Related Experiment Video
Updated: Jul 13, 2026

An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices
Published on: August 25, 2023
Interrogation of the aortic valve
Andrew D Friedrich1, Prem S Shekar
1Department of Anesthesiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA. andrew.friedrich@uc.edu
Objective:
To review the essential elements of the transesophageal echocardiographic examination of the aortic valve, with emphasis on the technique for performing a two-dimensional examination, the quantification of aortic stenosis and regurgitation, and the effect of this modality on cardiac surgical decision making.
Design:
Literature review.
Discussion:
Transesophageal echocardiographic examination of the aortic valve can provide detailed information on aortic valve structure and function, provided proper technique is utilized. This review presents the current recommendations from the American Society of Echocardiography for the performance of a two-dimensional examination of the aortic valve and for the quantification of aortic stenosis or aortic regurgitation by application of Doppler techniques. To demonstrate the applicability of transesophageal echocardiography in clinical practice, the effect of transesophageal echocardiography on the cardiac surgical management of patients with aortic valvular disease is described.
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Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.

