The objective of this work was to verify the correlation between haemodynamic (KT), echocardiographic (ECHO) and vectorcardiographic (VCG) parameters in valvular aortic stenosis (VAS). The VCG was analyzed by the Louvain programme and compared with reference ECHO and KT parameters--transvalvular peak-gradient (PG), mean gradient (MG) and valvular area (AREA)--in 54 consecutive patients with isolated VAS. Of the 84 correlations studied, only three proved to be significant for linear parameters and six for angular parameters. The best correlation was observed between the azimuthal angle of the spatial area vector of the QRS loop and MG-KT (r2 = 0.36, p less than 0.01). On the other hand, there was no significant correlation between the reference parameters and the amplitude of the QRS spatial maximum vector. The conclusion was drawn that there was no linear correlation between the VCG indicators of LVH and ECHO and KT indices of severity in an unselected VAS population. Each method carries its own limitations and each must be used as a complement to other methods.