title: The effect of hydraulic bed movement on the quality of chest compressions.
abstract: OBJECTIVE
  The hydraulic height control systems of hospital beds provide convenience and shock absorption. However, movements in a hydraulic bed may reduce the effectiveness of chest compressions. This study investigated the effects of hydraulic bed movement on chest compressions.
  
  
  METHODS
  Twenty-eight participants were recruited for this study. All participants performed chest compressions for 2min on a manikin and three surfaces: the floor (Day 1), a firm plywood bed (Day 2), and a hydraulic bed (Day 3). We considered 28 participants of Day 1 as control and each 28 participants of Day 2 and Day 3 as study subjects. The compression rates, depths, and good compression ratios (>5-cm compressions/all compressions) were compared between the three surfaces.
  
  
  RESULTS
  When we compared the three surfaces, we did not detect a significant difference in the speed of chest compressions (p=0.582). However, significantly lower values were observed on the hydraulic bed in terms of compression depth (p=0.001) and the good compression ratio (p=0.003) compared to floor compressions. When we compared the plywood and hydraulic beds, we did not detect significant differences in compression depth (p=0.351) and the good compression ratio (p=0.391).
  
  
  CONCLUSIONS
  These results indicate that the movements in our hydraulic bed were associated with a non-statistically significant trend towards lower-quality chest compressions.
authors.affiliation: Department of Emergency Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea. Electronic address: mreal.park@pusan.ac.kr.
authors.forename: Maeng Real
authors.initials: MR
authors.lastname: Park
authors.affiliation: Department of Emergency Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
authors.forename: Dae Sup
authors.initials: DS
authors.lastname: Lee
authors.affiliation: Department of Emergency Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
authors.forename: Yong
authors.initials: Y
authors.lastname: In Kim
authors.affiliation: Department of Emergency Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
authors.forename: Ji Ho
authors.initials: JH
authors.lastname: Ryu
authors.affiliation: Department of Emergency Medicine, Pusan National University Hospital, Busan, Republic of Korea.
authors.forename: Young Mo
authors.initials: YM
authors.lastname: Cho
authors.affiliation: Department of Emergency Medicine, Pusan National University Hospital, Busan, Republic of Korea.
authors.forename: Hyung Bin
authors.initials: HB
authors.lastname: Kim
authors.affiliation: Department of Emergency Medicine, Pusan National University Hospital, Busan, Republic of Korea.
authors.forename: Seok Ran
authors.initials: SR
authors.lastname: Yeom
authors.affiliation: Department of Emergency Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea. Electronic address: broadman@hanmail.net.
authors.forename: Mun Ki
authors.initials: MK
authors.lastname: Min
mesh_terms: D000328:Adult; D001513:Beds; D016887:Cardiopulmonary Resuscitation / Q000379:methods*; D018592:Cross-Over Studies; D004632:Emergency Medical Services / Q000379:methods; D005260:Female; D006336:Heart Massage / Q000379:methods*; D006801:Humans; D008297:Male; D008348:Manikins; D010043:Outcome and Process Assessment, Health Care; D011312:Pressure; D056910:Republic of Korea; D055815:Young Adult