Table 4.

QRS ≥ 120 ms (f-wQRS).

name	definition	criteria
f-BBB	various RSR’ patterns with or without Q-wave with greater than two R waves (R’) or greater than two notches in the R wave or greater than two notches in downstroke or upstroke of S wave	Nmax > 2 or at least three notches in the positive half plane or at least three notches in the negative half plane
fragmented premature ventricular complex	greater than two R waves (R’) or greater than two notches in the downstroke or the upstroke of S wave or only two notches in the R with greater than 40 ms separation	Nmax > 2 or at least three notches in the negative half plane or two notches in the positive half plane with > 40 ms delay
fragmented paced rhythms	greater than two R waves (R’) or greater than two notches in the downstroke or the upstroke of S wave	Nmax > 2 or at least three notches in the negative half plane