Kim YW, et al. - Among 20 patients (aged > 18 years) with non-traumatic cardiac arrest who received cardiopulmonary resuscitation (CPR), researchers focused on the dynamics of chest compressions. For this purpose, they analyzed movement of the right ventricular free wall excursion during CPR. They performed transesophageal echocardiography during CPR, as well as M-mode tracing at the maximal compression area of the right ventricular free wall. Based on findings, adequate compression depth during CPR nay be achieved via maintaining high compression velocity.