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Myectomy for hypertrophic obstructive cardiomyopathy after failed alcohol septal ablation: clinicopathological
A A Arrazaghi1, J W Butany, W G Williams
1Department of Cardiology, Toronto General Hospital and University of Toronto, Toronto, Ontario, Canada.
Insights
Catheter-based alcohol ablation for hypertrophic cardiomyopathy (HCM) reduces symptoms by decreasing septal thickness. This novel treatment creates localized myocardial scarring, offering a new therapeutic avenue for this genetic heart condition.
Area of Science:
- Cardiology
- Interventional Cardiology
- Cardiac Imaging
Background:
- Hypertrophic cardiomyopathy (HCM) is a genetic heart disorder with varied clinical presentations.
- Current therapeutic goals focus on reducing intraventricular pressure gradients and alleviating symptoms.
- Echocardiography is the primary diagnostic tool for HCM.
Observation:
- A novel catheter-based intervention involves injecting 96% ethanol into coronary perforator branches.
- This procedure aims to reduce septal thickness and left ventricular outflow obstruction.
- The study presents long-term morphological features following this medical ablation technique.
Findings:
- Ethanol injection into perforator branches resulted in a localized area of myocardial scarring.
- Morphological findings were compared with echocardiographic data and existing literature.
- The procedure demonstrated effectiveness in reducing septal thickness and associated symptoms.
Implications:
- Catheter-based alcohol ablation offers a minimally invasive treatment option for obstructive hypertrophic cardiomyopathy.
- Localized myocardial scarring is a predictable long-term consequence of this intervention.
- Further research can explore the durability and broader application of this technique in managing HCM.
Abstract:
Hypertrophic cardiomyopathy - a genetically transmitted cardiac disorder - has diverse clinical, pathological and molecular manifestations. Echocardiography is the most reliable tool for clinical diagnosis of hypertrophic cardiomyopathy. Reduction of the intraventricular pressure gradient and improvement of symptoms are major objectives of all therapeutic strategies. The recently introduced concept of catheter-based interventional treatment involves selective coronary perforator branch injection of 96% ethanol to reduce septal thickness, left ventricular outflow obstruction, left ventricular filling pressure and symptoms. The long term morphological features after medical ablation are presented for the first time and compared with both the echocardiographic findings and the findings reported in the English-language literature. The findings show that injection of ethanol into the perforator branch is associated with a fairly localized area of myocardial scarring.