title: Pupillary evaluation for differential diagnosis of coma.
abstract: OBJECTIVE
  To determine the usefulness of bedside evaluation of pupils in determining the aetiology of coma by adopting a probabilistic approach.
  
  
  METHODS
  One hundred and fifteen consecutive patients presenting with coma were enrolled in this prospective cohort during the 12 month study period in the emergency room of a community teaching hospital. Patients underwent structured clinical examinations and laboratory and imaging tests. Assignment of aetiology of coma was based on strict adherence to predetermined criteria and achieved by consensus of the two physician investigators. One year follow up was obtained in all patients.
  
  
  RESULTS
  Aetiology of coma was determined in 98% of the patients. It was metabolic in 69 patients (60%) and structural in 46 patients (40%). Metabolic causes included drug overdose, acute alcohol intoxication, hypoglycaemia, sepsis, and pneumonia. Structural causes included intracerebral haemorrhage, subarachnoid haemorrhage, cerebral infarction, subdural haematoma, and epidural haematoma. Multivariate logistic regression analysis showed light reflex loss (likelihood ratio for positive test result 3.59) and anisocoria (likelihood ratio for positive test result 9.0) as independent predictors of structural origin.
  
  
  CONCLUSIONS
  In this prospective study of patients presenting to the emergency room of a community based teaching hospital with coma, in about 60% the coma is of metabolic origins and in about 40% of structural origins. Light reflex loss and anisocoria suggest a structural aetiology.
authors.affiliation: Division of General Internal Medicine, Department of Medicine, Okinawa Chubu Hospital, Okinawa, Japan. tokuda_yasuharu@hosp.pref.okinawa.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Tokuda
authors.forename: N
authors.initials: N
authors.lastname: Nakazato
authors.forename: G H
authors.initials: GH
authors.lastname: Stein
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015875:Anisocoria / Q000209:etiology; D002561:Cerebrovascular Disorders / Q000150:complications / Q000175:diagnosis; D003128:Coma / Q000209:etiology*; D003937:Diagnosis, Differential; D062787:Drug Overdose / Q000150:complications / Q000175:diagnosis; D004630:Emergencies; D000431:Ethanol / Q000506:poisoning; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011681:Pupil Disorders / Q000209:etiology*
chemical_list: D000431:Ethanol