Table 3.
Patient characteristics (analysis populationa).
| Demographics | Results (n = 146) |
|---|---|
|
Age at enrolment, years Mean ± SD Minimum, median, maximum |
58.6 ± 14.3 20, 60, 85 |
| Gender | |
| Male | 117 (80.1%) |
| Female | 29 (19.9%) |
| Pacing dependency | 2 (1.4%) |
| Indication for ICD | 142 (97.3%) |
| Primary prevention indication | 96 (65.8%) |
| Secondary prevention indication | 46 (31.5%) |
| Planned for CRT | 30 (20.5%) |
| Cardiovascular history | |
| Coronary artery disease | 73 (50.0%) |
| Cardiomyopathy | 119 (81.5%) |
| Hypertension | 83 (56.8%) |
| Valvular disease | 15 (10.3%) |
| Comorbidities | |
| Diabetes mellitus | 29 (19.9%) |
| Renal insufficiency | 14 (9.6%) |
| Chronic pulmonary disease | 13 (8.9%) |
| Drugs affecting pacing threshold | |
| Class I antiarrhythmics | 1 (0.7%) |
| Class II antiarrhythmics | 120 (82.2%) |
| Class III antiarrhythmics | 18 (2.3%) |
| Class IV antiarrhythmics | 2 (1.4%) |
aOf 194 patients enrolled, 146 underwent the study-specific MRI (analysis population) and 48 did not undergo MRI because of pre-procedure exclusion criteria (n = 29), consent withdrawal (n = 14), or other reasons (n = 5, see text).
CRT: cardiac resynchronisation therapy; ICD: implantable cardioverter-defibrillator; MRI: magnetic resonance imaging; SD: standard deviation.