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Intoxication – Poisoning: Causes and Treatment

Intoxication refers to poisoning of the body by harmful substances. It can be caused by chemicals, medications, drugs, or natural toxins and requires prompt medical attention.

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Things worth knowing about "Intoxication"

Intoxication refers to poisoning of the body by harmful substances. It can be caused by chemicals, medications, drugs, or natural toxins and requires prompt medical attention.

What is Intoxication?

Intoxication is the state of being poisoned by a substance that is harmful to the body. The term is derived from the Latin word toxicum, meaning poison. Intoxication can result from exposure to medications, alcohol, illicit drugs, environmental toxins, plant or animal poisons, and industrial chemicals. It can occur as a single acute event or develop gradually through repeated long-term exposure.

Causes

The causes of intoxication are diverse. The most common include:

Medications: Overdose of prescription or over-the-counter drugs (e.g., paracetamol, sleeping pills, cardiac medications)
Alcohol: Acute alcohol poisoning from excessive consumption
Illicit drugs: Substances such as heroin, cocaine, or synthetic designer drugs
Environmental and industrial toxins: Heavy metals such as lead or mercury, pesticides, solvents
Plant toxins: Poisonous mushrooms (e.g., death cap), berries, or plant parts
Animal toxins: Snake bites, insect stings, or jellyfish contact
Carbon monoxide: An odorless gas produced by incomplete combustion

Symptoms

The symptoms of intoxication depend greatly on the substance involved, the amount absorbed, and the duration of exposure. Common general symptoms include:

Nausea, vomiting, and diarrhea
Altered consciousness or loss of consciousness
Dizziness and headaches
Irregular heartbeat or changes in blood pressure
Seizures
Difficulty breathing or slowed respiration
Changes in pupil size
Skin changes (redness, pallor, cyanosis)

Acute vs. Chronic Intoxication

Acute intoxication occurs rapidly following a single or short-term exposure to a large amount of a toxic substance. Chronic intoxication, on the other hand, develops gradually through repeated exposure to smaller quantities over an extended period, as seen with heavy metal poisoning.

Diagnosis

The diagnosis of intoxication is based on the patient history, clinical signs, and targeted investigations:

Medical history: Information about the substance involved, the amount, and the time of exposure
Laboratory tests: Blood and urine tests to detect toxic substances or their metabolites
Toxicological screening: Analysis targeting specific substances
Imaging: CT scans or other imaging may be required in certain cases
ECG: Cardiac monitoring when cardiotoxic substances are suspected

Treatment

Treatment of intoxication depends on the causative substance and the severity of poisoning. Key measures include:

First Aid Measures

Securing vital functions (consciousness, breathing, circulation)
Removing the source of poisoning (e.g., removing contaminated clothing, fresh air in gas exposure)
Calling emergency services or a poison control center

Medical Interventions

Decontamination: Gastric lavage or administration of activated charcoal to bind toxins in the gastrointestinal tract
Antidotes: Specific counteragents, e.g., N-acetylcysteine for paracetamol poisoning, naloxone for opioid overdose, or atropine for organophosphate poisoning
Supportive therapy: Intravenous fluids, oxygen administration, organ monitoring
Dialysis: In severe cases to remove toxins from the blood

Prevention

Many cases of intoxication can be prevented with simple precautions:

Store medications safely and out of reach of children
Always follow dosage instructions for medications
Use appropriate protective equipment when handling chemicals
Do not consume unknown mushrooms, berries, or plants
Install smoke detectors and carbon monoxide detectors indoors

When to Seek Medical Help?

If intoxication is suspected, medical help should be sought immediately. Poison control centers are available around the clock for guidance. In cases of unconsciousness, difficulty breathing, or seizures, emergency services should be called without delay.

References

Brent J. et al. - Critical Care Toxicology: Diagnosis and Management of the Critically Poisoned Patient. Springer, 2017.
World Health Organization (WHO) - International Programme on Chemical Safety (IPCS). Available at: https://www.who.int/ipcs
Olson K.R. (ed.) - Poisoning and Drug Overdose. McGraw-Hill, 7th edition, 2017.

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