Abstract
Main Results: The study ofpatients in the intensive care unit was prompted by the observation of three postresuscitation patients whose pupillary light reflex was thought to be clinically absent but found to be present, although small, with infrared pupillometry. All patients in the intensive care unit with known brain death had an absent light reflex, whereas four of nine of those without brain death but with dilated nonreactive pupils had a small light reflex detectable by the infrared pupillometer. This reflex was characterized by a low maximum constriction velocity and low amplitude of constriction. Conclusion: Infrared pupillometry can sometimes reveal the presence of midbrain function that might otherwise be missed in paralyzed patients. (Arch Neurol. 1995;52:369-372)
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