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Related Experiment Videos

The oculocardiac reflex in strabismus surgery.

J A Milot, J L Jacob, V F Blanc

    Canadian Journal of Ophthalmology. Journal Canadien D'Ophtalmologie
    |December 1, 1983
    PubMed
    Summary
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    Quick eye muscle traction during strabismus surgery frequently triggers the oculocardiac reflex in children. Gentle, progressive manipulation and cardiac monitoring are crucial for patient safety.

    Area of Science:

    • Ophthalmology
    • Pediatric Surgery
    • Cardiology

    Background:

    • The oculocardiac reflex, a drop in heart rate during eye surgery, is a known risk.
    • Understanding factors influencing this reflex is vital for patient safety in pediatric strabismus surgery.

    Purpose of the Study:

    • To investigate the cardiac response to traction on extraocular muscles during strabismus surgery in children.
    • To compare the incidence of the oculocardiac reflex based on muscle type, eye, and traction method.

    Main Methods:

    • Cardiac response was monitored using a microdisplacement transducer and cardiac monitor tachometer.
    • Calibrated traction was applied to 81 extraocular muscles in 49 pediatric patients undergoing strabismus surgery.
    • Traction was applied both progressively and quickly to assess reflex induction.

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    Main Results:

    • No significant difference in reflex induction was found between medial rectus and other muscles, or between eyes.
    • Quick traction induced the oculocardiac reflex in 87% of cases, significantly higher than progressive traction (51%, p < 0.05).

    Conclusions:

    • The oculocardiac reflex is frequently induced during strabismus surgery, particularly with quick muscle traction.
    • Continuous cardiac monitoring and gentle, progressive manipulation of extraocular muscles are recommended during pediatric strabismus surgery.