ECG and electrophysiological indices in 39 patients with myotonic dystrophy
| Normal ECG | 16 (41) |
| Abnormal ECG | 23 (59) |
| AV block 1° | 7 |
| AV block 1° and LAB | 2 |
| AV block 1° and RBBB | 3 |
| AV block 1° and LBBB | 4 |
| AV block 2° (Mobitz 1) and LAB | 1 |
| LAB | 2 |
| RBBB | 3 |
| LBBB | 1 |
| AH interval (ms): AH > 125 ms | 10 (25.6) |
| RPAVN > 425 ms | 10 (25.6) |
| WK point < 140 beats/min | 7 (18) |
| HV interval (ms): prolonged HV interval | 21 (53.8) |
Values are n (%).
AH, atria to His bundle; AV, atrioventricular; HV, His bundle to ventricle; LAB, left anterior block; LBBB, left bundle branch block; RPAVN, refractoriness period of atrioventricular node; RBBB, right bundle branch block; WK point, Wenckebach point.