Upon arriving at a scene with a seizure patient, what should be your first action when CPR is in progress?

In the context of a patient experiencing a seizure and CPR already being in progress, the first action should be to verify the pulse. This is essential because determining whether the patient has a pulse will guide the next steps in managing their care. If there is no pulse, it confirms the need for uninterrupted CPR to maintain circulation and oxygenation. On the other hand, if a pulse is present, it would indicate that CPR may not be necessary at that moment, and the focus could shift to stabilizing the patient.

Application of the AED is crucial if the patient is in cardiac arrest; however, this action is appropriate only after assessing the pulse and determining that continuous CPR is required. Similarly, applying oxygen can be vital, but it typically follows pulse verification to assess the patient's overall status. Taking over compressions could be necessary, but ensuring the patient’s status regarding circulation through pulse verification is the top priority when CPR is underway. Therefore, verifying the pulse aligns with established protocols for managing a patient during critical care, making it the most appropriate first action in this scenario.