Abstract
Purpose of the study: Chest compressions generate blood flow by directly squeezing the heart between the sternum and the spine. In the flexible rib cage much force will be diverted laterally. Force could be concentrated by limiting the lateral deformation of the chest wall allowing improved forward blood flow. Conversely, limiting lateral chest wall movement could represent “lateral leaning”, where increased right atrial pressure (RAP) would lead to decreased coronary perfusion pressure (CPP). We studied the effect on hemodynamics with piston based mechanical chest compressions with or without lateral support in a randomized, cross-over animal experiment.
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