Cord compression is present in a fetal heart rate tracing. Which type of deceleration is most likely seen?

NORCET 10 Mains

Obstetrics & Gynaecology

Easy

Appeared in: NORCET 10 Mains

Explanation

Variable decelerations are abrupt decreases in the fetal heart rate (FHR) that are variable in shape, duration, and timing relative to uterine contractions.
The primary cause of variable decelerations is umbilical cord compression, which temporarily reduces blood flow and oxygen to the fetus.
On a tracing, they often appear as sharp 'V', 'U', or 'W' shapes, reflecting the rapid drop and recovery of the FHR.
The mnemonic VEAL CHOP is a useful tool where 'V' for Variable corresponds with 'C' for Cord Compression.

Option B: Early decelerations are caused by fetal head compression during contractions, not cord compression. They are benign and mirror the contraction pattern.
Option C: Late decelerations are caused by uteroplacental insufficiency, indicating inadequate oxygen transfer from the placenta to the fetus. This is a non-reassuring pattern and is not directly caused by cord compression.
Option D: A prolonged deceleration is a significant drop in FHR lasting more than 2 minutes but less than 10. While severe cord compression can cause this, 'variable deceleration' is the most common and characteristic pattern for intermittent cord compression.

Visual 1: FHR Tracing - An image showing a typical variable deceleration on a cardiotocograph, highlighting its abrupt onset and 'V' shape in relation to a uterine contraction.
Visual 2: Infographic - A chart illustrating the VEAL CHOP mnemonic, visually linking each FHR pattern (Variable, Early, Acceleration, Late) to its cause (Cord compression, Head compression, Okay, Placental insufficiency).

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 (FHR) patterns and their underlying causes as background academic context rather than a clinical decision trigger.
Recognizing FHR patterns is a critical nursing skill in labor and delivery to assess fetal well-being and intervene promptly.
The first-line nursing intervention for variable decelerations is to change the maternal position to relieve pressure on the umbilical cord. This simple action can often resolve the pattern.
Recurrent or severe variable decelerations, especially with absent variability, can indicate worsening fetal distress and may require escalation of care, including amnioinfusion or preparation for an expedited delivery.

How to Approach the Question

First, identify the key term in the question: 'cord compression'.
Recall the common causes for different types of fetal heart rate decelerations.
Use the VEAL CHOP mnemonic to systematically link the cause to the FHR pattern. 'V' (Variable) corresponds to 'C' (Cord compression).
Evaluate the other options. 'E' (Early) is for 'H' (Head compression), and 'L' (Late) is for 'P' (Placental insufficiency).
Confirm that variable deceleration is the pattern most directly and commonly associated with cord compression.
Select the option for variable deceleration as the correct answer.

Concept Tested & Keywords

Concept Tested: Interpretation of fetal heart rate (FHR) patterns and their underlying causes.
Stem keywords: Cord compression, fetal heart rate tracing, deceleration
Lead-in keywords: most likely
Negative lead-in flag: false

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