12.07.2015 Views

NORMAL LABOUR

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(II) Mechanical factors:(1) Uterine distension theory:Like any hollow organ in the body, when the uterus indistended to a certain limit, it starts to contract to evacuateits contents. This explains the preterm labour in case ofmultiple pregnancy and polyhydramnios.(2) Stretch of the lower uterine segment:by the presenting part near term.

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