[The effect of hemodilution on capillary blood flow and arteriovenous shunt after resuscitation in dogs].
The present study was designed to elucidate the adverse effects of temporary circulatory arrest upon the capillary blood flow and arteriovenous shunt and additionally to observe how hemodilution may improve such microcirculatory deterioration. The organ capillary blood flow and organ fraction of cardiac output were measured by the microsphere (phi 9 microns) trapping method in 14 organs. Simultaneously, the arteriovenous shunt rate was measured by continuous collection of drained venous blood at 4.8 ml.min-1 for two minutes from the brain, kidney, liver, splanchnic organs, skeletal muscle of the pelvic limb and all systemic circulatory organs. In five non-hemodiluted dogs (C group), the capillary blood flows decreased in the thyroid gland and pancreas at 30 minutes after circulatory arrest, and in these organs as well as in the brain and stomach at 90 minutes after the arrest. Change in the fraction of cardiac output was similar to that in the capillary blood flow. The arteriovenous shunt rate was unchanged after circulatory arrest. The remaining ten dogs were hemodiluted with dextran-70 solution either before (Pre group, five dogs) or after (Post group, five dogs) circulatory arrest. Both groups of hemodilution maintained the capillary blood flow and showed no alteration of the arteriovenous shunt rate after circulatory arrest, except for an increase in the systemic arteriovenous shunt rate in the Pre group. These results suggest that hemodilution maintains the capillary blood flow at a normal level and ameliorates the oxygen supply into organs after circulatory arrest.
Yano
H
H
Yoshida
H
H
Fukui
A
A
Kimura
K
K
Endo
E
E
Takaori
M
M
D000818:Animals; D001163:Arteriovenous Anastomosis; D002196:Capillaries / Q000502:physiology*; D004285:Dogs; D006438:Hemodilution; D008833:Microcirculation; D012151:Resuscitation