Table 2. CRT implant characteristics.
| Responders (n = 76) |
Non-Responders (n = 49) |
p | |
|---|---|---|---|
| Indications for CRT Therapy*, n (%) | 0.01 | ||
| Class I | 39 (51) | 16 (33) | |
| Class IIa | 35 (46) | 25 (51) | |
| Class IIb | 2 (3) | 8 (16) | |
| QRS morphology prior to CRT implantation, n (%) | |||
| Left bundle branch block | 53 (70) | 22 (45) | 0.01 |
| Right bundle branch block | 0 (0) | 3 (6) | 0.11 |
| Non-specific interventricular conduction delay | 4 (5) | 14 (29) | <0.01 |
| Paced | 5 (7) | 1 (2) | 0.47 |
| Narrow | 0 (0) | 2 (4) | 0.30 |
| Complete heart block | 14 (18) | 7 (14) | 0.72 |
| CRT type, n (%) | 1.00 | ||
| CRT-D | 54 (71) | 34 (69) | |
| CRT-P | 22 (29) | 15 (31) | |
| Lead type, n (%) | 1.00 | ||
| LV lead | 72 (95) | 47 (96) | |
| HIS lead | 4 (5) | 2 (4) | |
| LV lead position, PA chest xray^, n (%) | 0.37 | ||
| Apical | 11 (15) | 10 (21) | |
| Mid | 49 (68) | 33 (70) | |
| Basal | 12 (17) | 4 (9) | |
| LV lead position, lateral chest xray^, n (%) | 0.77 | ||
| Anterolateral | 1 (1) | 0 (0) | |
| Lateral | 16 (22) | 12 (26) | |
| Posterolateral | 52 (72) | 34 (72) | |
| Posterior | 3 (4) | 1 (2) |
* Indications for CRT therapy per ACC/AHA 2012 Device Guidelines
^ Excludes 6 patients who had HIS leads placed