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Changes in central venous pressure were recorded continuously before, during and for 40 to 50 minutes after hemorrhage and transfusion in the amounts of 6.5 cc. per Kg. and 8.1 cc. per Kg. The pressures obtained 15 to 20 minutes after onset of blood volume changes were independent of the rate of hemorrhage or transfusion. In the average subject of 70 Kg., ΔP/ΔV for zero time was 0.7 cm. of water pressure change per 100 cc. volume change. Recovery from hemorrhage was imperceptible during the one hour observation period, but recovery from transfusion was slightly faster.

Changes in Central Venous Pressure after Moderate Hemorrhage and Transfusion in Man