After administering a beta agonist to a patient with anaphylaxis, which assessment indicates effective treatment?

Effective treatment after administering a beta agonist for anaphylaxis is reflected in stable and normal respiratory function. A respiratory rate of 16 breaths per minute indicates that the patient is breathing adequately and is within a normal range for adults (12 to 20 breaths per minute). This suggests that the airway is open and the bronchodilation effect of the beta agonist is working, allowing for improved oxygen exchange.

In contrast, other options indicate symptoms of ongoing distress or instability. A peripheral capillary oxygen saturation of 92% can suggest mild hypoxemia and might not represent adequate oxygenation. A pulse rate of 112 beats per minute can indicate tachycardia, which may occur in response to stress or the effects of anaphylaxis, and does not confirm effective treatment. A blood pressure of 80/45 mmHg indicates hypotension, a concerning sign that may require additional intervention even after treatment with a beta agonist. Therefore, a respiratory rate within a normal range is the most direct indicator of effective treatment in this scenario.