Final answer:
The first thing you should do if you find a patient collapsed on the floor is to assess the scene before proceeding further.
Step-by-step explanation:
The first thing you should do if you walk into a room and find a patient collapsed on the floor is to assess the scene before going any further. This is important to ensure your own safety and the safety of others. By assessing the scene, you can identify any potential hazards or dangers that may be present, such as fire or electrical hazards.
Once you have assessed the scene and ensured it is safe, you can then approach the patient and start the assessment. This may include checking for responsiveness, calling for help, and administering first aid or CPR if necessary.