His bundle block and concealed His bundle premature depolarization.

His bundle electrocardiograms were recorded from a patient with previously unexplained PR prolongations or shortenings suggestive of both type I and II second degree AV block. The conduction disturbances were due to the association of concealed His bundle depolarizations (H') not propagated to atria or ventricles with first degree AV block in the His bundle. These data strongly suggest that frequent spontaneous His bundle depolarizations are another manifestation of a disease process involving the His bundle, a kind of "Sick--His bundle syndrome".

[Stenosis of the trunk of the left coronary artery. Contribution of coronary arteriography and hemodynamic correlations. Apropos of 34 cases].

From a study of 34 cases, the authors have tried to define the characteristic features of this very specialised type of coronary artery disease. From the clinical standpoint, if the common combination of uncontrolled angina and a past history of myocardial infarction are taken as representative, the basal ECG can in no way differentiate the diagnosis; on the other hand tests on the bicycle ergometer appear to have a good indicative value. Coronary arteriography shows the sharply isolated character of the stenosis of the trunk which is part of the picture of diffuse coronary disease, and the frequency (2 cases out of 3) of total coronary occlusion.