critical care patients

critical care patients. I need to hone down my PICO question for a paper. Here is what I have so far. How can I make it sound better?  Many surgical procedures use catheters during the procedure, but infections are not as high as intensive care units.  (P) Use of indwelling catheters in critical care patients, (I) interventions of protocols used in intensive care units ( C) compared to surgical units (O) reducing hospital-acquired infections