What is chiari network?

Hint: Our heart has four valves that keep blood flowing in the right direction. In some cases, one or more of the valves don't open or close properly. This can cause the blood flow through your heart to your body to be disrupted.

Complete answer:
The Chiari network is movable, mesh-like structures oftenly present in the right atrium close to the opening of inferior vena cava and coronary sinus. This is mostly of no clinical importance and is often diagnosed incidentally. However, sometimes it can cause detectable confusion with right atrial pathologies, and may promote thromboembolism by causing flow obstruction. It may be related with infective endocarditis, arrhythmias, and migraine. At times, it acts as a physical hurdle during invasive procedures. The Chiari network has also been related to protect from pulmonary embolism by being an inferior vena cava filter due to its pore-bearing effect at the cavo-atrial junction. The Chiari network has been identified in a case of Ebstein anomaly of tricuspid valve which gave diagnostic confusion during echocardiography.
The Chiari network results from inability of resorption of the right sided sinus venosus valve. Evolutionarily, the right valve of the sinus venosus develops into two valves: the valve of the inferior vena cava i.e., Eustachian valve and the valve of the coronary sinus i.e., Thebesian valve. During involution of these valves, the tissue undergoes fenestration so that a network may be formed from remnants that usually disappears. The prevalence of Chiari network has variably been reported to be 2–13.6%.

Note:
The infection can occur due to bacteria entering into the bloodstream. Infection can be a consequence of many sources, including poor dental hygiene, tooth brushing that causes minor injury to the lining of the mouth or gums, dental procedures, implanted cardiovascular medical devices, chronic skin disorders and infections, burns, infectious diseases and more. These bacteria can go and infect the heart valves and cause infection of the endocardium.