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Related Experiment Videos

The opposite pupil in herniation.

A H Ropper1

  • 1Neurological/Neurosurgical Intensive Care Unit, Massachusetts General Hospital, Boston.

Neurology
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

Pupil changes in the opposite eye can signal brain herniation. Monitoring these pupil size and reactivity changes helps predict neurological deterioration in patients with transtentorial herniation.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neurosurgery

Background:

  • Transtentorial herniation is a critical neurological condition often associated with increased intracranial pressure.
  • Pupillary abnormalities are common indicators of brainstem compression.

Purpose of the Study:

  • To investigate the serial changes in the pupil opposite an enlarged pupil in patients with transtentorial herniation.
  • To determine the predictive value of these contralateral pupillary changes for neurological deterioration.

Main Methods:

  • Serial examination of pupillary size and light reaction in 13 patients with unilateral transtentorial herniation.
  • Observation of pupil changes in the contralateral eye.

Main Results:

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  • Stereotyped abnormalities observed: initial diminished light reaction with 2.5-4 mm pupil, followed by slight reduction, then re-enlargement.
  • Contralateral pupil remained round; transitional oval shape was infrequent.
  • Oculomotor function preserved until both pupils were enlarged and fixed.

    • Conclusions:

    • Changes in the contralateral pupil's size and reactivity can herald herniation and predict neurological deterioration.
    • Monitoring the opposite pupil provides valuable insights into the progression of transtentorial herniation.