Comprehensive and Detailed Explanation From Exact Extract–Based NCC C-EFM References:
The tracing demonstrates:
Baseline ~150 bpm
Variability ≥ 25 bpm amplitude, highly erratic and wide
No sustained decelerations
No sustained accelerations ≥ 2 min
NICHD/NCC definition of marked variability:
Amplitude of baseline FHR fluctuations greater than 25 bpm.
Marked variability often reflects transient fetal autonomic instability due to:
Fetal stimulation
Mild hypoxemia
Maternal anxiety
Drugs (e.g., butorphanol)
Why other answers are incorrect:
B. Multiple prolonged accelerations — No accelerations of ≥2 minutes are present.
C. Tachycardia with variables — Baseline is NOT tachycardic (>160 bpm), and decelerations are not present.
Thus, the correct interpretation is A. Marked variability.
[References:NICHD FHR Definitions; NCC C-EFM Candidate Guide; AWHONN; Menihan; Simpson & Creehan., ]
