“…lww.com/SIH/A747). 46,67,74,77,79,[81][82][83]86,89,92,93,96,105,109,138,139 Most studies were on BLS training and generally showed a significant benefit of objective and real-time feedback from feedback devices when compared with no feedback (from device or instructor) or instructor-feedback only (without a feedback device). 67,74,92 Most studies assessed CPR quality immediately after training, but 1 study suggested that real-time audiovisual feedback may improve skill retention at 3 months.…”