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Why It's Important to See a Doctor Premature ventricular contractions (PVCs) are a form of irregular heartbeat. These extra beats aren't usually hazardous, and they could go away by themselves. Doctors will listen to your heartbeat, and check other vital signs. They might order a Holter Monitor that records the electrical impulses generated by your heart over a span of between 24 and 48 hours. They might also order blood tests to determine your thyroid and electrolyte levels. hormones. Diagnosis PVCs are caused by elec