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Why It's Important to See a Doctor Premature ventricular contractures (PVCs) are a kind of irregular heartbeats. These extra beats are typically not harmful and will disappear on their own. Doctors will listen to your heartbeat and look for other vitals indicators. They may order an Holter Monitor that records the electrical impulses generated by your heart over a period of 24 to 48 hours. They can also order blood tests to assess the levels of electrolytes and thyroid hormones. Diagnosis PVCs happen when electrical impul