FIELD: medicine. SUBSTANCE: method involves selecting left atrium systole area. Ascending wave segment duration is compared to the total atrium systole duration. The ratio value under study being greater than 40%, reduced left atrium wall tonus conclusion is to be drawn. The ratio value being equal to 20-40%, retained left atrium wall tonus conclusion is to be drawn. The ratio value being less than 20%, increased left atrium wall tonus conclusion is to be drawn. EFFECT: enhanced effectiveness in showing left atrium role in diastolic disorders and developing early signs of cardiac insufficiency.
