CMR-based heart deformation analysis for quantification of hemodynamics and right ventricular dysfunction in patients with CTEPH.

INTRODUCTION

Quantification of hemodynamics and right ventricular (RV) function is crucial for pulmonary hypertension (PH). Cardiovascular magnetic resonance-based heart deformation analysis (CMR-HDA) has been used to assess the ventricular strain.

OBJECTIVE

This study was to determine the correlation of right ventricular longitudinal strain (RVLS) assessed with CMR-HDA with RV function as well as hemodynamics in patients with chronic thromboembolic pulmonary hypertension (CTEPH).

METHODS

Thirty-six CTEPH patients were prospectively included in this research. Each patients underwent CMR and right heart catheterization (RHC). RVLS and RV ejection fraction (RVEF) was quantified from cine images acquired with a retrospectively gated turbo FLASH gradient-echo sequence. The late gadolinium enhancement (LGE) images were acquired using a 2D inversion recovery phase-sensitive fast gradient-echo sequence. Hemodynamics were determined with RHC.

RESULTS

Right ventricular longitudinal strain measured with CMR-HDA was -13.99 ± 4.94%. Bland-Altman plots showed statistical agreement with RVLS with low intra- and interobserver variability. RVLS correlated with serum N-terminal-pro-B-type natriuretic peptide (r = 0.615, P < .001). RVLS inversely correlated with RVEF (r = -0.699, P < .001), and it was positively correlated with both RVESV (r = 0.664, P < .001) and myocardial the volume of LGE (r = 0.447, P = .008). Receiver-operating characteristic (ROC) indicated that RVLS values of >-14.20% could be used to predict RVEF <40% with a 100% sensitivity and a 96.7% specificity. Hemodynamically, RVLS was positively correlated with mean pulmonary artery pressure (r = 0.598, P < .001) and pulmonary vascular resistance (r = 0.685, P < .001).

CONCLUSION

Right ventricular longitudinal strain assessed by CMR-HDA is a readily available and reproducible parameters of RV function. RVLS >-14.20% suggests the presence of RV dysfunction.