[PF] Electronic fetal monitoring definitions Flashcards
The mean FHR rounded to increments of 5 bpm during a 10-min segment excluding:
- Periodic or episodic changes
- Periods of marked FHR variability
- Segments of baseline that differ by more than 25 bpm
Baseline
Fluctuations in the baseline FHR that are irregular in amplitude and frequency
Baseline variability
A visually apparent abrupt increase (onset to peak in less than 30 seconds) in the FHR
Acceleration
The nadir of the deceleration occurs at the same time as the peak of contraction.
Early deceleration
The deceleration is delayed in timing, with the nadir of the deceleration occurring after the peak of the contraction.
Late deceleration
Visually apparent abrupt decrease in FHR
Variable deceleration
Visually apparent decrease in the FHR below the baseline
Prolonged deceleration
Visually apparent, smooth, sine wave-line undulating pattern in FHR baseline with a cycle frequency of 3-5 per minute which persists for 20 minutes or more
Sinusoidal pattern
The baseline must be for a minimum of 2 min in any 10-min segment or the baseline for that time period is indeterminate. In this case, one may refer to the prior 10-min window for determination of baseline.
Baseline
Variability is visually quantified as the amplitude of peak-to-trough in beats per minute.
Baseline variability
Amplitude range undetectable
Absent
Amplitude range detectable but 5 beats per minutes or fever
Minimal
amplitude range 6-25 beats per minute
Moderate (normal)
amplitude range greater than 25 beats per minute
Marked
At 32 weeks of gestation and beyond, it has a peak of 15 bpm or more above baseline, with a duration of 15 sec or more but less than 2 minutes from onset to return.
Acceleration
In most cases the onset, nadir and recovery of the deceleration are coincident with the beginning, peak and ending of the contraction respectively.
Early deceleration
In most cases the onset, nadir and recovery of the deceleration occur after the beginning, peak and ending of the contraction respectively.
Late deceleration
An abrupt FHR decrease is defined as from the onset of the deceleration to the beginning of the FHR nadir of less than 30 seconds.
Variable deceleration
Decrease in FHR from the baseline that is 15 beats per minute or more, and less than 2 minutes in duration.
Prolonged deceleration
Normal FHR baseline
110-160 bppm
FHR baseline is greater than 160 bpm
Tachycardia
FHR baselines is less than 110 bpm
Bradycardia
Before 32 weeks, it has a peak of 10 bpm or more above baseline with a duration of 10 seconds or more but less than 2 minutes from onset to return.
Acceleration
The decrease in FHR is calculated from the onset to the nadir of the deceleration.
Variable deceleration
Lasts 2 minutes or more but less than 10 minutes in duration
Prolonged acceleration
If an acceleration lasts 10 minutes or longer, it is a __________
Baseline change
The decrease in FHR is 15 beats per minute or greater, lasting 15 seconds or greater and less than 2 minutes in duration.
Variable deceleration
When associated with uterine contraction, their onset, depth and duration commonly vary with successive uterine contraction.
Variable deceleration
