“…Fifteen studies involving 297 subjects found no increased risk for adverse events related to PP. 2,3,32,35,36,56,80,81,83,84,90,91,105,115,121 Fifteen other observational studies involving 401 subjects did report an increased risk for adverse events associated with PP. 24,26,27,29 -31,33,82,85-89,92,108 Consistent with the metaanalysis of RCTs, 9,10,13 pressure ulcerations (particularly to the forehead and anterior chest wall) appeared within 24 h of PP.…”