Breech Presentation and Delivery - Incidence
The incidence of Breech presentation in all pregnancies is about 3-4%. The percentage of breech deliveries decreases with advancing gestational age from 25% of births prior to 28 weeks' gestation to 7% of births at 32 weeks' gestation to 1-3% of births at term.
Fetal abnormalities are observed in 17% of pre-term breech deliveries and in 9% of term breech deliveries. Cord prolapse occurs in 7.5% of all breeches. This incidence varies with the type of breech: 0-2% with frank breech, 5-10% with complete breech, and 10-25% with footling breech. Cord prolapse occurs twice as often in women who have had previous pregnancy (or multiparas) (6%) than in the first time pregnancy ( or primigravidas ) (3%).
Nuchal arms, in which one or both arms are wrapped around the back of the neck, are present in 0-5% of vaginal breech deliveries and in 9% of breech extractions. Fetal head entrapment may result from an incompletely dilated cervix and head that lacks time to mould to the maternal pelvis. This occurs in 0-8.5% of vaginal breech deliveries.
Breech Presentation and Delivery - References:
- Breech Presentation - (http://www.emedicine.com/med/topic3272.htm)
- Breech birth - (http://en.wikipedia.org/wiki/Breech_birth)
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