A great number of people suffering from a high blood pressure have episodes of acute asymptomatic myocardial infarction not recognized in time. The disease is discovered by ECG or echocardiographic recording during a routine check up.In the Framingham study one third of all acute myocardial infarctions remained unnoticeable and among those suffering from a high blood pressure that percentage was even higher. In 1999 and 2000 during routine check ups by ECG we diagnosed myocardiall infractionin sub-acute or sub-chronical phase in 20 patients who, between two check ups, had not had any problems.All 20 patients suffered from hypertension, but they did not have diabetes mellitus as a secondary disease.During the same period by echosonography we diagnosed myocardial infraction in 20 patients whose hypertension was treated and who did not have any problems.Incidents of asymptomatic myocardial infraction were more frequent in women suffering for more than 5 years from arterial hypertension of less severe and very severe type.In males, however, we diagnosed cases of mild (medium state) arterial hypertension. Our results confirm, once again, that all types of asymptomatic coronary diseases are very frequent and for their diagnosis and timely treatment it is absolutely necessary to make ECG and ultrasound of the heart 2-3 times a year.