Epidemiology & Risk Factors
- Demographics: Adolescents (12–17 yo; peak 8th grade).
- Common Agents: Toluene (glue/spray paint), aerosols, gasoline, alkyl nitrites (“poppers”), N2O (“whippets”).
- Risk Factors: Low cost/easy household access, conduct disorder, polysubstance use.
Clinical Features
- Acute Intoxication: Rapid onset, brief duration (15–45 min); transient euphoria, ataxia, slurred speech, visual hallucinations, nystagmus, lethargy. c
- Physical Exam:
- “Glue sniffer’s rash”: Perioral/perinasal dermatitis.
- Chemical odor on breath/clothes; paint residue on hands/face.
- Chronic / N2O Toxicity: Subacute combined degeneration (SCD) presentation via functional vitamin B12 deficiency (ataxia, paresthesias). c
- Inhaled N2O oxidizes cobalt in vitamin B12
Diagnosis
- Initial/Screening: Clinical diagnosis. Standard UDS is negative.
- Key Labs:
- BMP: Hypokalemia, elevated Cr.
- ABG/VBG: High AG metabolic acidosis or Type 1 RTA (toluene).
- Co-oximetry: Methemoglobinemia (nitrites; cyanosis refractory to O2).
- MMA/Homocysteine: Elevated in chronic N2O use.
- ECG: Dysrhythmias, QTc prolongation.
Differential Diagnostics
- Alcohol Intoxication: Longer duration (hours), (+) blood/breath alcohol, no perioral rash.
- Opioid / Sedative Overdose: Depressed vitals, miosis (opioids), (+) routine UDS.
- PCP Intoxication: Rotatory/multidirectional nystagmus, violent agitation, (+) UDS.
Management
- Airway/Breathing/Circulation (ABC): Supplemental O2, cardiac monitor; wash skin/remove clothing.
- Agitation: Benzodiazepines (first-line). Avoid haloperidol (lowers seizure threshold, worsens QTc).
- Tachyarrhythmias: Short-acting beta-blockers (e.g., esmolol). Avoid epinephrine (myocardium is sensitized to catecholamines).
- Specific Antidotes:
- Methemoglobinemia: Methylene blue.
- N2O Toxicity: High-dose intramuscular vitamin B12.
- Long-Term: Psychosocial interventions (CBT); no approved medications.
Complications
- Sudden Sniffing Death Syndrome (SSDS): Fatal ventricular fibrillation from catecholamine surge.
- Asphyxiation / Chemical Pneumonitis: Bagging hypoxia, aspiration.
- End-Organ Damage: Toxic leukoencephalopathy, Type 1 RTA, methemoglobinemia, aplastic anemia (benzene).