Table 1.
Patient characteristics and mode of VT induction
| Patient no. | Age/sex | Ischemic heart disease | Drugs | Ejection fraction (%) | VT cycle length (ms) | Percent DP mapped | Mode of induction (S1) + S2 + S3 (ms) | No. of transitional beats | Discrete transitional beats at pacing site | Transitional reentrant beats |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 60/M | Yes | Am | 35 | 335 | 100 | (400) + 290 | 1 | 1 | 1 |
| 2 | 72/F | Yes | Am+Mex | 30 | 360 | 100 | (300) | 1 | 1 | 0 |
| 285 | 100 | (400) + 260 + 260 | 6 | 1 | 2 | |||||
| 3 | 55/M | Yes | Am | 30 | 380 | 100 | (600) + 260 + 260 | 2 | 0 | 2 |
| 310 | 100 | (550) + 240 + 260 | 2 | 0 | 2 | |||||
| (550) + 240 + 260 | 2 | 0 | 2 | |||||||
| (550) + 240 + 260 | 2 | 0 | 2 | |||||||
| (600) + 260 + 260 | 2 | 0 | 2 | |||||||
| 4 | 69/M | Yes | Am+Mex | 35 | 340 | 100 | (400) + 360 + 360 | 1 | 0 | 1 |
| 5 | 61/M | Yes | Am+Mex | 35 | 430 | 100 | Spontaneous | 1 | 0 | 0 |
| 6 | 63/M | Yes | Am+Bi | 40 | 380 | 40 | 280 + 260 | 1 | 1 | 0 |
| 280 + 280 | 0 | 0 | 0 | |||||||
| 7 | 75/M | Yes | Am | 35 | 480 | 31 | (600) + 300 + 290 | 0 | 0 | 0 |
| 8 | 70/M | Yes | Am+Mex | 30 | 310 | 100 | (500) + 300 + 260 | 4 | 3 | 1 |
| 475 | 100 | (500) + 300 + 280 | 3 | 1 | 2 | |||||
| 9 | 79/F | Yes | Am | 35 | 320 | 100 | (380) | 0 | 0 | 0 |
| (500) | 2 | 1 | 0 | |||||||
| (500) | 4 | 1 | 1 | |||||||
| (400) + 220 + 200 | 3 | 1 | 0 | |||||||
| 37 | 11 | 18 | ||||||||
| 1.9 ± 1.5 | 0.58 ± 0.77 | 0.95 ± 0.91 |
Brackets around numbers indicate drive trains (S1) followed by premature extras S2 and S3. Transitional beats are polymorphic beats on ECG occurring after pacing but before stable monomorphic ventricular tachycardia (VT) is established.
Am = amiodarone; Bi = Bisoprolol; DP = diastolic pathway; Mex = mexiletine.