NCIt definition : An electrocardiographic finding of three or more consecutive complexes of ventricular
origin with a rate less than a certain threshold (100 or 120 beats per minute are
commonly used). The QRS complexes are wide and have an abnormal morphology. (CDISC);
Alternative definition : CDISC: An electrocardiographic finding of three or more consecutive complexes of ventricular
origin with a rate less than a certain threshold (100 or 120 beats per minute are
commonly used). The QRS complexes are wide and have an abnormal morphology.; FDA: An electrocardiographic finding of three or more consecutive complexes of ventricular
origin. The QRS complexes are wide and have an abnormal morphology. (CDISC);