What is the first step in assessing a casualty’s circulation?

In the context of assessing a casualty's circulation, the first step is to identify and address any immediate threats to life, such as significant non-pulsating hemorrhage. This is critical because severe hemorrhage can quickly lead to shock and potentially fatal complications if not managed promptly. By prioritizing the control of major bleeding, you take decisive action to stabilize the casualty's circulation before proceeding to check the pulse rate or other assessments.

Once significant hemorrhage is managed, further evaluation can be carried out, including pulse checks and looking for additional signs of circulatory compromise. However, addressing life-threatening conditions takes precedence to ensure the best chance of survival for the casualty.