Table 1 Baseline demographic characteristics of study population
Number of patients, N | 372 |
|---|---|
Age at ICD implant, years, mean (SD) | 61 (13) |
Gender, n (%) | Â |
 Male | 294 (79%) |
Cardiovascular disease risk factors, n (%) | Â |
 Hypertension | 194 (52%) |
 Dyslipidemia | 180 (49%) |
 Diabetes | 106 (29%) |
 Smoking History |  |
  Unknown | 17 (5%) |
  Never | 194 (52%) |
  Previous | 121 (33%) |
  Current | 40 (11%) |
 Angina | 51 (14%) |
 Myocardial infarction | 156 (42%) |
 Heart failure | 151 (41%) |
 Cardiac arrest | 21 (6%) |
 Percutaneous coronary intervention | 73 (20%) |
 Coronary artery bypass graft surgery | 64 (17%) |
Ischemic heart disease | 221 (59%) |
 Stroke | 28 (8%) |
 Chronic kidney disease | 25 (7%) |
Cardiovascular medications, n (%) | Â |
 Aspirin | 203 (55%) |
 Adenosine diphosphate receptor inhibitors | 54 (15%) |
 Anticoagulation | 106 (29%) |
 Diuretic | 165 (44%) |
 Beta blocker | 298 (80%) |
 Calcium channel blocker | 20 (5%) |
 Angiotensin-converting-enzyme inhibitors | 237 (64%) |
 Angiotensin receptor blocker | 45 (12%) |
 Statin | 242 (65%) |
 Nitroglycerin | 12 (3%) |
 Antiarrhythmic drugs | 62 (17%) |
Indication | Â |
 Primary prevention | 238 (64%) |
 Secondary prevention | 134 (36%) |
Type of ICD device | Â |
 Single-chamber ICD | 188 (50.7%) |
 Dual-chamber ICD | 109 (29.4%) |
 Cardiac resynchronization therapy defibrillator | 74 (19.9%) |
ECG findings | Â |
 QRS duration, ms, mean (SD) | 122 (31) |
Intraventricular conduction abnormalities | Â |
 Left bundle-branch block | 87 (29.4%) |
 Right bundle-branch block | 26 (7.1%) |
 Non-specific intraventricular conduction delay | 61 (16.6%) |
Presence of late gadolinium enhancement (LGE) | 266 (71.5%) |
Ischemic LGE | 179 (51%) |