Document Detail

Effects of compression-to-ventilation ratio on compression force and rescuer fatigue during cardiopulmonary resuscitation.
MedLine Citation:
PMID:  20825932     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Although increasing consecutive compressions during cardiopulmonary resuscitation (CPR) is beneficial to patients, it possibly affects the workload and, ultimately, the quality of CPR. This study examines the effects of compression-to-ventilation ratio on external chest compression performance of rescuers. METHODS: Subjects were 17 health care providers. Each participant performed CPR with 3 compression-to-ventilation ratios: 15:2, 30:2, and 50:5. The duration of CPR was 5 minutes in each group, with a rest period of 50 minutes in between. The manikin was equipped with a 6-axis force load cell to measure the force applied. An 8-camera digital motion analysis system was used to collect the 3-dimensional trajectory information. Data were compared using the crossover design. Ratings of perceived exertion and body area discomfort were measured. RESULTS: The mean compression forces (in Newtons) delivered at 1 minute 20 seconds to 1 minute 40 seconds and at 4 minutes 20 seconds to 4 minutes 40 seconds were 494.65 ± 53.58 and 478.64 ± 50.29, respectively (P = .047), for compression-to-ventilation ratios of 15:2; 473.57 ± 49.69 and 435.59 ± 56.79, respectively (P < .001), for ratios of 30:2; and 468.44 ± 38.05 and 442.18 ± 43.40, respectively (P = .012), for ratio of 50:5. Diminished compression force in the ratio 50:5 was observed at 1 minute 20 seconds, and in the 30:2 ratio, it was observed at 4 minutes 20 seconds. The mean joint angles in each group did not differ significantly between 1 minute 20 seconds and 4 minutes 20 seconds. The Ratings of Perceived Exertion Scale was 3.38 ± 1.64 in 15:2, 4.06 ± 1.43 in 30:2, and 4.35 ± 1.54 in 50:5 (P = .045). Waist discomfort was noted in 50:5 after 4 minutes 20 seconds of external chest compression. CONCLUSIONS: Rescuer fatigue must be considered when raising the consecutive compression during CPR. Switching the compressor every 2 minutes should be followed where possible.
Chih-Hsien Chi; Jui-Yi Tsou; Fong-Chin Su
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-03-26
Journal Detail:
Title:  The American journal of emergency medicine     Volume:  28     ISSN:  1532-8171     ISO Abbreviation:  Am J Emerg Med     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-01     Completed Date:  2010-11-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8309942     Medline TA:  Am J Emerg Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1016-23     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Department of Emergency Medicine, National Cheng Kung University, Tainan, Taiwan.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Biomechanics / physiology
Blood Pressure / physiology
Cardiopulmonary Resuscitation / psychology,  statistics & numerical data*
Heart Massage / psychology,  statistics & numerical data*
Heart Rate / physiology
Physical Exertion
Time Factors
Time and Motion Studies

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Diagnosing pediatric appendicitis: usefulness of laboratory markers.
Next Document:  Combination of white blood cell count with liver enzymes in the diagnosis of blunt liver laceration.