What is the most critical complication of anaphylactic shock in an adolescent client that the nurse should detect early?

Laryngeal edema is the most critical complication of anaphylactic shock because it can lead to airway obstruction, which is a life-threatening emergency. In anaphylactic reactions, swelling of the larynx can progress rapidly, compromising the airway and respiratory function. Early detection of laryngeal edema is crucial for timely intervention, such as the administration of epinephrine or securing the airway, to prevent respiratory failure.

While urticaria, tachycardia, and restlessness are signs that may be present during an anaphylactic reaction, they do not pose an immediate threat to life in the same way laryngeal edema does. Urticaria refers to hives and is uncomfortable but not life-threatening. Tachycardia is a compensatory response to the anaphylaxis but does not indicate an immediate risk of collapse like airway compromise does. Restlessness may indicate anxiety or discomfort but does not directly correlate with a critical complication requiring urgent action. Thus, focusing on early detection of laryngeal edema is essential in managing an adolescent client experiencing anaphylactic shock.