Van Lierde M, De Muylder X, Thomas K
Gynecol Obstet Invest. 1979;10(2-3):119-26. doi: 10.1159/000299925.
The authors present a protocol for the interpretation of the fetal heart rate during the second stage of labour (limited to the last 30 min before delivery). The FHR recordings were grouped according to five classes of increasing pathological significance. Good correlations were obtained between these classifications and the Apgar score as well as the umbilical artery pH.
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