Which of the following outcomes might indicate a serious asthma attack?

A gray-blue or ashen skin tone is a significant indicator of a serious asthma attack. This coloration suggests a lack of adequate oxygen reaching the body's tissues, which can occur during a severe asthma episode due to constricted airways and difficulty breathing. In healthy individuals, skin typically maintains a normal color due to proper oxygenation. When someone experiences changes in skin color, especially to gray or blue, it points to critical oxygen deprivation, necessitating immediate medical attention.

On the other hand, feeling relaxed and increased energy levels are not consistent with a serious asthma attack, as these conditions are typically associated with well-controlled asthma or a state of calmness, which would not be present during an asthma crisis. Additionally, a complete absence of symptoms might suggest that asthma is well-managed, rather than indicating an acute attack. Understanding the signs of a serious asthma attack is essential for timely intervention and could be life-saving.