title: [Investigation of the heart function under condition of myocardial ischemia using a new method of electrocardiogram analysis].
abstract: The aim of the paper is to investigate ECG in phase space changes under condition of myocardial ischemia during experiments on entire organism. Regional ischemia was simulated in 13 dogs with the help of catheterization of coronary arteries and obturation of one of the left coronary artery branches by plastic embol. All experiments were done with closed chest and natural breathing. Duration of ischemia was 90 min. ECG in phase space was recorded every 10 min. Some parameters of ECG, first of all parameter reflecting symmetry of T wave were evaluated with the help of program-technical complex Fazograph. Rapid and statistically significant increase of parameter beta(Tau) under in fluence of myocardial ischemia was observed. Changes of beta(T) were the earliest and the most sensitive signs of ischemia among all parameters evaluated.
  
  
  CONCLUSIONS
  Changes of T wave symmetry are sensitive signs of myocardial ischemia, which can be used in clinical practice.
authors.forename: I A
authors.initials: IA
authors.lastname: Chaĭkovs'kyĭ
authors.forename: O P
authors.initials: OP
authors.lastname: Neshcheret
authors.forename: L S
authors.initials: LS
authors.lastname: Faĭnzil'berh
authors.forename: R A
authors.initials: RA
authors.lastname: Rovenets
mesh_terms: D000818:Animals; D003326:Coronary Circulation / Q000502:physiology; D003627:Data Interpretation, Statistical; D004195:Disease Models, Animal; D004285:Dogs; D004562:Electrocardiography; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000503:physiopathology*