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Toxicology – Riot Control Agents (Tear Gas & Pepper Spray)
Source
Riot control agents are chemical irritants designed for law enforcement and personal defense. Common examples include pepper spray (oleoresin capsicum, derived from chili peppers), tear gases such as CS and CR, and older agents like CN (commonly known as mace). These substances are intended to be nonlethal but cause intense irritation.
Typical Presentation
Exposure usually occurs during confrontations or accidental discharge of self-defense sprays. Patients often present with acute eye and skin irritation shortly after exposure.
Clinical Features
Symptoms include intense eye pain, excessive tearing, redness, and involuntary eyelid closure, which can result in temporary visual impairment. Skin exposure causes burning and redness. Inhalation may lead to coughing, bronchospasm, and airway irritation. Symptoms typically improve within an hour, with full recovery expected within a day in most cases.
Mechanism of Action
Pepper spray works by activating pain receptors, triggering release of inflammatory mediators that cause burning and swelling. Tear gases act as chemical irritants, leading to inflammation of the eyes, skin, and respiratory tract. These effects result in vasodilation, redness, and increased secretions.
Management
Treatment involves immediate removal from the contaminated environment and thorough irrigation of exposed areas, especially the eyes and skin, with water. Supportive care is usually sufficient.
Key Points
Source
Riot control agents are chemical irritants designed for law enforcement and personal defense. Common examples include pepper spray (oleoresin capsicum, derived from chili peppers), tear gases such as CS and CR, and older agents like CN (commonly known as mace). These substances are intended to be nonlethal but cause intense irritation.
Typical Presentation
Exposure usually occurs during confrontations or accidental discharge of self-defense sprays. Patients often present with acute eye and skin irritation shortly after exposure.
Clinical Features
Symptoms include intense eye pain, excessive tearing, redness, and involuntary eyelid closure, which can result in temporary visual impairment. Skin exposure causes burning and redness. Inhalation may lead to coughing, bronchospasm, and airway irritation. Symptoms typically improve within an hour, with full recovery expected within a day in most cases.
Mechanism of Action
Pepper spray works by activating pain receptors, triggering release of inflammatory mediators that cause burning and swelling. Tear gases act as chemical irritants, leading to inflammation of the eyes, skin, and respiratory tract. These effects result in vasodilation, redness, and increased secretions.
Management
Treatment involves immediate removal from the contaminated environment and thorough irrigation of exposed areas, especially the eyes and skin, with water. Supportive care is usually sufficient.
Key Points
- Effects are rapid but generally short-lived.
- Eye exposure leads to temporary visual impairment due to intense irritation.
- Inhalation may worsen symptoms in individuals with respiratory conditions.
- Most exposures resolve completely with simple decontamination.
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