UMEM Educational Pearls

Category: Toxicology

Title: Black Widow Spider

Keywords: latrodectus, black widow, spider (PubMed Search)

Posted: 9/11/2008 by Fermin Barrueto, MD (Updated: 2/18/2020)
Click here to contact Fermin Barrueto, MD

 Latrodectus sp (Black Widow Spider)

  • The only indigenous neurotoxic insect  in the state of Maryland and found through many states in the US
  • The "bite" often not visible and does not cause a necrotic lesion like the brown recluse
  • Causes Acetycholine release from post-synaptic motor and sensory nerves
  • This leads to intense muscle contraction and pain. There have been reports of a black widow spider on the leg and the patient undergoes ex lap surgery for suspected acute abdomen only to find out the abdominal muscles were fasciculating due to envenomation
  • Treat with aggresive analgesia and benzodiazepines.
  • Not often lethal with approximately 60-70 deaths in the US over 30 years

Take a look at a picture of the black widow on the following attachment


Attachments

black-widow-spider-1.jpg (14 Kb)