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Why It's Important to See a Doctor Premature ventricular contractures (PVCs), are a kind of irregular heartbeat. These extra beats are typically not dangerous and can go away by themselves. To diagnose PVC, doctors will listen to your heartbeat and look for other vital signs. They may order a Holter Monitor that records the electrical impulses of your heart over a time of 24 to 48 hours. They may also request blood tests to determine the levels of electrolytes and thyroid hormones. Diagnosis PVCs occur when electrical