Which electrocardiogram change is commonly observed during pregnancy?

During pregnancy, it is common to observe a slight left axis deviation on an electrocardiogram. This occurs due to the physiological changes that take place in a woman's body, such as increased blood volume and changes in hemodynamics as the uterus expands. Additionally, the position of the heart may shift slightly due to the displacement of the diaphragm, contributing to the observable axis deviation.

The other changes listed typically do not present in the same manner during pregnancy. For example, an increased heart rate can occur but is not unique to pregnancy and might also indicate various other conditions. A prolonged QT interval is generally concerning and may signal potential cardiac issues rather than a normal physiological change during pregnancy. Inverted T waves often indicate underlying conditions or heart strain and are not a typical finding in healthy pregnant women. The subtle left axis deviation is a normal adaptation to pregnancy and serves as a reflection of the body’s adjustment to accommodate for the growing fetus.