During pregnancy, which cardiovascular change is expected in the second trimester?

During the second trimester of pregnancy, it is expected that blood pressure decreases. This occurs primarily due to the physiological changes in the cardiovascular system as a woman's body adapts to the growing fetus. As the uterus expands, there is an increased volume of blood circulating, which can lead to a reduction in peripheral vascular resistance. Additionally, the secretion of hormones, such as progesterone, causes relaxation of the smooth muscle in blood vessels, contributing to lower blood pressure levels.

It's important to recognize that while blood pressure may dip during the second trimester, it typically stabilizes and may rise again in the third trimester as blood volume increases even more, and the body adjusts to support both the mother and the developing fetus. This understanding is crucial for monitoring maternal health throughout pregnancy.