Inhaled object lodged in the upper or lower airway; pediatric peak at 1-3 years, adult risk with altered consciousness.
Also known as: foreign body aspiration, airway foreign body, choking, pediatric aspiration
Overview
Inadvertent inhalation of solid material into the upper or lower respiratory tract. Manifestations depend on the location (laryngotracheal versus bronchial) and the degree of obstruction (complete versus partial).
Epidemiology
Predominantly a pediatric condition with peak incidence between 1 and 3 years. Approximately 80% of pediatric cases involve children under 3 years; food items (peanuts, seeds, hot dog pieces) and small toys are the most common objects. Adult aspiration occurs in patients with neurologic impairment, sedation, alcohol intoxication, dental procedures, or trauma; the right mainstem bronchus is the most common destination due to its more vertical orientation and wider lumen (in standing adults).
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Question 1PulmonaryEasy
A 2-year-old boy presents to the emergency department after a sudden coughing and choking episode while eating peanuts. On arrival he has decreased breath sounds and wheezing localized to the right lung. Chest radiograph shows right-sided hyperinflation on expiratory view with mediastinal shift to the left. Rigid bronchoscopy confirms a peanut fragment lodged in the right main bronchus. Which of the following is the most likely complication if the foreign body is not promptly removed?
ABronchial stenosis
BPost-obstructive pneumonia
CPulmonary arterial hypertension
DSpontaneous pneumothorax
EAspiration pneumonitis
Reveal answer & full explanation
Correct answer: B — Post-obstructive pneumonia
ABronchial stenosis
BPost-obstructive pneumonia✓
CPulmonary arterial hypertension
DSpontaneous pneumothorax
EAspiration pneumonitis
Why Post-obstructive pneumonia is correct
A retained airway foreign body causes mucus stasis, impaired clearance, and bacterial colonization distal to the obstruction, leading to post-obstructive pneumonia
Chronic retention can progress to bronchiectasis or lung abscess
This is the most common and likely complication of a retained airway foreign body
Why the others are wrong
Pulmonary arterial hypertension — requires chronic widespread hypoxic vasoconstriction or vascular remodeling; would not develop from a single lobar foreign body in the acute or subacute time frame
Spontaneous pneumothorax — can occur with severe air trapping but is uncommon compared to post-obstructive infection, and would typically present with sudden worsening rather than as the dominant chronic sequela
Bronchial stenosis — granulation tissue around a retained foreign body can eventually narrow the bronchus, but that is a late sequela of weeks to months of retention; infection distal to the obstruction develops far sooner and is more common
Aspiration pneumonitis — the word aspiration makes chemical pneumonitis tempting, but aspiration pneumonitis is acute lung injury from inhaled acidic gastric contents, usually in a patient with depressed consciousness, and it is not a consequence of leaving a solid object in the airway; a peanut lodged in a bronchus causes mechanical obstruction, and retention leads to infection distal to the blockage
Additional high-yield points
This child has a classic foreign body aspiration with a bronchial peanut causing ball-valve obstruction, distal air trapping, and unilateral hyperinflation
Definitive treatment is prompt removal via rigid bronchoscopy
Question 2PulmonaryEasy
A 3-year-old child has sudden coughing and unilateral wheezing after playing with peanuts. Chest radiograph shows air trapping on the right. Which of the following is the most appropriate diagnostic and therapeutic procedure?
AFlexible bronchoscopy now
BAbdominal thrusts now
CRigid bronchoscopy now
DDirect laryngoscopy now
ENebulized albuterol trial
Reveal answer & full explanation
Correct answer: C — Rigid bronchoscopy now
AFlexible bronchoscopy now
BAbdominal thrusts now
CRigid bronchoscopy now✓
DDirect laryngoscopy now
ENebulized albuterol trial
Why Rigid bronchoscopy now is correct
Abrupt cough, unilateral wheeze, and unilateral air trapping after a peanut are classic for an aspirated airway foreign body.
Rigid bronchoscopy secures and ventilates the airway while large forceps extract the object, making it both diagnostic and therapeutic.
It is the procedure of choice in children precisely because it controls the airway if the object fragments.
Why the others are wrong
Flexible bronchoscopy now — The flexible scope can locate an object but lacks the working channel and airway control to safely retrieve a bulky pediatric foreign body; picking it is a right-procedure-wrong-instrument trap.
Direct laryngoscopy now — Laryngoscopy with Magill forceps retrieves supraglottic and pharyngeal objects, but the unilateral air trapping localizes this peanut to a bronchus far distal to its reach.
Nebulized albuterol trial — Bronchodilators relieve bronchospasm, not a fixed intraluminal object; anchoring on the wheeze only delays the extraction the lead-in asks for.
Abdominal thrusts now — the choking first-aid maneuver is reserved for severe obstruction in a child who cannot cough, speak, or breathe; this child is coughing and moving air, and the unilateral air trapping places the peanut in a bronchus, where thrusts neither confirm nor reliably remove it.
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Edentulous and elderly patients aspirating dental appliances or food boluses
Pathophysiology
Complete airway obstruction at the larynx or trachea causes immediate asphyxia and is rapidly fatal without intervention. Partial obstruction permits airflow but with stridor or wheezing. Bronchial impaction creates a one-way valve — air enters during inspiration (radial bronchial dilation) and trapping occurs on expiration, producing hyperinflation distal to the obstruction. Long-standing foreign bodies cause granulation tissue, post-obstructive pneumonia, bronchiectasis, and atelectasis.
Clinical presentation
Symptoms
Sudden choking, coughing, gagging, or stridor during eating or playing (witnessed in only 30-40% of pediatric cases)
Silent interval may follow, leading to delayed presentation days to weeks later
Expiratory wheeze or rhonchi (intrathoracic — bronchial location), often focal/unilateral
Decreased breath sounds over the affected lung
Cyanosis and respiratory distress with significant obstruction
Universal choking sign (hands at throat) in conscious adults
Classic findings
Toddler with sudden cough and unilateral wheeze; inspiratory and expiratory CXR with air trapping that fails to deflate on the affected side.
Differential diagnosis
Asthma exacerbation — Diffuse wheezing rather than focal; history of atopy; bronchodilator-responsive
Croup — Viral prodrome, barking cough, inspiratory stridor, steeple sign on neck X-ray; ages 6 months-3 years
Epiglottitis — High fever, drooling, toxic appearance, tripod position, thumb sign on lateral neck X-ray
Bacterial tracheitis — Toxic appearance with high fever after viral URI; copious purulent secretions
Anaphylaxis — Urticaria, angioedema, hypotension, respiratory distress after exposure; responds to epinephrine
Retropharyngeal abscess — Fever, neck pain, dysphagia, drooling; widened prevertebral soft tissue on lateral neck film
Recurrent pneumonia in same lobe — Consider chronic foreign body if recurrent same-segment pneumonia
Diagnostic workup
Labs
Not diagnostic; obtain pre-procedure labs (CBC, type and screen, coagulation studies) before rigid bronchoscopy
Imaging
Most aspirated foreign bodies are RADIOLUCENT (organic material, plastic) — a normal CXR DOES NOT exclude aspiration
Inspiratory AND expiratory chest radiographs (or lateral decubitus films in young children): air trapping with mediastinal shift away from the affected lung on expiration is highly suggestive
Lateral neck X-ray for suspected upper airway foreign body
Chest CT in stable patients with high clinical suspicion and equivocal radiographs
Rigid bronchoscopy is both diagnostic and therapeutic for confirmed or strongly suspected cases — do not delay for advanced imaging when clinical certainty is high
Treatment
First-line
Complete airway obstruction (cannot speak, cough, or breathe) — IMMEDIATE intervention per BLS/PALS:
Adults and children 1 year and older: repeated cycles of 5 back blows followed by 5 abdominal thrusts (Heimlich maneuver) until the object is expelled or the patient becomes unresponsive (AHA 2025)
Infants <1 year: alternating 5 back blows and 5 chest thrusts (NEVER abdominal thrusts in infants)
Unresponsive patient: begin CPR, check mouth for visible foreign body during compressions, attempt to remove only if seen
Direct laryngoscopy with Magill forceps for supraglottic objects
Rigid bronchoscopy under general anesthesia is the GOLD STANDARD for bronchial foreign body retrieval — flexible bronchoscopy is reasonable in adults and at experienced pediatric centers
Post-removal: bronchoscopic suctioning, evaluation for retained fragments, consider short course of corticosteroid if significant edema
Button battery ingestion or aspiration
EMERGENCY — caustic mucosal injury within 2 hours, perforation within hours
Immediate rigid bronchoscopy or esophagoscopy regardless of symptoms
Suspected ingestion only (never for a battery in the airway): honey 10 mL every 10 min (up to 6 doses) for children 12 months and older within 12 hours of ingestion, en route to the ED or while awaiting removal (National Capital Poison Center, ESPGHAN 2021); it must never delay emergent endoscopic removal
Magnet aspiration or ingestion (especially multiple)
High risk of pressure necrosis, perforation, fistula
Immediate endoscopic removal; surgical exploration if perforation suspected
Chronic retained foreign body
Rigid or flexible bronchoscopy for removal
Treat post-obstructive pneumonia (amoxicillin-clavulanate, ampicillin-sulbactam, or alternative based on local sensitivities)
Assess for bronchiectasis after resolution
Complications
Asphyxia, hypoxic brain injury, death
Post-obstructive pneumonia (the most common complication of a retained bronchial foreign body), empyema
Bronchiectasis, chronic atelectasis
Mucosal granulation tissue and bronchial stenosis
Pneumothorax, pneumomediastinum (procedural or from forced expiration against obstruction)
A normal chest X-ray does NOT rule out foreign body aspiration — most pediatric objects are radiolucent.
Unilateral wheeze of acute onset in a toddler = foreign body aspiration until proven otherwise.
Rigid bronchoscopy under general anesthesia in the operating room is the gold standard for pediatric retrieval.
Right mainstem bronchus is the most common destination in standing adults; in supine patients the posterior segments of the upper lobes and superior segments of the lower lobes are favored.
Button batteries are a true emergency — caustic injury occurs within 2 hours, and outcomes are time-dependent.
References
ESPGHAN 2021 — Mubarak A, Benninga MA, Broekaert I, et al. Diagnosis, Management, and Prevention of Button Battery Ingestion in Childhood: A European Society for Paediatric Gastroenterology Hepatology and Nutrition Position Paper. J Pediatr Gastroenterol Nutr 2021;73(1):129-136
AHA 2025 — Kleinman ME et al. Part 7: Adult Basic Life Support: 2025 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation 2025;152(16 Suppl 2):S448-S478; Joyner BL et al. Part 6: Pediatric Basic Life Support: 2025 American Heart Association and American Academy of Pediatrics Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. Circulation 2025;152(16 Suppl 2):S424-S447
J Thorac Dis 2017 — Hewlett JC, Rickman OB, Lentz RJ, Prakash UB, Maldonado F. Foreign body aspiration in adult airways: therapeutic approach. J Thorac Dis 2017;9(9):3398-3409
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