Right ventricular outflow pouch associated with double-chambered right ventricle

Area of Science:

• Cardiology
• Pediatric Cardiology
• Congenital Heart Disease

Background:

• Double-chambered right ventricle is a congenital heart defect.
• Hemodynamic and cineangiocardiographic studies are crucial for diagnosis.
• Associated anomalies can impact clinical presentation and management.

Purpose of the Study:

• To describe a previously unrecognized abnormality associated with double-chambered right ventricle.
• To characterize the location, appearance, and potential development of this structure.
• To highlight its significance in the context of double-chambered right ventricle.

Main Methods:

• Retrospective analysis of 12 patients with double-chambered right ventricle.
• Complete hemodynamic and cineangiocardiographic studies.
• Detailed review of angiographic projections to visualize right ventricular anatomy.

Main Results:

• Seven of 12 patients (58%) exhibited a novel, actively contractile, pouchlike structure.
• This structure was consistently located in the right medial aspect of the right ventricle, near the outflow tract.
• The abnormality's visualization was optimized using specific injection sites and angiographic views.

Conclusions:

• A unique, contractile, pouchlike structure is frequently associated with double-chambered right ventricle.
• This finding is likely a postnatal development secondary to altered intracardiac blood flow.
• Recognition of this anomaly enhances understanding of double-chambered right ventricle pathophysiology.