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Why It's Important to See a Doctor Premature ventricular contractions (PVCs) are a kind of irregular heartbeat. These extra beats are usually not dangerous, and they can disappear by themselves. To diagnose PVC doctors listen to your heartbeat and look for other vital signs. They may order a Holter Monitor which captures the electrical impulses of your heart over a span of 24 to 48 hours. They can also request blood tests to check your thyroid hormones and electrolyte levels. Diagnosis PVCs are caused by electrical impulse