[Hemodynamic mechanisms of blood flow regulation in the vena cava anterior].
A similarity of the blood flow shifts in response to every single pressor or depressor stimulus in the v. cava anterior in cats and a possibility of dissimilar changes of capacity of the vein's vascular basin under the effect of one and the same stimulus, are revealed. This dissimilarity is mainly due to a skin-muscular component of this vascular basin. An increase in the central venous pressure from 0 to 40 mm of water limits the extent of shifts in the capacity function of the v. cava anterior's basin. The blood flow changes in the v. cava anterior is mainly due to a relationship among regional components of the vessels' total peripheral resistance. A potential possible contribution of the v. cava anterior basin vessels capacitance's shifts constitutes 17.5%, whereas under the effect of neurogenic stimuli in the increase of the blood flow in the v. cava anterior may be completely (up to 100%) maintained by a drop of the capacitance of the vein's vascular basin.
Samoĭlenko
A V
AV
Institute of Experimental Medicine, Russian Acad. Med Sci., St. Petersburg, 197376, Acad. Pavlov St., 12, Russia.
D000818:Animals; D002415:Cats; D002496:Central Venous Pressure; D006439:Hemodynamics; D012039:Regional Blood Flow; D018924:Vascular Capacitance; D014655:Vascular Resistance; D014684:Venae Cavae / Q000502:physiology*