Differential effects of azelnidipine and amlodipine on sympathetic nerve activity in patients with primary hypertension

作者：Inomata Jun ichiro; Murai Hisayoshi^*; Kaneko Shuichi; Hamaoka Takuto; Ikeda Tatsunori; Kobayashi Daisuke; Usui Soichiro; Furusho Hiroshi; Sugiyama Yu; Takata Shigeo; Takamura Masayuki

来源：Journal of Hypertension, 2014, 32(9): 1898-1904.

DOI：10.1097/HJH.0000000000000270

• baroreceptor reflex
• calcium channel blocker
• hypertension
• muscle sympathetic nerve activity

Objective: Calcium channel blockers (CCBs) are used as antihypertensive agents and have a strong vasodilatory effect; however, the sympathetic activation mediated by baroreflex might cause adverse effects. A recently developed CCB, azelnidipine, decreases the heart rate (HR) while lowering blood pressure (BP), possibly by inhibiting sympathetic nerve activity in animal models. In this study, we evaluated whether azelnidipine inhibited sympathetic nerve activity, compared to amlodipine, in primary hypertensive patients. %26lt;br%26gt;Design and methods: We conducted a prospective, randomized, open-label, and crossover study of 14 patients. We measured the patients%26apos; BP, HR and baroreflex sensitivity, and directly recorded muscle sympathetic nerve activity (MSNA), via microneurography, after treatment with either CCB for 8 weeks. %26lt;br%26gt;Results: Although systolic and diastolic BPs did not differ between the azelnidipine and amlodipine groups, the HR in the azelnidipine group significantly decreased compared with that in the amlodipine group. MSNA was significantly reduced in the azelnidipine compared with the amlodipine group (47.7 +/- 14.9 vs. 61.5 +/- 10.7 bursts per 100 beats, P %26lt; 0.05). However, no significant difference was observed in terms of the baroreflex control of HR, or MSNA, between the two groups. %26lt;br%26gt;Conclusion: Our data show, first, that azelnidipine, compared with amlodipine, exerted a favorable effect on sympathetic nerve activity, without affecting baroreflex sensitivity, in hypertensive patients. These results indicate that azelnidipine might be useful for treating hypertensive patients, in whom hypertension is complicated by heart failure and ischemic heart disease.

• 出版日期2014-9