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Left ventricular noncompaction: a pathological study of 14 cases.

Allen Burke1, Erik Mont, Robert Kutys

  • 1Department of Cardiovasular Pathology, Armed Forces Institute of Pathology, Washington, DC 20306, USA.

Human Pathology
|May 14, 2005
PubMed
Summary

Left ventricular noncompaction (LVNC) is a cardiomyopathy characterized by a spongy inner layer of the left ventricle. This study details its pathological findings in children, often associated with other cardiac defects and frequently diagnosed post-mortem.

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Area of Science:

  • Cardiovascular Pathology
  • Pediatric Cardiology
  • Medical Genetics

Background:

  • Left ventricular noncompaction (LVNC) is increasingly recognized as a distinct cardiomyopathy.
  • Limited pathological data exists, particularly concerning pediatric cases.
  • Understanding LVNC's morphology is crucial for diagnosis and management.

Purpose of the Study:

  • To describe the gross and microscopic pathological findings of left ventricular noncompaction (LVNC) in a pediatric cohort.
  • To investigate the association of LVNC with congenital heart disease and other cardiac anomalies.
  • To highlight diagnostic challenges, especially in autopsy settings.

Main Methods:

  • Retrospective analysis of 14 pediatric hearts (13 autopsy, 1 explant) with LVNC.

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  • Detailed gross examination focusing on ventricular wall morphology and trabeculations.
  • Histopathological evaluation including endocardial and myocardial features.
  • Correlation of LVNC findings with clinical data and associated cardiac anomalies.

    • Main Results:

    • LVNC was defined by a noncompacted inner layer comprising >50% of LV thickness and poorly developed papillary muscles.
    • Common histological features included endocardial fibroelastosis and staghorn-shaped recesses.
    • Right ventricular involvement occurred in 6 of 14 cases.
    • 8 of 14 cases had associated cardiac anomalies (e.g., VSD, pulmonary stenosis).
    • Sudden unexpected death was the primary presentation in 10 cases.
    • Diagnosis was rarely suspected antemortem (1/13 autopsy cases).

    Conclusions:

    • LVNC in children often presents with severe cardiac anomalies and has a high mortality rate, frequently due to sudden death.
    • Morphological distinction between isolated and secondary LVNC is not always clear.
    • Pathologists play a key role in diagnosing LVNC, often for the first time at autopsy.