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Review Question - QID 214614

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QID 214614 (Type "214614" in App Search)
A 16-year-old girl is brought to the emergency department by ambulance after she attempted suicide by overdosing on her grandfather's pills. Her parents say that they do not know what the medication is but know that it is for his "heart problems." On presentation, she is found to be dyspneic with audible wheezing. Her temperature is 98°F (36.6°C), blood pressure is 85/47 mmHg, pulse is 42/min, and respirations are 23/min. What is the mechanism of action of the first-line treatment for this patient's condition?