What should be the first action for a casualty affected by an angina attack?

In the case of a casualty experiencing an angina attack, the first action should involve assessing their breathing. This step is crucial as it helps determine the severity of the situation and provides vital information about the casualty's condition. An angina attack occurs when the heart muscle is temporarily deprived of oxygen, leading to chest pain. By assessing breathing, you can gauge whether the individual is in distress or requires further assistance.

If their breathing is labored or absent, it may indicate a more serious heart issue, and prompt action may be required. Other options, such as waiting for medical professionals or administering CPR, would come into play only if the situation escalated. Encouraging exercise is inappropriate during an angina attack, as it could worsen the condition. Therefore, assessing breathing serves as a vital first step in ensuring the casualty's safety and determining the next appropriate actions.