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Magnesium depletion in patients on long-term chlorthalidone therapy for essential hypertension
Insights
Beta-blockers alone did not significantly alter serum electrolytes. However, combining beta-blockers with chlorthalidone led to dangerous reductions in potassium and magnesium, making it a less attractive first-choice hypertension treatment.
Area of Science:
- Cardiology
- Pharmacology
- Nephrology
Background:
- Essential uncomplicated hypertension requires effective long-term treatment.
- Beta-blockers (BB) and chlorthalidone (CTD) are common antihypertensive agents.
- Understanding their metabolic effects is crucial for patient safety.
Purpose of the Study:
- To evaluate the long-term effects of beta-blockers alone versus beta-blockers plus chlorthalidone on serum electrolytes.
- To assess the clinical significance of observed metabolic changes.
Main Methods:
- A 1-year study involving 60 patients with essential uncomplicated hypertension.
- Patients were randomized into two groups: 30 received BB alone, and 30 received BB plus CTD.
- Serum potassium (K+) and magnesium (Mg++) levels were monitored, including Mg++ loading tests.
Main Results:
- Beta-blockers alone showed a marginal, non-clinically significant trend towards Mg++ retention.
- The combination of BB + CTD significantly reduced serum K+ and Mg++.
- Significant Mg++ depletion was confirmed by loading tests in the BB + CTD group.
Conclusions:
- Chlorthalidone in combination with beta-blockers causes clinically significant and potentially dangerous metabolic disturbances.
- These findings suggest that BB + CTD may not be an ideal first-choice treatment for hypertension due to adverse effects on electrolyte balance.
Abstract:
Sixty patients were treated for 1 year for essential uncomplicated hypertension, 30 with beta-blockers alone (BB) and 30 with BB and chlorthalidone (CTD). BB did not affect serum K+ or Mg++. In the BB-group there was a statistically significant trend towards retention of Mg++ in a loading test, but the effect was clinically marginal. BB + CTD reduced serum K+ and Mg++ and caused significant Mg++ depletion, as shown by the Mg++ loading test. All the effects were highly significant and were clinically important. The metabolic perturbations due to CTD are potentially dangerous and make this drug unattractive as 'first choice' treatment for hypertension.