RMVT (n = 15) | ARVD (n = 9) | p value | |
---|---|---|---|
General data | |||
Age (years) | 35 (11) | 35 (15) | NS |
Sex (M/F) | 15/0 | 8/1 | NS |
Ejection fraction (%) | 61 (8) | 71 (14) | NS |
Routine ECG data | |||
Heart rate (beats/min) | 68 (15) | 65 (16) | NS |
QRS–I (ms) | 78 (13) | 78 (8) | NS |
QRS–V1 (ms) | 90 (9) | 93 (14) | NS |
QRS–V6 (ms) | 86 (11) | 84 (14) | NS |
QT measurements | |||
QT–V4 (ms) | 407 (28) | 456 (108) | NS |
QTc–V4 (ms) | 429 (29) | 446 (34) | NS |
QTd (ms) | 58 (24) | 44 (21) | NS |
QTd′ (ms) | 38 (19) | 35 (12) | NS |
aQTd (ms) | 17 (7) | 14 (6) | NS |
Signal averaged ECG (40 Hz) | |||
QRS (ms) | 89 (8) | 96 (18) | NS |
HFQRS (ms) | 100 (15) | 118 (21) | NS |
LAS (ms) | 28 (11) | 48 (14) | < 0.01 |
RMS (μV) | 52 (44) | 13 (12) | < 0.05 |
Morphometric analysis | |||
Myocytes (%) | 74.0 (3.4) | 65.2 (11.5) | < 0.05 |
Fibrous tissue (%) | 3.0 (1.7) | 6.4 (4.4) | NS |
Fatty tissue (%) | 0.3 (1.1) | 3.4 (8.2) | NS |
Interstitium (%) | 22.5 (3.8) | 23.2 (6.1) | NS |
Values are means (SD).
aQTd, adjusted Qt dispersion; ARVD, arrhythmogenic right ventricular dysplasia; HFQRS, duration of filtered QRS signal; ID–V4, V6, intrinsic deflection in leads V1, V6 during ventricular tachycardia; LAS, low amplitude signal duration; QRS–I, V1, V6, QRS duration in lead I, V1, V6; QT, QT interval; QTc, QT correction with square root; QTd, QT dispersion; QTd′, corrected QTd; QTmean, mean QT from 12 leads; RMS, root mean square value of the last 40 ms; RMVT, repetitive monomorphic ventricular tachycardia.