Which statement regarding cardiovascular changes in pregnant women is true?

During pregnancy, cardiovascular changes are significant due to the physiological adaptations required to support the developing fetus. One of the prominent changes is an increase in heart rate, which typically increases by 10 to 15 beats per minute. This increase in heart rate is critical as it helps accommodate the higher blood volume and metabolic demands of both the mother and the fetus.

The body naturally responds to the increased need for oxygen and nutrients, and a higher heart rate is essential for maintaining adequate circulation. As the pregnancy progresses, the total blood volume expands significantly, requiring the heart to pump more efficiently and effectively.

In contrast to this, blood pressure does not typically increase during the first trimester; rather, it may remain stable or slightly decrease due to hormonal changes. Plasma content actually increases during pregnancy, helping to accommodate the increased blood volume. Finally, cardiac output does not decrease; in fact, it increases to ensure that sufficient blood reaches both the maternal organs and the fetus. These physiological adjustments emphasize the body's ability to adapt during pregnancy, highlighting the importance of understanding such changes for emergency medical care and routine healthcare for pregnant women.