[Circulating blood volume and its respiratory surface under conditions of cranio-cerebral hypothermia].

Experiments were conducted on dogs; a study was made of the effect of cranio-cerebral hypothermia on the circulatory blood volume and its respiratory surface. A reduction of body temperature from 36 to 30 degrees C led to the increase of the circulating blood volume from 62.4 +/-2.18 ml/kg to 65.2 +/- 6.95 ml/kg, of the circulating erythrocytes from 27.3 +/- 1.43 ml/kg to 33.8 +/-3.78 ml/kg. Further cooling reduced these indices to 40.7 +/- 3.12 ml/kg and 24.2 +/- +/-2.14 ml/kg, respectively. Plasma starts to leave the vascular bed simultaneously with the beginning of cooling. Its volume decreases with the fall of temperature from 36 to 24 degrees C from 34 +/- 1.07 ml/kg to 16.6 +/-1.19 ml/kg.