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Black Widow Spider Antivenin for Patients With Systemic Latrodectism (BWSP3)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00657540
Recruitment Status : Completed
First Posted : April 14, 2008
Results First Posted : September 18, 2017
Last Update Posted : September 18, 2017
Rare Disease Therapeutics Inc.
Information provided by (Responsible Party):
Instituto Bioclon S.A. de C.V.

Study Type: Interventional
Study Design: Allocation: Randomized;   Intervention Model: Parallel Assignment;   Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor);   Primary Purpose: Treatment
Condition: Latrodectism
Interventions: Drug: Analatro
Drug: Saline

  Participant Flow

Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
Due to the nature of the treatment emergent condition of interest, no patients were actively recruited. Potential subjects presenting with moderate to severe pain associated with diagnosed latrodectism were evaluated at 16 sites across the United States. The first subject was enrolled on 10/08/09. The last subject completed the study on 10/27/14.

Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
No text entered.

Reporting Groups
Antivenin Latrodectus (Black Widow) Equine Immune F(ab)2

Antivenin Latrodectus (Black Widow) Equine Immune F(ab)2

Analatro: 30 mL of lyophilized antivenom, reconstituted in 50 mL saline infused over 10 minutes, up to 2 doses

Normal Saline

Normal Saline

Saline: 50 mL of saline infused over 10 minutes

Participant Flow:   Overall Study
    Antivenin Latrodectus (Black Widow) Equine Immune F(ab)2   Normal Saline
STARTED   29   31 
COMPLETED   28 [1]   27 [1] 
Lost to Follow-up                1                4 
[1] All subjects had know treatment failure disposition at time of loss to follow-up.

  Baseline Characteristics

  Outcome Measures

1.  Primary:   Proportion of Treatment Failures   [ Time Frame: From start of Dose 1 infusion to 48 hours post treatment ]

2.  Secondary:   Reduction in Pain Intensity   [ Time Frame: 30 minutes post treatment ]

3.  Secondary:   Drug-related Adverse Events   [ Time Frame: Start of Dose 1 through 17 days post treatment ]

4.  Secondary:   Reduction in Pain Intensity   [ Time Frame: Start of Dose 1 to any post-infusion time point ]

5.  Secondary:   Drug-related Serious Adverse Events   [ Time Frame: Start of Dose 1 through 17 days post treatment ]

  Serious Adverse Events

  Other Adverse Events

  Limitations and Caveats

Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
The study is limited by the small sample size; however this trial was powered appropriately for an orphan indication. The study is also limited by the difficulty in confirming latrodectism without a spider or clear history of seeing a spider.

  More Information

Certain Agreements:  
Principal Investigators are NOT employed by the organization sponsoring the study.
There is NOT an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.

Results Point of Contact:  
Name/Title: Victoria Anderson - Research Projects Manager
Organization: Rocky Mountain Poison and Drug Center
phone: 303-389-1236
e-mail: victoria.anderson@rmpdc.org

Responsible Party: Instituto Bioclon S.A. de C.V.
ClinicalTrials.gov Identifier: NCT00657540     History of Changes
Other Study ID Numbers: XF-07/03
First Submitted: April 9, 2008
First Posted: April 14, 2008
Results First Submitted: August 16, 2017
Results First Posted: September 18, 2017
Last Update Posted: September 18, 2017