Obstetric Emergencies by Diogo Ayres-de-Campos

Author:Diogo Ayres-de-Campos
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Moulding of the fetal head to the birth canal is frequent during the course of labour in cephalic presentations, but there is little time for this to occur in breeches. In preterm fetuses head-to-pelvis ratios are higher, and this may allow the fetal pelvis to pass through an incompletely dilated cervix, while the head is later retained.

The risk factors for retention of the after-coming head are displayed in Table 4.1 and are mainly related to fetal head dimensions, flexion of the fetal neck and dimensions of the maternal pelvis. An extended fetal neck predisposes to retention because it increases the anteroposterior diameter of the head.Table 4.1Risk factors for retention of the after-coming head

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