Cardiac output returns to nonpregnant values by how long postpartum?

Cardiac output returns to nonpregnant values by how long postpartum?

• A. 12 hours
• B. 1 day
• C. 2 weeks
• D. 1 month

Answer: (C)

Cardiac output is higher in pregnancy to meet the increased blood volume and metabolic needs. After delivery, the placental circulation ends and plasma volume begins to fall quickly as diuresis proceeds, venous return diminishes, and systemic vascular resistance rises. These changes cause the heart to stop working as hard, so CO declines rapidly and generally returns to pre-pregnant values by about two weeks postpartum. The earliest postpartum period (within hours to a day) still often shows elevated CO, while waiting until a full month is beyond the typical normalization point for most individuals, though some variation can occur.

Cardiac output is higher in pregnancy to meet the increased blood volume and metabolic needs. After delivery, the placental circulation ends and plasma volume begins to fall quickly as diuresis proceeds, venous return diminishes, and systemic vascular resistance rises. These changes cause the heart to stop working as hard, so CO declines rapidly and generally returns to pre-pregnant values by about two weeks postpartum. The earliest postpartum period (within hours to a day) still often shows elevated CO, while waiting until a full month is beyond the typical normalization point for most individuals, though some variation can occur.