Are there any requirements that have to be met by the topic? I did my paper for medic class on hyponatremia. Some other ideas: education in EMS, urban vs rural EMS (differences, similarities, etc), any specific condition that interests you and you want to know more about.
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In the very category you posted in, which consisted of only 6 pages of old threads, I saw many, many good ideas for a paper.
If you read through the other threads, I am sure many more will jump out at ya.