Key result
Fetal heart rate short term variation differed significantly between internal and external signal acquisition during labor (correlation between internal STV and delta-STV R=0.70, p<0.01).
Why the study?
Does the method of signal acquisition (internal vs external) or monitor brand affect the calculation of fetal heart rate short term variation (STV)?
Population
120 pregnant women at Karolinska University Hospital, Sweden.
Comparison
Fetal heart rate short term variation monitoring… vs Comparison between internal vs external signal…
Design
Cohort, STV values were concealed for staff involved in the clinical…
Authors
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STV values from internal and external acquisition should not be interchanged in labor; leaves open whether monitor brand further affects clinical thresholds.
Observational (n=120)
No
Does the method of signal acquisition (internal vs external) or monitor brand affect the calculation of fetal heart rate short term variation (STV)?
Effect estimate: R=0.70
p-value: p=<0.01
Fetal heart rate short term variation (STV) differs significantly between internal and external signal acquisition, indicating that intrapartum STV monitoring requires reference values specific to the acquisition method.
Wretler et al. (2016) conducted an observational in Fetal monitoring during labor and antenatal period (n=120). Internal (scalp electrode) fetal heart rate monitoring vs. External (Doppler) fetal heart rate monitoring was evaluated on Correlation between STV from internal monitoring and delta-STV (internal minus external) (R=0.70, p=<0.01). Fetal heart rate short term variation differed significantly between internal and external signal acquisition during labor (correlation between internal STV and delta-STV R=0.70, p<0.01).
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