Validation of instantaneous pressure gradients measured by continuous-wave Doppler in experimentally induced aortic stenosis

Discrepancies between Doppler and catheter gradients in aortic prosthetic valves in vitro. A manifestation of localized gradients and pressure recovery.

“…Therefore, energy loss across the central orifice is reduced and pressure recovery increased, causing a steep decay of the pressure gradient ( Figure 4A). In the present study, the observed decrease of pressure gradient between 5 …”

Discrepancies in Left Ventricular Mass Calculation Based on Echocardiography and Cardiovascular Magnetic Resonance Measurements in Patients with Left Ventricular Hypertrophy

“…However, those studies were limited in sample size and provided only simple correlations between these two modalities. [7][8][9][10] In addition, the previous studies did not examine the reasons why the calculation of LVMI using TTE measurements tends to overestimate LV mass. Especially given that LVMI is a critical prognostic factor in patients with AS undergoing surgical correction, 11 whether the current status of calculating LVMI using echocardiographic measurements matches that of other modalities requires more validation.…”

Avaliação da área valvar aórtica combinando ecocardiografia e ressonância magnética

“…Therefore, replacing the SV in the CE by MRI derived SV measurement may be more accurate in situations where significant flow acceleration is present in the LVOT. On the other hand, Doppler-derived gradients correlate well with invasively measured pressure gradients as it has been demonstrated in the experimental and in the clinical setting 11,12 . Therefore, combining measurements of SV by MRI with measurements of VTI across the aortic valve by echocardiography in hybrid approach 2 takes advantages of both methods.…”