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ACE inhibitors and diuretics causing hypokalaemia
D F D'Costa1, S K Basu, N P Gunasekera
1Department of Medicine, General Hospital, Kettering, Northamptonshire.
Insights
Angiotensin-converting enzyme (ACE) inhibitors and diuretics can alter potassium levels. This study found that ACE inhibitors, particularly at higher doses, may paradoxically cause hypokalemia in heart failure patients, necessitating careful monitoring.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Angiotensin-converting enzyme (ACE) inhibitors and diuretics are commonly prescribed for heart failure.
- Both drug classes are known to potentially cause electrolyte imbalances, particularly hyperkalemia.
Purpose of the Study:
- To prospectively analyze the incidence of electrolyte disturbances in patients treated with ACE inhibitors and diuretics.
- To investigate the relationship between ACE inhibitor dosage and the development of hypokalemia.
Main Methods:
- Prospective analysis of 217 admitted patients over six months.
- Focused on 39 patients with congestive cardiac failure/left ventricular failure, 21 of whom received ACE inhibitors.
Main Results:
- Seven of 21 patients (33%) on ACE inhibitors developed hypokalemia.
- Hypokalemia was associated with the dose of ACE inhibitor, not the type or dose of diuretic.
- Treatment strategies included potassium-sparing diuretics, potassium supplements, or increased ACE inhibitor dosage.
Conclusions:
- Clinicians should monitor for both hyperkalemia and hypokalemia in patients using combined ACE inhibitors and diuretics.
- Higher doses of ACE inhibitors may increase the risk of hypokalemia in heart failure management.
Abstract:
Angiotensin-converting enzyme (ACE) inhibitors and diuretics are known to cause hyperkalaemia. We undertook a prospective analysis over a period of six months of patients admitted under our care. Of 217 patients, 39 (18 per cent) were admitted with congestive cardiac failure/left ventricular failure. Of these 39 patients, 21 (54 per cent) were prescribed ACE inhibitors. Seven of these 21 patients subsequently developed hypokalaemia. This was irrespective of the type or dose of the diuretic but seemed to be related to the dose of the ACE inhibitor. In three cases the hypokalaemia was corrected by the addition of a potassium-sparing diuretic; in two cases a potassium supplement was added; and in the other three an increase in the dose of the ACE inhibitor for the resistant heart failure corrected the potassium deficit. This study shows that one should be alert to both hyperkalaemia and hypokalaemia when using a combination of ACE inhibitors and diuretics.