“…All 3 studies found that compression rate was more appropriate when auditory guidance was used, although there was a negative impact on compression depth in 1 study. [94][95][96] If feedback devices are not available, auditory guidance (eg, metronome, music) may be considered to improve adherence to recommendations for chest compression rate only (Class IIb, LOE B-R). These recommendations are made, balancing the potential benefit of improved CPR performance with the cost of the use of such devices during training.…”