End-Systolic Eccentricity Index Obtained by Enhanced Computed Tomography Is a Predictor of Pulmonary Vascular Resistance in Patients with Chronic Thromboembolic Pulmonary Hypertension.

The usefulness of the parameters of biventricular function simultaneously measured using enhanced multi-detector computed tomography (MDCT) pulmonary angiography in patients with chronic thromboembolic pulmonary hypertension (CTEPH) has not been clarified. This study aimed to verify the correlation between left and right ventricular (RV) parameters and pulmonary vascular resistance (PVR). Patients who underwent enhanced MDCT before diagnostic right heart catheterization at Nagoya University Hospital between October 2014 and April 2021 were enrolled. The correlation of biventricular function and volume parameters with PVR was assessed. Eighty patients were retrospectively analyzed. Patients' mean age was 65 ± 13 years, mean PVR was 9.1 (range, 6.1-11.3) Wood units, and mean end-systolic eccentricity index (esEI) was 1.76 ± 0.50. RV end-systolic volume (ESV) ( p = 0.007), RV cardiac output (CO) ( p < 0.001), RV ejection fraction ( p < 0.001), LV end-diastolic volume (EDV) ( p < 0.001), left ventricular (LV) ESV ( p = 0.006), LVCO ( p < 0.001), end-diastolic EI ( p < 0.001), and esEI ( p < 0.001) were significantly correlated with PVR. The LVEDV ( p = 0.001) and esEI ( p < 0.009) were independent predictors of PVR. Systolic pulmonary arterial pressure (PAP) ( p < 0.001), diastolic PAP ( p < 0.001), mean PAP ( p < 0.001), right atrial pressure ( p < 0.023), and PVR ( p < 0.001) were significantly higher in the high esEI group than in the low esEI group. The esEI was a simple predictor of CTEPH severity.