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Related Experiment Videos

Brown spider envenomation.

Michael E Peterson1

  • 1Reid Veterinary Hospital, 933 SW Queen Avenue, Albany, OR 97321, USA. petersonkate@netscape.net

Clinical Techniques in Small Animal Practice
|February 3, 2007
PubMed
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Brown recluse spider venom, containing sphingomyelinase D, causes necrotic skin lesions and potentially fatal systemic effects like hemolytic anemia. Early diagnosis and treatment are crucial as no specific antidote exists.

Area of Science:

  • Toxicology
  • Dermatology
  • Arachnology

Background:

  • Spiders of the genus Loxosceles, including the brown recluse spider (Loxosceles reclusa), are known for their potent venom.
  • Dermonecrotic lesions caused by Loxosceles venom are often misdiagnosed, particularly in areas without native Loxosceles populations.

Purpose of the Study:

  • To detail the clinical presentation and pathophysiology of Loxosceles envenomation.
  • To highlight the diagnostic challenges and potential complications of brown recluse spider bites.

Main Methods:

  • Review of the known effects of Loxosceles venom, focusing on the role of sphingomyelinase D.
  • Description of the characteristic lesion development and systemic manifestations.

Main Results:

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  • Sphingomyelinase D is the primary factor causing dermonecrosis, capillary occlusion, and tissue damage.
  • Lesions progress from erythema to a necrotic center, healing slowly and leaving scars.
  • Systemic effects, such as hemolytic anemia and hemoglobinuria, can be life-threatening.

Conclusions:

  • Loxosceles envenomation requires prompt recognition and management due to potential for severe tissue damage and systemic toxicity.
  • While no specific antidote exists, conservative wound care and aggressive management of systemic signs, including hospitalization, are vital.
  • Dapsone has shown efficacy in animal models for treating dermal lesions.