The nurse is preparing to administer a dose of acetylcysteine. Which of the following are indications for this drug? Select all that apply

A. Mucolysis: Acetylcysteine acts as a mucolytic by breaking disulfide bonds within mucoproteins, thereby decreasing the viscosity and adhesiveness of respiratory secretions. This facilitates expectoration in conditions characterized by thick mucus, such as chronic bronchitis or cystic fibrosis. By improving airway clearance, it reduces the risk of secretion retention. B. Acetaminophen Overdose: Acetylcysteine is the antidote for acetaminophen toxicity because it replenishes hepatic glutathione stores. Glutathione is required to detoxify the toxic metabolite N-acetyl-p-benzoquinone imine (NAPQI), which accumulates when normal metabolic pathways are saturated. Early administration limits hepatocellular injury and reduces the risk of acute liver failure. C. Eosinophilic Asthma: Eosinophilic asthma is primarily an inflammatory condition driven by type 2 immune responses and elevated eosinophils. Management involves inhaled corticosteroids, biologics targeting interleukins, and bronchodilators. Acetylcysteine does not address the underlying inflammatory pathway characteristic of this asthma phenotype. D. Hyperthyroidism: Hyperthyroidism results from excessive thyroid hormone production and is managed with antithyroid medications, beta-blockers, radioactive iodine, or surgery. Acetylcysteine has no pharmacologic effect on thyroid hormone synthesis, secretion, or peripheral conversion. It does not influence thyroid gland activity or systemic metabolic rate. E. Seasonal Allergies: Seasonal allergic rhinitis is mediated by IgE-triggered histamine release from mast cells. Standard treatment includes antihistamines, intranasal corticosteroids, and leukotriene modifiers. Acetylcysteine does not block histamine receptors or modify allergic immune responses.