A Novel Method for Delivery of an Appropriate Rate of Ventilation During Cardiopulmonary Resuscitation with a Placement of Advanced airway: Setting a Compression Numbers to Ventilation Ratio

Lee, Chang Hoon; Lee, Kyeong Ryong; Baek, Kwang Je; Hong, Dae Young; Jung, Ho Sung; Kim, Sang Chul; Park, Sang O

Abstract

PURPOSE
Hyperventilation during cardiopulmonary resuscitation (CPR) is common and can be detrimental to survival. We designed a method for delivery of an appropriate rate of ventilation during CPR by setting a compression numbers to ventilation ratio.
METHODS
We conducted a virtual simulation trial using 12 randomly sorted actual CPR video files. Participants provided ventilation using a self-inflating bag while watching one minute of CPR video clips utilizing pre-set compression to ventilation ratios of 10:1, 12:1, and 15:1, respectively. Ventilation rates per minute were manually calculated and analyzed.
RESULTS
Eight medical doctors and eight emergency medical technician students were included. Among the three groups, significant different mean (S.D) ventilation rate per min (compression to ventilation ratio were 10:1, 12:1, and 15:1) was (9.9 (1.3) vs. 8.8 (1.0) vs. 7.2 (0.8), respectively; p<0.0001). Proportion of the number of appropriately delivered ventilations was 62.5%, 89.6%, and 38.0% for compression to ventilation ratios of 10:1, 12:1, and 15:1, respectively (p<0.0001).
CONCLUSION
Compression to ventilation ratio of 12:1 resulted in a significantly appropriate ventilation rate, compared with the ratio of 10:1 or 15:1. Pre-set compression to ventilation ratio of 12:1 seems to be a novel method for delivery of an appropriate number of ventilations during CPR after establishment of an advanced airway.