Table III.
Associations between Baseline Characteristics and Receiving an ICD shock or not over 12 months
| Variable N(%) | No shocks (n=117) |
Shock (n=51) |
χ2 | p |
|---|---|---|---|---|
| Age | 6.23 | 0.28 | ||
| < 30 | 4 (100%) | 0 (0 %) | ||
| 30-39 | 0 (0 %) | 0 (0 %) | ||
| 40-49 | 9 (50 %) | 9 (50 %) | ||
| 50-59 | 24 (72.7 %) | 9 (27.3 %) | ||
| 60-69 | 38 (71.7 %) | 15 (28.3 %) | ||
| 70-79 | 33 (33 %) | 12 (26.7 %) | ||
| > 80 | 9 (60 %) | 6 (40 %) | ||
| Gender-male | 88 (68.2 %) | 41 (31.8 %) | 0.53 | 0.47 |
| ICD reason* | ||||
| VF cardiac arrest | 48 (73.8 %) | 17 (26.2 %) | 0.89 | 0.35 |
| Sustained VT with syncope | 13 (81.3 %) | 3 (18.8 %) | 1.13 | 0.29 |
| Unmonitored syncope & VT > 10 sec | 5 (38.5 %) | 8 (61.5 %) | 6.48 | 0.01 |
| VT lasting ≥ 30 seconds | 4 (44.4 %) | 5 (55.6%) | 2.86 | 0.91 |
| VT or VF inducible on EPS | 47 (72.3 %) | 18 (27.7 %) | 0.36 | 0.55 |
| Taking beta blocker medication | 73 (68.9 %) | 33 (31.1 %) | 0.08 | 0.78 |
| Diabetes Mellitus | 31 (72.1 %) | 12 (27.9 %) | 0.16 | 0.69 |
| COPD | 8 (47.1 %) | 9 (52.9 %) | 4.56 | 0.03 |
| Hypertension | 62 (66.7 %) | 31 (33.3 %) | 0.87 | 0.35 |
| Congestive Heart Failure | 47 (60.3 %) | 31 (39.7 %) | 6.07 | 0.01 |
| Carotid artery stenosis | 9 (90 %) | 1 (10 %) | 2.08 | 0.15 |
| Stroke | 16 (59.3 %) | 11 (40.7 %) | 1.64 | 0.20 |
| Liver/Renal disease | 12 (70.6 %) | 5 (29.4 %) | 0.01 | 0.93 |
| Sedentary lifestyle | 45 (65.2 %) | 24 (34.8 %) | 1.09 | 0.30 |
| Current smoker | 26 (68.4 %) | 12 (31.6 %) | 0.04 | 0.85 |
| Myocardial Infarction | 63 (67.7 %) | 30 (32.3 %) | 0.14 | 0.71 |
| Ejection Fraction ≤ 30 % | 49 (66.2%) | 25 (33.8%) | 0.38 | 0.53 |
| BMI ≥ 25 | 77 (66.4%) | 39 (33.6%) | 1.89 | 0.17 |
| Depression ≥ 16 on CES-D | 29 (76.3 %) | 9 (23.7 %) | 1.03 | 0.31 |
| Anxiety ≥ 40 on STAI | 43 (78.2 %) | 12 (21.8 %) | 2.82 | 0.09 |
| Ethnicity | 1.79 | 0.76 | ||
| White | 104 (69.3 %) | 46 (30.7 %) | ||
| American Indian/Alaska | 2 (66.7 %) | 1 (33.3 %) | ||
| Asian/Pacific Islander | 4 (100 %) | 0 (0 %) | ||
| Black/African | 5 (71.4 %) | 2 (28.6 %) | ||
| Other | 2 (66.7 %) | 1 (33.3 %) | ||
| Charlson Comorbidity Score (mean, SD) * | 4.31 (2.29) | 4.31 (2.44) | 0.10 | 0.75 |
| Short Blessed (mean, SD) * | 2.44 (3.02) | 2.39 (2.71) | 0.01 | 0.92 |
*
ICD reason=reason for initial ICD implant.
ICD= implantable cardioverter defibrillator.
COPD=chronic obstructive pulmonary disease.
BMI=body mass index.
STAI=State-Trait Anxiety Inventory
CES-D=Centers for Epidemiologic Studies-Depression Scale
*
F statistic by ANOVA.