Table 1

Characteristics of RR-NSVT (n = 681)

CharacteristicMean ± SDMedian (25th, 75th Percentile)Range
Duration of RR-NSVT episodes (number of beats)26.4 ± 9.124 (20, 31)12–51
Duration of RR-NSVT episodes (seconds)7.5 ± 2.67 (6, 10)5–20
Cycle length (ms) of all RR-NSVT episodes (n = 681)259 ± 32260 (240, 280)180–350
Cycle length (ms) of all monomorphic RR-NSVT (n = 300)273 ± 21270 (260, 290)230–350
Cycle length (ms) of all polymorphic RR-NSVT (n = 381)243 ± 31260 (210, 270)180–310

The difference in cycle length between monomorphic and polymorphic episodes was statistically significant (p < 0.0001).

RR-NSVT = rapid-rate nonsustained ventricular tachycardia.