Related Experiment Video
Updated: Apr 23, 2026

Discovering Middle Ear Anatomy by Transcanal Endoscopic Ear Surgery: A Dissection Manual
Published on: January 11, 2018
Large Eustachian valve: an incidental finding yet perplexing
Anju Sarupria1, V Bhuvana, Manju Mani
1Department of Cardiac Anaesthesia, Pushpanjali Crosslay Hospital, Vaishali, Ghaziabad, Uttar Pradesh, India.
Abstract:
Eustachian valve (EV), a remnant of the right valve of sinus venosus in the right atrium can be puzzling. Often it is confused with Chiari network or atrial adhesions and is reported with unusual complications. We report a case of large EV impeding cannulation of inferior vena cava (IVC) during aortic valve replacement. Transesophageal echocardiography diagnosed the presence of large EV and warned of the difficulty with IVC cannulation and helped preparedness for an alternative plan during surgery.
Related Concept Videos
Heart Valves
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Anatomy of the Ear
Aortic Regurgitation I: Introduction
Mitral Valve Prolapse I: Introduction
Aortic Regurgitation II: Clinical Features and Diagnostic Tests
The Auditory Ossicles
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

