Amlodipine improves vascular function in patients with moderate to severe hypertension.
The long-term effects of amlodipine, a calcium channel blocker, were examined in patients with moderate to severe hypertension. Eighteen never-treated patients with moderate to severe essential hypertension (49 +/- 8 years) were studied. In all patients, forearm blood flow (FBF) was measured by plethysmography before and 6 months after amlodipine treatment. Endothelium-nondependent and endothelium-dependent vasodilations were assessed by intrabrachial infusion of sodium nitroprusside (SNP) and acetylcholine (ACh), respectively. FBF modification by vitamin C, an oxygen radical scavenger, was also assessed under ACh infusion. The results were compared with those of 13 normal subjects. Blood pressure was significantly lowered (from 176 +/- 17/97 +/- 13 to 144 +/- 12/82 +/- 10 mm Hg) after treatment (P < 0.01). Forearm vascular resistance was increased in the hypertensive patients before treatment; however, it was normalized after treatment during SNP infusion and was improved during ACh infusion. Since vitamin C improved FBF under ACh infusion both before and after the amlodipine treatment, it is suggested that the production of free radicals was not canceled by amlodipine. The analysis of heart rate variability showed that amlodipine does not activate sympathetic nerve function. Therefore, amlodipine is effective in lowering blood pressure associated with the improvement of vascular function, and is suggested to be an effective antihypertensive agent for patients with moderate to severe hypertension.
Ohtsuka
Sadanori
S
Cardiovascular Division, Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Ten-noudai, Tsukuba-shi, Ibaraki-ken, 305-8575 Tsukuba, Japan. otk-sa@md.tsukuba.ac.jp
Yamazaki
Akira
A
Oyake
Yasuyuki
Y
Yamaguchi
Iwao
I
D000109:Acetylcholine / Q000494:pharmacology; D000328:Adult; D017311:Amlodipine / Q000627:therapeutic use*; D001794:Blood Pressure / Q000187:drug effects; D002121:Calcium Channel Blockers / Q000627:therapeutic use*; D005260:Female; D005542:Forearm / Q000098:blood supply; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006973:Hypertension / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D010991:Plethysmography; D016896:Treatment Outcome
D002121:Calcium Channel Blockers; D017311:Amlodipine; D000109:Acetylcholine