depends how you're billing. if you just bill for placement (base units plus time units while you're in the room), you don't need ongoing documentation. You can also bill one unit per hour for the entire time the thing is in, but you then need to document pain scores (I believe every hour). For most groups, it's not worth the extra manpower to see every patient every hour for the extra units. We did do it in residency, but there we had multiple residents/CRNAs to round on the patients hourly.