Immediately after birth, cardiac output increases by what percentage compared with prepregnancy levels?

Immediately after birth, cardiac output increases by what percentage compared with prepregnancy levels?

• A. 60 to 80 percent higher than prepregnancy levels
• B. 10 to 20 percent higher than prepregnancy levels
• C. Remains unchanged from prepregnancy levels
• D. Decreases by 10 percent from prepregnancy levels

Answer: (A)

Immediately after birth, the heart experiences a surge in output because placental circulation ends and blood from the uterus is rapidly pushed back into the central circulation (autotransfusion). This increases venous return to the heart, raising stroke volume, and, with heart rate typically still elevated, cardiac output climbs substantially. The magnitude of this immediate postpartum increase is about 60 to 80 percent above prepregnancy levels. This hyperdynamic state helps explain why cardiac output is markedly higher right after delivery and then gradually returns toward baseline over the next day or two as fluid balance and vascular resistance normalize.

Immediately after birth, the heart experiences a surge in output because placental circulation ends and blood from the uterus is rapidly pushed back into the central circulation (autotransfusion). This increases venous return to the heart, raising stroke volume, and, with heart rate typically still elevated, cardiac output climbs substantially. The magnitude of this immediate postpartum increase is about 60 to 80 percent above prepregnancy levels. This hyperdynamic state helps explain why cardiac output is markedly higher right after delivery and then gradually returns toward baseline over the next day or two as fluid balance and vascular resistance normalize.