Identify the CTG graph pattern?& x20; & x20; - NORCET 9 Mains - 2025

NORCET 9 Mains - 2025

Obstetrics & Gynaecology

Medium

Appeared in: NORCET 9 Mains - 2025

Explanation

The pattern shown is a late deceleration, which is a specific type of change in the fetal heart rate (FHR) during labor.
It is defined by a gradual decrease in the FHR where the lowest point (nadir) of the deceleration occurs after the peak of the uterine contraction.
The FHR returns to the baseline only after the contraction has completely ended.
This timing lag is the key feature that distinguishes it from other deceleration patterns.
Late decelerations are clinically significant as they suggest uteroplacental insufficiency, meaning the fetus may not be receiving enough oxygen.

Option A: The term 'Variable acceleration' is incorrect. Accelerations are increases in FHR, not decreases. The image clearly shows decelerations (decreases in FHR). Variable decelerations have an abrupt, jagged appearance (V or W shape) and inconsistent timing with contractions, which is not what is seen in the image.
Option B: In an early deceleration, the nadir of the FHR drop perfectly coincides with the peak of the uterine contraction, creating a 'mirror image' effect. The tracing in the image shows the nadir occurring after the contraction peak.
Option C: While late decelerations are a sign of potential fetal distress, 'fetal distress' is a clinical diagnosis or a state of the fetus, not the specific name of the graph pattern itself. The question asks to identify the pattern shown on the CTG.

Visual 1: Diagram - A comparative chart showing side-by-side examples of Early, Late, and Variable decelerations on a CTG tracing. This helps to visually contrast the timing of the FHR nadir relative to the contraction peak for each type.
Visual 2: Infographic - An infographic titled 'VEAL CHOP' which is a common mnemonic used to remember the causes of different FHR patterns (Variable-Cord compression, Early-Head compression, Acceleration-Okay, Late-Placental insufficiency).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of Cardiotocography (CTG) Patterns as background academic context rather than a clinical decision trigger.
Recognizing late decelerations is a critical nursing skill. It is a non-reassuring pattern that requires prompt intervention to improve fetal oxygenation.
Nursing interventions for late decelerations include changing the mother's position (usually to the left lateral side), administering oxygen via a non-rebreather mask, increasing IV fluids, and discontinuing oxytocin if it is being infused. The primary healthcare provider must be notified immediately.
Patient Safety: Failure to recognize and act on late decelerations can lead to fetal hypoxia, acidosis, and potential long-term neurological injury or even fetal death.

How to Approach the Question

First, identify the two main components of the CTG: the top tracing is the Fetal Heart Rate (FHR) and the bottom tracing is the Uterine Contractions.
Observe the FHR tracing for any periodic decreases (decelerations) that occur in relation to the contractions.
For each deceleration, find its lowest point (the nadir).
Now, find the peak of the corresponding uterine contraction on the bottom tracing.
Compare the timing. Ask yourself: Does the FHR nadir occur before, during, or after the peak of the contraction?
In this image, the nadir of the FHR drop is clearly visible after the peak of the contraction. This time lag is the defining characteristic of a late deceleration.

Concept Tested & Keywords

Concept Tested: Interpretation of Cardiotocography (CTG) Patterns
Stem keywords: CTG graph, pattern, identify
Lead-in keywords: Identify
Clinical cues: The image displays a CTG tracing with both fetal heart rate and uterine contraction data, requiring analysis of their relationship.

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