Data source
death
The objective of the randomized clinical trial was to test the efficacy of a CPI system in reducing both interface pressures and the risk of developing pressure injuries [After informed consent was received in our study, a research nurse or assistant set up the ForeSite PT™ system on the patient’s hospital bed. The mattress cover was placed between the bed linen and mattress with the monitor mounted at the head of the bed. The ForeSite PT™ system was removed after 72 h of data collection or prior to this if the enrolled patient withdrew consent, died, was transferred to another unit/hospital, or was discharged from the hospital. Upon removal of the system, the interface pressure readings were downloaded in compressed Microsoft Office InfoPath 2003™ XML Form Template (XSN) formats. The files were then decompressed and converted to comma-separated values (CSV) files using the XSENSOR® Pressure Exposure Analyzer software. Detailed information about the clinical trial can be found in the published protocol [To preserve the integrity of the clinical trial, for this paper we only utilized data from four study participants who did not complete the full 72 h and were not included in the primary trial analyses being done (i.e., analyses in which only individuals who completed the 72-h intervention are included). Patients who did not complete the 72-h intervention because either there was a planned transfer to another unit within 72 h of enrollment, the patient slept in a chair at night, medical status would have been negatively impacted if turned or repositioned or the patient received either palliative or end-of-life care (with death imminent). These data were used to explore how to pre-process pressure data before these analyses. The four patients provided CPI data ranging from 29 to 52 h in duration. The data size ranged from 2.7 to 4.9 GB for each study participant.