Final answer:
Prolonged decelerations are abrupt decreases of at least 15 bpm from baseline that last longer than 2 minutes but less than 10 minutes. They are considered to be fatal and may require emergency interventions such as vacuum, forceps, or a Caesarian section.
Step-by-step explanation:
The decelerations described in the question are known as prolonged decelerations. These decelerations are abrupt decreases of at least 15 bpm from baseline that last longer than 2 minutes but less than 10 minutes. They are considered to be fatal and may require emergency interventions such as vacuum, forceps, or a Caesarian section.