At present the work of automatization of the processes of the ECG analysis for diagnosing myocardial infarction with the help of computer technique is going forward on an ever broader scale. For an automatic identification of the focal changes syndrome on the ECG, which in the clinical practice is considered to be tantanount to myocardial infarction, the use of a special diagnostic device (SDD) is proposed. The SDD are comparatively cheap and simple in operation. The process of diagnosing provides for utilization of medical experience, but, at the same time, eliminates shortcomings inherent in systems that reproduce the physicians' manipulations in establishing the diagnosis of myocardial infarction with the help of an electrocardiogram. The choice of the SDD was made by stimulating it with an all-purpose computer. The results of clinical trials of the SDD conducted at specialized clinics bear proof to great possibilities of the automatic electrocardiographic diagnostics.