The effects of aliskiren on blood nitric oxide and bradykinin in essential hypertension patients / 中国医师进修杂志

ABSTRACT

ObjectiveTo investigate the effects of aliskiren on blood nitric oxide(NO) and bradykinin (BK) through analyzing the changes of NO, BK and non-dominant arm blood pressure before and after treatment of aliskiren and ramipril. MethodsThe chnical trial was conducted in 67 patients with essential hypertension. After a single-blind period of taking placebo orally once a day for 2 weeks, the patients were divided into different group in accordance with random table, and all patients were consecutively treated with drugs for 8 weeks. The trial uncovered showed that 17 patients were treated with ramipril (5 mg) in control group. Patients in trial group were given aliskiren and were assigned to three subgroups, 300 mg group (300 mg aliskiren, 16 cases), 150 mg group(150 mg aliskiren, 17 cases) and 75 mg group(75 mg aliskiren, 17 cases). The blood NO and BK before and after treatment in two groups were measured by enzyme linked immunosorbent assay and radioimmunoassay method. Non-dominant arm blood pressure was measured by calibration qualified mercury blood pressure instrument before and after treatment. Results The blood NO after treatment of aliskiren 8 weeks in trial group increased significantly than those before treatment [before treatment, the blood NO in 300 mg group, 150 mg group,75 mg group were (44.414 ±5.841 ), (43.496 ± 5.576), (41.037 ± 5.312) μ mol/L, after treatment they were(60.381 ± 6.756), (56.480 ±6.959), (53.766 ±7.276) μmol/L] (P <0.05). After treatment, non-dominant arm blood pressure decreased significantly in trial group (P < 0.05 ), but the blood BK had no significant defference before and after treatment (P >0.05). The blood NO and BK after treatment of ramipril 8 weeks in control group increased significantly than those before treatment [(57.286 ±6.431) μmol/L vs.(39.935 ±6.388)μ mol/L, (7.120 ± 1.015) μg/L vs.(5.232 ± 1.288) μg/L], and meanwhile non-dominant arm blood pressure decreased significantly(P <0.05). ConclusionsAliskiren and ramipril could increase the concentration of NO remarkably. Ramipril has strong effect in increasing the concentration of BK, but aliskiren hasn't effect on BK.