Which cardiac change is not typically associated with a woman in her third trimester of pregnancy?

During the third trimester of pregnancy, various physiological changes occur in a woman's cardiovascular system as a response to the increased blood volume and cardiac output. These adaptations help meet the needs of both the mother and the developing fetus.

A diastolic murmur is not typically associated with normal physiological changes of pregnancy. While some benign heart sounds, such as a systolic ejection murmur, may be common due to increased blood flow across the heart valves, a diastolic murmur usually suggests an underlying pathology, such as valve insufficiency or other cardiovascular issues. It is not a standard finding during a healthy pregnancy.

In contrast, a systolic ejection murmur can be common in pregnancy due to the elevated blood volume and flow across the valves. The heart's position may shift as the uterus expands, leading to a displaced apical impulse. Additionally, the sounds of S1 and S2 may become louder due to increased blood flow, which is also a normal finding. These physiological changes underscore the heart's adaptations to accommodate the unique demands placed on the cardiovascular system during pregnancy. Therefore, identifying that a diastolic murmur is not typically associated with healthy third-trimester pregnancies reflects understanding of normal physiological responses during this period.