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Related Experiment Videos

Respirator retina.

R Y Foos, R H Rhodes

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |February 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Comatose patients on respirators showed specific retinal damage, primarily affecting inner nuclear layer cells like bipolar cells. This damage is linked to reduced blood flow (oligemia) in a critical retinal boundary zone.

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    Area of Science:

    • Ophthalmology
    • Neurology
    • Pathology

    Background:

    • Comatose patients requiring mechanical ventilation may experience systemic physiological changes.
    • The retina's inner nuclear layer is a critical area for visual processing and is known to be sensitive to ischemic events.

    Purpose of the Study:

    • To investigate characteristic pathological alterations in the retinas of comatose patients sustained by a respirator.
    • To determine the specific cell types affected within the inner nuclear layer and hypothesize the underlying cause of these changes.

    Main Methods:

    • Post-mortem examination of retinal tissue from 14 comatose patients.
    • Microscopic analysis to identify cellular changes such as autophagy, cell swelling, and coagulation necrosis.
    • Correlation of observed retinal lesions with patient's clinical status (respirator support duration).

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    Main Results:

    • Selective, patchy alterations were observed in the inner nuclear layer of the posterior fundus.
    • Bipolar cells were most frequently affected, with significant damage also noted in amacrine and horizontal cells.
    • Müller cells and vascular cells showed relative sparing; lesions were attributed to oligemia (ischemia) in the vascular watershed.

    Conclusions:

    • The inner nuclear layer of the retina is vulnerable to ischemic damage in comatose patients on ventilators.
    • Specific cellular pathology (autophagy, swelling, necrosis) characterizes retinal ischemia in this patient group.
    • The findings highlight the retina's susceptibility to compromised circulation, particularly in the boundary zone of its vascular supply.