Prominent prolapsing Chiari network: presentation and prognosis in paediatric patients

Area of Science:

• Cardiology
• Pediatric Cardiology
• Echocardiography

Background:

• The Chiari network is a rare, web-like structure within the right atrium.
• While typically small and thin, it can become prominent, leading to prolapse into the right ventricle and potential complications.

Purpose of the Study:

• To investigate the characteristics of a prolapsing Chiari network in pediatric patients.
• To document associated cardiac abnormalities and their natural course.
• To assess changes in Chiari network prolapse and related conditions over time.

Main Methods:

• Retrospective analysis of 38 pediatric patients with prolapsing Chiari network.
• Echocardiographic measurement of cardiac parameters, including Chiari network prolapse extent and valve annulus z-values.
• Comparison of findings with normative data and follow-up assessment.

Main Results:

• Prolapse averaged 9.1 mm below the tricuspid annulus; pulmonary valve annulus z-value was reduced, and aortic valve z-value enlarged.
• 14 patients (37%) had no other cardiac defects; others had atrial septal defects, arrhythmias, or valve issues.
• Follow-up showed decreased prolapse (median 2 mm) and spontaneous resolution of many associated abnormalities.

Conclusions:

• Prolapsing Chiari network is associated with a significant risk of congenital heart defects (CHDs).
• The degree of prolapse and associated abnormalities tend to diminish with patient growth.
• While interventions are sometimes necessary, many cases show favorable natural resolution.