Source:http://linkedlifedata.com/resource/umls/id/C0262662
NCI: An electrocardiographic finding of a normal QRS followed by a premature ventricular contraction; a rhythmic pairing of normal and abnormal beats originating in the ventricles in a 1-1 ratio.,NCI: An electrocardiographic finding of a normal QRS followed by a premature ventricular contraction; a rhythmic pairing of normal and abnormal beats originating in the ventricles in a 1-1 ratio. (NCI)