A nurse in an emergency department is caring for a client who is experiencing severe dyspnea and wheezing following a bee sting. After administering epinephrine, the client is still experiencing manifestations. Which of the following medications should the nurse plan to administer?

Anaphylaxis is a severe type I hypersensitivity reaction characterized by systemic mast cell degranulation and bronchoconstriction. While epinephrine is the first-line treatment for its vasopressor and bronchodilatory effects, refractory respiratory distress requires secondary interventions to stabilize the airway. Targeted beta-2 agonists are used to provide localized relief of bronchospasm. Rationale: A. Selegiline is a monoamine oxidase inhibitor (MAOI) used primarily in the management of Parkinson's disease. It has no role in the acute treatment of anaphylaxis or respiratory distress. Administering an MAOI in an emergency setting could actually lead to dangerous drug interactions with the epinephrine already given, potentially triggering a hypertensive crisis or cardiac arrhythmia. B. Abatacept is a selective costimulation modulator used for the treatment of rheumatoid arthritis by inhibiting T-cell activation. It is a maintenance medication for chronic autoimmune conditions and does not provide the rapid bronchodilation required for an acute allergic emergency. Its onset of action is far too slow to address the immediate threat of airway occlusion following a bee sting. C. Sucralfate is a gastroprotective agent that forms a complex over ulcer sites in the stomach. It is administered orally and has no systemic effect on the respiratory or cardiovascular systems. Using sucralfate in a client with severe dyspnea is inappropriate and dangerous, as the patient is at high risk for aspiration and requires immediate parenteral or inhaled interventions. D. Albuterol is a rapid-acting beta-2 adrenergic agonist that provides direct bronchodilation to relieve the wheezing and airway constriction associated with anaphylaxis. When a client has a suboptimal response to epinephrine, inhaled albuterol helps to further relax the smooth muscles of the bronchioles. This is a critical secondary intervention to improve ventilation and reduce the work of breathing.