Which symptom is most indicative of a severe asthma attack?

Shortness of breath at rest is indeed one of the most indicative symptoms of a severe asthma attack. During a severe asthma episode, the airways become significantly inflamed and obstructed, making the patient unable to get enough air even when they are not exerting themselves. This symptom often signifies that the obstruction is severe enough to affect the person's ability to maintain normal respiratory function at rest, rather than only during exertion.

While other symptoms such as wheezing, chest tightness, and a dry cough are commonly associated with asthma and can certainly occur during an episode, shortness of breath at rest reflects a more critical state. This symptom indicates significant airway compromise, and patients experiencing this level of distress may require immediate medical intervention to prevent respiratory failure or other serious complications. Thus, identifying shortness of breath at rest is crucial for assessing the severity of an asthma attack and ensuring appropriate and timely treatment.