Echocardiographic and clinical parameters before and after 6 months of CPAP treatment.

2D RV-Sl, two dimensional right ventricular longitudinal strain; AHI, apnea hypopnea index; CPAP, continuous positive airway pressure; e/e′, early/early′; ESS, Epworth sleepiness scale; IVSd, diastolic interventricular septum thickness; LVEF, left ventricular ejection fraction; LV/RV MPI, left ventricular/right ventricular myocardial performance index; MV e′/a, mitral velocity early′/atrial; ns, not statistically significant; SD, standard deviation; sPAP, systolic pulmonary artery pressure; SV, stroke volume; TAPSE, tricuspid annular plane systolic excursion; TDI TKS, tricuspid annular systolic tissue Doppler velocity.