Transesophageal echocardiographic assessment of pulmonary artery to ascending aorta ratio for the detection of pulmonary hypertension in cardiac surgical patients

Objective The objective of the study was to investigate if the ratio of main pulmonary artery (mPA) and ascending aorta (AscAo), (mPA:AscAo) could serve as a screening tool in identifying PAH. Design A prospective observational study. Setting Tertiary care centre, university hospital. Participants 54 adult patients undergoing off-pump coronary artery bypass grafting (OPCAB) surgery. Interventions Main pulmonary artery (mPA) and ascending aorta (AscAo) transverse diameters were measured by transesophageal echocardiography (TEE) and simultaneously the mean pulmonary arterial pressures (mPAP) were recorded using pulmonary artery catheter. Measurements and Main Results mPA:AscAo ratio demonstrated significant linear correlation with mPAP measured by pulmonary artery catheterization( i.e r=0.61, C.I= 0.5352 to 0.6736, P