Left ventricular reflex control of venous return and systemic vascular capacitance in dogs

S. Hoka, Z. J. Bosnjak, J. L. Seagard, D. Siker, B. W. Palmisano, R. L. Coon, J. P. Kampine

研究成果: Contribution to journalArticle

1 被引用数 (Scopus)

抄録

The reflex effects of left ventricular distension on venous return, vascular capacitance, vascular resistance, and sympathetic efferent nerve activity were examined in dogs anesthetized with sodium pentobarbital. In addition, the interaction of left ventricular distension and the carotid sinus baroreflex was examined. Vascular capacitance was assessed by measuring changes in systemic blood volume, using extracorporeal circulation with constant cardiac output and constant central venous pressure. Left ventricular distension produced by balloon inflation caused a transient biphasic change in venous return; an initial small increase was followed by a late relatively large decrease. Left ventricular distension increased systemic blood volume by 3.8 ± 0.6 mL/kg and decreased systemic blood pressure by 27 ± 2 mmHg (1 mmHg = 133.3 Pa) at an isolated carotid sinus pressure of 50 mmHg. These changes were accompanied by a simultaneous decrease in sympathetic efferent nerve activity. When the carotid sinus pressure was increased to 125 and 200 mmHg, these responses were attenuated. It is suggested that left ventricular mechanoreceptors and carotid baroreceptors contribute importantly to the control of venous return and vascular capacitance.

本文言語英語
ページ(範囲)112-118
ページ数7
ジャーナルCanadian journal of physiology and pharmacology
66
2
DOI
出版ステータス出版済み - 1988
外部発表はい

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pharmacology
  • Physiology (medical)

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