Which finding on exam is considered a red flag sign for an asthma exacerbation?

• A. AMS (hypercapnia)
• B. Fever
• C. Shortness of breath alone
• D. Palpitations

Answer: (A)

The main idea here is recognizing signs that indicate impending respiratory failure in an asthma flare. Altered mental status caused by rising carbon dioxide levels (hypercapnia) is a red flag because it shows the patient isn’t ventilating effectively anymore. When work of breathing is extreme and fatigue sets in, the lungs can’t clear CO2, leading to confusion or drowsiness. That shift from preserved mental status to AMS signals the need for immediate, aggressive escalation of care and airway management. Fever might point toward infection, shortness of breath is a common symptom and not by itself a red flag, and palpitations aren’t specific signs of impending failure. So AMS with hypercapnia correctly flags a dangerous progression in asthma and prompts urgent intervention.