Which position a pregnant woman must be given for blood pressure monitoring during last trimester?

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Obstetrics & Gynaecology

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

The left lateral position is the recommended standard for blood pressure monitoring in the third trimester.
This position displaces the gravid uterus to the left, away from the inferior vena cava and aorta.
By preventing this aortocaval compression (supine hypotension syndrome), it ensures venous return to the heart is not obstructed.
This allows for an accurate, stable blood pressure reading and maintains adequate blood flow to the placenta and fetus.

Option A: The Trendelenburg position (head lower than feet) is not used for routine blood pressure monitoring. It would increase respiratory difficulty in a late-term pregnant woman due to pressure on the diaphragm.
Option B: Fowler's position (semi-sitting) is not the optimal position. While it is better than supine, it may not fully prevent aortocaval compression, and standardizing the arm at heart level can be less consistent than in a lateral recumbent position.
Option C: The supine position (lying flat on the back) is contraindicated for blood pressure measurement in the last trimester. It directly causes compression of the inferior vena cava by the heavy uterus, leading to supine hypotension syndrome.

Clinical Relevance

Nursing practice connection: Use the key finding related to Maternal positioning for blood pressure monitoring in late pregnancy to guide bedside assessment, documentation, and the next nursing action.
Accurate blood pressure monitoring is critical in pregnancy to screen for hypertensive disorders like pre-eclampsia. An incorrect position can lead to a falsely low reading, masking a serious condition.
Nurses must always instruct pregnant women in the third trimester to avoid lying flat on their backs and to rest in a lateral position to ensure maternal and fetal well-being.
What if? If a patient cannot tolerate the left lateral position, a small pillow or wedge placed under the right hip while she is in a semi-supine position can also be effective. This provides enough of a tilt to displace the uterus off the major vessels.

How to Approach the Question

First, identify the key elements of the question: 'pregnant woman', 'last trimester', and 'blood pressure monitoring'.
Recall the major physiological changes in the third trimester, specifically the size and weight of the gravid uterus.
Consider how patient positioning can affect hemodynamics (blood circulation) due to the large uterus.
Analyze the risk associated with each position. The supine position presents a known risk of 'supine hypotension syndrome' or 'aortocaval compression'.
Evaluate the options based on which one actively prevents this complication. The left lateral position is the standard of care to displace the uterus from the great vessels.
Therefore, select the option that ensures both an accurate reading and patient safety.

Concept Tested & Keywords

Concept Tested: Maternal positioning for blood pressure monitoring in late pregnancy
Stem keywords: pregnant woman, blood pressure monitoring, last trimester, position
Lead-in keywords: Which position
Clinical cues: The phrase 'last trimester' is a key clinical cue, indicating the gravid uterus is large enough to cause hemodynamic changes based on position.

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E6 Nursing Fundamentals Taylor pp. 208-210, 1070-1072