Chemical exposure
A streamlined, differential-led presentation for rapid clinical review.
Twenty-second review
- Chemicals can cause local corrosive injury, pulmonary irritation, systemic absorption, cellular toxicity, or delayed organ damage through skin, eye, inhaled, or ingested routes.
- Airway symptoms, eye injury, hypoxia, shock, seizure, corrosive pain, or ongoing contamination requires immediate hazardous-material precautions.
- Keep allergic reaction or infection in the differential; overlapping or concurrent illness remains possible.
- For chemical exposure, trends and combinations of findings are more informative than one isolated vital sign.
Compare the clinical patterns
The repeated material is grouped inside each possibility. Open only the condition you need.
CorrosiveTime-sensitive high-risk possibility
HPI
Clarify substance and route; scene decontamination complete; time and duration.
Signs & symptoms
Airway edema, bronchospasm, shock, dysrhythmia, seizure, or delayed lung injury.
Focused exam
Expose appropriately, assess core temperature when available, inspect skin, and look for trauma or multisystem involvement; Reassess after decontamination, warming, cooling, or oxygen support.
Brief pathophysiology
Corrosive may cause chemical exposure through a time-sensitive process capable of rapid physiological deterioration.
What the trend may show
Environmental illness is defined by exposure plus physiology. Temperature, heart rate, pressure, and respiratory rate help grade systemic effect and response to removal or treatment.
Temperature (°C)
High or lowUse an appropriate measurement method for the suspected exposure.
Heart rate (bpm)
May rise or fallRate varies with temperature, dehydration, toxicity, and severity.
Blood pressure (mmHg)
May fallHypotension suggests dehydration, vasodilation, or advanced illness.
Respiratory rate (breaths/min)
May rise or fallRespiratory response depends on temperature, inhalation injury, and metabolic state.
Front-load in the triage report
- Corrosive: Airway edema, bronchospasm, shock, dysrhythmia, seizure, or delayed lung injury.
- Substance and route?
- Scene decontamination complete?
Systemic poisoningTime-sensitive high-risk possibility
HPI
Clarify scene decontamination complete; time and duration; airway, eye or skin symptoms.
Signs & symptoms
Airway edema, bronchospasm, shock, dysrhythmia, seizure, or delayed lung injury.
Focused exam
Reassess after decontamination, warming, cooling, or oxygen support; Identify substance and safety data, route and duration; inspect exposed skin and eyes, airway, lungs, neurologic status, and contamination.
Brief pathophysiology
Systemic poisoning may cause chemical exposure through a time-sensitive process capable of rapid physiological deterioration.
What the trend may show
Environmental illness is defined by exposure plus physiology. Temperature, heart rate, pressure, and respiratory rate help grade systemic effect and response to removal or treatment.
Temperature (°C)
High or lowUse an appropriate measurement method for the suspected exposure.
Heart rate (bpm)
May rise or fallRate varies with temperature, dehydration, toxicity, and severity.
Blood pressure (mmHg)
May fallHypotension suggests dehydration, vasodilation, or advanced illness.
Respiratory rate (breaths/min)
May rise or fallRespiratory response depends on temperature, inhalation injury, and metabolic state.
Front-load in the triage report
- Systemic poisoning: Airway edema, bronchospasm, shock, dysrhythmia, seizure, or delayed lung injury.
- Scene decontamination complete?
- Time and duration?
Local irritant exposureCommon presentation pattern
HPI
Clarify substance and route; scene decontamination complete; time and duration.
Signs & symptoms
Burning, tearing, cough, or dermatitis may predominate after limited exposure.
Focused exam
Expose appropriately, assess core temperature when available, inspect skin, and look for trauma or multisystem involvement; Reassess after decontamination, warming, cooling, or oxygen support.
Brief pathophysiology
Local irritant exposure may explain the presenting symptoms through a common clinical mechanism, while serial assessment checks for complications or an alternate cause.
What the trend may show
Environmental illness is defined by exposure plus physiology. Temperature, heart rate, pressure, and respiratory rate help grade systemic effect and response to removal or treatment.
Temperature (°C)
High or lowUse an appropriate measurement method for the suspected exposure.
Heart rate (bpm)
May rise or fallRate varies with temperature, dehydration, toxicity, and severity.
Blood pressure (mmHg)
May fallHypotension suggests dehydration, vasodilation, or advanced illness.
Respiratory rate (breaths/min)
May rise or fallRespiratory response depends on temperature, inhalation injury, and metabolic state.
Front-load in the triage report
- Burning, tearing, cough, or dermatitis may predominate after limited exposure.
- Substance and route?
- Scene decontamination complete?
Allergic reactionImportant alternative presentation
HPI
Clarify substance and route; scene decontamination complete; time and duration.
Signs & symptoms
Similar skin or respiratory symptoms can occur without toxic exposure.
Focused exam
Expose appropriately, assess core temperature when available, inspect skin, and look for trauma or multisystem involvement; Reassess after decontamination, warming, cooling, or oxygen support.
Brief pathophysiology
Allergic reaction can resemble chemical exposure through overlapping symptoms or referred physiology despite a different primary mechanism.
What the trend may show
Environmental illness is defined by exposure plus physiology. Temperature, heart rate, pressure, and respiratory rate help grade systemic effect and response to removal or treatment.
Temperature (°C)
High or lowUse an appropriate measurement method for the suspected exposure.
Heart rate (bpm)
May rise or fallRate varies with temperature, dehydration, toxicity, and severity.
Blood pressure (mmHg)
May fallHypotension suggests dehydration, vasodilation, or advanced illness.
Respiratory rate (breaths/min)
May rise or fallRespiratory response depends on temperature, inhalation injury, and metabolic state.
Front-load in the triage report
- Similar skin or respiratory symptoms can occur without toxic exposure.
- Substance and route?
- Scene decontamination complete?
InfectionImportant alternative presentation
HPI
Clarify scene decontamination complete; time and duration; airway, eye or skin symptoms.
Signs & symptoms
Similar skin or respiratory symptoms can occur without toxic exposure.
Focused exam
Reassess after decontamination, warming, cooling, or oxygen support; Identify substance and safety data, route and duration; inspect exposed skin and eyes, airway, lungs, neurologic status, and contamination.
Brief pathophysiology
Infection can resemble chemical exposure through overlapping symptoms or referred physiology despite a different primary mechanism.
What the trend may show
Environmental illness is defined by exposure plus physiology. Temperature, heart rate, pressure, and respiratory rate help grade systemic effect and response to removal or treatment.
Temperature (°C)
High or lowUse an appropriate measurement method for the suspected exposure.
Heart rate (bpm)
May rise or fallRate varies with temperature, dehydration, toxicity, and severity.
Blood pressure (mmHg)
May fallHypotension suggests dehydration, vasodilation, or advanced illness.
Respiratory rate (breaths/min)
May rise or fallRespiratory response depends on temperature, inhalation injury, and metabolic state.
Front-load in the triage report
- Similar skin or respiratory symptoms can occur without toxic exposure.
- Scene decontamination complete?
- Time and duration?
Findings that should escalate concern
- Airway injury
- Ocular burn
- Systemic toxicity
- Secondary contamination
- Airway symptoms, eye injury, hypoxia, shock, seizure, corrosive pain, or ongoing contamination requires immediate hazardous-material precautions.
- Corrosive or systemic poisoning: Airway edema, bronchospasm, shock, dysrhythmia, seizure, or delayed lung injury.
Continue the clinical pathway
Clinical and academic sources
Curated clinical guidance and peer-reviewed evidence supporting this presentation. Current BCEHS guidance, medical direction, and local policy remain authoritative for practice.
BCEHS Handbook — specific CPGs
Supporting clinical and academic evidence
- CEDIS Presenting Complaint List updateCanadian Association of Emergency Physicians
Presenting-complaint terminology and categorization context. It does not establish a prehospital “top 100” ranking.
- Clinical Practice Guideline SummariesWilderness Medical Society
Evidence-based guidance for environmental and wilderness emergencies, including heat, cold, altitude, and drowning.
- Chemical eye injury: pathophysiology, assessment and managementEye · 2020
Immediate decontamination and irrigation principles, exposure assessment, and time-sensitive chemical injury care.