injuries and poisoning
Systemic Asphyxiant Chemical Warfare Agents
Symptoms of Systemic Asphyxiant Injuries
 initially causes gasping, a rapid heart rate, and high blood pressure. People may have seizures and lose consciousness in as little as 30 seconds. They may display signs that are similar to those of Tetanus , including lockjaw, grimacing, and arching of the neck. Their skin may appear flushed, but about half of people have a blue tinge to their skin. Hydrogen sulfideat high doses also can cause people to have seizures and lose consciousness. They may sustain heart damage. Continued exposure to low doses of hydrogen sulfide may irritate the eyes and membranes lining the nose and throat and cause headache, weakness, incoordination, nausea, vomiting, chest tightness, and hyperventilation. 