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Related Experiment Videos

Retinal detachment from hyperosmotic intravitreal injection.

M F Marmor

    Investigative Ophthalmology & Visual Science
    |December 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

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    High osmolarity solutions injected into the rabbit vitreous caused retinal damage, detachment, and degeneration. Even solutions around 500 mOsm induced visible retinal changes and electroretinogram abnormalities.

    Area of Science:

    • Ophthalmology
    • Retinal Physiology
    • Toxicology

    Background:

    • Intravitreal injections are common in ophthalmology.
    • The potential toxic effects of substances injected into the vitreous humor are not fully understood.
    • Osmotic effects may contribute to observed toxicity.

    Purpose of the Study:

    • To investigate the effects of hyperosmotic solutions injected into the rabbit vitreous on the retina.
    • To determine the threshold osmolarity causing retinal damage.
    • To assess the impact on retinal function as measured by electroretinography.

    Main Methods:

    • Injections of varying osmolarity hyperosmotic solutions (0.05 ml) into the vitreous of rabbit eyes.
    • Ophthalmoscopic examination to assess retinal changes.

    Related Experiment Videos

  • Electroretinogram (ERG) recordings to evaluate retinal function (a-, b-, and c-waves).

    • Main Results:

    • A 1000 mOsm solution caused rapid posterior retinal whitening, detachment, and degeneration.
    • Visible retinal changes occurred at osmolarities near 500 mOsm.
    • Hyperosmotic load caused immediate c-wave loss and slower decline of a- and b-waves in the ERG.
    • Various solutes (NaCl, EDTA, mannitol, sucrose, penicillin) showed similar effects at comparable osmolarities.

    Conclusions:

    • Hyperosmotic solutions injected into the vitreous can cause significant retinal damage and functional impairment.
    • Osmolarity is a critical factor to consider in vitreous injections, potentially explaining some drug toxicities.
    • Careful consideration of osmolarity is essential when planning intravitreal procedures.