Gnosis- Fetal Heart Rate Monitoring
Define Baseline variability - ANS-- Measured from peak to trough and excludes
decelerations and accelerations
Define Absent Variability - ANS--Amplitude range undetectable
What is the amplitude range in minimal Variability - ANS-- Amplitude range ≤ 5 bpm
What is the amplitude range in moderate Variability - ANS-- 6-15 bpm
What is the amplitude range in marked variability - ANS-- > 25 bpm
What is the amplitude and duration of accelerations in a fetus ≥ 32 weeks - ANS-- ≥ 15
bpm above baseline, with a duration ≥ 15 seconds ( 15 x15 rule)
What is the amplitude and duration of accelerations in fetus < 32 weeks - ANS-- ≥ 10
bpm above baseline, with a duration ≥ 10 sec
What are the characteristics of a prolonged acceleration - ANS-- lasts ≥ 2 min and < 10
min
-defined as baseline change if ≥ 10 min.
What are the characteristics of a variable deceleration - ANS-- Abrupt decrease in FHR;
drop ≥ 15 bpm, last ≥ 15 sec and < 2 minutes in duration
- Mostly result from cord compression
What are the characteristics of late decelerations - ANS-- Symmetrical and gradual
decrease and return of FHR; onset to nadir ≥ 30 sec; associated with contraction
- Usually due to uteroplacental insufficiency
What are the characteristics of Early Decelerations - ANS-- Deceleration that begin with
contractions
- Nadir occurs at the same time as the peak of the contraction
- Result from fetal head compression
What is the characteristic of a Sinusoidal FHR pattern - ANS-- Smooth, sine wave-like
undulating pattern with a cycle frequency of 3-5 / min that persist for ≥ 20 min.
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