Abstract 104: Impact of Resting Between Cycles on CPR Chest Compression Performance
Aim of the Study: Several studies have indicated dramatic decrease in CPR chest compression depth after one minute of performance, potentially effecing clinical outcomes. This trial investigated if compression depth could be maintained if rescuers were allowed to rest between cycles of chest compressions as well as investigating how much rest a rescuer needs to maintain compression performance.
Methods: Volunteers were recruited by announcements in Exercise Science classes. Some had been exposed to CPR via television, others had no exposure. A PAR-Q was administered and excluded those who would be at a higher risk of injury or illness by participating. Each subject was advised of a standard set of instructions based on their “calling” 911 for assistance. The subjects were advised to “Place the heel of one hand in the middle of the chest, approximately at the mid-nipple line. Place the other hand on top of the first hand, interlocking the fingers. Press down trying to compress the breastbone approximately two inches down at a rate of about 100 times per minute. Push hard, push fast, until help arrives.” The subjects were not told how long they were expected to continue compressions, but were advised to stop if they were exhausted or suffering pain. A Laerdal CPR Recording Resusci-Annie (Stavanger,Norway) was used to evaluate compression depth and rate. Each subject performed compressions for one minute and then rested for one minute in cycles until five minutes of chest compressions were performed or the subject stopped due to fatigue or pain.
Results: Average compression depth per minute performing compressions was 32 mm, 31 mm, 31 mm, 31 mm, and 30 mm.
Conclusion: While there was no improvement in compression depth with rest intervals, the depth stayed relatively consistent without the significant dropoff as seen in previous studies. In addition, the subjects reported no fatigue at the end of five minutes and the ability to continue if necessary. This indicates that a one minute rest interval between compressions is enough for the rescuer to again perform compressions at their previous level.
- © 2010 by American Heart Association, Inc.