Cardiovascular system changes occur during pregnancy. Which of the following findings would be considered normal for a woman in her second trimester?
1. Heart sounds (S1, S2) less audible
2. Increase in pulse rate
3. Increase in blood pressure
4. Decrease in red blood cell production
2
1. Incorrect. There is a more audible splitting of S1 and S2.
2. Correct. Between 14 and 20 weeks of gestation, the pulse increases about 10 to 15 beats/minute, which then persists to term.
3. Incorrect. In the first trimester, blood pressure usually remains the same as the prepreg-nancy level, but then gradually decreases up to about 20 weeks of gestation. During the second trimester, both systolic and diastolic pressures decrease by about 5 to 10 mm Hg.
4. Incorrect. During pregnancy, there is an accelerated production of RBCs.
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