Myocardial oxygen gradient was altered variously by means of gas mixture inhalation in acute coronary artery occlusion in dog. This was correlated with the S-T segment elevation in electrocardiograms recorded in a bipolar subepicardial lead across the pink area and cyanotic area of the myocardium. The electrocardiograms revealed a positive relation between them, that is, the S-T segment increased in height with the increasing of oxygen gradient, and decreased in height with the decreasing of gradient. Occasionally there were also observed S-T segment electrical alternans and the merging of the S-T segment. Implications were briefly discussed.
The present paper presents a method of constructing Burger triangles directly from living toad hearts in situ. Depolarization and repolarization Burger triangles from same toads were almost identical. It was shown, that the Burger triangle is more accurate than the Einthoven triangle. The two expedients of Brody, which simplify the use of the Burger triangle, are illustrated. Burger triangular shapes from toads approximate those of Wilson, constructed from human subjects with a current dipole on thorax.
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