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Why It's Important to See a Doctor Premature ventricular contractions (PVCs) are a type of irregular heartbeat. These extra beats usually aren't hazardous, and they could disappear by themselves. Doctors will listen to your heartbeat, and check other vital signs. They might order a Holter monitor which records the electrical impulses your heart produces over the course of 24 hours. They can also order blood tests to determine the levels of electrolytes and thyroid hormones. Diagnosis PVCs are caused by electrical impulses t