[Resistance, capacitance and exchange functions of the vessels of the small intestine in acute hypothermia].

Shifts of vascular functions occurred in two phases in cats cooled from 37 degrees C to 25 degrees C: first, a considerable increase of the integral vascular pre- and postcapillary resistance as well as of the capillary hydrostatic pressure with obvious reduction of the capillary filtration coefficient (CFC) and stretching ability of the venous bed occurred at 31-29 degrees C in the organ under study; the second phase (25 degrees C) involved a decrease of the integral vascular pre- and postcapillary resistance, a considerable augmentation of venous vessels stretching ability and stabilizing of the CFC at the level reached at 31 degrees C. Experiments with decentralized intestine revealed no virtual differences of the vascular function shifts in hypothermia whereas the values of integral resistance of the intestine's vascular bed, precapillary resistance, capillary pressure and of the venous vessels stretching ability were considerably decreased.