BAROREFLEX CONTROL OF REGIONAL CAPACITANCE AND BLOOD-FLOW DISTRIBUTION WITH OR WITHOUT ALPHA-ADRENERGIC BLOCKADE

被引:44
作者
DESCHAMPS, A
MAGDER, S
机构
[1] ROYAL VICTORIA HOSP, DIV CRIT CARE, CRIT CARE UNIT L305, 687 PINE AVE W, MONTREAL H3A 1A1, QUEBEC, CANADA
[2] MCGILL UNIV, MEAKINS CHRISTIE LABS, MONTREAL H3A 1A1, QUEBEC, CANADA
来源
AMERICAN JOURNAL OF PHYSIOLOGY | 1992年 / 263卷 / 06期
关键词
COMPLIANCE; STRESSED VOLUME; UNSTRESSED VOLUME; TIME CONSTANT; RESISTANCE; PRESSURE-VOLUME CURVE; PHENTOLAMINE; HEXAMETHONIUM; VENOUS RESISTANCE; VENOUS RETURN;
D O I
10.1152/ajpheart.1992.263.6.H1755
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
Regional blood volumes (V(b)), unstressed volumes (V0), blood flow distribution, venous compliances (C(v)), venous resistances (R(v)), and time constants of drainage (tau(v)) were determined in dogs anesthetized with alpha-chloralose at carotid sinus pressures (P(cs)) of 50 and 200 mmHg and dosed with alpha-adrenergic or ganglionic blockade at a P(cs) of 50 mmHg. V(b) was measured in each region from indicator dilution curves and mean transit times. V0 was extrapolated from the pressure-volume curves. P(cs) of 50 and 200 mmHg were maintained in random order. With a decrease in P(cs), arterial pressure increased from 58.7 +/- 4.1 to 104.6 +/- 6.4 mmHg (P < 0.01), peripheral fractional blood flow decreased from 69.8 +/- 3.8 to 55.8 +/- 3.9% (P < 0.001), splanchnic V(b) decreased from 28.3 +/- 1.9 to 19.3 +/- 1.2 ml/kg (P < 0.01), and splanchnic V0 decreased from 19.6 +/- 1.4 to 6.3 +/- 2.1 ml/kg (P < 0.001). Splanchnic R(v) and tau(v) also decreased, whereas splanchnic C(v) increased. Phentolamine at low P(cs) only partially reversed the decrease in splanchnic capacitance, whereas hexamethonium completely abolished it. In conclusion, changes in splanchnic R(v) and blood flow distribution are important components of the carotid sinus reflex, and alpha-adrenergic receptor activation is only partially responsible for the changes in vascular capacitance by the baroreceptor reflex.
引用
收藏
页码:H1755 / H1763
页数:9
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