Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Foreign-body aspiration
Paediatrics and child health · UK scope · Sources checked 27 Aug 2026 · Clinical review pending
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Ineffective cough or unconsciousness
A silent child unable to breathe, cry or cough effectively has complete or near-complete foreign-body airway obstruction and can progress to cardiac arrest within minutes.
Action: Shout for help and call emergency services. If conscious, alternate up to 5 back blows with 5 chest thrusts in an infant or 5 abdominal thrusts in a child; reassess after each cycle. If unconscious, open the airway, remove only a clearly visible object, give 5 rescue breaths and start paediatric CPR. Do not perform blind finger sweeps; arrange hospital assessment even after apparent relief.
Overview
Treat complete airway obstruction immediately, recognise partial or occult aspiration after choking, understand that normal examination and radiography do not exclude it, and obtain urgent specialist rigid bronchoscopy when clinical suspicion remains.
Most events occur from 6 months to 3 years as mobility and pincer grasp develop before mature chewing. Nuts, seeds, grapes and food fragments predominate; toys and hardware also occur.
Object position determines presentation. Laryngeal obstruction produces stridor or aphonia, tracheal objects can cause variable bilateral sounds, and a main bronchus object causes unilateral air trapping or collapse.
A ball-valve object permits inspiration but limits expiration, causing distal hyperinflation and mediastinal shift. Complete blockage causes atelectasis and later infection.
History should reconstruct the exact activity, object availability, suddenness, initial cyanosis and whether symptoms ever fully resolved. Ask all caregivers because the event may have been witnessed elsewhere.
Examination is repeated while calm: voice, stridor
Practice
Two practice questions
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Question 1 of 2
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Paediatrics and child healthOriginal SBA
Conscious choking infant
A 9-month-old cannot cry or cough after choking on food but remains conscious. What manoeuvre sequence is recommended?
Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending+
Sources
Sources and review status
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.
, respiratory effort, symmetrical expansion, air entry and focal monophonic wheeze. Normal findings between coughs
do not
exclude aspiration.
Airway manoeuvres generate pressure to expel a proximal object but can move it. Each set is followed by reassessment, and professional help continues even after expulsion.
Rigid bronchoscopy provides airway control, optical diagnosis and strong retrieval instruments. Flexible bronchoscopy has selected diagnostic or distal roles but is not the universal first treatment for a high-risk object.
Delay permits granulation, recurrent infection, bronchiectasis and difficult extraction. A chronic wet cough or same-lobe pneumonia months later can be the first recognised consequence.
Food prevention advice must be specific: quarter grapes lengthwise, cook hard vegetables, avoid coin-shaped sausage pieces and whole nuts, and seat rather than allow running while eating.
Discharge follows specialist confirmation of complete removal or a credible alternative diagnosis, stable breathing and clear return advice.
Key points
With an effective cough, encourage coughing and watch continuously; do not strike a child who can still move air effectively.
With an ineffective cough in a conscious infant, alternate 5 back blows and 5 chest thrusts. In a child older than 1 year, alternate 5 back blows and 5 abdominal thrusts.
If unconscious, begin paediatric basic life support with 5 rescue breaths and CPR. Look in the mouth before breaths and remove only a visible object; never sweep blindly.
After successful emergency manoeuvres, arrange medical assessment for residual object, airway injury and complications, particularly after abdominal thrusts.
Classic partial aspiration is abrupt choking followed by cough, unilateral wheeze or reduced air entry. The initial crisis may settle while the object remains.
First-line stable investigation is inspiratory chest radiography; add expiratory views in a cooperative child or bilateral decubitus views in a young child to reveal unilateral air trapping.
Radiography can be normal because nuts, food and plastic are radiolucent. Do not use normal imaging to overrule a compelling history or focal examination.
Reference standard and definitive treatment for suspected central airway foreign body is rigid bronchoscopy by an experienced paediatric airway team, with anaesthesia and retrieval equipment prepared.
Aetiology
01
Developmental choking risk
Young children explore orally and lack mature molar grinding and coordinated protective responses for hard round food.
02
Hazardous object geometry
Nuts, grapes, popcorn, sausage rounds and small toy parts fit the paediatric airway and may be radiolucent.
03
Impaired swallowing or supervision
Neurological disease, eating while running or laughing and inaccessible supervision increase aspiration risk across ages. within the child-specific clinical phenotype.
Pathophysiology
1
Complete proximal obstruction
A laryngeal or tracheal object prevents effective ventilation, causing rapid hypoxaemia, unconsciousness and cardiac arrest. during progression of the respiratory disorder.
2
Ball-valve air trapping
Partial bronchial obstruction admits inspiratory air but blocks expiration, producing unilateral hyperinflation and possible mediastinal shift.
3
Distal collapse
Complete bronchial occlusion allows absorbed gas to reduce volume, causing atelectasis and impaired regional ventilation. during progression of the respiratory disorder.
4
Chronic inflammatory injury
Retained material causes oedema, granulation, infection and structural bronchial damage that complicates delayed extraction. during progression of the respiratory disorder.
Clinical features and red flags
Witnessed event
Record food or object, activity, choking, cyanosis, interventions, expulsion and persistent symptoms afterward.
Upper-airway signs
Assess voice, stridor, drooling and biphasic noise for laryngeal or tracheal obstruction.
Focal lower-airway signs
Compare expansion, percussion, air entry and monophonic wheeze between sides repeatedly while calm.
Delayed phenotype
Look for chronic cough, fever, focal collapse, abscess or recurrent infection in the same anatomical site.
Object risk
Identify batteries, magnets, sharp parts, nuts and fragmented organic material because urgency and complications differ.
Red flags requiring action
Ineffective or silent cough, inability to cry or speak, cyanosis or reduced consciousness requires the RCUK choking sequence immediately.
Sudden coughing or choking during eating or play with persistent unilateral wheeze or reduced air entry requires urgent bronchoscopy referral.
A normal chest radiograph does not exclude a radiolucent object; convincing history remains decisive.
Stridor
Investigations
01First-line: inspiratory and air-trapping chest radiographsFirst stepFirst line
Why
Find radiopaque material, unilateral hyperinflation, collapse or mediastinal shift in a stable child.
Interpretation and limitations
Normal imaging does not exclude radiolucent aspiration; compare expiratory or decubitus air trapping with the history.
02Reference standard: rigid bronchoscopyReference standard
Why
Directly identify and remove a central airway foreign body while controlling the airway.
Interpretation and limitations
Proceed despite normal radiography when clinical suspicion is high; a complete systematic inspection confirms removal.
03Selected low-dose CT
Why
Clarify stable intermediate-probability cases where CT can change the bronchoscopy decision.
Interpretation and limitations
Use specialist protocols and radiation justification; CT is not an emergency substitute for bronchoscopy.
04Post-removal imaging or bronchoscopy
Why
Assess residual fragments, collapse, air leak or persistent obstruction after a difficult extraction.
Interpretation and limitations
The airway team selects follow-up from object fragmentation, mucosal injury and clinical recovery.
Differential diagnosis
01
Asthma or viral wheeze
Diffuse recurrent wheeze with triggers and bronchodilator response is less focal and less abrupt than aspiration.
02
Croup or anaphylaxis
Bark and viral prodrome favour croup; urticaria, swelling or shock favours anaphylaxis requiring adrenaline. when timing, examination and trajectory are integrated.
03
Pneumonia
Fever and consolidation may be primary infection or a consequence of a retained object, especially in the same lobe.
04
Structural airway lesion
Fixed recurrent monophonic wheeze, vascular ring, stenosis or malacia can imitate persistent foreign-body obstruction. when timing, examination and trajectory are integrated.
Additional chapter-specific clues
Effective versus ineffective cough
Decide immediately whether the child can vocalise and move air because this determines emergency manoeuvres.
Management
01Effective coughEncourage and observeFirst stepA choking child remains able to cough loudly and breathe.+
1Encourage coughing and keep the child under continuous observation.
2Do not give blind sweeps, drinks or back blows while cough remains effective.
3EscalationEscalate immediately to the ineffective-cough sequence if sound or airflow falls.
1Give up to 5 back blows and check after each attempt.
2Give 5 chest thrusts in an infant or 5 abdominal thrusts in a child and alternate cycles.
3Call emergency help and transition to paediatric BLS if consciousness is lost.
Complications
01
Hypoxic arrest
Complete obstruction rapidly causes cerebral hypoxia, cardiac arrest and death without immediate effective manoeuvres. when recognition or effective treatment is delayed.
02
Pneumonia and bronchiectasis
Retained objects impair drainage, causing recurrent infection, abscess and permanent bronchial dilatation. when recognition or effective treatment is delayed.
03
Air leak or mucosal injury
Obstruction, pressure manoeuvres and extraction can cause pneumothorax, bleeding, oedema or perforation. when recognition or effective treatment is delayed.
04
Migration
A partially mobile object can shift from one bronchus to the trachea and suddenly produce complete obstruction.
Monitoring and follow-up
After emergency relief, monitor voice, stridor, work, saturation and focal air entry for residual or migrated material.
Observe for injury after chest or abdominal thrusts and document every manoeuvre.
Keep nil by mouth and prepare fasting and anaesthetic information when bronchoscopy is likely.
After extraction, monitor bleeding, laryngeal oedema, pneumothorax, fever and persistent asymmetry.
Confirm all fragments are accounted for, especially with nuts or brittle plastic.
Review delayed pneumonia until clinical and radiographic collapse resolves where indicated.
Give caregivers specific choking prevention and first-aid education.
Special situations
Normal imaging does not reassure
Most food objects are radiolucent; the history of sudden choking may carry more diagnostic weight than the film.
Do not treat an effective cough
Pressure manoeuvres can move a partially obstructing object, so encourage cough until it becomes ineffective.
The crisis can have two phases
Initial dramatic choking may settle after the object enters a bronchus, leaving deceptively mild focal symptoms.
Bronchoscopy diagnoses and treats
Rigid instrumentation provides ventilation, complete airway inspection and strong retrieval capability in one controlled procedure.
Same-lobe pneumonia is a clue
Recurrent focal infection should reopen the history for a missed choking event rather than prompt endless antibiotics.
Common pitfalls
01
Do not perform back blows while cough remains effective.
02
Do not perform blind finger sweeps.
03
Do not use abdominal thrusts in an infant.
04
Do not assume apparent expulsion means the airway is clear.
05
Do not exclude aspiration with a normal radiograph.
06
Do not delay bronchoscopy for CT when clinical suspicion is high.
07
Do not treat persistent focal wheeze as asthma indefinitely.
08
Do not give food or drink when urgent anaesthesia is likely.
CT may reduce negative bronchoscopy in selected stable diagnostically uncertain cases, but must not delay bronchoscopy when suspicion is high or obstruction is unstable.
Do not offer food or drink when bronchoscopy is likely. Keep the child calm, monitor closely and involve ENT or paediatric respiratory and anaesthesia early.
Antibiotics and bronchodilators may temporarily change secondary symptoms but do not remove the object. Persistent focal wheeze should not be labelled asthma.
Prevent aspiration through age-safe food preparation, seated supervised eating, keeping small objects and button batteries inaccessible and avoiding whole nuts under 5 years.
, voice change or biphasic noise suggests a laryngeal or tracheal object capable of sudden complete obstruction.
Persistent cough, fever, focal collapse or recurrent same-lobe pneumonia after an unwitnessed event suggests retained foreign body.
Button battery, sharp object or caustic material in the aerodigestive tract requires immediate specialist localisation and removal.
05Microbiology in delayed infection
Why
Guide antibiotics when retained aspiration has caused pneumonia, abscess or bronchiectasis.
Interpretation and limitations
Antibiotic treatment accompanies removal and does not make bronchoscopy unnecessary.
03UnconsciousStart paediatric life supportThe obstructed child becomes unresponsive during the choking event.+
1Open the airway, remove only a clearly visible object and attempt 5 rescue breaths.
2Begin chest compressions and the paediatric BLS sequence with emergency services activated.
3Reinspect only for visible material before breaths; never perform blind finger sweeps.
04Stable aspirationRefer for definitive bronchoscopyDefinitiveChoking history or focal signs persist after the immediate crisis.+
1Keep nil by mouth, monitor and obtain appropriate inspiratory and air-trapping radiographs.
2Discuss urgently with the paediatric airway team even if radiography is normal.
3Perform rigid bronchoscopy when suspicion is high and manage infection or air leak after complete removal.