Correlation of Intrapartum Changes in Fetal Heart Rate with Fetal Blood Oxygen and Acid-Base State

Early decelerations of the fetal heart rate from occlusion of the umbilical cord

“…The alternative explanation for them is cord compression. Several authors [l, 4,5,8,11,12,13,15,19,22] have postulated that uterine contractions may slow down the fetal heart rate by three different pathways: a) producing a generalized fetal hypoxia by interfering with the maternal circulation to the placenta; b) increasing fetal intracranial pressure; c) compressing the umbilical cord. Mechanisms b) and c) are summarized in Fig.…”

Réanimation intra-utérine

“…En résumé, l'administration d'oxygène à la mère lors d'une souffrance foetale est recommandée par la plupart des auteurs (16,37,76). En effet, l'aug mentation même peu marquée de la P02 foetale obtenue par cette mesure simple et en elle-même exempte de danger, peut aider à combattre l'hypoxie pendant le temps nécessaire à la neutralisation du facteur causal.…”

Technical characteristics of current cardiotocographic monitors

“…In the late 1950s and early 1960s, Hon in the United States [1], Caldeyro-Barcia in Uruguay [2] and Hammacher in Germany [3] independently developed different parts of the equipment and basic principles necessary for the continuous monitoring of foetal heart rate (FHR) and maternal uterine contraction (UC) signals, in a technique that became known as cardiotocography (CTG). The first commercial monitor was commercialised in 1967 [4], and in high-resource countries, the technology rapidly gained a prominent place in routine obstetric practice.…”