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1.Blood volume: immediately after birth averages about 300ml. (75mL additional blood from umbilical cord â if itâs still attached) But the fluid is lost into the neonateâs tissue spaces again - 300mL maintained. 2.Cardiac Output: in average 500ml/min.
Physiological changes. in pregnancy. Candice K Silversides, Jack M Colman. Physiological changes during pregnancy facilitate the adaptation of the cardio-. vascular system to the increased metabolic needs of the mother, thus enabling. adequate delivery of oxygenated blood to peripheral tissues and the fetus. Changes occur in circulating blood volume (affecting preload), peripheral vas-.