Conclusions: Results of the study show distinct differences in the TCRT parameter values between VT patients and non VT patients for both lead sets.
The theory of the ventricular gradient (7) is a base for the concept of the TCRT (spatial QRS-T angle) parameter, which is one of the most important risk factors of VT.
The TCRT parameter is defined as an average of cosines of the angles between vectors formed loop of R wave in a subspace U and T wave vector (Fig.
Range of physiological (from 0[degrees] to 130[degrees], TCRT <1, -0.64)) and pathological (from 130[degrees] to 180[degrees], TCRT < -0.64, -1 >) values of angles between directions of main T wave and R wave vectors were determined according to Kardys et al.
Specificity and sensitivity of the TCRT parameter in identifying patients with VT were calculated In two groups of patients after myocardial infarction: 13 non--VT patients and 30 VT patients.
Mean value ([+ or -] SD) of the TCRT parameter calculated for 61 leads was -0.80 [+ or -] 0.27 (Median value (Me) = -0.88) for VT patients and 0.27 [+ or -] 0.46 (Me = 0.43) for non VT patients.
In the obtained results, the distinct differences in the TCRT parameter values were observed between group of patients with VT and group of patients without VT for both lead sets.