Table 3.
Hazard Ratio of Elevated Heart Rate vs Normal Heart Rate for Time to Death or Transplant Within 5 Years of Diagnosis
Outcome |
Model 1 (N=557) |
Model 2 (N=557) |
Model 3 (N=556) |
Model 4 (N=451) |
Model 5 (N=436) |
Model 6 (N=451/451/451) |
---|---|---|---|---|---|---|
Death | 2.29 (1.44–3.64) <0.001 | 2.33 (1.46–3.71) <0.001 | 2.07 (1.29–3.34) 0.002 | 2.35 (1.38–4.02) 0.002 | 2.37 (1.33–4.22) 0.004 | 2.57 (1.50–4.40) 0.001 |
Transplant | 1.65 (1.17–2.32) 0.004 | 1.53 (1.08–2.16) 0.016 | 1.21 (0.85–1.74) 0.286 | 1.30 (0.87–1.94) 0.201 | 1.18 (0.78–1.77) 0.436 | 1.30 (0.87–1.94) 0.201 |
Death or transplant | 1.85 (1.41–2.44) <0.001 | 1.77 (1.34–2.33) <0.001 | 1.47 (1.11–1.96) 0.008 | 1.60 (1.16–2.20) 0.004 | 1.49 (1.07–2.08) 0.018 | 1.60 (1.15–2.21) 0.005 |
Data presented are hazard ratios (95% CIs) and P values. Covariates were included based on statistical (bivariate association with heart rate group P<0.05) or clinical significance. Model 1 is univariate Cox regression model with heart rate (HR) variable (elevated HR vs normal HR) only. Model 2 adjusts for age at diagnosis. Model 3 further adjusts for congestive heart failure (Yes/No) in addition to covariates in Model 2. Model 4 further adjusts for left ventricular fractional shortening (LVFS) z score in addition to covariates included in Model 3. Model 5 further adjusts for medication (including anticongestive therapy, antiarrhythmic, angiotensin‐converting enzyme [ACE] inhibitor, and beta blocker) in addition to covariates included in Model 4. Model 6 is based on backwards model selection; all covariates deemed statistically or clinically significant were included in the initial model. The final model for death outcome adjusts for LVFS z score and ACE inhibitor use; the final model for heart transplant outcome adjusts for LVFS z score, age at diagnosis, and congestive heart failure; the final model for death or heart transplant outcomes adjusts for LVFS z score, age at diagnosis, congestive heart failure, and ACE inhibitor use.