Table 2.
Univariate Cox Regression Analyses of Functional, Hemodynamic, and Imaging Parameters
| Parameter | Hazard Ratio | 95% CI | P Value |
|---|---|---|---|
| Functional | |||
| Age, y | 1.02 | 1.00-1.04 | .099 |
| Sex, female vs male | 0.41 | 0.22-0.76 | < .001 |
| 6-min walk distance (per 10 m) | 0.96 | 0.94-0.99 | .002 |
| NT-proBNP, pg/mL | 1.20 | 1.04-1.39 | .012 |
| New York Heart Association (class I vs class II) | 1.52 | 0.45-5.11 | .500 |
| New York Heart Association (class I vs class III) | 5.38 | 1.55-18.74 | .008 |
| Hemodynamic | |||
| RHC: Mean pulmonary artery pressure, mm Hg | 1.02 | 1.00-1.04 | .017 |
| RHC: Stroke volume index, mL/m2 | 0.96 | 0.94-0.99 | .003 |
| RHC: Right atrial pressure, mm Hg | 1.10 | 1.04-1.17 | .002 |
| RHC: Cardiac index, mL/m2 | 0.66 | 0.47-0.94 | .020 |
| RHC: Pulmonary vascular resistance index, dyn × s/cm5 | 1.69 | 1.10-2.60 | .017 |
| RHC: Mixed venous oxygen saturation, % | 0.94 | 0.90-0.97 | < .001 |
| RHC: Heart rate, beats/min | 1.02 | 0.99-1.04 | .174 |
| Imaging | |||
| CMR: Stroke volume index, mL/m2 | 0.95 | 0.92-0.99 | .008 |
| CMR: RV ejection fraction, % | 0.96 | 0.94-0.98 | < .001 |
| CMR: RV end-systolic volume index, mL/m2 | 1.02 | 1.01-1.03 | < .001 |
| CMR: RV end-diastolic volume index, mL/m2 | 1.02 | 1.00-1.03 | .017 |
For sex, male patients are used as reference. CMR = cardiac MRI; NT-proBNP = N-terminal pro-brain natriuretic peptide; RHC = right heart catheterization.