We studied the patients diagnosed with non-trombolized Acute Miocardial Infart that at any moment of their hospital staying presented complications at the Intensive Care Unit of the Military Hospital “Mario Munoz Monroy” of Matanzas, in the period from July 2003 to June 2006. Our universe was composed by 113 patients, characterized according to the forms designed with that purpose. We present our results in statistical charts, using the percentage method, the Chi 2 test and confidential intervale when it was required. As a result we determined that electric complications were the most frequent, and the clinical ones the most lethal, generally presented during the first 24 hours. The cardiogenic shock and the extense anterior Acute Miocardial Infart were the most frequent indexes of bad prognosis. General mortality of the study was 25, 7 %.