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The pulmonary outflow tract in classically corrected transposition.

R H Anderson, A E Becker, L M Gerlis

    The Journal of Thoracic and Cardiovascular Surgery
    |May 1, 1975
    PubMed
    Summary
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    Classically corrected transposition involves an abnormal pulmonary outflow tract due to septal malalignment, often leading to obstruction. Fibrous tissue tags, originating from the septum or valves, were the most frequent cause of this obstruction in studied specimens.

    Area of Science:

    • Cardiovascular Pathology
    • Congenital Heart Disease
    • Cardiac Anatomy

    Background:

    • Classically corrected transposition is a congenital heart defect affecting ventricular and great artery connections.
    • Understanding the pulmonary outflow tract morphology is crucial for managing associated obstructions.

    Purpose of the Study:

    • To investigate the morphology of the pulmonary outflow tract in classically corrected transposition.
    • To identify the nature and origin of obstructive structures within this tract.

    Main Methods:

    • Histological examination of 21 specimens with classically corrected transposition.
    • Detailed analysis of the pulmonary outflow tract, ventricular septum, and associated structures.

    Main Results:

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    • The pulmonary outflow tract is an oblique channel between malaligned mitral and tricuspid valves.
    • Obstruction, present in 57% of specimens, was commonly caused by fibrous tags originating from the septum or valves.
    • Incomplete membranous septum formation led to pulmonary artery communication with the morphologic right ventricle.

    Conclusions:

    • Septal malalignment and incomplete septum formation are key features in classically corrected transposition.
    • Fibrous tissue tags are a significant cause of pulmonary outflow tract obstruction in this anomaly.
    • The anterior positioning of cardiac conduction tissue relative to the outflow tract is noteworthy.