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Mannitol-induced stria vascularis edema.

A J Duvall, M J Hukee, P A Santi

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |February 1, 1981
    PubMed
    Summary
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    Mannitol and glycerin, osmotic diuretics, cause stria vascularis edema similar to loop diuretics. This osmotic effect may reduce endolymph volume, potentially explaining hearing improvements in certain ear conditions.

    Area of Science:

    • Otolaryngology
    • Pharmacology
    • Cell Biology

    Background:

    • Stria vascularis edema is observed after administration of loop-inhibiting diuretics.
    • The morphological characteristics of this edema are not fully understood.
    • Osmotic diuretics may influence inner ear fluid dynamics.

    Purpose of the Study:

    • To investigate the effect of osmotic diuretics, specifically mannitol and glycerin, on the stria vascularis.
    • To compare the induced stria edema with that caused by loop diuretics.
    • To explore the potential mechanism of endolymph volume reduction by osmotic agents.

    Main Methods:

    • Administration of mannitol and glycerin to induce edema.
    • Morphological analysis of stria vascularis edema.

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  • Comparison with edema induced by loop-inhibiting diuretics.

    • Main Results:

    • Mannitol administration causes stria vascularis edema.
    • Glycerin administration also induces similar stria edema.
    • The observed edema is morphologically indistinguishable from that caused by loop diuretics.

    Conclusions:

    • Both mannitol and glycerin, acting osmotically, can induce stria vascularis edema.
    • This osmotic action may draw fluid from the endolymph into the stria.
    • Endolymph volume reduction is a potential mechanism explaining temporary hearing improvements observed with glycerin in endolymphatic hydrops.