# A client at 39 weeks is in active labor after spontaneous rupture of membranes. Click the fetal heart-rate segment whose shape and timing are most consistent with intermittent umbilical cord compression.

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> language: en  
> subject: Reduction of Risk Potential  
> category: ROR

## Question

A client at 39 weeks is in active labor after spontaneous rupture of membranes. Click the fetal heart-rate segment whose shape and timing are most consistent with intermittent umbilical cord compression.

![](https://mymerci.kr/data/nclex/hotspot/regen_20260908_2350/HSR527.svg)

## Explanation

B contains an abrupt decrease whose onset-to-nadir is 12 seconds, consistent with a variable deceleration.

## In-depth explanation

Quick answer
B. B contains an abrupt decrease whose onset-to-nadir is 12 seconds, consistent with a variable deceleration.
Why this is the best choice
The nadir drops 45 beats/min, and the decrease lasts 46 seconds. Its abrupt onset distinguishes it from the gradual decreases. Cord compression is associated with variable decelerations; the whole tracing and clinical condition still guide management.
Clinical picture
The observations are fictional teaching data. Apply the stated context; the selected feature does not by itself replace a complete bedside assessment.
Memory hook
Compare onset-to-nadir speed and timing against the contraction.
Decision rule
Compare onset-to-nadir speed and timing against the contraction.
Why the other regions do not fit
A falls gradually and reaches its nadir with the contraction peak. C falls gradually with a nadir after the contraction peak, a different mechanism requiring its own assessment. D is an increase, not a deceleration.
**Sources**
- FHR decelerations are classified by onset-to-nadir speed and their relationship to contractions.

## Key concepts

- **Fetal pattern and contraction timing** — Compare onset-to-nadir speed and timing against the contraction.
- **Comparison with context** — C is also concerning, but its gradual delayed timing does not support the mechanism asked about.

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