NCIt definition : An electrocardiographic finding of a rapid grossly irregular ventricular rhythm with
marked variability in QRS cycle length, morphology, and amplitude. The rate is typically
greater than 300 bpm. (CDISC);
Alternative definition : CDISC: An electrocardiographic finding of a rapid grossly irregular ventricular rhythm
with marked variability in QRS cycle length, morphology, and amplitude. The rate is
typically greater than 300 bpm.;