Investigation On Application Of Transesophageal Echocardiography On Cardiopulmonary Resuscitation

Objective:To investigate the application value of transesophageal echocardiography(TEE) on cardiopulmonary resuscitation(CPR).Methods:The data of 48 patients with cardiac arrest who underwent CPR with Thumper model 1007 cardiopulmonary resuscitator in the Department of Emergency from September 2005 to October 2008 were analyzed retrospectively.23 cases diagnosed and treated with cardiac compression with the assistance of TEE were assigned to the treatment group whereas the other 25 cases without the use of TEE were in the contrast group. The two groups were then compared with respect to the successful rescue rate and the correct diagnosis rate of the suspected patients with cardiovascular diseases.Analyze the changes of cardiac structure and hemodynamics caused by external cardiac massage and the relationship of compression depth and cardiac output.Results:the successful rescue rate and the correct diagnosis rate of the suspected patients with cardiovascular diseases in treatment group were significantly higher than those in contrast group(P＜0.05,P＜0.05).The compression depths were 3cm,4cm,5cm,the stroke volumes,respectively, were 19.42±4.03ml,27.44±3.97ml,33.42±4.76ml(F=39.69,P＜0.01, 3cm VS 4cm:q=7.23,P＜0.01,5cm VS 4cm:q=5.39,P＜0.01,3cm VS 5cm:q=12.61,P＜0.01).The stroke volume was at its maximum when the compression depth was 5cm.The application of TEE in CPR provided the evidence of the changes of cardiac structure and hemodynamics in support of the cardiac pump theory of CPR. Conclusions:TEE is of great application value to the diagnosis and rescue of patients treated with cardiopulmonary resuscitation.The observations favor the cardiac pump theory as the predominant hemodynamic mechanism of forward blood flow in the process of early CPR.Under the same compression frequency,the cardiac output is determined by the compression depth.The deeper the compression depth,the larger the cardiac output is.