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Exotropia caused by pit viper snakebite.

Hoon Dong Kim1, Moon Sun Jung, So Young Kim

  • 1Department of Ophthalmology, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Republic of Korea.

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|August 18, 2009
PubMed
Summary
This summary is machine-generated.

Pit viper snake venom can cause rare neurotoxic complications affecting eye muscles. This case details the first instance of comitant exotropia following a pit viper bite, without typical paralytic signs.

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Area of Science:

  • Ophthalmology
  • Toxicology
  • Neurology

Background:

  • Pit viper snake venom is known to possess mild neurotoxic properties.
  • Neurotoxic complications, such as paralytic strabismus, can rarely occur following pit viper envenomation.
  • Extraocular muscles are particularly vulnerable to these neurotoxic effects, with the medial rectus muscle frequently implicated in prior reports.

Observation:

  • This report presents a unique case of a patient who experienced a pit viper snakebite.
  • The patient developed comitant exotropia, a condition where the eyes turn outward.
  • Notably, the exotropia in this case did not present with obvious paralytic features typically associated with such envenomations.

Findings:

  • This is the first documented case of pit viper snakebite leading to comitant exotropia.
  • The observed exotropia occurred without the paralytic signs commonly seen in similar neurotoxic complications.
  • The findings suggest a potentially atypical presentation of neurotoxicity affecting ocular motility after pit viper envenomation.

Implications:

  • This case expands the known spectrum of ocular motility disorders following pit viper snakebites.
  • It highlights the need for ophthalmological evaluation in patients with pit viper envenomation, even in the absence of overt paralysis.
  • Further research may elucidate the specific mechanisms underlying this non-paralytic presentation of ocular muscle dysfunction after snakebite.