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Surgical Correction for Pediatric Epiblepharon and Trichiasis
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Case Report: Exotropia Surgery in CPEO.

Ian M Macdonald, Edward S Johnson, Brad Wakeman

    The American Orthoptic Journal
    |December 15, 2010
    PubMed
    Summary
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    This study details managing exotropia in a patient with chronic progressive external ophthalmoplegia (CPEO) through surgery. Mitochondrial DNA deletion was confirmed in muscle tissue, showing characteristic abnormalities.

    Area of Science:

    • Ophthalmology
    • Mitochondrial Genetics
    • Neuromuscular Disorders

    Background:

    • Chronic progressive external ophthalmoplegia (CPEO) is a mitochondrial myopathy affecting ocular muscles.
    • Exotropia, an outward deviation of the eyes, can be a manifestation of neuromuscular dysfunction.
    • Surgical intervention is sometimes considered for managing strabismus in complex cases.

    Purpose of the Study:

    • To describe the surgical management of exotropia in a patient diagnosed with CPEO.
    • To investigate the underlying mitochondrial pathology in the affected patient's skeletal muscle.
    • To correlate clinical findings with molecular and ultrastructural evidence of mitochondrial disease.

    Main Methods:

    • Surgical correction of exotropia using bilateral medial rectus resections.

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  • Molecular genetic analysis of skeletal muscle DNA to detect mitochondrial DNA (mtDNA) deletions.
  • Transmission electron microscopy (TEM) of resected muscle tendon to evaluate mitochondrial morphology.

    • Main Results:

    • Successful surgical management of exotropia was achieved.
    • Molecular analysis confirmed a deletion in the mitochondrial DNA.
    • Electron microscopy revealed significant muscle fiber abnormalities, including ragged red fibers, indicative of mitochondrial dysfunction.

    Conclusions:

    • Bilateral medial rectus resection can effectively manage exotropia in patients with CPEO.
    • Confirmation of mtDNA deletion and characteristic ultrastructural changes supports the diagnosis of mitochondrial myopathy.
    • This case highlights the importance of integrating clinical, surgical, and molecular findings in managing complex ophthalmological conditions.