What is a Chiari network?
Introduction. The Chiari network, encountered infrequently in the right atrium, is a fenestrated, net-like embryonic remnants of valves of sinus venosus, lying closely in relation to the inferior vena cava and coronary sinus, sometimes connecting these with other right atrial structures [1].
What is the difference between Chiari network and Eustachian valve?
the Chiari network will originate from either the Eustachian or Thebesian valve and attach to the upper wall of the RA or the IAS, the Eustachian valve does not, and should not be termed a Chiari network, even if it is mobile and fenestrated. The Chiari network is often considered clin- ically insignificant.
Is Chiari network congenital?
Background: Chiari’s network is a congenital remnant of the right valve of the sinus venosus. It has been found in 1.3% to 4% of autopsy studies and is believed to be of little clinical consequence.
What is Crista terminalis?
The crista terminalis (or terminal ridge) is a ridge of myocardium within the right atrium that extends along the posterolateral wall of the right atrium between the orifice of the superior vena cava to the orifice of the inferior vena cava (IVC).
What is Atrium proper?
The right atrium is one of the four chambers of the heart. The heart is comprised of two atria and two ventricles. Blood enters the heart through the two atria and exits through the two ventricles. Deoxygenated blood enters the right atrium through the inferior and superior vena cava.
What is the moderator band?
In the human heart, the moderator band, or trabecula septomarginalis, is a muscle column that courses inferiorly from the right portion of the interventricular septum to the base of the anterior papillary muscle of the right ventricle This muscular structure is crossed by one or more arteries, which come from the …
What is Cor Triatriatum Dexter?
Cor triatriatum dexter is a rare congenital heart anomaly where the right atrium is divided into two chambers by a membrane. We report a boy who had persistent mild cyanosis and diagnosed to have cor triatriatum dexter with secundum atrial septal defect by transoesophageal echocardiography.
What is the sinus venosus?
The sinus venosus, or systemic venous sinus, is the cardiac chamber with myocardial walls located upstream of the right atrium in tetrapods and the single atrium in fish. It is the region that harbours the dominant cardiac pacemaker or sinus node (Carmona et al. 2018).
What separates the two atria?
The atria are separated from the ventricles by the atrioventricular valves: The tricuspid valve separates the right atrium from the right ventricle. The mitral valve separates the left atrium from the left ventricle.
What is a station tube?
The Eustachian tube is a small passageway that connects your throat to your middle ear. When you sneeze, swallow, or yawn, your Eustachian tubes open. This keeps air pressure and fluid from building up inside your ear. But sometimes a Eustachian tube might get plugged.
Which is an anatomic variant of the Chiari network?
An uncommon anatomic variant present in the right atrium, a Chiari network refers to a filamentous, weblike structure that results from incomplete resorption of the embryologic sinus venosus. Prevalence estimates for the general population vary widely, ranging from 2% – 10% of randomly selected, asymptomatic patients 2.
How is the Chiari network used in pulmonary embolism?
The Chiari network has also been described to protect from pulmonary embolism by acting as an inferior vena cava filter due to its sieve-like effect at the cavo-atrial junction. Here, the Chiari network has been described in a case of Ebstein anomaly of tricuspid valve which produced diagnostic confusion during echocardiography.
Where is the Chiari network located in the heart?
The Chiari network, encountered infrequently in the right atrium, is a fenestrated, net-like embryonic remnants of valves of sinus venosus, lying closely in relation to the inferior vena cava and coronary sinus, sometimes connecting these with other right atrial structures [1].
When does resorption of the Chiari network occur?
While thought to be of no innate clinical significance, the presence of a Chiari network is associated with the following 3: Resorption of the right valve of the embryologic sinus venosus occurs during the normal development of the right atrium, forming the Eustachian valve and the crista terminalis.