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Advantages and limitations of diuretic therapy in essential hypertension
G Leonetti1, L Terzoli, R Bragato
1Istituto di Clinica Medica Generale e Terapia Medica, Università di Milano, Italy.
Insights
Diuretics, once a cornerstone of hypertension treatment, are being reevaluated. While thought to cause cardiac issues, evidence is lacking; lower doses may mitigate side effects without losing efficacy.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Diuretics were historically central to antihypertensive therapy.
- Recent epidemiological studies question their cardioprotective effects.
- Potential mechanisms include potassium reduction and lipoprotein changes.
Purpose of the Study:
- To reevaluate the role of diuretics in antihypertensive therapy.
- To investigate the evidence linking potassium and lipoprotein changes to a lack of cardioprotection.
- To explore alternative explanations for cardiac effects.
Main Methods:
- Review of epidemiological studies and clinical evidence.
- Analysis of proposed mechanisms of diuretic interference.
- Consideration of alternative hypotheses for cardiac effects.
Main Results:
- No consistent clinical evidence supports potassium or lipoprotein changes as the cause of lacking cardioprotection.
- Reflex sympathetic nervous system activation or renin secretion may be involved.
- High historical doses of diuretics may have contributed to adverse effects.
Conclusions:
- The presumed negative cardiac effects of diuretics lack robust clinical evidence.
- Lowering diuretic doses can minimize electrolyte and lipoprotein changes without compromising antihypertensive efficacy.
- Alternative mechanisms for cardiac effects during antihypertensive therapy should be considered.
Abstract:
The diuretics previously considered the "cornerstone" of the antihypertensive treatment have recently undergone a reevaluation and have been considered as a potential cause of the lack of "cardioprotection" found in different epidemiological studies. The reduction in plasma potassium and the changes in lipoproteins should represent the mechanisms of the negative interference of diuretics at cardiac levels. In spite of this common opinion, there is no clinically consistent evidence that the lowering of serum potassium and the changes in lipoproteins are responsible for the lack of cardioprotection during antihypertensive therapy. It is possible that other causes, for instance the reflex activation of sympathetic nervous system and/or renin secretion, may play an important role in determining the cardiac effects of antihypertensive therapy. However, it is also true that diuretics have been used in the past at doses that were too high, and the changes in serum potassium and lipoproteins can be minimized by administering lower doses of diuretics without decreasing their antihypertensive efficacy.