Source:http://linkedlifedata.com/resource/umls/id/C0232119
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)