Which one of the following groups of signs would indicate that a casualty is suffering an asthma attack?

The signs that indicate a casualty is suffering an asthma attack include breathlessness, cyanosis, and wheezing on expiration. During an asthma attack, the airways become inflamed and constricted, leading to difficulty in breathing. As a result, the individual experiences breathlessness due to reduced airflow. Wheezing is a high-pitched sound that occurs during expiration when air tries to pass through these narrowed airways. Cyanosis, a bluish tint to the skin, particularly around the lips and fingertips, indicates that the body is not receiving enough oxygen, which is common during an asthma attack.

Other choices may present symptoms that are commonly associated with different medical conditions. Coughing can occur with various respiratory issues but is not specific to asthma. Facial swelling and rash might suggest an allergic reaction rather than an asthma attack, and symptoms like trembling, drowsiness, and slurred speech may indicate a serious medical condition such as shock or neurological issues, but they are not characteristic of asthma. Recognizing the specific combination of symptoms associated with asthma is crucial for prompt and appropriate management during an attack.