Which of the following describes a typical respiratory pattern associated with cystic fibrosis?

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Exertional breathlessness is common in cystic fibrosis because thick, sticky mucus plugs the airways, causing chronic obstruction and impaired gas exchange. As people with CF try to exercise or perform ordinary activities, their oxygen demand rises but airway flow is limited, so they experience dyspnea with exertion. This exercise intolerance reflects the reduced pulmonary reserve that develops over time with ongoing mucus plugging, inflammation, and bronchiectasis.

Tachypnea can occur, especially during distress, but it’s not as defining a pattern for CF as exertional breathlessness. Pursed-lip breathing is a compensatory technique seen in various obstructive conditions to help with expiration, not a feature unique to CF. Accessory muscle use signals increased work of breathing during acute episodes or severe disease, rather than a typical pattern seen during more stable CF. Thus, dyspnea on exertion best captures the common respiratory pattern in CF.