- Published on
Toxicology – Inhalant Abuse (“Huffing”)
Source
Inhalant abuse involves breathing in vapors from volatile substances such as gasoline (hydrocarbons), aerosol sprays and computer dusters (halogenated hydrocarbons), nail polish remover (ketones), lighter fluid (butane), spray paints (toluene), nitrites (“poppers”), and nitrous oxide from whipped cream canisters.
Typical Presentation
Patients are often adolescents found with evidence of inhalant use, such as chemical-soaked materials. They may present with altered consciousness or unresponsiveness after exposure.
Clinical Features
Symptoms vary depending on the substance but may include skin flushing, irritation of the eyes and airways, poor coordination, slurred speech, hallucinations, lethargy, vomiting, seizures, respiratory depression, coma, or sudden death. Examination may reveal chemical odors, cardiac arrhythmias, QT prolongation, hypoxia, metabolic acidosis, anemia, or muscle breakdown. Chronic use can lead to cardiomyopathy, nerve damage, and brain dysfunction.
Mechanism of Action
The effects of inhalants are diverse and not fully understood. Many act as central nervous system depressants, possibly through NMDA receptor inhibition or GABA enhancement. They can also displace oxygen in the lungs, leading to hypoxia. A dangerous phenomenon known as “sudden sniffing death” can occur when a surge of catecholamines triggers fatal arrhythmias in a sensitized heart.
Management
Treatment is supportive, focusing on airway protection, oxygenation, and management of complications such as arrhythmias or seizures.
Key Points
Source
Inhalant abuse involves breathing in vapors from volatile substances such as gasoline (hydrocarbons), aerosol sprays and computer dusters (halogenated hydrocarbons), nail polish remover (ketones), lighter fluid (butane), spray paints (toluene), nitrites (“poppers”), and nitrous oxide from whipped cream canisters.
Typical Presentation
Patients are often adolescents found with evidence of inhalant use, such as chemical-soaked materials. They may present with altered consciousness or unresponsiveness after exposure.
Clinical Features
Symptoms vary depending on the substance but may include skin flushing, irritation of the eyes and airways, poor coordination, slurred speech, hallucinations, lethargy, vomiting, seizures, respiratory depression, coma, or sudden death. Examination may reveal chemical odors, cardiac arrhythmias, QT prolongation, hypoxia, metabolic acidosis, anemia, or muscle breakdown. Chronic use can lead to cardiomyopathy, nerve damage, and brain dysfunction.
Mechanism of Action
The effects of inhalants are diverse and not fully understood. Many act as central nervous system depressants, possibly through NMDA receptor inhibition or GABA enhancement. They can also displace oxygen in the lungs, leading to hypoxia. A dangerous phenomenon known as “sudden sniffing death” can occur when a surge of catecholamines triggers fatal arrhythmias in a sensitized heart.
Management
Treatment is supportive, focusing on airway protection, oxygenation, and management of complications such as arrhythmias or seizures.
Key Points
- Inhalants are often among the first substances misused by adolescents due to accessibility and low cost.
- Sudden death may occur unexpectedly, particularly during stress or sudden fright.
- Methods of use include “sniffing” (direct inhalation), “huffing” (using a soaked cloth), and “bagging” (inhaling from a container or bag).
0 Comments
