The nurse admits a patient with a history of asthma who is wheezing, has severe shortness of breath, hypoxia, and feeling anxious. Which pathophysiological changes explain the patient's manifestations?

Choice A rationale Asthma is an obstructive disease characterized by inflammation and hyper-responsiveness of the airways. While some medications cause relaxation, the pathophysiology of an acute attack involves the constriction (spasm) of the bronchial smooth muscle, increased mucus production, and airway edema, leading to obstruction, not muscle relaxation and dry membranes. Choice B rationale The core pathophysiology of an acute asthma exacerbation is the hyper-responsiveness of the airways to triggers, leading to bronchial smooth muscle constriction (bronchospasm) and airway edema with excessive mucus. This combination severely narrows the airways, causing air trapping on exhalation, resulting in wheezing, shortness of breath, and hypoxia. Choice C rationale Acute pulmonary edema is the excessive fluid accumulation in the lung interstitium and alveoli, most commonly due to left-sided heart failure (cardiogenic) or severe lung injury (non-cardiogenic, e.g., ARDS). While both cause shortness of breath and hypoxia, pulmonary edema's primary mechanism is fluid leakage, distinct from the bronchospasm and airway inflammation central to asthma. Choice D rationale The elastic fibers of the lung parenchyma, primarily composed of elastin, are crucial for passive exhalation and recoil of the lung. While lung elasticity can be compromised in conditions like emphysema (loss of elasticity) or pulmonary fibrosis (increased stiffness), the acute symptoms of asthma are predominantly due to obstruction from smooth muscle contraction and inflammation, not this specific mechanism.