Choking Emergency in Children: Foreign Body Airway Obstruction Algorithm

Foreign body aspiration is one of the most time-critical emergencies in childhood and one of the most common causes of preventable death in infants and toddlers. Peanuts, grapes, small toy parts, coins, or carrots – the list of aspirated objects is long and often mundane. What makes choking emergencies so dangerous: children's airways are anatomically narrow, compensatory reserves are minimal, and the time between partial and complete obstruction can be a matter of seconds. For you as a healthcare professional, this means: you need to know the algorithm, reliably differentiate between mild and severe obstruction, and be able to recall age-dependent interventions reflexively.

Anatomical Characteristics of the Pediatric Airway

Before diving into the algorithm, it's worth taking a brief look at the anatomical features that make the pediatric airway system particularly vulnerable:

• Narrowest point: In infants and toddlers, the narrowest point is subglottic at the level of the cricoid cartilage (as opposed to adults, where the glottis represents the narrowest point).
• Proportionally large tongue: The tongue is significantly larger relative to the oral cavity and can rapidly obstruct the upper airway in unconscious patients.
• Short trachea: In infants, the trachea measures only about 4 cm – a foreign body can quickly slip into a main bronchus.
• Small airway diameter: Just 1 mm of mucosal swelling reduces the airway diameter in infants by up to 44% (Poiseuille's law: resistance increases by the fourth power with reduction in radius).
• High oxygen consumption: Children have twice the oxygen consumption per kilogram of body weight compared to adults. Hypoxia tolerance is correspondingly lower.

These factors explain why a choking emergency in children can escalate particularly rapidly and why immediate, structured action is essential.

Mild vs. Severe Obstruction: The Critical Distinction

The entire algorithm hinges on the initial assessment: is there a mild or severe airway obstruction? This differentiation is the first and most important clinical decision point.

Mild Obstruction (Effective Cough)

• The child is coughing forcefully and repeatedly
• The child can speak, cry, or vocalize
• The child can inhale (audible inspiration before coughing)
• The child is conscious and responding appropriately

Your approach for mild obstruction:

1. Encourage coughing – actively and repeatedly
2. Do not perform back blows or the Heimlich maneuver
3. Continuous monitoring – deterioration can occur at any time
4. Do not leave the child alone
5. If there is no improvement or deterioration occurs: immediately switch to the severe obstruction algorithm

Important: An effective cough generates higher intrathoracic pressures than any external intervention. As long as the child is coughing effectively, coughing is the best therapy. Invasive interventions during mild obstruction carry the risk of displacing the foreign body deeper.

Severe Obstruction (Ineffective Cough)

• No cough or only a weak, quiet cough without effect
• Inability to speak, cry, or vocalize
• No audible airflow
• Inspiratory stridor or complete silence
• Progressive cyanosis
• Decreasing level of consciousness

As soon as you identify a severe obstruction, you must act immediately – in an age-dependent manner.

The Foreign Body Algorithm According to AHA Guidelines

Algorithm for Infants (< 1 Year) with Severe Obstruction

For infants, back blows and chest compressions are used. The Heimlich maneuver (abdominal thrusts) is contraindicated in infants – the risk of liver or splenic rupture is too high due to anatomical proportions.

Step-by-step approach:

1. Positioning for back blows:

   • Place the infant face-down on your forearm, which rests on your thigh
   • The head points downward (slight head-down position)
   • Support the head by grasping the mandible with your thumb and fingers – do not apply pressure to the soft tissues under the chin
   • Deliver 5 firm back blows with the heel of your hand between the shoulder blades

2. Positioning for chest compressions:

   • Turn the infant onto their back (head still lower than the trunk)
   • Identify the compression point: lower half of the sternum, one finger-breadth above the xiphoid
   • Deliver 5 chest compressions – slower and more forceful than during cardiopulmonary resuscitation, with the goal of generating an artificial cough
   • Use the two-finger technique (index and middle finger)

3. Repeat the cycle:

   • Alternate 5 back blows and 5 chest compressions
   • After each cycle: inspect the mouth – if a foreign body is visible, remove it carefully. No blind finger sweeps! Blind digital exploration can push the foreign body deeper
   • Continue until the foreign body is removed, the child begins to cough or breathe effectively, or the child becomes unconscious

4. If the child becomes unconscious:

   • Immediately begin CPR (infant resuscitation algorithm)
   • Open the airway, look for a visible foreign body
   • With each ventilation attempt: check for chest rise
   • Activate EMS (have someone call) if not already done

Algorithm for Children (≥ 1 Year) with Severe Obstruction

From the first year of life onward, back blows and abdominal thrusts (Heimlich maneuver) are used.

Step-by-step approach:

1. 5 back blows:

   • Stand slightly behind and to the side of the child
   • Lean the child forward so that the upper body is as horizontal as possible
   • Support the chest with one hand
   • Deliver 5 firm blows with the heel of your hand between the shoulder blades

2. 5 abdominal thrusts (Heimlich maneuver):

   • Stand behind the child and encircle them at the level of the upper abdomen
   • Make a fist and place it between the navel and xiphoid (epigastric region)
   • Grasp the fist with your other hand
   • Deliver 5 firm compressions inward and upward (dorsocranially)
   • Each compression should be performed as a distinct movement – not as continuous pressure

3. Repeat the cycle:

   • Alternate 5 back blows and 5 abdominal thrusts
   • After each cycle: brief inspection of the mouth for visible foreign bodies
   • Continue until the foreign body is removed or the child becomes unconscious

4. If the child becomes unconscious:

   • Carefully place the child on the floor
   • Immediately begin CPR (30:2 with one rescuer, 15:2 with two professional rescuers)
   • With each airway opening: look for a visible foreign body
   • Activate EMS (have someone call)

Special Case: Obese Child or Pregnant Adolescent

In severely obese children or pregnant adolescents where abdominal thrusts cannot be effectively performed, chest compressions (as in CPR) are used as an alternative to abdominal thrusts instead of the Heimlich maneuver.

Common Errors and Pitfalls

In practice, avoidable errors that can worsen outcomes are repeatedly observed:

• Blind finger sweeps of the mouth: One of the most dangerous reflexes – the finger can push the foreign body deeper and worsen the obstruction. Only remove visible foreign bodies!
• Heimlich maneuver in infants: Abdominal thrusts are contraindicated under one year of age. Confusing them with chest compressions can cause fatal abdominal injuries.
• Too hesitant approach in severe obstruction: Back blows and compressions must be forceful enough to generate an effective increase in intrathoracic pressure. A rib fracture is acceptable in this situation.
• Interventions during mild obstruction: Back blows in an effectively coughing child can negatively alter the foreign body's position.
• Delayed activation of EMS: Emergency services should be called as soon as severe obstruction is suspected – ideally by a second person while you perform interventions.
• Stopping CPR after loss of consciousness: Chest compressions during CPR can dislodge the foreign body. Resuscitation also serves as a foreign body removal measure in this context.

Handover to the Emergency Team

When the emergency team arrives, a structured handover is essential. Use a standardized format (e.g., SBAR or ABCDE-oriented):

• Age of the child
• Suspected or confirmed foreign body (type, size, if known)
• Time of the event
• Progression: mild → severe obstruction? Loss of consciousness? CPR?
• Interventions performed: number of cycles, success or failure
• Current status: consciousness, breathing, cyanosis, SpO₂ (if available)

In-Hospital Continued Care

After successful foreign body removal, further medical evaluation is mandatory – even if the child appears asymptomatic:

• After abdominal thrusts: Rule out intra-abdominal injuries (clinical examination, ultrasound if indicated)
• After chest compressions: Rule out rib fractures, pneumothorax
• Retained foreign body: Chest X-ray (anterior-posterior and lateral), bronchoscopy if indicated
• Mucosal injuries: Particularly with sharp-edged foreign bodies, monitor for swelling and secondary bleeding

Prevention: The Best Therapy

Even though prevention is not the primary focus of your acute medical practice, you should actively address the following points in parent counseling and health education:

• Cut food into age-appropriate sizes (quarter grapes lengthwise, avoid nuts under 4 years of age)
• Keep small toys away from infants and toddlers
• Supervise children while eating – do not let them eat while walking, running, or lying down
• Coins, button batteries, balloons, and pen caps are common aspirated objects
• Make older siblings aware of the danger

Algorithm Summary

For quick reference, here is the algorithm at a glance:

1. Assessment: Severity of Obstruction

Criterion	Mild Obstruction	Severe Obstruction
Cough	Effective, forceful	Ineffective or absent
Speaking/Crying	Possible	Not possible
Breathing	Present	Absent or minimal
Consciousness	Alert	Potentially impaired

2. Interventions for Severe Obstruction (Conscious Child)

Age Group	Intervention 1	Intervention 2	Cycle
Infant (< 1 year)	5 back blows	5 chest compressions	Alternating until success or loss of consciousness
Child (≥ 1 year)	5 back blows	5 abdominal thrusts	Alternating until success or loss of consciousness

3. If unconscious: → Start CPR, activate EMS, look for foreign body with each airway opening.

Practical Training

Foreign body aspiration in children is an emergency that occurs rarely – but when it does, it happens under maximum time pressure with the smallest margin for error. Knowing the algorithms in theory is the foundation. Performing them confidently under stress on a simulation manikin is an entirely different dimension. In the first aid courses offered by Simulation Tirol, you train the age-dependent techniques – back blows, chest compressions, Heimlich maneuver – hands-on with realistic models until the skills become second nature. Because in a real emergency, it's not what you know that counts, but what you can do.