Umbilical cord compression indicates which of the following conditions in a pregnant woman?

NORCET 7 Prelims -2024

Obstetrics & Gynaecology

Easy

Appeared in: NORCET 7 Prelims -2024

Explanation

Umbilical cord compression is the most common cause of variable decelerations in the fetal heart rate (FHR).
Variable decelerations are defined as abrupt, visually apparent decreases in the FHR below the baseline. The decrease is 15 beats per minute or more, lasting 15 seconds or more, and takes less than 30 seconds from the onset to the nadir (lowest point).
The compression of the umbilical cord reduces blood flow, which stimulates baroreceptors and chemoreceptors, triggering a vagal nerve response that causes the FHR to drop suddenly.
The shape of the deceleration on the monitor tracing is often sharp and V-shaped, reflecting the abrupt onset and recovery.

Option B: Early decelerations are gradual, uniform decreases in FHR that mirror uterine contractions.
Option C: This option is too general. While a variable deceleration is a type of deceleration, 'Variable deceleration' is the specific and most accurate answer for the pattern caused by cord compression.
Option D: Accelerations are temporary increases in the FHR above the baseline.

Visual 1: Infographic: The VEAL CHOP mnemonic, visually linking each type of fetal heart rate pattern (Variable, Early, Acceleration, Late) to its cause (Cord compression, Head compression, Okay, Placental insufficiency).
Visual 2: Diagram: A sample cardiotocograph (CTG) tracing showing the characteristic V-shape of a variable deceleration, contrasted with the uniform, mirror-image shape of an early deceleration and the delayed, subtle shape of a late deceleration.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of fetal heart rate patterns and their underlying causes during labor as background academic context rather than a clinical decision trigger.
Nurses must be proficient in interpreting fetal heart rate tracings to identify signs of potential fetal distress and intervene promptly to prevent adverse outcomes.
Key nursing interventions for recurrent variable decelerations focus on relieving cord compression and include changing the mother's position (side-lying or knee-chest), administering oxygen, and potentially assisting with an amnioinfusion.
Distinguishing between variable, early, and late decelerations is critical for patient safety, as their causes and the urgency of intervention differ significantly.

How to Approach the Question

First, identify the key phrase in the question stem: 'umbilical cord compression'.
The question asks what this condition indicates, implying a cause-and-effect relationship with one of the FHR patterns in the options.
Recall the common causes for changes in fetal heart rate (FHR) patterns during labor.
Utilize the VEAL CHOP mnemonic, a standard memory aid for this topic: V (Variable) -> C (Cord); E (Early) -> H (Head); A (Acceleration) -> O (Okay); L (Late) -> P (Placental).
Based on the mnemonic, 'Cord compression' directly corresponds to 'Variable deceleration'.
Select the option that matches this association and eliminate the other options based on their known causes (Early deceleration from head compression, Acceleration is normal).

Concept Tested & Keywords

Concept Tested: Interpretation of fetal heart rate patterns and their underlying causes during labor.
Stem keywords: Umbilical cord compression, pregnant woman, fetal heart rate
Lead-in keywords: indicates which of the following
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

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