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. 2017 Apr 21;9(4):148.
doi: 10.3390/toxins9040148.

Treatments for Latrodectism-A Systematic Review on Their Clinical Effectiveness

Nicole M Ryan  1 , Nicholas A Buckley  2 , Andis Graudins  3
Affiliations

Treatments for Latrodectism-A Systematic Review on Their Clinical Effectiveness

Nicole M Ryan et al. Toxins (Basel). .

Abstract

Latrodectism or envenomation by widow-spiders is common and clinically significant worldwide. Alpha-latrotoxin is the mammalian-specific toxin in the venom that results in toxic effects observed in humans. Symptoms may be incapacitating and include severe pain that can persist for days. The management of mild to moderate latrodectism is primarily supportive while severe cases have variously been treated with intravenous calcium, muscle relaxants, widow-spider antivenom and analgesic opioids. The object of this systematic review is to examine the literature on the clinical effectiveness of past and current treatments for latrodectism. MEDLINE, EMBASE and Google Scholar were searched from 1946 to December 2016 to identify clinical studies on the treatment of latrodectism. Studies older than 40 years and not in English were not reviewed. There were only two full-publications and one abstract of placebo-controlled randomised trials on antivenom use for latrodectism. Another two randomised comparative trials compared the route of administration of antivenom for latrodectism. There were fourteen case series (including two abstracts), fourteen case reports and one letter investigating drug treatments for latrodectism with the majority of these also including antivenom for severe latrodectism. Antivenom with opioid analgesia is often the major treatment reported for latrodectism however; recent high quality evidence has cast doubt on the clinical effectiveness of this combination and suggests that other treatments need to be investigated.

Keywords: antivenom; envenomation; red-back spider; treatment; widow spider.

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Conflict of interest statement

The authors declare no conflict of interest. The funding sponsors had no role in the writing of this manuscript.

Figures

Figure 1
Figure 1
Graph of Pain Responders (Treatment Success) to IV Antivenom compared to Pain Responders (Treatment Success) to IM Antivenom or Placebo. # response at 24 h not at specified primary outcome.
Figure 2
Figure 2
RevMan meta-analysis and Forest Plot of the five randomised controlled trials on antivenom for pain from latrodectism.
See this image and copyright information in PMC

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