Which of the following maternal cardiovascular findings is expected during labor?
1. Increased cardiac output
2. Decreased pulse rate
3. Decreased white blood cell count
4. Decreased blood pressure
1
1. Correct. During each contraction, 400 ml of blood is emptied from the uterus into the maternal vascular system. This increases cardiac output by about 10% to 15% in the first stage of labor and by about 30% to 50% in the second stage.
2. Incorrect. The heart rate will increase slightly during labor.
3. Incorrect. The WBC count can increase during labor.
4. Incorrect. During the first stage of labor, uterine contractions cause systolic readings to increase by about 10 mm Hg. During the second stage of labor, contractions may cause sys-tolic pressures to increase by 30 mm Hg and diastolic readings to increase by 25 mm Hg.
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