title: [Information value of the changes in the ECG elements during graded physical loading in the diagnosis of ischemic heart disease].
abstract: The authors provide the data obtained on retrospective analysis of 30 ECG recorded in 30 men with coronary heart disease (CHD), confirmed by the clinical and coronarography data, during bicycle ergometry. The amplitude of the R wave in the V5 lead and the total amplitude of the R wave in the V3-V6 leads were analyzed. The area of the QRS complex was calculated as a sum of three triangles. While drawing up a triangle according to the S wave one of the sides went over from the S wave top across the J point till crossing the isoline. The amplitude and duration of the T wave were also taken into consideration. It was established that evaluation of the area of the QRS complex, whose magnitude is an integrated index of changes in all the elements of the ventricular complex, is of the greatest value in the diagnosis of CHD during bicycle ergometry.
mesh_terms: D000328:Adult; D000787:Angina Pectoris / Q000175:diagnosis; D017023:Coronary Angiography; D003327:Coronary Disease / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D005080:Exercise Test / Q000379:methods; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
vernacular_title: Informativnost' izmeneniĭ élementov EKG pri dozirovannoĭ fizicheskoĭ nagruzke v diagnostike ishemicheskoĭ bolezni serdtsa.