J Korean Soc Emerg Med.  2024 Feb;35(1):23-30.

Analysis of chest compression quality according to the metronome setting rate in metronome-assisted cardiopulmonary resuscitation

• Chae HJ
• Cho JH
• Moon JB
• Shin MC
• Park YS
• Ahn WC
• Ohk TG

Abstract

Objective
The 2020 Cardiopulmonary Resuscitation (CPR) guidelines recommend the use of feedback devices during CPR training and do not limit their use in actual CPR. Although there have been various studies on metronome-assisted CPR that use a metronome as a feedback device, there are no research results to determine a specific metronome setting rate. We analyzed the quality of CPR and the effectiveness of the metronome feedback according to the metronome setting rate within the recommended chest compression rate range.
Methods
Fifty healthcare providers who had received CPR training or had performed CPR in the previous 2 years participated, and all of them performed CPR at three rates (100/min, 110/min, and 120/min). The CPR was performed for 2 minutes with only chest compressions. The smartphone metronome (Metronome version 13.0 Android, KHTSXR, Seoul, Korea) application was used for the rate setting, and Resusci Anne QCPR Mk II (Laerdal Medical, Stavanger, Norway) was used to measure the CPR quality. The difference in the CPR quality according to the setting rate was analyzed.
Results
There was no significant difference in the “average compression depth (mm),” “adequate compression depth ratio (%),” and “adequate release ratio (%)” at the three set rates. The “adequate compression rate ratio (%)” was 98.48±5.27% at 110/min, which was higher than that at 120/min or 100/min, and this was a statistically significant difference (P=0.000). There was no significant difference in the “adequate compression site ratio (%).”
Conclusion
When performing metronome-assisted CPR, setting the rate to 110/min can more appropriately maintain the recommended chest compression rate range and can result in high-quality CPR.

Keyword

Cardiopulmonary resuscitation; Feedback device; Metronome