Severe vs. mild airway obstruction
The first clinical decision is to classify the obstruction. A responsive adult who can speak, cough forcefully, and maintain good air exchange has a
mild obstruction. This patient cannot do that. His cough is weak and fading, he makes a
high-pitched inspiratory stridor, and his lips are becoming
dusky. Those findings indicate
severe airway obstruction with poor air movement, even though he is still conscious and nodding “yes.”
A weak, ineffective cough, inspiratory stridor, and cyanosis mean the airway is critically narrowed, not simply irritated. Encouraging continued coughing is appropriate only when the cough is strong and air exchange is adequate. Giving water is dangerous because liquid can pool above the obstruction and worsen aspiration. Laying the patient flat and starting chest compressions is reserved for an unresponsive victim, not a responsive one.
Why back blows and abdominal thrusts are paired
In a responsive adult with severe foreign body airway obstruction, the recommended sequence is alternating
5 back blows with
5 abdominal thrusts. The two maneuvers work through different mechanisms. Back blows create a sudden increase in intrathoracic pressure and vibration that can dislodge a foreign body from the upper airway. Abdominal thrusts force the diaphragm upward, rapidly compressing the lungs and generating an artificial cough to expel the object.
Alternating the two techniques increases the chance of dislodging the object because each maneuver produces a different pressure pattern in the airway. The cycle is repeated until the obstruction is relieved or the victim becomes unresponsive. If unresponsiveness develops, the responder lowers the victim to the ground and begins CPR with chest compressions, checking the mouth for a visible object before each set of ventilations.
Watch out! A patient who is still coughing does not automatically have a mild obstruction. The quality of the cough matters more than its presence. A weak, silent cough with stridor and cyanosis is a severe obstruction and requires immediate active intervention, not observation.
Clinical recognition in adults
Foreign body airway obstruction in adults is most often caused by food, especially meat, and frequently occurs during meals. The presentation can be subtle in older adults because the cough reflex may be diminished and the initial choking episode may not be witnessed. A high index of suspicion is needed when an adult suddenly stops speaking, grasps the throat, or develops respiratory distress while eating.
| Feature | Mild obstruction | Severe obstruction |
|---|
| Cough | Strong, effective | Weak, ineffective, or absent |
| Speech | Able to speak | Unable to speak, may only nod |
| Breath sounds | Wheezing possible, good air movement | High-pitched stridor, poor air movement |
| Color | Pink | Dusky or cyanotic |
| Nursing action | Encourage coughing, observe closely | Back blows and abdominal thrusts immediately |
Key point! The universal choking sign—clutching the throat—plus a weak cough, stridor, and cyanosis is a severe airway emergency. Do not delay intervention to obtain equipment or wait for the patient to improve on his own.
Immediate nursing actions
The nurse should stand behind the patient, support the chest with one hand, and deliver five sharp back blows between the shoulder blades with the heel of the other hand. If the obstruction persists, the nurse performs five abdominal thrusts by placing a fist just above the umbilicus, grasping it with the other hand, and pressing inward and upward with quick thrusts. The sequence continues until the object is expelled or the patient loses consciousness.
Once the patient becomes unresponsive, the protocol changes: lower him to the floor, activate the emergency response system, and begin CPR starting with chest compressions. Before each ventilation attempt, the rescuer opens the mouth and looks for a visible foreign body, removing it only if it is clearly seen. Blind finger sweeps are avoided because they can push the object deeper.
In a hospital setting, the nurse should also call for help early so that advanced airway equipment and a crash cart are available. However, calling for help does not replace immediate manual maneuvers. The back blow–abdominal thrust cycle is the first-line intervention for a responsive adult with severe obstruction, and it should begin without delay.