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Succinyldicholine and the basic ocular deviation.

J S Mindel, J B Eisenkraft, E L Raab

    American Journal of Ophthalmology
    |March 1, 1983
    PubMed
    Summary
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    Succinyldicholine chloride can help determine basic ocular deviation in conscious individuals. However, vertical deviations limit its use in predicting strabismus surgery outcomes.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Pharmacology

    Background:

    • Basic ocular deviation is crucial for understanding eye alignment.
    • Extraocular muscles, particularly multiply innervated fibers, are implicated in maintaining eye position.

    Purpose of the Study:

    • To assess the utility of succinyldicholine chloride in measuring basic ocular deviation.
    • To evaluate the predictability of succinyldicholine-induced ocular positions for strabismus surgery outcomes.

    Main Methods:

    • Measuring ocular positions in conscious and anesthetized subjects using photographs.
    • Administering succinyldicholine chloride intravenously to anesthetized volunteers.
    • Comparing drug-induced ocular positions with conscious basic deviations and postoperative results.

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    Main Results:

    • Succinyldicholine chloride administration closely replicated conscious horizontal basic deviations in the primary position (ratio 0.99 +/- 0.01).
    • Human subjects exhibited vertical deviations with drug administration, affecting horizontal measurements.
    • Primate models (Macaca nemestrina, baboons) were unsuitable for predicting human responses.
    • Drug-induced positions did not predict postoperative strabismus surgery outcomes.

    Conclusions:

    • Succinyldicholine chloride supports the role of multiply innervated extraocular muscle fibers in basic deviation.
    • Vertical deviations limit the drug's value for quantitative strabismus surgery planning.
    • Succinyldicholine is not a reliable predictor of strabismus surgery results.