Increased gain in baroreceptor-heart rate reflex in patients with primary aldosteronism

Masanori Munakata, Akiko Aihara, Yutaka Imai, Ken Omata, Keishi Abe, Kaoru Yoshinaga

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Objective: Reduced baroreflex sensitivity has been reported in several kinds of human hypertension. However, the nature of the baroreceptor-heart rate reflex in hypertension due to excess mineralocorticoid has never been fully explored. Patients and methods: Thirty patients with primary aldosteronism, 60 patients with essential hypertension (World Health organization stages I or II) and 45 normotensive subjects were enrolled. The groups did not differ in mean age. Blood pressure was similar between patients with primary aldosteronism and those with essential hypertension. Blood pressure (Finapres) and the RR interval (ECG) were monitored continuously at rest. The closed loop gain between systolic blood pressure and RR interval variabilities was used to measure the sensitivity of the baroreceptor-heart rate reflex. Results: Baroreflex sensitivity in the group with primary aldosteronism was significantly greater than in the essential hypertensive group, but did not differ significantly between the group with aldosteronism and the normotensive group. Three to four weeks after removal of an adrenal adenoma (n = 25), both systolic and diastolic blood pressure were decreased significantly in the aldosteronism group but were still higher than in the normotensive group. The baroreflex sensitivity was reduced by about 40% after adrenalectomy compared to pre-operative values. The decrease in the baroreflex gain following adrenalectomy was correlated negatively with the decrease in systolic blood pressure (r = -4.00, P= 0.05). Conclusion: These results demonstrate that hypertension due to excess mineralocorti- coids is characterized by an increase in the gain of the baroreceptor-heart rate reflex. The reduction in baroreflex gain following adrenalectomy may delay the normalization of blood pressure.

本文言語English
ページ(範囲)1648-1653
ページ数6
ジャーナルJournal of hypertension
13
12
出版ステータスPublished - 1995 12

ASJC Scopus subject areas

  • 内科学
  • 生理学
  • 循環器および心血管医学

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