Changes in vascular properties, not ventricular properties, predominantly contribute to baroreflex regulation of arterial pressure

Takafumi Sakamoto, Takamori Kakino, Kazuo Sakamoto, Tomoyuki Tobushi, Atsushi Tanaka, Keita Saku, Kazuya Hosokawa, Ken Onitsuka, Yoshinori Murayama, Takaki Tsutsumi, Tomomi Ide, Kenji Sunagawa

研究成果: ジャーナルへの寄稿学術誌査読

31 被引用数 (Scopus)

抄録

Baroreflex modulates both the ventricular and vascular properties and stabilizes arterial pressure (AP). However, how changes in those mechanical properties quantitatively impact the dynamic AP regulation remains unknown. We developed a framework of circulatory equilibrium, in which both venous return and cardiac output are expressed as functions of left ventricular (LV) end-systolic elastance (Ees), heart rate (HR), systemic vascular resistance (R), and stressed blood volume (V). We investigated the contribution of each mechanical property using the framework of circulatory equilibrium. In six anesthetized dogs, we vascularly isolated carotid sinuses and randomly changed carotid sinus pressure (CSP), while measuring the LV Ees, aortic flow, right and left atrial pressure, and AP for at least 60 min. We estimated transfer functions from CSP to Ees, HR, R, and V in each dog. We then predicted these parameters in response to changes in CSP from the transfer functions using a data set not used for identifying transfer functions and predicted changes in AP using the equilibrium framework. Predicted APs matched reasonably well with those measured (r2= 0.85–0.96, P < 0.001). Sensitivity analyses indicated that Ees and HR (ventricular properties) accounted for 14 ± 4 and 4 ± 2%, respectively, whereas R and V (vascular properties) accounted for 32 ± 4 and 39 ± 4%, respectively, of baroreflex-induced AP regulation. We concluded that baroreflex-induced dynamic AP changes can be accurately predicted by the transfer functions from CSP to mechanical properties using our framework of circulatory equilibrium. Changes in the vascular properties, not the ventricular properties, predominantly determine baroreflex-induced AP regulation.

本文言語英語
ページ(範囲)H49-H58
ジャーナルAmerican Journal of Physiology - Heart and Circulatory Physiology
308
1
DOI
出版ステータス出版済み - 2015

!!!All Science Journal Classification (ASJC) codes

  • 生理学
  • 循環器および心血管医学
  • 生理学(医学)

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