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Effect of long-term nifedipine treatment on body fluid composition in essential hypertension
1University of Copenhagen, Medical Department C, Glostrup Hospital, Denmark.
Insights
Nifedipine effectively lowers blood pressure in patients with essential hypertension. Peripheral edema observed with nifedipine is not explained by sodium and water retention.
Area of Science:
- Cardiovascular Medicine
- Pharmacology
Background:
- Essential hypertension is a common condition requiring effective treatment.
- Calcium channel blockers, like nifedipine, are used to manage hypertension.
- Understanding the effects of nifedipine on body fluid composition is crucial for managing side effects.
Purpose of the Study:
- To evaluate the antihypertensive efficacy of nifedipine monotherapy.
- To investigate the impact of nifedipine on body fluid composition.
- To explore the mechanism behind peripheral edema associated with nifedipine.
Main Methods:
- A study involving 15 patients with essential hypertension.
- Monotherapy with the calcium antagonist nifedipine was administered.
- Measurements included blood pressure, glomerular filtration rate, and body fluid volumes.
Main Results:
- Nifedipine significantly decreased both systolic and diastolic blood pressure by approximately 12%.
- No significant changes were observed in glomerular filtration rate, plasma volume, or extracellular fluid volume.
- Flushing and peripheral edema were the most common side effects, occurring in 4 and 3 patients, respectively.
Conclusions:
- Nifedipine demonstrates significant antihypertensive efficacy in essential hypertension.
- The development of peripheral edema with nifedipine is not attributed to sodium and water retention.
- Further research may be needed to elucidate the exact mechanism of nifedipine-induced peripheral edema.
Abstract:
The antihypertensive efficacy and effects on body fluid composition of monotherapy with the calcium antagonist nifedipine were investigated in 15 patients with essential hypertension. The systolic as well as the diastolic blood pressure decreased significantly, by approximately 12%, during nifedipine treatment with a mean dose of 56 mg. Glomerular filtration rate, plasma volume, extracellular fluid volume, and the ratio plasma to interstitial fluid volume did not change significantly. The most frequently observed side-effects were flushing and peripheral oedema which occurred in four and three patients, respectively. These results indicate that sodium and water retention, which is often observed during long-term treatment with vasodilators, does not seem to be the explanation of the development of peripheral oedema seen with nifedipine.