[Clinical aspects of differential-diagnostic ECG analysis in practical electrocardiography].

Individual assessment of ECG in any field of medicine requires, in the first place, analysis of clinical findings and, in the second place, the selection of a "specific" complex of symptoms from recorded ECG deviations reflecting cardiopathology proper (hypertrophy of different parts of the heart, a focal process of different layers, the extent and stages of disease development, SA, AV and intraventricular block, a certain type of disturbance of impulse formation, etc.). One should bear in mind the arbitrary concept of specificity of any ECG-syndrome and its components applied specially to differential ECG diagnosis between different processes. When analyzing "nonspecific" ECG shifts one should necessarily consider a degree of reliability of one or another nonspecific sign for objective confirmation of supposed pathology which could probably cause (for clinicoanamnestic reasons) the appearance of this sign.