10 Monitoring FHR and FMP Using Ultrasound
108
Half-Counting
Baseline Rate 120
Baseline Variability Moderate
Accelerations Present
Decelerations Not apparent
Contractions Minimal
Artifact Half-counting, noise, drop out
Comment Reassuring tracing. The half-count at 4-5 minutes
into the tracing may simulate a fetal deceleration,
but the abruptness and the lack of any
compensatory changes when the normal rate
returns suggests that this is half-counting.
Insertion of the maternal heart rate (see below)
may produce a similar pattern. Note also very
brief episodes of half-counting, maternal
insertion, and signal drop out.
Remediation Auscultation or the application of a direct scalp
electrode, if feasible, will reveal the true fetal heart
rate.
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