A person experiencing difficulty breathing and expressing fear of a heart attack should have which immediate action taken?

When a person is experiencing difficulty breathing and is fearful of a heart attack, the most appropriate immediate action is to help them loosen any restrictive clothing and prepare to provide CPR if necessary. This action serves multiple purposes. Loosening restrictive clothing can help alleviate any additional pressure on the chest, which may help ease their breathing. Meanwhile, being prepared to administer CPR is crucial, as the individual may experience a cardiac event, and having that readiness can be lifesaving.

This response is comprehensive because it addresses both the immediate physical comfort of the person and the potential need for a more advanced intervention like CPR. Taking these steps can create an environment that allows for better airflow and reduces anxiety, which can further help with their breathing difficulty.