Patients | ECG 1 | HV 1 ms | Indication 2nd electrophysiological study | Time interval between EP in months | ECG 2 | SA-ECG2 | HV 2 ms | Pacemaker |
1 | Normal | 45 | Follow-up | 75 | Normal | Negative | 50 | No |
2 | Normal | 55 | Follow-up | 136 | Normal | Negative | 55 | No |
3 | Normal | 35 | CP and palpitations | 48 | Normal | Negative | 50 | No |
4 | LAB | 50 | Follow-up | 58 | LAB | Positive | 60 | No |
5 | AVB 1 + RBBB | 58 | Presyncope | 48 | AVB 1 + RBBB | Negative | 65 | No |
6 | AVB 1 | 60 | ECG modification | 24 | AVB 1 | Negative | 80 | Yes |
7 | Normal | 50 | ECG modification | 108 | LAB | Positive | 70 | Yes |
8 | Normal | 40 | Follow-up | 118 | Normal | Positive | 45 | No |
9 | Normal | 55 | Follow-up | 78 | Normal | Negative | 60 | No |
10 | Normal | 55 | Follow-up | 132 | Normal | Negative | 55 | No |
11 | Normal | 30 | Syncope | 50 | Normal | Negative | 50 | No |
12 | Normal | 50 | Follow-up | 144 | Normal | Negative | 60 | No |
13 | Normal | 50 | ECG modification | 132 | LBBB | † | 90 | Yes |
14 | LAB | 55 | Follow-up | 132 | LAB | Negative | 50 | No |
15 | Normal | 60 | Follow-up | 96 | Normal | Negative | 60 | No |
16 | LAB + RBBB | 60 | ECG modification | 96 | AVB 1 + LAB + RBBB | Positive | 80 | Yes |
17 | AVB 1 | 50 | Follow-up | 72 | AVB 1 | – | 50 | No |
18 | LAB | 50 | Follow-up | 96 | LAB | Negative | 60 | No |
19 | LAB | 55 | Follow-up | 142 | LAB | Negative | 65 | No |
20 | Normal | 50 | Bradytachycardia | 72 | Normal | Negative | 55 | Yes* |
21 | Normal | 60 | SA-ECG + | 43 | Normal | Negative | 60 | No |
22 | Normal | 50 | Follow-up | 120 | Normal | Negative | 65 | No |
23 | Normal | 60 | Syncope, SA-ECG + | 90 | Normal | Positive | 60 | No |
24 | Normal | 60 | SA-ECG + | 40 | Normal | Positive | 80 | Yes |
25 | Normal | 60 | Follow-up | 120 | Normal | Negative | 60 | No |
Signal-averaged (SA)-ECG was regarded as the presence of QRSD of 100 ms or greater and LAS40 of 36 ms or greater.15
↵* Pacemaker implanted for brady-tachycardia syndrome.
↵† Invalid because of noise.
AVB 1, atrioventricular block 1; CP, chest pain; EP, electrophysiological testing; HV, His-ventricle; LAB, left anterior block; LBBBG, left bundle branch block, RBBB, right bundle branch block.