In a pregnant woman during the 2nd trimester, which cardiovascular finding is considered normal physiological change?

Appeared in: NORCET 10 Mains

Explanation

During the second trimester of pregnancy, arterial blood pressure normally decreases, reaching its lowest point (nadir) around 24 to 26 weeks of gestation.
This drop in blood pressure is primarily caused by a decrease in systemic vascular resistance.
The reduced resistance is a result of vasodilation (widening of blood vessels) mediated by hormones like progesterone and prostaglandins.
Despite a significant increase in cardiac output and blood volume, the vasodilation effect is more pronounced during the second trimester, leading to lower blood pressure readings.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiological cardiovascular changes during pregnancy as background academic context rather than a clinical decision trigger.
Nurses must be able to differentiate normal physiological changes from pathological signs. Knowing that a dip in BP is expected in the second trimester prevents unnecessary alarm and intervention.
Accurate BP measurement and documentation at every prenatal visit are crucial for establishing a baseline and tracking trends. A rise from the second-trimester nadir back to or above baseline in the third trimester can be an early indicator of preeclampsia.
Patient education is key. Nurses should inform pregnant women about these expected changes and the importance of reporting symptoms like severe headaches, visual disturbances, or sudden swelling, which could signal hypertension.

How to Approach the Question

First, identify the core of the question: It asks for a 'normal physiological' cardiovascular change during the '2nd trimester'.
Recall the major cardiovascular adaptations during pregnancy. Key parameters to consider are blood pressure, heart rate, cardiac output, and blood volume.
Think about the timeline of these changes. How does each parameter behave in the first, second, and third trimesters?
Evaluate each option against your knowledge: Does heart rate decrease? No, it increases. Does urine output decrease? No, it tends to increase. Does blood pressure increase? No, that's pathological. Does blood pressure decrease? Yes, it typically reaches its lowest point in the second trimester.
Select the option that correctly describes the physiological norm for the specified time frame.

Concept Tested & Keywords

Concept Tested: Physiological cardiovascular changes during pregnancy.
Stem keywords: pregnant woman, 2nd trimester, cardiovascular finding, normal physiological change
Lead-in keywords: which
Clinical cues: 2nd trimester

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E6 Obstetrics Williams p. 48-68

E6 Physiology Essentials Sembulingam 10e Part 2 p. 141-143

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Attempt every question from this paper in a timed mock, then review the full solution for each one.