ABSTRACT
A new approach to the choice of diagnostic criteria of combined ventricular hypertrophy (CVN) is proposed: after determination of EKG parametres differing from the norm are separately compared to the EKG parametres in isolated left ventricular hypertrophy (LVH) and right ventricular hypertrophy (RVH). The diagnostic parametres were chosen on the basis of computer statistical analysis of EKG-35 data of 136 patients with CVH, 39 with LVH, 57 with RVH and 71 normal subjects. For differentiation from LVH the amplitude/area ratio (S10 + S17 + S24)/(S1 + S8 + S15) and R27/R17 was effectively used, for differentiation from RVH parametres R14/R1 or S25/S27 are recommended. The amplitude parameters provide the sensitivity of the method of 58.8% with the specificity of 94.6%; the use of area ratio of the same waves increases sensitivity up to 72.8% with the specificity of 94.4%. Sensitivity of the method with the use of the Sokolov-Lyon criteria for diagnosis of LVH and RVH in the same groups was 9.6% with the specificity of 94%.
Subject(s)
Cardiomegaly/diagnosis , Electrocardiography/methods , Cardiomegaly/physiopathology , Diagnosis, Differential , Heart Ventricles/physiopathology , MaleABSTRACT
Eighty-two apparently normal subjects and 90 patients with combined atrial dilatation were investigated, using automated amplified-image atrial VCG reproduction with an output of spatial characteristics of the Macfee-Parungao P loop, a method developed at the All-Union Center for Cardiologic Research (USSR Academy of Medical Sciences). Area enclosed by spatial P loop (SPxyz greater than or equal to 0.017 mV2), mean vector size (MPxyz greater than or equal to 120.6 microV) and P loop duration (tPxyz greater than or equal to 0.116 sec) showed the highest diagnostic value. The use of these integral characteristics of the spatial P loop improved identification of two dilated atria, bringing the detection rate to 92%, as compared to 53.3% obtainable with ECG from 12 standard and orthogonal leads.
Subject(s)
Cardiomegaly/diagnosis , Vectorcardiography , Adolescent , Adult , Aged , Computers , Electrocardiography , Female , Heart Atria , Humans , Male , Middle Aged , Vectorcardiography/instrumentationABSTRACT
The method of recording the ECGs, inputting them into a computer and automatic analysis of 35 ECG leads is described. The proposed method largely diminishes the time expenditure and difficulties in obtaining and analysing 35 ECG lead mapping grams, as the computer makes all measurements and calculations and produces a final document.
