What is the Chiari network?

The Chiari network is indeed a network of fibrous tissue that arises from the eustachian ridge, which is associated with the eustachian valve located in the right atrium of the heart. This structure is often found in the right atrium and can present as thin, web-like strands that may be seen during an echocardiographic examination.

The eustachian valve is a remnant of fetal life that plays a role in directing blood flow from the inferior vena cava towards the foramen ovale during development. However, after birth, while its primary function diminishes, remnants, such as the Chiari network, may persist. Understanding the Chiari network is important for sonographers as it can sometimes be mistaken for a thrombus or other cardiac abnormalities during imaging.

Its presence is generally benign but can have clinical significance in certain contexts, particularly in patients with underlying cardiovascular conditions. The network itself does not control blood flow like a valve or facilitate electrical impulses as seen in the conduction pathways of the heart. This understanding of the network is vital for accurate diagnosis during cardiac imaging.