Spirometry is a helpful objective measure of airflow limitation; it depends on the patient's ability to properly perform a full, forceful, and prolonged expiratory maneuver. Spirometry is usually feasible in children

Correct Answer: D

Rationale: Spirometry is typically feasible in children aged 6 years and older, as younger children may struggle to perform the required expiratory maneuvers accurately.

Correct Answer: A

Rationale: Cardiogenic shock typically presents with increased central venous pressure due to impaired cardiac output.

Correct Answer: B

Rationale: Irritability is an early sign of shock due to hypoperfusion before hypotension or organ failure develops.

Correct Answer: A

Rationale: Pleural friction rub is usually heard in both inspiratory and expiratory phases. Its presence suggests pleural inflammation, but excessive pleural fluid may mask it.

Correct Answer: A

Rationale: Systemic JIA is associated with a higher risk of developing AA amyloidosis.