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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 are usually not risky, and they may disappear on their own. Doctors will listen to your heartbeat and also check other vitals signs. They might order a Holter monitor which records your heart's electrical impulses over a period of 24 to 48 hours. They might also order blood tests to assess your electrolyte levels and thyroid hormones. Diagnosis PVCs are caused by electrical impulses which mis