Table 3.
Generalized linear regression analysis of covariates associated with mortality. Analyzed at 30 days and 4 years in patients suspected of myocardial infarction triaged by use of electrocardiogram-based telemedicine (n = 15,578 cases with complete data)
| 30-day mortality | 4-year mortality | |||
|---|---|---|---|---|
| Covariates remaining significant in models | ||||
| Risk difference (95 % CI) | P value | Risk difference (95 % CI) | P value | |
| Demographics | ||||
| Age, per 1-y increase | 0.19 % (0.17 to 0.21) | <0.001 | 0.9 % (0.8 to 1.0)) | <0.001 |
| Comorbidity | ||||
| Charlson Comorbidity Index | ||||
| 0 | 1 [Reference] | 1 [Reference] | ||
| 1–2 | 0.1 % (−0.6 to 0.8) | 0.852 | 7.2 % (5.4 to 8.9) | <0.001 |
| 3–4 | 1.6 % (0.3 to 2.8) | 0.017 | 22 % (19 to 26) | <0.001 |
| ≥5 | 6.4 % (4.3 to 8.6) | <0.001 | 39 % (35 to 44) | <0.001 |
| Clinical characteristics | ||||
| Systolic blood pressure | ||||
| <120 | 1 [Reference] | 1 [Reference] | ||
| 120–139 | −4.9 % (−6.2 to −3.6) | <0.001 | −3.7 % (−6.2 to −1.2) | 0.004 |
| 140–159 | −6.0 % (−7.3 to −4.8) | <0.001 | −7.3 % (−9.9 to −4.8) | <0.001 |
| ≥160 | −7.8 % (−9.1 to −6.5) | <0.001 | −11 % (−13 to −8.0) | <0.001 |
| Heart rate | ||||
| <70 | 1 [Reference] | 1 [Reference] | ||
| 70–84 | 1.3 % (0.5 to 2.1) | 0.001 | 4.1 % (2.0 to 6.3) | <0.001 |
| 85–99 | 2.2 % (1.3 to 3.1) | <0.001 | 5.2 % (2.9 to 7.5) | <0.001 |
| ≥100 | 3.2 % (2.2 to 4.1) | <0.001 | 8.7 % (6.5 to 10.9) | <0.001 |
| Patient category | ||||
| Chest pain, no MI | 1 [Reference] | 1 [Reference] | ||
| Chest pain and MI | 1.8 % (0.8 to 2.8) | <0.001 | 1.7 % (−0.7 to 4.0) | 0.167 |
| Dyspnea, no MI | 7.3 % (5.5 to 9.2) | <0.001 | 16 % (12 to 19) | <0.001 |
| Dyspnea and MI | 12 % (5.7 to 20) | <0.001 | 21 % (11 to 32) | <0.001 |
| Other | 1.7 % (0.8 to 2.6) | <0.001 | 3.8 % (1.7 to 5.8) | <0.001 |
| Cardiac arrest | 26 % (18 to 34) | <0.001 | 20 % (11 to 29) | <0.001 |
Abbreviations: MI myocardial infarction