Chlorobenzylidene malononitrile tear gas exposure: Rinsing with amphoteric, hypertonic, and chelating solution

Area of Science:

• Emergency Medicine
• Toxicology
• Ophthalmology

Background:

• Chlorobenzylidene malononitrile (CS) is a common riot control agent causing significant facial pain and irritation.
• Current decontamination protocols for CS exposure are often reactive and may not fully mitigate symptoms or recovery time.

Purpose of the Study:

• To evaluate the efficacy of an amphoteric, hypertonic, and chelating rinsing solution in mitigating the effects of CS exposure.
• To compare the effects of pre-exposure versus post-exposure application of the solution.

Main Methods:

• A study involving three groups of police officers exposed to CS: a control group (CS only), a pre-exposure group (solution applied before CS), and a post-exposure group (solution applied after CS).
• Measurements included facial pain levels (0-10 scale) during and after CS exposure, and time to reach a "ready for action" checkpoint.

Main Results:

• Pre-exposure application of the solution significantly reduced pain within the CS cloud (5.6 vs. 9.7) and at the checkpoint (1.1 vs. 2.3) compared to the CS-only group.
• Pre-exposure also significantly shortened the recovery time to reach the checkpoint (1:26 min vs. 2:28 min).
• Post-exposure application reduced residual pain at the checkpoint but did not significantly alter recovery time compared to the CS-only group.

Conclusions:

• The amphoteric, hypertonic, and chelating solution effectively reduces facial pain associated with CS exposure.
• Preventative application (pre-exposure) of this solution offers superior benefits by reducing both pain intensity and recovery duration.