Prehospital Academy Lesson 27.9
Toxicology: Common Household Items
This lesson provides EMTs with essential knowledge to identify, assess, and manage patients exposed to common over-the-counter (OTC) medications and household products. Recognizing these toxidromes is crucial for appropriate prehospital care, especially when patients present with altered mental status.
Hydrocarbon Toxicity
Hydrocarbons are commonly found in petroleum products (e.g., gasoline, lighter fluid, paint thinners). Toxicity depends on viscosity, volatility, and surface tension. Lower viscosity and higher volatility increase the risk of aspiration and central nervous system (CNS) effects.
Clinical Presentation:
Aspiration: Coughing, choking, dyspnea, wheezing, chemical pneumonitis.
CNS Effects: Dizziness, headache, confusion, seizures, coma.
GI Irritation: Nausea, vomiting, abdominal pain.
Management:
Decontamination: If surface exposure, remove contaminated clothing and wash skin thoroughly with soap and water.
Airway: Establish and maintain an airway. Be prepared for aspiration.
Breathing: Administer supplemental oxygen as needed.
Circulation: For advanced providers, IV access and ECG monitoring are important. Fluid boluses of normal saline may be needed for hypotension.
Transport: Transport to an appropriate facility.
Non-Prescription Pain Medications
This category primarily includes Nonsteroidal Anti-inflammatory Drugs (NSAIDs) like ibuprofen, and salicylates like aspirin.
1. NSAID Overdose (e.g., Ibuprofen):
Presentation: Many NSAID overdoses remain asymptomatic. At toxic levels, signs can include nausea, vomiting, abdominal pain, and drowsiness. Liver toxicity is a concern with massive overdoses.
Management:
Supportive care: ABCs, supplemental oxygen if needed.
For advanced providers: Establish IV access, ECG monitoring. Treat hypotension with normal saline. Treat seizures with benzodiazepines.
Transport to an appropriate facility.
2. Salicylate Toxicity (Aspirin Overdose):
Presentation: Can vary based on age, dose, and duration. Tinnitus (ringing in ears), nausea, vomiting, tachypnea (rapid breathing), hyperthermia, altered mental status, metabolic acidosis.
Management:
Supportive care: ABCs, supplemental oxygen.
For advanced providers: IV access, normal saline for hypotension. Monitor carbon dioxide levels (capnography) due to respiratory impact.
Activated charcoal: If standing orders allow, can be helpful for recent ingestions.
Transport to an appropriate facility.
Acetaminophen (Tylenol) Toxicity
Acetaminophen is generally well-tolerated at therapeutic doses, but overdose can lead to severe liver damage and is a common cause of intentional self-harm.
Pathophysiology:
Overdose overwhelms the liver's normal detoxification pathways, leading to the accumulation of a toxic metabolite (NAPQI) that causes hepatocellular necrosis.
Clinical Presentation (Four Stages):
Stage 1 (Less than 24 hours): Nausea, vomiting, loss of appetite, malaise. Often asymptomatic.
Stage 2 (24-72 hours): Right upper quadrant pain (liver insult), tender abdomen, elevated liver enzymes.
Stage 3 (72-96 hours): Peak liver toxicity, metabolic acidosis, renal failure, coagulopathies, jaundice, encephalopathy.
Stage 4 (4-14 days): Resolution of liver failure or progression to multi-organ failure and death. This is a very painful and long-term pathology.
Management:
Prehospital: Largely supportive. ABCs, supplemental oxygen if needed.
Activated Charcoal: If ingestion is recent (within 1-2 hours) and standing orders allow.
Antidote: N-acetylcysteine (NAC) is the antidote, but must be administered early in the hospital setting.
Transport: Rapid transport to an appropriate facility for definitive care and antidote administration.
Critical Thinking Questions
You are called to a home for a child who has ingested an unknown quantity of paint thinner. What are the immediate risks, and what specific advice would you give to the caregivers prior to your arrival?
A conscious adult patient has intentionally ingested a large number of ibuprofen tablets. What are the expected signs and symptoms, and what level of care is generally indicated in the prehospital setting?
Describe the progression of acetaminophen toxicity and explain why early identification and transport are crucial, even if the patient initially appears asymptomatic.
In cases of suspected overdose involving household products, why is it critical to contact Poison Control early in the assessment process?
You find a patient with altered mental status and a history of chronic pain medication use. What considerations should guide your assessment for potential toxic ingestions beyond the immediately obvious, such as assessing the scene for clues?