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Infected insect bite of upper limb — Clinical Guidelines

Overview

Scorpion envenomation of the upper limb can lead to severe systemic complications, particularly in children, due to the potent neurotoxic and cardiotoxic effects of scorpion venom. Prompt recognition and management are crucial to prevent multi-organ dysfunction and mortality 1 2 5 6 7.

Diagnosis

Clinical History: History of scorpion sting, especially in endemic regions 1 7.

Physical Examination: Localized pain, swelling, and signs of systemic involvement (e.g., agitation, hypertension, tachycardia) 2 5 6.

Laboratory Tests: Elevated serum levels of biochemical parameters (glycemia, free fatty acids) may correlate with morbidity and mortality 2.

Severity Grading: Based on local and systemic involvement, including organ dysfunction criteria 4.

Management

First-Line Treatment: Antivenom administration as soon as possible 2 4 5.

Supportive Care: Fluid management, monitoring of vital signs, and management of shock and airway protection 5 6.

Specific Interventions: Sedation for agitation, anticonvulsants for seizures, and specific treatment for coagulopathy or renal failure if present 6.

Monitoring: Continuous monitoring for signs of multi-organ dysfunction, including neurological status, coagulation parameters, and renal function 5 6.

Special Populations

Pediatrics: Children are more susceptible to severe envenomation and require intensive monitoring and early antivenom therapy 2 4 5 7.

Pregnancy: Limited data; conventional management with close monitoring of both maternal and fetal status 8.

Comorbidities: Patients with pre-existing conditions like cardiovascular or renal disease may require tailored supportive care to manage organ dysfunction 5 6.

Key Recommendations

Administer antivenom promptly upon diagnosis of scorpion envenomation to reduce mortality and morbidity (Evidence: Strong 2 4).

Closely monitor children for signs of severe envenomation, including systemic involvement and organ dysfunction, given their higher risk (Evidence: Strong 2 4 5 7).

Implement supportive care measures including fluid management and specific interventions for shock, seizures, and coagulopathy (Evidence: Moderate 5 6).

Evaluate biochemical parameters (e.g., glycemia, free fatty acids) at admission to predict clinical outcomes in pediatric patients (Evidence: Moderate 2).

Tailor management in special populations, particularly focusing on pediatric and pregnant patients, with vigilant monitoring and individualized care plans (Evidence: Expert opinion 8).

References

1 Karmaoui A, Sereno D. Scorpionism at the human-environment interface: an eco-epidemiological synthesis and conceptual framework. Frontiers in public health 2026. link 2 Abd-Elbaseer KA, Abd-Elmawgood EA, Qubaisy HM, El-Saied AA, Abdel Naser MAA, Abd-Elraheem YF. Predictive Value of Glycemia and Free Fatty Acid Levels upon Admission of Children with Scorpionism in Egypt. The American journal of tropical medicine and hygiene 2022. link 3 Tomlinson H, Elston DM. What's eating you? the South African fattail scorpion revisited. Cutis 2019. link 4 Baseer KA, Naser MAA. Predictors for Mortality in Children with Scorpion Envenomation Admitted to Pediatric Intensive Care Unit, Qena Governorate, Egypt. The American journal of tropical medicine and hygiene 2019. link 5 Bahloul M, Regaieg K, Chabchoub I, Kammoun M, Chtara K, Bouaziz M. Severe scorpion envenomation: pathophysiology and the role of inflammation in multiple organ failure. Medecine et sante tropicales 2017. link 6 Cavari Y, Lazar I, Shelef I, Sofer S. Lethal brain edema, shock, and coagulopathy after scorpion envenomation. Wilderness & environmental medicine 2013. link 7 Bahloul M, Chabchoub I, Chaari A, Chtara K, Kallel H, Dammak H et al.. Scorpion envenomation among children: clinical manifestations and outcome (analysis of 685 cases). The American journal of tropical medicine and hygiene 2010. link 8 Nasr HB, Bolon B, Hammami ST, Sahnoun Z, Jamoussi K, Lahyani A et al.. Clinical pathology alterations in pregnant and non-pregnant rats following scorpion envenomation. Basic & clinical pharmacology & toxicology 2009. link 9 Meki AR, Hasan HA, El-Deen ZM, Bakkar S. Dysregulation of apoptosis in scorpion envenomed children: its reflection on their outcome. Toxicon : official journal of the International Society on Toxinology 2003. link00128-4) 10 Hutt MJ, Houghton PJ. A survey from the literature of plants used to treat scorpion stings. Journal of ethnopharmacology 1998. link00138-4) 11 Becerril B, Corona M, Coronas FI, Zamudio F, Calderon-Aranda ES, Fletcher PL et al.. Toxic peptides and genes encoding toxin gamma of the Brazilian scorpions Tityus bahiensis and Tityus stigmurus. The Biochemical journal 1996. link 12 de Dianous S, Kopeyan C, Bahraoui EM, Rochat H. Purification of contracture-inducing insect toxins from Buthinae scorpion venoms by immunoaffinity and high pressure liquid chromatography. Toxicon : official journal of the International Society on Toxinology 1987. link90123-1) 13 El Ayeb M, Delori P, Rochat H. Immunochemistry of scorpion alpha-toxins: antigenic homologies checked with radioimmunoassays (RIA). Toxicon : official journal of the International Society on Toxinology 1983. link90276-3) 14 Sizaret PY, Frank J, Lamy J, Weill J, Lamy JN. A refined quaternary structure of Androctonus australis Hemocyanin. European journal of biochemistry 1982. link 15 Newlands G. Review of Southern African scorpions and scorpionism. South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 1978. link

Infected insect bite of upper limb