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The pediatric spectrum of dynamic left ventricular obstruction
Insights
Pediatric dynamic left ventricular obstruction presents differently across age groups, with neonates showing transient hypertrophic cardiomyopathy and older children exhibiting IHSS or concentric hypertrophy. The spectrum of hypertrophic cardiomyopathy is wider in children than adults.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Pathophysiology
Background:
- Dynamic left ventricular obstruction (DLVO) is a complex cardiovascular condition.
- Understanding its varied presentations in pediatric populations is crucial for diagnosis and management.
Purpose of the Study:
- To examine the pathophysiologic mechanisms of dynamic left ventricular obstruction in pediatric patients.
- To describe the spectrum of DLVO presentations in neonates, infants, and older children.
Main Methods:
- Retrospective review of 21 pediatric patients with echocardiographic and/or hemodynamic evidence of DLVO.
- Analysis of clinical presentations, underlying conditions, and specific cardiac findings.
Main Results:
- Neonates often presented with transient hypertrophic cardiomyopathy, linked to maternal hypertension or diabetes.
- Infants with D-transposition of the great arteries showed subpulmonic dynamic obstruction.
- Older children and adolescents displayed findings consistent with idiopathic hypertrophic subaortic stenosis (IHSS) or concentric left ventricular hypertrophy.
Conclusions:
- The spectrum of hypertrophic cardiomyopathy in pediatric patients is broader than in adults.
- Age-specific pathophysiologic mechanisms contribute to diverse presentations of DLVO in children.
Abstract:
Twenty-one pediatric patients with echocardiographic and/or hemodynamic evidence of dynamic left ventricular obstruction are presented in order to examine the pathophysiologic mechanisms of this disorder. Neonates commonly had transient hypertrophic cardiomyopathy related to hypertension or to being infants of diabetic mothers. Infants with D-transposition of the great arteries sometimes developed signs of subpulmonic dynamic obstruction. Older children and adolescents had either classic findings of IHSS or concentric left ventricular hypertrophy. The spectrum of hypertrophic cardiomyopathy appears to be broader in pediatric patients than in adults.