Phase 1 symptoms: which of the following best describes Phase 1?

Phase 1 symptoms: which of the following best describes Phase 1?

• A. Fever and productive cough
• B. Wheezing with no cough
• C. Coughing, wheezing, and hypoxemia
• D. Rash

Answer: (C)

Phase 1 is characterized by initial lower-airway involvement where the airways are inflamed and constricted, leading to bronchospasm. Coughing reflects the airway irritation, while wheezing comes from turbulent airflow through narrowed bronchioles. Hypoxemia shows that gas exchange is starting to be impaired due to this airway obstruction and possible mucous plugging, indicating the lungs aren’t delivering oxygen as efficiently yet. The other options don’t fit this early airway picture: fever with a productive cough points more toward pneumonia with alveolar involvement; wheezing without a cough is less typical of an early airway phase; and a rash suggests a non-respiratory or systemic process rather than an initial lower-respiratory phase.

Phase 1 is characterized by initial lower-airway involvement where the airways are inflamed and constricted, leading to bronchospasm. Coughing reflects the airway irritation, while wheezing comes from turbulent airflow through narrowed bronchioles. Hypoxemia shows that gas exchange is starting to be impaired due to this airway obstruction and possible mucous plugging, indicating the lungs aren’t delivering oxygen as efficiently yet. The other options don’t fit this early airway picture: fever with a productive cough points more toward pneumonia with alveolar involvement; wheezing without a cough is less typical of an early airway phase; and a rash suggests a non-respiratory or systemic process rather than an initial lower-respiratory phase.