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MydriasisAka: Pupil Dilation, Pupil Dilitation

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  1. Normal Response
    1. Sympathetic stimulation
    2. Dark lighting conditions
  2. Causes: Bilateral Dilated Pupil
    1. Mnemonic: AAAS
      1. Anticholinergic Toxicity or Atropine
      2. Antihistamines
      3. Antidepressants (Tricyclic Antidepressants)
      4. Sympathomimetics (Cocaine, Amphetamines)
    2. Carbon Monoxide Poisoning
  3. Causes: Unilateral Dilated pupil
    1. See Also Anisocoria
    2. Comatose patient
      1. Indicative of brain stem herniation
    3. Alert patient
      1. Not due to increased Intracranial Pressure
      2. Acute Glaucoma
      3. Mydriatic drug (e.g. Atropine)
      4. Cranial Nerve III paralysis
        1. Posterior Communicating Artery aneurysm
  4. Causes: Dilated pupil does not constrict with Pilocarpine
    1. Local Eye Trauma
    2. Topical anticholinergic agent present in eye

Mydriasis (C0026961)

Definition (MSH)Dilation of pupils to greater than 6 mm combined with failure of the pupils to constrict when stimulated with light. This condition may occur due to injury of the pupillary fibers in the oculomotor nerve, in acute angle-closure glaucoma, and in ADIE SYNDROME.
ConceptsFinding (T033)
EnglishDILATATION PUPILLARY, Dilated pupil, Large pupil, Mydriasis, Mydriatic pupil, Pupil dilated, Pupil dilation, PUPILLARY DILATION, PUPILS DILATED, Wide pupil
Spanishdilatación de la pupila, dilatacion de la pupila, midriasis, pupila dilatada, pupila grande, pupila midriática, pupila midriatica
CreditsDerived from the NIH UMLS (Unified Medical Language System)



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