The effect of aortic area measurement site on the energy loss coefficient: a comparison between echocardiography and cardiac computed tomography angiography in patients with aortic stenosis

Abstract

Aim:The energy loss coefficient (ELCo) has been suggested as a more accurate indicator of aortic stenosis (AS) severity as compared to transthoracic echocardiography (TTE) aortic valve area (AVA). There are little data regarding the optimal location for aortic area (Aa) measurement needed for ELCo calculation and the agreement of ELCo with direct anatomical AVA measurement. The aim of this study was to determine the optimal site of Aa measurement for calculation of the ELCo, using cardiac computed tomography angiography (CCTA) AVA planimetry as the reference standard. Methods:We analyzed 69 patients with AS who underwent both CCTA and TTE.ELCo and CCTA planimetry AVA were compared using multiple sites for CCTA Aa measurement (sinus, sinotubular junction, or ascending aorta). Conclusions: ELCo using Aa measurement at the sinotubular junction showed the best agreement with CCTA AVA. We therefore recommend using the sinotubular junction Aa for ELCo calculation. Results K E Y W O R D Saortic stenosis, cardiac computed tomography angiography, energy loss coefficient, energy loss index, transthoracic echocardiography

Non-invasive determination of pressure recovery by cardiac MRI and echocardiography in patients with severe aortic stenosis: short and long-term outcome prediction

“…8 The STJ was chosen, as it is considered to be the best measurement location for PR. 14 The LVOT diameter was measured in mid-systole, inner edge to inner edge, and accounting for the fact that the LVOT has an elliptical shape in almost 90% of patients. 15,16 For CMR, the LV mass and volumes (plus index for body surface area) were determined using ARGUS software (Siemens Healthineers).…”

“…8 The STJ was chosen, as it is considered to be the best measurement location for PR. 14 The LVOT diameter was measured in mid-systole, inner edge to inner edge, and accounting for the fact that the LVOT has an elliptical shape in almost 90% of patients. 15,16…”