Choking

Anatomy and Physiology

The foreign body lodged in the larynx or trachea is most dangerous as this causes complete airway obstruction. Alternatively, foreign bodies such as small beads or small pieces of food may pass below the vocal cords and become lodged at the carina or within a mainstem bronchus[5]. In adults, due to differences in right versus left pulmonary anatomy, foreign bodies are more commonly retrieved from the right main bronchus. However, children will have equal likelihood in either bronchus, due to equal growth until the age of 16.[6]

Indications

The event may be witness or unwitnessed. A witnessed incident is always diagnostic and facilitates immediate treatment. However, in the cases where the events may be unwitnessed, a high clinical suspicion must be present. Often these patients are unable to verbalize what has happened.

In children, you may appreciate drooling or stridor. The most common presenting symptoms are the classical triad of a paroxysmal cough, wheezing, and dyspnea or decreased air entry/decreased breath sounds in adults. The described “café coronary” refers to cardiac arrest secondary to airway obstruction that occurs while eating rather than a myocardial infarct.

Technique or Treatment

Conscious Children

Infants (children less than 1 year) with foreign body aspiration should be treated with alternating five back blows followed by five chest thrusts. This action is best performed with the infant's torso on the provider's nondominant arm or an older child draped across the knees. After five blows delivered between the scapula, turn the child over and perform five chest thrusts (chest compressions).

The Heimlich maneuver should NOT be used on children younger than 1 year. Additionally, while the blind finger sweep is still included in the advanced cardiovascular life support and basic life support protocols for adult airway management, it should be avoided in the infant age group as it may push the object further into the airway.[7]

Older children (those greater than 1 year) may receive the Heimlich maneuver. Best results are produced when the provider performs it while on the knees. A clenched fist should be placed at the level of the umbilicus and an upward thrust delivered posteriorly and superiorly.

Unconscious Children

The loss of consciousness indicates a loss of perfusion. Check for a pulse and move on to advanced airway tactics including direct laryngoscopy and foreign body retrieval with McGill or ringed forceps. If the object can be seen but not retrieved, percutaneous translaryngeal ventilation may be necessary. If the object cannot be seen and the patient may be ventilated, bronchoscopy may be required. Children under the age of 10 should NOT receive a surgical airway as they do not have fully developed posterior tracheal rings. 

Adults

All adults can and should receive the Heimlich maneuver while they are conscious. If the Heimlich cannot be performed due to body habitus or pregnancy, the American Heart Association recommends a supine patient with force again applied just above the umbilicus in a cephalad posterior vector. If the adult loses consciousness, it is imperative to check for a pulse and begin cardiopulmonary resuscitation if a pulse is not detected. Advanced airway techniques are now indicated, and you may be able to visualize the foreign body under direct laryngoscopy.

Clinical Significance

Parents should be cautioned about the risks of toys with small movable parts that can break off and use caution with regards to coins, balloons, and cylindrical objects[8]. Food should be cut in such a way that reduces risk (i.e., cutting grapes and hot dogs in half). Until a child has molars and has demonstrated a robust ability to chew. Hard foods such as carrots should be avoided.

Adults who have their food prepared by other family members or by caregivers should be given the most permissive and safe diets, which may mean smaller cut pieces or pureed foods. Aspiration risk may be reduced by altering food consistency. If patients experience coughing or choking while eating, drinking or swallowing medications a formal dysphagia screen may be indicated.

Pearls

• At risk are those between ages 0 and 3 and over age 60.
• Leading cause of death among children 1 to 3 years, and the fourth leading cause of unintentional death overall.
• The most common foreign body objects are coins and balloons.
• The most common foreign body foods are hot dogs, grapes, and steak.
• Do not perform the Heimlich maneuver on children less than 1 year.
• Prevention includes parental diligence regarding risky toys, cutting circular foods in half, and pureeing foods or cutting smaller pieces for elderly persons.

Enhancing Healthcare Team Outcomes

Choking events are fairly common in both adults and children. In minutes, they may lead to a fatal outcome. In a hospital setting, best results will be achieved if nurses and clinicians are familiar with methods to rapidly relieve choking and appropriate assistance is provided. Caregivers should work toward educating the public on methods of responding to a choking event. [Level V]