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Tox Bit: Huffing & Hydrocarbons

1/17/2017

2 Comments

 
Huffing, or abusing volatile vapors to induce intoxication, is a common form of recreational drug abuse, most seriously by younger teens and homeless children. More than 1,400 household products can be used as inhalants to get high.  Frequently the users inhale aerosol gases by using plastic or paper bags to concentrate the fumes. Effects of huffing range from an alcohol-like intoxication and euphoria to vivid hallucinations. Effects depend on the type and amount of substance.

Statistics on inhalant use may be significantly under-reported because deaths may be attributed to a discrete event, such as a stroke or heart attack, which may have been secondary to inhalant abuse. 10% of 8th graders have abused inhalants in the past year.

Classification of inhalants

Inhalants can be categorized by their product category (solvents, gases, or medical anesthestics) as well as by their effects or site of effect.
  • Solvents: a wide range of volatile substances that vaporize at room temperature, including a large number of petroleum products (gasoline or kerosene), toluene, and acetone.
  • Gases: Aerosols and propellants used in hair spray, deodorant, and whipped cream (nitrous oxide) as well as propane and butane.
  • Medical Anesthetics: nitrous oxide, ketamine, and other medical anesthetics can be abused and typically cause NMDA receptor antagonism causing hallucinogenic effects.

Clinical Presentation

Patients typically present with CNS depression, ataxia, or seizure disorders. Chronic exposure may result in behavioral changes or neuropathy. Patients may have hypotension or dysrhythmias. Skin around the oral or nasal mucosa may have irritation or blistering. Frost bite of mucosa may be present in those huffing 'keyboard sprays' or other compressed gases. Respiratory distress, pneumonitis, shortness of breath, and even progression to ARDs may occur. Aspiration should be suspected in those altered who may have vomited.

After initial presentation and with chronic use, patients may have hepatic or renal dysfunction.

Diagnostic Testing

Chest x-ray findings may be delayed by up to 6 hours. If patients are in respiratory distress, an immediate chest x-ray should be acquired. Otherwise, a 6-hour chest x-ray is adequate.

Bloodwork: ABG, CBC, CMP, and CO testing should be performed to evaluate for hepatotoxicity, acidosis, hypokalemia, and carbon monoxide.

Additional diagnostic testing should confirm or rule out co-ingestions.

Treatment

  • Decontamination: Remove contaminated clothing and wash skin to remove any additional agents. Whole bowel irrigation and charcoal is rarely indicated. Charcoal does not bind well to most hydrocarbons. Gastric lavage would only be indicated in rare cases that the hydrocarbon has high systemic toxicity and is present in larger amounts.
  • Supportive Therapy: Standard treatment for ABCs, including potentially intubation if needed. Epinephrine should be avoided due to increased cardiac sensitivity to catecholamine secondary to hydrocarbon intoxication.

Sudden Sniffing Death Syndrome

Sudden Sniffing Death Syndrome (SSDS) is heart failure secondary to using inhalants. Commonly abused inhalants increases the hearts sensitivity to epinephrine and catecholamines. When this is followed by a startle response or vigorous activity, the heart is at increased risk for dysrhythmias. Patients may present as a full arrest while in police custody, or found down from unknown causes.
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  • Clinical
    • Discharge Macros
    • Suboxone
    • Procedure Macros
    • Exam Macros
    • Pediatric Macros
    • Antibiogram
    • Follow Up
    • 2023 MDM
    • Heart Pathway
    • Jeromy's Macros
  • Education
    • EM Education
    • Critical Care
    • FOAM
  • Orientation
    • Dept Orientation
    • Cerner
    • Dragon
  • Links
    • Clinical Links
    • StatMacros
    • ICU Bootcamp
  • Private
    • MCS
    • GWU Contacts & Map