Final answer:
In a client with premature ventricular contractions (PVCs), the observed sign or symptom is fluttering in the chest or palpitations.
Step-by-step explanation:
In a client with premature ventricular contractions (PVCs), the sign or symptom observed is fluttering in the chest or palpitations. PVCs are abnormal heartbeats that originate in the ventricles of the heart, and they can often be felt as skipped beats or fluttering sensations.