Visualization of cardiac valve motion in man during external chest compression using two-dimensional echocardiography. Implications regarding the mechanism of blood flow.

摘要: Five patients who underwent cardiopulmonary resuscitation (CPR) were studied by two-dimensional echocardiography to assess valve motion. The mitral remained open throughout the entire compression-release cycle of CPR. aortic opened during compression phase CPR and closed release phase. pulmonic moved toward position leaflets release. Tricuspid never completely apposed, even maximum chest compression, they widely Left ventricular dimensions did not change appreciably These findings support theory that forward blood flow depends on a generalized increase in intrathoracic pressure direct heart itself. left appears act as conduit for passage blood, closure is necessary