Table 2.
Electrophysiological data from 17 patients with Mahaim-type accessory pathways who underwent electrophysiological study.
| Parameter | Right-sided | Left-sided | P-value | X 2 |
|---|---|---|---|---|
| EPS | ||||
| QRS duration | 132 (111–159) | 150 (133–169) | 0.17 | |
| Basic cycle length, ms | 691 (540–813) | 717 (613–825) | 0.43 | |
| M potential | 53.9% (7/13) | 0% (0/4) | 0.06 | 3.662 |
| SVT cycle length, ms | 325 (242–379) | 332 (299–369) | 0.97 | |
| Combined other tachycardia | ||||
| AVRT or concealed AP | 15.4% (2/13) | 25% (1/4) | 0.66 | 0.195 |
| AVNRT | 30.7% (4/13) | 25% (1/4) | 0.78 | 0.17 |
| AT | 7.7% (1/13) | 0 | 0.56 | 0.327 |
| Ebstein's disease | 0 | 0 | ||
| Procedure | ||||
| Procedure duration, min | 111 (89–221) | 82 (62–133) | 0.17 | |
| RF duration, min | 11 (2–38) | 3 (2–3) | 0.03 | |
| Recurrence | 7.7% (1/13) | 0% (0) | 0.56 | 0.327 |
AP, accessory pathway; AT, atrial tachycardia; AVRT, atrioventricular reentrant tachycardia; AVNRT, atrioventricular nodal reentrant tachycardia; EPS, electrophysiological study; SVT, supraventricular tachycardia; RF, radiofrequency.