Management of gamexin poisoning

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Gamexin (Lindane / BHC / Hexachlorocyclohexane) Poisoning

Gamexin is the trade name for gamma-benzene hexachloride (γ-BHC), also known as lindane or hexachlorocyclohexane — an organochlorine insecticide. It belongs to the chlorinated hydrocarbon class (DDT, dieldrin, aldrin, chlordane are related compounds).

Mechanism of Toxicity

Organochlorines are central neurological stimulants. They antagonize GABA-mediated inhibition of central neurons, causing hyperexcitability with repetitive neuronal discharges after each action potential. They are highly lipid-soluble, accumulate in fatty tissues (including the brain), and induce hepatic microsomal enzymes — reducing efficacy of drugs metabolized by this system.

Routes of exposure: ingestion, inhalation, and dermal absorption (especially on abraded skin or with repeated application).

Clinical Features

Mild poisoning:

Dizziness, ataxia, fatigue, malaise, headache
Hyperexcitability, irritability, delirium, apprehension
Tremulousness, myoclonus, facial paraesthesiae

Severe poisoning:

Seizures — may occur early without prodrome; usually short-lived but status epilepticus can occur
Hyperthermia
Coma
Renal injury
Death

Additional hazards: Gamexin is often dissolved in hydrocarbon solvents that independently cause sedation, coma, and aspiration pneumonitis. Both the organochlorine and the solvent can sensitize the myocardium to catecholamines, creating risk of cardiac dysrhythmia.

Management

1. Decontamination

Dermal exposure: Remove all clothing immediately; wash skin thoroughly with mild soap and water.
Ingestion: Activated charcoal (if airway is protected and presentation is early); gastric lavage may be considered for large, recent ingestions.
Inhalation: Remove from exposure, administer oxygen.

2. Airway & Oxygenation

Administer supplemental oxygen.
Intubate if hypoxia occurs secondary to seizures, aspiration, or respiratory failure.

3. Seizure Control

Benzodiazepines are the first-line treatment (e.g., diazepam IV).
Phenobarbitone may be used for refractory seizures.

4. Cardiac Dysrhythmias

Monitor ECG.
Avoid epinephrine (adrenaline) — both organochlorines and co-ingested organic solvents sensitize the myocardium to catecholamines, and epinephrine can precipitate fatal ventricular fibrillation.

5. Hyperthermia

Managed by external cooling (tepid sponging, ice packs, cooling blankets).

6. Supportive Care

Monitor renal function.
Correct fluid and electrolyte imbalances.
Cholestyramine (an exchange resin) has potential utility for symptomatic patients exposed to certain organochlorines (e.g., chlordecone), though evidence is limited.

7. There is NO specific antidote.

Disposition

Observe for at least 6 hours after exposure.
Admit if any signs of toxicity develop, or if the ingestion involved a hydrocarbon solvent.

Key Points to Remember

Feature	Detail
Class	Organochlorine (chlorinated hydrocarbon)
Primary target	CNS (GABA antagonism)
Hallmark toxicity	Seizures (can occur without warning)
Antidote	None
Seizure Rx	Benzodiazepines
Drug to AVOID	Epinephrine
Decontamination	Soap & water (dermal); activated charcoal (ingestion)

— Tintinalli's Emergency Medicine: A Comprehensive Study Guide

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