Impact of baroreflex on venous return surface.
作者信息
Sakamoto Takafumi, Murayama Yoshinori, Tanaka Atsushi, Sakamoto Kazuo, Tobushi Tomoyuki, Saku Keita, Hosokawa Kazuya, Onitsuka Ken, Fujino Takeo, Sunagawa Kenji
机构信息
Kyushu University, Fukuoka 8128582, Japan.
出版信息
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:4295-6. doi: 10.1109/IEMBS.2011.6091066.
BACKGROUND
Although Guyton's concept of venous return (VR) revolutionized circulatory physiology, the pulmonary circulation is invisible in its original framework. Since the pulmonary circulation is critical in left heart failure, we characterized the VR as a surface described by right (P(RA)) and left atrial (P(LA)) pressures and demonstrated that the VR surface was capable of representing mechanics of pulmonary as well as systemic circulation. However how baroreflex impacts the VR surface remains unknown.
METHODS/RESULTS: In 8 dogs, we isolated the carotid sinuses and replaced both ventricles with pumps. We varied cardiac output, shifted blood distribution between the systemic and pulmonary circulation at carotid sinus pressures (CSP) of 100 or 140 mmHg. The coefficient of determination of the VR surface ranged 0.96-0.99 indicating how flat the surface is. Increasing CSP decreased maximum VR (233 ± 27 vs. 216 ± 33 ml/kg/min, p<0.05), whereas did not change the slopes of VR along P(RA) or P(LA) axes.
CONCLUSIONS
Baroreflex parallel shifts the VR surface, thereby stressed volume, without changing its slopes.
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