Author: Ho, Sung Hon
Title: Biomechanical effects of body postures in performing cardiopulmonary resuscitation
Advisors: Chow, Hung-kay Daniel (FHSS)
Degree: DHSc
Year: 2018
Subject: Hong Kong Polytechnic University -- Dissertations
CPR (First aid)
Cardiac resuscitation
Department: Faculty of Health and Social Sciences
Pages: 127 pages : color illustrations
Language: English
Abstract: Aim: To study the biomechanical effects of body postures on chest compression in performing cardiopulmonary resuscitation (CPR). Background: Efficiency of chest compression during CPR affected millions of victims over the world, while there are still no specific guidelines on kneeling postures that a rescuer should adopt in performing a proper CPR. Design: A self-controlled, repeated-measures design was applied in this study to measure within subjects and compare the differences among the participants. The biomechanical effects and efficiency of chest compression on a mannequin with three adopted kneeling postures (farthest, self-adjusted, and nearest) were analysed. Methods: Fourteen participants with a qualified first aid certificate were recruited. Each participant had to perform three sessions of CPR, using one of the three different kneeling postures (i.e. farthest, self-adjusted and nearest). They were performed in a random order chosen by drawing lots. Each session consisted of five blocks of CPR in each kneeling posture. Each block consisted of 30 strokes of chest compression performed within 18 seconds with a 4-second pause between consecutive blocks. Each session lasted for 2 minutes. The participants were allowed to rest for 10 minutes on a chair between sessions. Efficiency of chest compression was quantified by compression forces, joint angles, heart rates and energy expenditures. After each session of CPR, the participants were surveyed about their rate of perceived exertion. Results: Efficiency of chest compression in self-adjusted and nearest kneeling postures was found to be significantly better than that of the farthest one. Although the self-adjusted and nearest postures had the similar effect, most of the participants preferred self-adjusted kneeling postures because of lower rate of perceived exertion. Conclusion: The use of the self-adjusted and nearest kneeling postures during CPR resulted in consistent chest compression and extended muscle endurance, compared with the farthest kneeling postures. Both of these positions can thus be objectively recommended to enhance the efficiency of chest compression and thereby increase the cardiac arrest survival rates.
Rights: All rights reserved
Access: restricted access

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