An electrocardiographic pattern was encountered in patients with cerebrovascular accidents which consisted primarily of T waves of large amplitude and duration. Large U waves were often present which may fuse in part or entirely within the T wave. Because of the presence and fusion of the T and U waves, the prolonged Q-T interval associated with the pattern was most probably a Q-U interval.

The blood supply of the interventricular septum has been studied in 43 normal human hearts, from patients dying of noncardiac causes. The specimens were prepared by injection of vinylite into the coronary arteries. Description is made of the normal vascular anatomy of this area, and its clinical importance is discussed.A LTHOUGH the interventricular septum comprises a large portion of the myocardium, study and description of its normal blood supply have been neglected; one standard textbook of anatomy fails even to mention it.' This lack of attention may be attributed to its relative inaccessibility for anatomic studies without disturbing its structural relationships. Injection of colored opaque solutions, followed by clearing in various oils, fails to display the interventricular septum adequately.2' 3 Stereoscopic roentgenograms of injected coronary arteries result in overlapping of septal vessels to such an extent that their individual identification becomes difficult, if not impossible.3 "Unrolling" the heart before the roentgenograms are taken4 isolates the septum but also removes it from its spatial orientation.Laubry, Soulie, and Thys5 injected radiopaque material into the coronary arteries and then obtained roentgenograms of the isolated interventricular septum, whereas HermanekM examined the blood supply of this region by dissection alone; both these studies, however, were concerned primarily with infarction and coronary anastomoses in the septum.For examination of the normal blood supply of the heart a more satisfactory method is injection of a noncorroding substance into the arteries, followed by corrosion of the supporting structures to leave a cast of the arteries. Additional casts of the cardiac chambers result in a spatially oriented replica of the en-tire heart. Casting of the chambers of only one side of the heart makes possible examination of the vessels in the interventricular septum. This method was employed in the present study to obtain information regarding the normal blood supply of the human interventricular septum. MATERIAL AND METHODSForty-three human hearts, of patients (32 men and 11 women) who died of noncardiac causes, were examined. Ages ranged from 12 to 81 years, with similar frequency distribution in each decade except for the eighth and ninth decades of life, which contained 1 patient each.These hearts were normal in weight and the ventricles on gross inspection were not hypertrophied. In all hearts the valves were examined under direct vision through the aorta, main pulmonary artery, venae cavae, and pulmonary veins; in this series none of the hearts had pathologic valves. The coronary arteries were inspected at their ostia prior to cannulation, and for their entire length where visible in the epicardium; the arteries of all hearts in the series were patent for their visible length and none exhibited atherosclerosis of a degree indicative of compromising blood flow. The hearts and other gross organs of these patients were normal in color (specifically no remarkable pallor), bu...

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