During normal pregnancy, the blood pressure is?

Appeared in: IGNOU Post B. SC. Nursing entrance-2019

Explanation

During a normal pregnancy, blood pressure slightly decreases, reaching its lowest point (nadir) in the second trimester.
This is caused by hormonal changes, particularly increased progesterone, which leads to vasodilation and a reduction in systemic vascular resistance.
The diastolic pressure typically falls more than the systolic pressure, by about 5-10 mmHg.
In the third trimester, blood pressure gradually returns to the woman's pre-pregnancy baseline.

Option A: An increase in blood pressure during pregnancy is not normal and suggests a hypertensive disorder like gestational hypertension or pre-eclampsia.
Option B: This is incorrect because a characteristic U-shaped curve, with a dip in the second trimester, is the expected pattern for blood pressure during pregnancy.
Option D: A marked increase in blood pressure is a sign of a serious pathological condition, such as severe pre-eclampsia, and requires urgent medical intervention.

Clinical Relevance

Nursing practice connection: Knowing Physiological changes in blood pressure during normal pregnancy helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Regular blood pressure monitoring is a critical component of antenatal care to screen for hypertensive disorders like pre-eclampsia.
A blood pressure reading of 140/90 mmHg or higher on two separate occasions at least 4 hours apart is diagnostic for hypertension in pregnancy.
Nurses must educate patients about the signs and symptoms of pre-eclampsia, such as severe headaches, visual disturbances, and upper abdominal pain, and instruct them to report these immediately.

How to Approach the Question

Identify the core concept of the question: physiological changes in blood pressure during a 'normal' pregnancy.
Recall the hormonal effects on the cardiovascular system during pregnancy. Progesterone is a key hormone that causes vasodilation.
Think about how vasodilation affects blood pressure. Wider blood vessels lead to lower resistance and therefore lower pressure.
Consider the timeline of these changes. The effect is most pronounced in the middle of pregnancy.
Evaluate the options based on this physiological understanding. 'Slightly decreased' aligns with the known mid-pregnancy dip.
Eliminate the other options: 'Increased' and 'Markedly increased' are pathological, and 'Not changed' ignores the well-documented physiological dip.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 48-69

E6 Physiology Guyton 4SAE Part 3 p. 62-64

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