The effects of Intra-aortic Balloon Pumping (IABP) was studied in 11 dogs following acute coronary occulusion. In clinical studies, 11 cases were adapted it for the various coronary disease after aortocoronary bypass and cardiogenic shock following acute myocardial infarction. 1) The average of ST segment (ST) and total ST segments (ΣST) were used as the magnitude of myocardial injury. These indicies are very useful to estimate for it and showed significant improvement of the ischemic

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... until 2 hours after balloon counterpulsation. 2) Regional myocardial blood flow by Hydrogen gas method was proved to be effective arround the ischemic border zone but little at the ischemic areas. 3) We used IABP in 11 cases of ischemic heart disease but survival rate was very low especially in cardiogenic shock following acute myocardial infarction. Therefore we confirmed that it necessary more effective left ventricular support for the cases.