Surgical Myectomy after Failed Ablation for Hypertrophic Obstructive Cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Cardiac Surgery

Background:

• Hypertrophic cardiomyopathy (HCM) is a genetic myocardial disease causing left ventricular hypertrophy.
• Left ventricular outflow tract obstruction in HCM, refractory to medication, requires surgical myectomy or alcohol septal ablation.
• Recurrence of obstruction can necessitate further intervention.

Purpose of the Study:

• To report a unique case of recurrent hypertrophic cardiomyopathy obstruction after alcohol septal ablation.
• To describe the surgical management of complex anatomical findings contributing to obstruction.
• To evaluate the efficacy of surgical myectomy in achieving relief of obstruction.

Main Methods:

• Surgical myectomy was performed for recurrent left ventricular outflow tract obstruction.
• Extensive papillary muscle mobilization was a key surgical technique.
• Pre-operative and post-operative assessments evaluated the degree of obstruction.

Main Results:

• The patient presented with obstruction recurrence one year after alcohol septal ablation.
• Intraoperative findings included a firm subaortic membrane and direct papillary muscle insertion into the mitral valve.
• Significant relief of left ventricular outflow tract obstruction was achieved post-myectomy and papillary muscle mobilization.

Conclusions:

• Surgical myectomy can be effective in managing recurrent obstruction in hypertrophic cardiomyopathy.
• Addressing specific anatomical abnormalities, such as subaortic membranes and abnormal papillary muscle insertions, is crucial for successful surgical outcomes.
• This case underscores the importance of tailored surgical approaches for complex hypertrophic cardiomyopathy cases.