Anatomical and Clinical Significance of the Eustachian Valve and Chiari Network
Clinical Significance and Diagnostic Considerations
- The presence of an extensive Eustachian valve and Chiari network can preclude percutaneous device closure of atrial septal defects, as these structures may interfere with device deployment and proper rim characterization, according to the European Society of Cardiology 1
- Patient characteristics associated with ischemic stroke in patent foramen ovale include the presence of both Eustachian valve and Chiari network, along with larger-sized PFO, right atrial pressure overload with right-to-left shunting, and atrial septal aneurysms, as reported by the American College of Chest Physicians 2
- Transesophageal echocardiography is the diagnostic technique of choice for demonstrating the relationship between the Eustachian valve, Chiari network, and any associated atrial septal pathology, as recommended by the European Society of Cardiology 1
Clinical Significance of the Eustachian Valve
Anatomic Location and Relevance to Electrophysiology
- The Eustachian valve and ridge serve as an important anatomic landmark in cardiac electrophysiology, forming the posterior boundary of the cavotricuspid isthmus used in atrial flutter ablation procedures, with the cavotricuspid isthmus bounded anteriorly by the tricuspid valve annulus and posteriorly by the Eustachian valve and ridge, as noted by the American Heart Association 3, 4, 5