Evidence-Based Management of Box Jellyfish Stings.

INTRODUCTION

Rapidly acting and highly effective management approaches are critically needed for potentially life-threatening and career-ending stings by box jellyfish (phylum Cnidaria, class Cubozoa) among underwater-operation warfighters working in austere environments. Cubozoan envenomation results in venom load- and time-dependent complex sequelae, including acute-phase hemolysis, cardiorespiratory collapse, hypovolemic shock, and death. Despite previously published studies demonstrating the failure of various generally advised, lay first-aid approaches (including fresh-water rinsing, ice-pack application, and skin scraping) to inhibit box jellyfish venom-induced hemolysis and tissue damage in vitro, ineffective and even deleterious management practices persist. In this report, we compared the efficacy of generally used first-aid measures and recently developed copper gluconate (CuGluc)-containing formulations in halting venom-associated tissue damage using a variety of assay systems, including an in vivo anesthetized piglet model.

MATERIALS AND METHODS

The comparative efficacy of common first-aid approaches, including vinegar dousing, hot- and cold-pack applications, gasoline, topical 2-hydroxypropyl-β-cyclodextrin (HPβCD), and novel therapeutics, including CuGluc-containing formulations, was assessed using a variety of platforms, including in vitro hemolytic assays, live-tentacle sting tissue-model assays on blood agar or freshly excised porcine skin, and an in vivo piglet model.

RESULTS

Sequential topical application of CuGluc-containing formulations (StingNoMore Spray followed by StingNoMore Cream) surpassed all other management approaches in reducing sting-induced hemolysis and tissue damage in all in vitro and in vivo assay platforms. To a lesser extent, vinegar dousing of the sting site, followed by application of heat (42-45 °C) by hot pack for 45 minutes, also directly and irreversibly inhibited venom activity. Saltwater rinse and ice pack were totally ineffective and led to more tissue damage than the untreated sting itself.

CONCLUSIONS

Compared to all other tested first-aid approaches, CuGluc-containing topical spray and cream formulations resulted in far less cubozoan venom-associated tissue damage and represents the most effective method to manage box jellyfish stings.