Table 2.
ECGI: Right ventricular activation duration (RVAD) during different pacing modes in HF patients
| Pt# | Interval from CRT Implant to ECGI Study (months) | Intrinsic Conduction (RVAD, ms) | RV Pacing | CRT-BiV (RVAD, ms) | CRT-LV (RVAD, ms) | LV Lead Location | |
|---|---|---|---|---|---|---|---|
| Short AV Delay (RVAD, ms) | Optimal AV Delay (RVAD, ms) | ||||||
| 1 | 1.3 | 22 | - | 59 | 61 | 22 | Lateral |
| 2 | 8 | - | 67 | - | 67 | 63 | Anterolateral |
| 3 | 0.7 | 25 | - | 26 | 26 | 24 | Anterolateral |
| 4 | 7 | 25 | 116 | 117 | 107 | 91 | Anterolateral |
| 5 | 12 | 21 | 51 | 55 | 53 | 17 | Lateral |
| 6 | 5 | - | 96 | 98 | 96 | 84 | Lateral |
| 7 | 5 | 33 | 44 | 49 | 47 | Lateral | |
| 8 | 15 | 20 | - | - | 76 | Lateral | |
| 9 | 0.7 | 38 | 57 | 76 | 56 | 39 | Lateral |
| 10 | 6 | 28 | 119 | 133 | 137 | 22 | Lateral |
| 11 | 17 | 15 | 74 | 78 | 76 | 19 | Lateral |
| 12 | 8 | 50 | 110 | 110 | 110 | 45 | Inferolateral |
| 13 | 4 | 45 | 91 | 43 | 41 | 41 | Lateral |
| 14 | 5 | 67 | 87 | 92 | 109 | 80 | Anterolateral |
| Mean | 6.8 | 32 | 83 | 78 | 76 | 46 | |
| SD | 5 | 15 | 26 | 33 | 32 | 27 | |
AVD: atrioventricular delay; CRT: cardiac resynchronization therapy; BiV: simultaneous biventricular pacing mode; LV-left ventricular pacing.
RV free wall activation duration during intrinsic conduction in normals (n=7, not shown) was 28 ±3 ms9