Intracranial dysfunctions: stupor and coma.
Coma and stupor are pathologic neural states whose signs arise from either massive cortical or brainstem disease or toxicity. A variety of pathological processes can cause brain disease. Often one has to begin treatment before the diagnosis of the cause of the problem is made. At all stages of treatment, great care must be taken to avoid precipitating an intracranial crisis. The physiological derangements that may aid in the diagnosis include arousability, pupil reactivity, various reflexes, breathing patterns, and cardiovascular function. The treatment needs to be both specific and general; i.e., the condition itself must be treated, if possible, and the intracranial pressure must be lowered if it has been raised by the condition. Treatments for raised intracranial pressure include hyperventilation, diuretics, corticosteroids, avoidance of jugular vein compression, coughing, and any change of the position of the head and neck from normal. When sedating or anesthetizing these patients, one should avoid drugs that increase cerebral blood flow such as ketamine and inhaled anesthetics, using instead drugs that lower cerebral blood flow such as thiopental, lidocaine, and narcotics (with ventilation).
Dayrell-Hart
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Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, Philadelphia.
Klide
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D000758:Anesthesia / Q000662:veterinary; D000818:Animals; D001927:Brain Diseases / Q000175:diagnosis / Q000662:veterinary*; D003128:Coma / Q000209:etiology / Q000628:therapy / Q000662:veterinary*; D007427:Intracranial Pressure; D012027:Reflex, Vestibulo-Ocular; D012119:Respiration