Clinical trial NCT01599936: Open Label Clinical Trial of Anascorp® in Pediatric Patients With Scorpion Sting Envenomation
Official title: Open Label, Confirmatory, Controlled Clinical Study of Alacramyn® in Pediatric Patients With Scorpion Sting Envenomation
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE3
Conditions: Scorpion Sting
Keywords: scorpion sting
envenomation
Anascorp
Lead sponsor: Instituto Bioclon S.A. de C.V.
Sponsor class: INDUSTRY
Collaborators: name: University of Arizona
name: Universidad Nacional Autonoma de Mexico
First posted: 2012-05-16
Enrollment: 50
Sex: ALL
Minimum age (years): 6
Maximum age (years): 18
Standard ages: CHILD
ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: There is no FDA approved therapy for the treatment of scorpion envenomation. Centruroides scorpion envenomation produces a pattern of neurotoxicity with a spectrum of severity ranging from trivial to life threatening. Patients stung by Centruroides scorpions develop a clinical syndrome which may require sedation with benzodiazepines and observation for 6 to 28 hours of intensive care monitoring. A safe therapy is necessary to halt the progression of symptoms early in the clinical course while avoiding the clinical deterioration that can occur en route to a tertiary facility. Alacramyn® is anticipated to be safer and more effective than the present standard of care, midazolam, and faster-acting thus eliminating the need to transport most rural patients and reducing hospitalization time.

Detailed description: The purpose of this open label, confirmatory, controlled clinical trial was to examine the safety and efficacy of Alacramyn® for treatment of patients envenomed by scorpion sting.

This study took place at San Carlos Indian Hospital in San Carlos, Arizona and in two pediatric Intensive care units in Tucson, Arizona.

Patients who arrived at the emergency department presenting with scorpion sting symptoms were evaluated for treatment with respect to the inclusion/exclusion criteria according to the study procedures. Only patients with clinically important systemic signs of scorpion sting envenomation were included in the study. Baseline measures included severity evaluation of the scorpion sting envenomation. The patient's vital signs, concomitant medication, medical history and demographic data were collected. Blood tests were done for haematology, chemistry, venom and anti-venom levels and urine test.

After informed consent and inclusion/exclusion criteria were obtained and verified, and the baseline measurements completed, three vials of Alacramyn® were administered. At the one hour assessment an additional vial of Alacramyn® was administered if important systemic signs of scorpion envenomation were present. The assessment was repeated at two hours and a final vial of Alacramyn® was administered if deemed necessary. Patient were discharged after the 4 hour assessment if symptoms were resolved. Prior to discharge repeat lab work, physical assessments, and vital signs were done. Those remaining for extended care underwent final study assessments at time of hospital discharge or at 24 hours after study drug infusion if hospitalization continued.

All patients who participated in the study were contacted 7 and 14 days after treatment, looking for symptoms suggestive of ongoing venom effect, delayed serum sickness, as well as for any other adverse event reported by the patient.

Eligibility criteria: Inclusion Criteria:

* Males and females 6 months to 18 years of age
* Presenting for emergency care within 5 hours with clinically important signs of scorpion sting envenomation
* Signed written Informed Consent by parent or legal guardian
* No participation in a clinical drug trial within the last month or concomitantly

Exclusion Criteria:

* Allergy to horse serum
* Use within the past 24 hours of drugs expected to alter immune response
* Use of any antivenom within the last month or concomitantly
* Underlying medical condition that significantly alters immune response
* Concurrent medical condition involving a baseline neurological status mimicking envenomation
* Pregnant and nursing women

Primary outcomes:
measure: Resolution of clinically important systemic signs of scorpion envenomation within four hours after Alacramyn administration.
timeFrame: Assessments conducted at 1, 2 and 4 hours post administration
Secondary outcomes:
measure: Demonstrate that venom blood levels will decrease within one hour after Alacramyn® treatment.
timeFrame: One hour
Other outcomes:
Locations:
city: San Carlos
country: United States
facility: San Carlos Indian Hospital
state: Arizona
city: Tucson
country: United States
facility: Tucson Medical Center
state: Arizona
city: Tucson
country: United States
facility: University Medical Center
state: Arizona
Study officials:
affiliation: Instituto Bioclon
name: Walter Garcia Ubbelohde, MD
role: STUDY_DIRECTOR
affiliation: VIPER Institute, University of Arizona
name: Leslie V. Boyer, MD
role: PRINCIPAL_INVESTIGATOR
affiliation: Universidad Nacional Autonoma de Mexico
name: Alejandro Alagon, PhD
role: STUDY_CHAIR
References:
citation: Boyer LV, Theodorou AA, Berg RA, Mallie J; Arizona Envenomation Investigators; Chavez-Mendez A, Garcia-Ubbelohde W, Hardiman S, Alagon A. Antivenom for critically ill children with neurotoxicity from scorpion stings. N Engl J Med. 2009 May 14;360(20):2090-8. doi: 10.1056/NEJMoa0808455.
citation: Likes K, Banner W Jr, Chavez M. Centruroides exilicauda envenomation in Arizona. West J Med. 1984 Nov;141(5):634-7.
citation: Gibly R, Williams M, Walter FG, McNally J, Conroy C, Berg RA. Continuous intravenous midazolam infusion for Centruroides exilicauda scorpion envenomation. Ann Emerg Med. 1999 Nov;34(5):620-5. doi: 10.1016/s0196-0644(99)70164-2.
citation: Berg RA, Tarantino MD. Envenomation by the scorpion Centruroides exilicauda (C sculpturatus): severe and unusual manifestations. Pediatrics. 1991 Jun;87(6):930-3. No abstract available.
citation: LoVecchio F, Welch S, Klemens J, Curry SC, Thomas R. Incidence of immediate and delayed hypersensitivity to Centruroides antivenom. Ann Emerg Med. 1999 Nov;34(5):615-9. doi: 10.1016/s0196-0644(99)70176-9.
citation: Curry SC, Vance MV, Ryan PJ, Kunkel DB, Northey WT. Envenomation by the scorpion Centruroides sculpturatus. J Toxicol Clin Toxicol. 1983-1984;21(4-5):417-49. doi: 10.3109/15563658308990433.