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Deflection area vectors of QRS (Aqrs) and T (At) and ventricular gradient (G) calculated from vectorcardiographic leads were compared in single vessel coronary artery diseases divided into subgroups of normokinetic, hypokinetic and akinetic by left ventriculography. In the LAD group, Aqrs shifted posteriorly, At were smaller and shifted to the right and G were smaller and shifted posteriorly or to the right. In the RCA group, Aqrs were smaller and shifted upwards, At shifted upwards and G were smaller and shifted upwards. In the LCx group, Aqrs shifted upwards, At shifted anteriorly and upwards and G were smaller and shifted upwards. Decreased magnitude and directional change of G reflect the severity and location of myocardial damage.

Clinical significance of Aqrs, At and ventricular gradient in single vessel coronary artery diseases.