Congenital, acquired, or both? The only two congenitally based, acquired heart diseases

Area of Science:

• Cardiology
• Pediatric Cardiology
• Congenital Heart Disease

Background:

• Discrete subaortic stenosis (DSS) and double-chambered right ventricle are outflow tract obstructions.
• These conditions, despite congenital anatomical origins, are classified as acquired developmental heart diseases.
• Both are often associated with ventricular septal defects and can arise secondary to other cardiac surgeries.

Purpose of the Study:

• To explore the shared characteristics and pathogenetic mechanisms of DSS and double-chambered right ventricle.
• To highlight their acquired nature, association with VSDs, and potential for recurrence.
• To note the reported coexistence of these two conditions.

Main Methods:

• Review of existing literature on discrete subaortic stenosis and double-chambered right ventricle.
• Analysis of pathogenetic pathways including initial anatomical variations and subsequent hemodynamic changes.
• Examination of secondary development post-surgical interventions and recurrence rates.

Main Results:

• Both DSS and double-chambered right ventricle involve outflow tract obstruction and share similar characteristics.
• Pathogenesis involves initial anatomical abnormalities triggering hemodynamic processes leading to fibroproliferation (DSS) or muscle hypertrophy (double-chambered right ventricle).
• High recurrence rates, particularly for DSS, and coexistence of both conditions have been reported.

Conclusions:

• DSS and double-chambered right ventricle represent acquired developmental heart diseases with complex pathogenetic mechanisms.
• Understanding these mechanisms is crucial for managing these conditions, especially given their recurrence and potential coexistence.
• Further research may elucidate optimal management strategies for these challenging pediatric cardiac malformations.