Final answer:
A premature beat that occurs early in the cycle and is preceded by an inverted P wave with a short PR interval is called a premature ventricular contraction (PVC).
Step-by-step explanation:
A premature beat that occurs early in the cycle and is preceded by an inverted P wave with a short PR interval is called a premature ventricular contraction (PVC). PVCs are abnormal heartbeats that originate in the ventricles, causing a premature contraction. They can be caused by various factors such as stress, caffeine, or heart disease.