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Erythrocyte sodium cannot predict hypotensive effects of calcium channel blockers
T Oshima1, H Matsuura, R Ozono
1Department of Clinical Laboratory Medicine, Hiroshima University School of Medicine, Japan.
Insights
Nilvadipine effectively lowers blood pressure in patients with essential hypertension. Its antihypertensive effect is linked to patient age and plasma renin activity, not intracellular sodium concentration in erythrocytes.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Essential hypertension is a common cardiovascular condition.
- Calcium channel blockers are a key class of antihypertensive drugs.
- The role of intracellular sodium concentration ([Na]i) in hypertension treatment is under investigation.
Purpose of the Study:
- To evaluate the antihypertensive efficacy of nilvadipine, a dihydropyridine calcium channel blocker.
- To investigate the relationship between nilvadipine's hypotensive effect and erythrocyte intracellular sodium concentration ([Na]i).
- To explore correlations between nilvadipine's efficacy and clinical variables like age, body weight, baseline blood pressure, and plasma renin activity.
Main Methods:
- A study involving 21 patients with essential hypertension.
- Administration of nilvadipine and measurement of blood pressure before and after treatment.
- Assessment of erythrocyte intracellular sodium concentration ([Na]i) pre- and post-treatment.
- Correlation analysis between blood pressure reduction and clinical variables, including [Na]i.
Main Results:
- Nilvadipine significantly reduced mean blood pressure (120 +/- 6 to 106 +/- 8 mmHg).
- The hypotensive effect positively correlated with patient age (r=0.67) and inversely with plasma renin activity (r=-0.62).
- No correlation was found between nilvadipine's antihypertensive effect and erythrocyte [Na]i; however, [Na]i levels decreased with treatment.
Conclusions:
- The antihypertensive efficacy of nilvadipine in essential hypertension is predictable by age and renin status.
- Erythrocyte intracellular sodium concentration ([Na]i) did not correlate with nilvadipine's hypotensive effect.
- A significant role for the reduction of [Na]i in the mechanism of action of calcium channel blockers like nilvadipine was not detected in this study.
Abstract:
Antihypertensive efficacy of the calcium channel blocker, nilvadipine, was investigated in 21 patients with essential hypertension in relation to the intracellular sodium concentration ([Na]i) in erythrocytes and clinical variables, such as age, body weight, pretreatment blood pressure and plasma renin activity. Dihydropyridine nilvadipine reduced mean blood pressure from 120 +/- 6 to 106 +/- 8 mmHg (p < 0.01). The hypotensive effect of nilvadipine was positively correlated with age (r = 0.67, p < 0.01) and inversely correlated with plasma renin activity (r = -0.62, p < 0.01), but was not correlated with erythrocyte [Na]i or any other indices. Erythrocyte [Na]i was decreased with nilvadipine treatment (8.27 +/- 1.69 to 7.97 +/- 1.49 mM, p < 0.01). However, no link was found between the change in [Na]i and the hypotensive effect of the drug. In conclusion, the antihypertensive efficacy of nilvadipine was predictable by age and renin status, but not by erythrocyte [Na]i. A significant role of reduction of [Na]i in the hypotensive effect of the calcium channel blockers was not detected.