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NCI: An electrocardiographic finding of normal QRS followed by a premature ventricular contraction; a rhythmic pairing of normal and abnormal beats originating from the ventricles in a 1-2 ratio.,NCI: An electrocardiographic finding of normal QRS followed by a premature ventricular contraction; a rhythmic pairing of normal and abnormal beats originating from the ventricles in a 1-2 ratio. (NCI)
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