Final answer:
The exact percentage of prolonged decelerations occurring during uterine rupture is not provided in the reference information. Prolonged decelerations are a sign of fetal distress often associated with uterine rupture, which is a serious and emergent condition requiring immediate medical attention.
Step-by-step explanation:
The question related to uterine rupture and prolonged decelerations in fetal heart rate is specifically addressing a complication that can occur during childbirth. In the context of uterine rupture, prolonged decelerations are a significant sign, indicating distress to the fetus due to the abrupt loss of uterine integrity and the compromised blood flow to the fetus. It is critical to note that the provided information does not directly quote the percentage of cases where prolonged decelerations occur during a uterine rupture. As such, we cannot give an exact percentage without additional context or peer-reviewed medical data. However, for educational purposes, prolonged decelerations can be an indication of significant clinical events such as uterine rupture, which requires immediate medical attention to prevent serious outcomes for both the mother and the fetus.
Concerning the amniotic membranes, they can rupture before the onset of labor and often do so at the end of the dilation stage because of excessive pressure from the fetal head. The condition of preterm premature rupture of membranes (PPROM) is where the amniotic sac leaks fluid before 38 weeks of gestation and can pose significant risks to both the mother and the fetus.