What changes does a toco detect during monitoring?

A tocodynamometer, commonly referred to as a toco, is a device used in electronic fetal monitoring to detect and record uterine contractions during labor. The primary function of a toco is to measure the changes in uterine tension, which corresponds to the contractions of the uterus. This change in tension helps healthcare providers assess the frequency, duration, and intensity of contractions, which are important indicators of labor progress and the fetal environment.

Option B accurately reflects the toco’s ability to detect changes in uterine shape due to tension, which is essential for monitoring labor. By providing real-time data about uterine activities, the toco enables clinicians to make informed decisions about the management of labor and delivery.