RT Journal Article SR Electronic T1 Effect of potassium-sparing diuretics on the renin-angiotensin-aldosterone system and potassium retention in heart failure. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1025 OP 1030 DO 10.1136/hrt.38.10.1025 VO 38 IS 10 A1 M G Nicholls A1 E A Espiner A1 H Hughes A1 T Rogers YR 1976 UL http://heart.bmj.com/content/38/10/1025.abstract AB The renin-angiotensin-aldosterone system and electrolyte levels in 11 patients with heart failure controlled on digoxin and frusemide were investigated after separate periods of Slow K, spironolactone, and amiloride therapy. When spironolactone or amiloride replaced Slow K, distinct parallel increments in the levels of renin, angiotensin II, and aldosterone resulted. Though plasma potassium was generally higher after spironolactone and amiloride than after Slow K, exchangeable potassium was similar with the three regimens. There was no significant relation between plasma potassium and concurrent exchangeable potassium.