Characterization of Left Ventricular Non-Compaction Cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Pathology

Background:

• Left ventricle non-compaction cardiomyopathy (LVNC) is a controversial cardiomyopathy with ongoing debates regarding its genetic basis, potential acquired nature, and diagnostic accuracy.
• Understanding the diverse etiologies and clinical trajectories of LVNC is crucial for accurate diagnosis and management.

Purpose of the Study:

• To investigate the genetic heterogeneity and clinical characteristics of LVNC patients.
• To evaluate the diagnostic yield of genetic testing and its correlation with clinical outcomes.

Main Methods:

• Identified 38 LVNC patients diagnosed via cardiac MRI (CMRI) or pathology.
• Performed next-generation sequencing (NGS) and clinical studies.
• Conducted anatomopathological examination on eight available hearts.

Main Results:

• The overall genetic yield for LVNC was 34.2%.
• Patients with negative genetic testing demonstrated better or improving left ventricular ejection fraction (LVEF) during follow-up.
• A potential trigger factor was identified in one-third of patients with negative genetic results.
• Cerebrovascular accidents (CVAs) occurred with similar frequency in both genetically positive and negative groups.

Conclusions:

• LVNC can arise through different pathways leading to a similar phenotype.
• Genetic testing provides valuable insights into LVNC etiology.
• LVNC cases without a clear genetic cause may exhibit a more favorable LVEF prognosis.
• Anticoagulation strategies for CVA prevention require careful consideration in all LVNC patients, irrespective of genetic status.