Final answer:
The nurse should suspect uterine rupture if contractions abruptly stop during labor, which is a serious event requiring immediate medical attention.
Step-by-step explanation:
Uterine rupture is a serious complication during labor where the muscular wall of the uterus tears. Nurses and doctors look for various signs that suggest complications during labor, including signs of uterine rupture. In the options provided, choice c. Contractions abruptly stop during labor is a potential indicator of uterine rupture. Generally, if the contractions stop suddenly and are accompanied by pain and bleeding, this might indicate that the uterus has ruptured. However, none of the options should be taken in isolation, as the clinical presentation of uterine rupture can include fetal heart rate abnormalities, pain, and a change in the mother's vital signs.
True labor progresses in a positive feedback loop. Uterine contractions stretch the cervix, causing it to dilate and efface, leading to more powerful uterine contractions. A uterine rupture disrupts this process and can cause a cessation of contractions, posing a risk to both mother and baby, necessitating immediate medical intervention.