Relationship between chest compression depth and novice rescuer body weight during cardiopulmonary resuscitation.
OBJECTIVE
This study determined if rescuer body weight is a major determinant of chest compression depth (CCD) among novice rescuers by analyzing the results of cardiopulmonary resuscitation (CPR) skill tests among medical students and determined the body weight threshold for those unable to achieve adequate CCD.


METHODS
Retrospective analysis of CPR test results was performed. A total of 107 medical students completed the tests, which included 5 cycles of CPR. Data were collected using a ResusciAnne SkillReporter. Anthropometric data including participant body weight, body mass index, and height were also collected. The relationships between CCD and anthropometric data were evaluated by Pearson correlation coefficient. In addition, univariate linear regression analysis was used to assess the association between body weight and CCD.


RESULTS
The highest positive correlation was found between CCD and body weight (r = 0.636, P < .001). Body weight correlated with CCD by as much as 40.5% (R2= 40.5, P < .001). Using a regression model, we described the association between body weight and CCD as follows: expected CCD (mm) = 0.46 × body weight + 17.59. The regression equation shows that rescuers weighing more than 70.5 kg could achieve a CCD of 50 mm.


CONCLUSIONS
Rescuer body weight is a major determinant of CCD in novice rescuers. Based on these findings, if 2 or more rescuers are available to perform CPR, chest compression should preferentially be performed by rescuers of healthy weight or overweight.
Department of Emergency Medicine, College of Medicine, Chung-Ang University, Seoul, Republic of Korea. Electronic address: jehyeokoh@cau.ac.kr.
Je Hyeok
JH
Oh
Department of Emergency Medicine, College of Medicine, Chung-Ang University, Seoul, Republic of Korea.
Chan Woong
CW
Kim
D000328:Adult; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D016887:Cardiopulmonary Resuscitation / Q000379:methods*; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008348:Manikins; D011312:Pressure; D056910:Republic of Korea; D012189:Retrospective Studies; D013337:Students, Medical; D055815:Young Adult