Cardiac SNS Abnormality in Patients with History of Ventricular Tachyarrhythmia
| SNS activity | |||
|---|---|---|---|
| Variable | Abnormal (H/M ratio < 2.8) (n = 40) | Normal (H/M ratio ≥ 2.8) (n = 46) | P |
| Age (y) | 48 ± 19 | 44 ± 20 | NS |
| Female | 10 (25%) | 20 (43.5%) | NS |
| VF | 8 (20%) | 5 (10.9%) | NS |
| Sustained VT | 19 (47.5%) | 22 (47.8%) | NS |
| Nonsustained VT | 13 (32.5%) | 19 (41.3%) | NS |
| Chief complaint | |||
| Arrest or syncope | 18 (45%) | 10 (21.7%) | 0.022 |
| Palpitation | 15 (37.5%) | 22 (47.8%) | NS |
| No symptom | 4 (10%) | 8 (17.4%) | NS |
| History of diabetes | 4 (10%) | 4 (8.7%) | NS |
| History of hypertension | 10 (25%) | 8 (17.4%) | NS |
| History of hyperlipidemia | 3 (7.5%) | 4 (8.7%) | NS |
| Structural heart disease | 14 (35%) | 9 (19.6%) | NS |
| Ischemic heart disease | 2 (5%) | 5 (10.9%) | NS |
| Dilated cardiomyopathy | 8 (20%) | 3 (6.5%) | NS |
| Hypertrophic cardiomyopathy | 4 (10%) | 0 | 0.028 |
| Arrhythmogenic right ventricular dysplasia | 0 | 1 (2.2%) | NS |
| Genetic arrhythmogenic disorder | 2 (5%) | 7 (15.2%) | NS |
| Congestive heart failure | 5 (12.5%) | 2 (4.3%) | NS |
| Positive signal-averaged electrocardiography | 11 (27.5%) | 9 (19.6%) | NS |
| LVEF (%) | 54.5 ± 12.4 | 61.8 ± 9.4 | 0.003 |
| Cardiothoracic ratio (%) | 46 ± 6.4 | 45.5 ± 5.5 | NS |
NS = Not significant.
Positive signal-averaged electrocardiography was defined by guideline of American Heart Association/American College of Cardiology. Cardiothoracic ratio was measured by chest radiography.