Abstract 230: Comparing Manual and Mechanical Chest Compression Quality Parameters in 30:2 Mode with Use of a Novel Approach
This study aimed at analyzing the possibility of evaluating the logistic differences between manual chest compressions (M-CC) and mechanical chest compressions (LUCASTM2, (L-CC)) performed by 17 paramedics. CPR in 30:2 was performed with both techniques on a modified Leardal manikin. The modification consisted of two cords placed at a depth of 4.5 cm inside the manikin. These cords were connected to the electrodes on the manikin and then connected to the defibrillation leads of a Life-Pack 12 defibrillator enabling registration of impedance measurements in CODE-STAT. Thus only compressions reaching the set depth (4.5 cm) were recorded as a correct compression. Two scenarios were tested with both M-CC and L-CC; the first was a stationary scenario of 10 min CPR on the floor, the second scenario explored CPR during; two min on the floor, 2 min on the stretcher and during 2 min in the ambulance. Parameters compared were number and length of pauses, frequency and chest compression ratio (correct chest compressions alone in % of time). The first scenario revealed, significant differences regarding pauses that occurred significant more often 32 (26-33) compared to 29 (28-29) (Median (Min-Max)) and lasted longer time (s): 129 (105-155) compared to 110 (104-122) for the M-CC group compared to the L-CC group resulting in a chest compressions ratio, lower in the M-CC group: 79 % (65-87%) compared to L-CC group: 84% (33-89%). This result was due to a significant higher frequency of chest compression in the M-CC group 116 (92-133) compared to 99 (98-110). In the two minutes scenario on the floor no significant differences were found, except regarding frequency, but in the M-CC group significantly fewer chest compressions reached 4.5 cm on the stretcher and due to loading in the ambulance. In conclusion: With only small changes done to a manikin we were able to mimic impedance measurements, including depth, using CODE-STAT. An increased frequency during 30:2 CPR also increases the number of pauses and L-CC gives stricter and fewer pauses during CPR in 30:2 resulting better chest compression ratio.
- © 2011 by American Heart Association, Inc.