Department of Mechanical and Mechatronic Engineering, University of Stellenbosch, Western Cape Province, South Africa.
Acad Emerg Med. 2011 Nov;18(11):1167-76. doi: 10.1111/j.1553-2712.2011.01213.x.
The objective was to validate an existing theoretical model for the mechanics of constant peak displacement cardiopulmonary resuscitation (CPR) using experimental data taken using various back support surfaces at different chest compression (CC) rates.
A CPR simulator was used to perform constant peak displacement CC on a weighted full-body CPR training manikin supported on surfaces of varying stiffness at different CC rates. The net sternum-to-spine displacement, combined chest and mattress displacement, and axial reaction force were measured during each test. The experimental results were compared to theoretical predictions from the constant peak displacement CPR model.
The theoretical model predictions matched the experimental data to within a mean difference of 11.7% at a CC rate of 42 compressions per minute (cpm), 10.0% at a CC rate of 60 cpm, and 10.1% at a CC rate of 96 cpm, for a target maximum sternal displacement of 5.0 cm. The model predictions also show that when the back support stiffness is less than 250 N/cm, the benefit of using a backboard is greater than for stiffer support surfaces.
Good quantitative agreement between the experimental data and the theoretical model suggests that the constant peak displacement CPR model provides reasonable prediction of CC mechanics during CPR over a wide range of CC rates. Conflicts in the literature are also explained by showing that backboards can significantly enhance CPR CC performance when the back support stiffness is less than 250 N/cm, while for surfaces with higher stiffness, the benefit of using a backboard is reduced.
本研究旨在使用不同背撑表面在不同胸外按压（CC）速率下采集的实验数据，验证恒定峰值位移心肺复苏（CPR）力学的现有理论模型。
使用 CPR 模拟器在不同 CC 速率下对置于不同硬度背撑表面的有重量的全身体模进行恒定峰值位移 CC。在每次测试中测量胸骨-脊柱净位移、胸部和床垫总位移以及轴向反作用力。将实验结果与恒定峰值位移 CPR 模型的理论预测进行比较。
在 CC 速率为 42 次/分钟（cpm）、60 cpm 和 96 cpm 时，理论模型预测与实验数据的平均差异分别为 11.7%、10.0%和 10.1%，目标最大胸骨位移为 5.0 cm。模型预测还表明，当背撑硬度小于 250 N/cm 时，使用背板的益处大于更硬的支撑表面。
实验数据与理论模型之间具有良好的定量一致性，这表明恒定峰值位移 CPR 模型能够在广泛的 CC 速率范围内合理预测 CPR 中的 CC 力学。通过展示背板在背撑硬度小于 250 N/cm 时可显著提高 CPR CC 性能，同时对于硬度更高的表面，使用背板的益处降低，也解释了文献中的矛盾。
