Triple left ventricular outflow tract obstruction

Area of Science:

• Cardiology
• Cardiac Surgery
• Cardiovascular Disease

Background:

• Hypertrophic cardiomyopathy (HCM) can lead to dynamic left ventricular outflow tract obstruction (LVOTO).
• Systolic anterior motion (SAM) of the mitral valve is a common complication in HCM, exacerbating LVOTO.
• Surgical interventions for HCM and associated mitral valve dysfunction can sometimes lead to complex, evolving hemodynamic challenges.

Observation:

• A 59-year-old male patient with a history of HCM presented with recurrent LVOTO over a 5-year period.
• Initial LVOTO was attributed to asymmetric septal hypertrophy and SAM of the anterior mitral leaflet, treated with septal myectomy and mitral valve repair.
• Subsequent episodes of LVOTO were linked to complications from the mitral annuloplasty ring and anterior mitral leaflet displacement, necessitating valve replacement, and finally, SAM of the posterior mitral leaflet.

Findings:

• The patient experienced three distinct episodes of dynamic LVOTO, each with a different underlying mechanism.
• The initial presentation involved SAM of the anterior mitral leaflet secondary to HCM.
• Later episodes were complicated by prosthetic material (mitral ring) and altered mitral valve anatomy, ultimately leading to SAM of the posterior leaflet.

Implications:

• This case highlights the potential for dynamic LVOTO to recur or present with novel mechanisms following surgical interventions for HCM.
• It underscores the importance of careful surgical planning and consideration of potential hemodynamic alterations post-mitral valve surgery.
• Understanding these evolving mechanisms is crucial for effective management of complex LVOTO cases in patients with hypertrophic cardiomyopathy.