Thirty-one normal subjects and 16 subjects with documented myocardial infarction were studied. The Frank system of vectorcardiography was used. The polar vector and 0.04 polar vector were calculated in all. The 0.04 polar vector was abnormally directed in all cases of documented infarction, including 2 subjects with a documented infarction but a "suggestive" electrocardiogram. The results of th...

The polarcardiographic responses to exercise in normal men, young and middle-aged, have been compared with those of men who show ischemic responses on the electrocardiogram. Changes in the ST-vectors are the most significant. These changes have been reduced to a single numerical quantity based on the spatial magnitude of the vector at the end of the QRS complex and the spatial direction of a ve...

Vectorcardiography is an important area of human and machine pattern recognition. The wide range of interclass variation in observed VCGs is attributed to variations in body structure. IntraManuscript received November 30, 1970; revised April 2, 1971. This research was conducted at Carnegie-Mellon University, Pittsburgh, Pa., and was supported by the National Institute of General Medical Scienc...

The polarcardiographic responses to exercise in normal men, young and middle-aged, have been compared with those of men who show ischemic responses on the electrocardiogram. Changes in the ST-vectors are the most significant. These changes have been reduced to a single numerical quantity based on the spatial magnitude of the vector at the end of the QRS complex and the spatial direction of a ve...

THE formation of a model is an important phase of all scientific thinking in that it serves to demonstrate or explain the workings of an inherently complex natural system in terms that can be more readily understood. In electrocardiography, the Einthoven tri-angle' has been used for years as a relatively simple geometric model of an essentially complex volume conductor, the human torso. This mo...

One hundred patients with suspected coronary heart disease were studied by vectorcardiography (VCG), electrocardiography (ECG), and coronary arteriography. Twenty-eight patients had VCG evidence of anterior infarction; 26 of this group had severe narrowing or obstruction of the left anterior descending branch. Five did not have anterior infarction by ECG. Twenty-seven patients had VCG evidence ...

We derive exact expressions for luminosities of massive vector-boson pairs which can be used to describe the cross sections for processes in hadron collisions or e+e− annihilation which proceed via two-vector-boson scattering. Our approach correctly takes into account the mutual influence of the emission of one vector boson on the emission of a second one. We show that only approximately the ex...