Choking / airway foreign body
A streamlined, differential-led presentation for rapid clinical review.
Twenty-second review
- A foreign body can partially or completely obstruct the upper airway, causing ineffective ventilation, rapid hypoxia, bradycardia, and cardiac arrest if not relieved.
- Inability to speak or cough, silent attempts to breathe, cyanosis, decreasing LOC, or complete obstruction requires immediate intervention.
- Keep anaphylaxis or infection-related stridor in the differential; overlapping or concurrent illness remains possible.
- For choking / airway foreign body, 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.
Complete obstructionTime-sensitive high-risk possibility
HPI
Clarify complete or partial obstruction; object/food; initially able to speak/cough.
Signs & symptoms
Silent airflow, collapse, persistent cough, unilateral findings, or hypoxia.
Focused exam
Observe position, speech, accessory-muscle use, pattern, depth, and chest symmetry; Auscultate all lung fields and reassess after movement or treatment.
Brief pathophysiology
Complete obstruction may cause choking / airway foreign body through a time-sensitive process capable of rapid physiological deterioration.
What the trend may show
Airway sounds, voice, work of breathing, and trajectory are more important than a single normal SpO₂. Deteriorating effort or rate may indicate fatigue, not improvement.
Respiratory rate (breaths/min)
Usually rises firstTachypnea and increased effort commonly precede late respiratory failure.
Oxygen saturation (SpO₂)
May fall lateOxygen saturation can remain normal until obstruction becomes severe.
Heart rate (bpm)
Often risesTachycardia may reflect hypoxia, distress, or compensatory response.
Blood pressure (mmHg)
Usually preservedHypotension suggests advanced hypoxia, anaphylaxis, or another shock state.
Front-load in the triage report
- Complete obstruction: Silent airflow, collapse, persistent cough, unilateral findings, or hypoxia.
- Complete or partial obstruction?
- Object/food.
AspirationTime-sensitive high-risk possibility
HPI
Clarify object/food; initially able to speak/cough; loc.
Signs & symptoms
Silent airflow, collapse, persistent cough, unilateral findings, or hypoxia.
Focused exam
Auscultate all lung fields and reassess after movement or treatment; Determine effective cough and air movement; inspect only visible material and reassess breath sounds and swallowing after relief.
Brief pathophysiology
Aspiration may cause choking / airway foreign body through a time-sensitive process capable of rapid physiological deterioration.
What the trend may show
Respiratory infection may impair oxygenation and trigger systemic illness. Older or immunocompromised patients may lack fever, so trend all four observations and mental status.
Respiratory rate (breaths/min)
Often risesTachypnea can be an early marker of respiratory or systemic illness.
Oxygen saturation (SpO₂)
May fallParenchymal disease can impair gas exchange; compare with baseline.
Temperature (°C)
May rise or fallFever is common, but normal or low temperature does not exclude serious infection.
Heart rate (bpm)
Often risesTachycardia may reflect fever, hypoxia, dehydration, or sepsis.
Front-load in the triage report
- Aspiration: Silent airflow, collapse, persistent cough, unilateral findings, or hypoxia.
- Object/food.
- Initially able to speak/cough?
Partial foreign-body obstructionCommon presentation pattern
HPI
Clarify complete or partial obstruction; object/food; initially able to speak/cough.
Signs & symptoms
Effective cough and some airflow may be present.
Focused exam
Observe position, speech, accessory-muscle use, pattern, depth, and chest symmetry; Auscultate all lung fields and reassess after movement or treatment.
Brief pathophysiology
Partial foreign-body obstruction 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
Airway sounds, voice, work of breathing, and trajectory are more important than a single normal SpO₂. Deteriorating effort or rate may indicate fatigue, not improvement.
Respiratory rate (breaths/min)
Usually rises firstTachypnea and increased effort commonly precede late respiratory failure.
Oxygen saturation (SpO₂)
May fall lateOxygen saturation can remain normal until obstruction becomes severe.
Heart rate (bpm)
Often risesTachycardia may reflect hypoxia, distress, or compensatory response.
Blood pressure (mmHg)
Usually preservedHypotension suggests advanced hypoxia, anaphylaxis, or another shock state.
Front-load in the triage report
- Effective cough and some airflow may be present.
- Complete or partial obstruction?
- Object/food.
AnaphylaxisImportant alternative presentation
HPI
Clarify complete or partial obstruction; object/food; initially able to speak/cough.
Signs & symptoms
Swelling or inflammatory narrowing can mimic foreign-body obstruction.
Focused exam
Observe position, speech, accessory-muscle use, pattern, depth, and chest symmetry; Auscultate all lung fields and reassess after movement or treatment.
Brief pathophysiology
Anaphylaxis can resemble choking / airway foreign body through overlapping symptoms or referred physiology despite a different primary mechanism.
What the trend may show
Anaphylaxis may involve airway, breathing, or circulation alone or in combination. Do not wait for hypotension, hypoxemia, or skin findings before recognizing a severe reaction.
Blood pressure (mmHg)
May fallVasodilation and capillary leak can cause rapid hypotension.
Heart rate (bpm)
Often risesTachycardia may accompany shock, distress, or epinephrine treatment.
Respiratory rate (breaths/min)
Often risesTachypnea may reflect bronchospasm, airway edema, or shock.
Oxygen saturation (SpO₂)
May fallDesaturation suggests significant respiratory involvement but may be late.
Front-load in the triage report
- Swelling or inflammatory narrowing can mimic foreign-body obstruction.
- Complete or partial obstruction?
- Object/food.
Infection-related stridorImportant alternative presentation
HPI
Clarify object/food; initially able to speak/cough; loc.
Signs & symptoms
Swelling or inflammatory narrowing can mimic foreign-body obstruction.
Focused exam
Auscultate all lung fields and reassess after movement or treatment; Determine effective cough and air movement; inspect only visible material and reassess breath sounds and swallowing after relief.
Brief pathophysiology
Infection-related stridor can resemble choking / airway foreign body through overlapping symptoms or referred physiology despite a different primary mechanism.
What the trend may show
Airway sounds, voice, work of breathing, and trajectory are more important than a single normal SpO₂. Deteriorating effort or rate may indicate fatigue, not improvement.
Respiratory rate (breaths/min)
Usually rises firstTachypnea and increased effort commonly precede late respiratory failure.
Oxygen saturation (SpO₂)
May fall lateOxygen saturation can remain normal until obstruction becomes severe.
Heart rate (bpm)
Often risesTachycardia may reflect hypoxia, distress, or compensatory response.
Blood pressure (mmHg)
Usually preservedHypotension suggests advanced hypoxia, anaphylaxis, or another shock state.
Front-load in the triage report
- Swelling or inflammatory narrowing can mimic foreign-body obstruction.
- Object/food.
- Initially able to speak/cough?
Findings that should escalate concern
- Inability to speak or cough, silent attempts to breathe, cyanosis, decreasing LOC, or complete obstruction requires immediate intervention.
- Complete obstruction or aspiration: Silent airflow, collapse, persistent cough, unilateral findings, or hypoxia.
Medication recognition
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.
- Guideline for oxygen use in adults in healthcare and emergency settingsBritish Thoracic Society
Peer-reviewed guidance for oxygen assessment, targets, delivery, and monitoring in acute illness.
- Evaluation and Management of Airway Foreign Bodies in the Emergency Department SettingJournal of Emergency Medicine · 2023
Recognition and management of partial or complete foreign-body airway obstruction.