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The action the nurse would perform first is to repositioning the patient's head.
The process of establishing a patient's airway is the acting of ensuring all obstruction to the intake of air is removed.
The simplest way of ensuring an open airway in an unconscious patient is to use a head-tilt/chin-lift technique, thereby lifting the tongue from the back of the throat.
The maneuver is performed by tilting the head backwards in unconscious patients, often by applying pressure to the forehead and the chin.
Thus, the action the nurse would perform first is to repositioning the patient's head.
Learn more about establishing a patient's airway here: brainly.com/question/28044755