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Why It's Important to See a Doctor Premature ventricular contractures (PVCs), are a form of irregular heartbeat. These extra beats are usually not dangerous, and they can disappear by themselves. Doctors will listen to your heartbeat, and check other vital indicators. They might recommend an Holter monitor, a device that records your heart's electrical impulses over 24-48 hours. They can also order blood tests to check your electrolyte levels and thyroid hormones. Diagnosis PVCs are caused by electrical impulses that