the supplementary diuretics is discussed. It is concluded that theophylline ethylenediamine represents a useful alternative to thiazide diuretics when supplementary natriuretic treatment is considered in patients with congestive heart failure during long-term treatment with potent diuretics. The significance of maintaining the potassium balance during such a combined regimen is stressed.
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