An analysis of the planarity of the vectorcardiographic QRS loop characterised by disease condition

The CSE diagnostic database, for which one has 100% accurate diagnoses for 500 recordings, was used to investigate both the dispersion from the QRS plane and the planarity of the QRS vector loop characterised by disease condition. After eliminating records with multiple disease conditions or mixed QRS morphometries, 446 recordings: normals (n=149); left (n=71), right (n=15) and biventricular (n=21) ventricular hypertrophy (LVH, RVH, BVH); anterior (n=67), inferior (n=96), and combined (n=27) myocardial infarction (AMI, IMI, MIX) were processed further. Total least squares procedures were used to determined the QRS plane of best fit for the QRS vector loops obtained from the representative beat of the X, Y and Z leads for each recording. The authors found that both the dispersion and the planarity were significantly less (p<0.05) for normals than any of LVH, RVH, AMI, IMI and MIX. There was no significant difference for either parameter between normals and BVH