Final answer:
At 39 weeks, ruptured membranes typically indicate the onset of labour, and this is known as spontaneous rupture of membranes (SROM). If this happens before labour at term, it is referred to as premature rupture of membranes (PROM). Medical monitoring is essential after the rupture to prevent infection and ensure complete expulsion of the placenta and membranes.
Step-by-step explanation:
At 39 weeks, ruptured membranes could lead to the onset of labour. When the amniotic sac, known as the forewaters, ruptures, this event is referred to as a woman's 'water breaking'. Typically, labour begins within a day following this event. This is called the 'spontaneous rupture of membranes' (SROM) if it happens during labour at term. However, if rupture occurs before labour at term, it is known as 'premature rupture of membranes' (PROM).
Once the membranes rupture, there is an increased risk for infection for both the mother and the fetus. Hence, medical attention and monitoring are crucial to ensure the safety of both. Preterm premature rupture of membranes (PPROM) is a related condition that occurs before 38 weeks of gestation, which can sometimes lead to labour within 48 hours of membrane rupture.
It is essential that the obstetrician ensures the placenta and associated fetal membranes are fully expelled after birth to prevent complications such as postpartum hemorrhage.