Incomplete chest wall decompression: a clinical evaluation of CPR performance by EMS personnel and assessment of alternative manual chest compression–decompression techniques☆
Introduction
Complete chest wall decompression during the performance of cardiopulmonary resuscitation (CPR) is recommended in the current American Heart Association (AHA) [1] and European Resuscitation Council [2] guidelines. Complete chest wall recoil improves hemodynamics during CPR by generating relatively negative intrathoracic pressure and thus draws venous blood back to the heart, providing cardiac preload prior to the next chest compression phase [3], [4], [5]. We hypothesized that incomplete decompression during the performance of CPR increases the frequency and duration of positive intrathoracic pressure, inhibiting venous blood return to the right heart and decreasing the hemodynamic effectiveness of CPR. The hemodynamic effects of incomplete chest wall recoil in a porcine model of cardiac arrest are the subject of a companion paper by Yannopoulos et al. in this issue of ‘Resuscitation’ [6].
In this report, we present a two-phased translational research initiative. Phase I was an observational case series to evaluate the quality of CPR performed by emergency medical services (EMS) providers on patients with an out-of-hospital cardiac arrest. Rescuers were observed at some point during resuscitative efforts to maintain residual and continuous pressure on the chest wall during the decompression phase of CPR, thus preventing complete chest wall recoil. This led to the generation of two important questions: (1) Would vital organ perfusion pressure increase if the chest were allowed to fully recoil during CPR?; and (2) Would a change in manual CPR technique improve the likelihood of obtaining full chest wall recoil during CPR? The companion paper by Yannopoulos addresses the first question. Phase II of this study was designed to answer the second question by: (1) assessing the quality of CPR delivered by EMS providers using an electronic recording manikin; and (2) determining if a change in CPR technique would improve complete chest wall recoil, while still maintaining adequate duty cycle, compression depth, and correct hand position placement. Standard manual CPR and three alternative manual CPR approaches were assessed.
Section snippets
Methods—clinical observation study
This study was performed with an exception from informed consent requirements for emergency research (21 section CFR Part 50.24) following community consultation and public notification. It was part of, but unrelated to, another study of a new CPR device for which the Food and Drug Administration had approved an investigational device exemption. The Human Research Review Committee at the Medical College of Wisconsin and seven additional Institutions Research Committees representing 13 receiving
Phase II—manikin study
Following the observational study described above, Milwaukee EMS personnel were retrained in CPR with an emphasis on allowing the chest wall to completely recoil after each compression. However, due to difficulties observed in assuring that there was full chest wall recoil without the aid of some type of force or pressure gauge, alternative hand positions were developed and assessed. This next portion of the study evaluated the hypothesis that it is difficult to perform manual chest
Discussion
Incomplete chest wall decompression (independently observed in clinical practice by research personnel and often appearing to be associated with rescuer fatigue) occurred at some time during resuscitative efforts in 6 (46%) of 13 consecutive cardiac arrests treated by well-trained EMS personnel. Potential causes for the consistently positive (>0 mmHg) airway pressures during the observed compression–decompression cycles include incomplete chest wall decompression, prolonged, positive
Conclusions
Incomplete chest wall decompression was visually observed at some time during resuscitative efforts in 6 (46%) of 13 consecutive adult out-of-hospital cardiac arrests. The Hands-Off Technique decreased compression duty cycle but was 129 times more likely to provide complete chest wall recoil (OR: 129.0; CI: 43.4–382.0) compared to the Standard Hand Position without differences in accuracy of hand placement, depth of compression, or reported increase in fatigue or discomfort with its use. All
Conflict of interest statement
There are no conflicts of interest to disclose that would inappropriately influence or bias this work.
Acknowledgements
The authors gratefully acknowledge the assistance of the following individuals whose enthusiasm and dedication made this project possible:
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Milwaukee County Department of Health and Human Services: Paula Lucey
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Milwaukee County Division of EMS Administration: Patricia Haslbeck, Rosemarie Forster, Michael Milbrath, Lauryl Pukansky, Kenneth Sternig
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Milwaukee County EMS Faculty: Bernadette Barton, Angela Brindowski, Eugene Chin, Kim Krueger, Del Szewczuga
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Milwaukee County EMS Staff: Thomas Duerr,
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A Spanish and Portuguese translated version of the Abstract and Keywords of this article appears at 10.1016/j.resuscitation.2004.10.007.
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