Key result
Between 20 and 29 weeks gestation, medium-term fetal heart rate variation and the number of accelerations increased significantly (r=0.48, p<0.01 and r=0.34, p<0.01, respectively).
Population
77 women with uncomplicated pregnancies between 20 and 29 weeks gestation
Design
Cross-sectional
Follow-up
1 hour
Authors
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FHR monitoring may require gestational age-specific norms from 20-29 weeks; leaves open prospective validation against perinatal outcomes.
Observational (n=77)
Effect estimate: r = 0.48
p-value: p=<0.01
Fetal heart rate variation differs considerably between the second and third trimesters, with significant increases in variation and accelerations from 20 to 29 weeks gestation.
Ribbert et al. (1991) conducted an observational in Uncomplicated pregnancies (n=77). Gestational age (20 to 29 weeks) was evaluated on Medium term fetal heart rate (FHR) variation (r = 0.48, p=<0.01). Between 20 and 29 weeks gestation, medium-term fetal heart rate variation and the number of accelerations increased significantly (r=0.48, p<0.01 and r=0.34, p<0.01, respectively).