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Convulsants (Convulsant Toxidrome)

Concise toxidrome definition: Central nervous system (CNS) disinhibition or excitation (glycine or GABA antagonism, glutamate agonism), leading to generalized convulsions.

Rationale or reasoning for toxidrome decisions: The name was chosen based upon clinical relevance and accuracy as well as ease of recall. Examples of names initially considered: General convulsant toxidrome, convulsants, convulsions, and seizures nothing else.

Issues or concerns about this toxidrome: The difference between seizures and convulsions needs to be emphasized in training.

Convulsant examples of industrial chemicals and potential chemical warfare/terrorism agents: Hydrazines, TETS, picrotoxin, and strychnine.

The clinically relevant routes of exposure and types of sources: Inhalation, ingestion, and dermal.

The organ systems generally affected: Central nervous system (CNS).

The initial signs and symptoms: Refractory status epilepticus.

A progression of signs and symptoms includes: Dose-related onset of convulsions; rapidly fatal if untreated.

The underlying pathology, biological processes, or modes of action include: GABA antagonism.

Common treatment protocol, specific antidotes and key supportive measures: Benzodiazepines, barbiturates, and pyridoxine.

Source:
Report to the Toxic Chemical Syndrome Definitions and Nomenclature Workshop (PDF - 2.01 MB) (DHS, NLM, May, 2012)

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Information from Other Resources

Resource Comparison

Information from CDC, WISER, and CAMEO
Emergency Response Safety and Health Database (CDC/NIOSH) More Information Close ERSH-DB is a occupational safety and health database developed by NIOSH for the emergency response community. Contains high-priority agents in terrorist events Information includes: Agent characteristics Personal protective equipment Emergency response Signs/symptoms Decontamination First aid Long-term implications On-site fatalities Occupational exposure limits Acute expousre guidelines Decontamination (environmental and equipment) Agent properties Hazardous materials warning labels/placards Trade names and other synonyms Who to contact in an emergency Important notice Strychnine WISER (NIH/NLM) More Information Close WISER is a system designed to assist first responders in HAZMAT incidents. Data derived from HSDB and DOT Emergency Response Guidebook Information includes: Substance identification Protective equipment/clothing Protective distance Fire fighting procedures Reactivities/incompatibilities Treatment overview and many more... Hydrazine Other chemicals with Hydrazine in their names CAMEO (EPA, NOAA) More Information Close CAMEO is a database of response information for thousands of hazardous materials MyChemicals: build a customized list of chemicals Predicts reactivity of 2 chemicals Information includes: Chemical identifiers Hazards Response recommendations Physical properties Regulatory information Alternate chemical names Hydrazine, Hydrate Hydrazine, Anhydrous Hydrazine, Aqueous Solutions, with more than 37% Hydrazine Other chemicals with Hydrazine in their names Picrotoxin, as Cocculus Strychnine Other chemicals with Strychnine in their names	Medical Management Guidelines for Acute Chemical Exposures (CDC/ATSDR) More Information Close MMGs for Acute Chemical Exposures were developed by ATSDR to aid emergency department physicians and other emergency healthcare professionals. Guidelines for managing acute exposures resulting from chemical incidents Information includes: Basic chemical and exposure information Summary of potential health effects Prehospital management information Emergency department management information Information for the patient None Chemical Emergencies (CDC) More Information Close A collection of CDC resources for professionals, including: Case definition Toxic syndrome description Toxicology profiles Training First responders Medical management Emergency response cards Lab info Surveillance Preparation & planning Hydrazine Strychnine

Additional Resources:

ChemIDplus - Chemical dictionary, structures, and links to many Internet resources (NIH/NLM)
Hydrazine, Tetramethylenedisulfotetramine, Picrotoxin, Strychnine

Hazardous Substances Data Bank - Comprehensive, peer-reviewed toxicology data (NIH/NLM)
Hydrazine, Picrotoxin, Strychnine

Report on Toxic Chemical Syndromes: Definitions and Nomenclature (PDF - 2.01 MB)

An Interagency Agreement between the Department of Homeland Security (DHS) Office of Health Affairs (OHA) and the National Library of Medicine led to a workshop to discuss and develop a consistent lexicon to describe toxic chemical syndromes, or toxidromes. This workshop included practitioners and experts in emergency response, emergency medicine, and medical toxicology developed names and definitions for twelve unique toxidromes that describe and differentiate the clinical signs and symptoms from exposures to chemicals. These toxidromes focus on acute signs and symptoms caused by inhalation and dermal exposures, and each toxidrome is characterized by exposure routes and sources, organs/systems affected, initial signs and symptoms, underlying mode of action, and treatment/antidotes. The toxidrome names and definitions are designed to be readily understood and remembered by users since communication in a crisis requires accurate and succinct terms that can quickly convey the health conditions of patients. These toxidromes lay the foundation for a consistent lexicon for use in CHEMM and for other uses that, if adopted widely, will improve response to chemical mass exposure incidents.

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