[Arrhythmogenic right ventricular dysplasia. Case report and review of the literature]. / Arrhythmogen jobb kamrai dysplasia. Esetismertetés és irodalmi áttekintés.

Two cases of arrhythmogenic right ventricular dysplasia are described. The most important clinical features of the disease are malignant ventricular arrhythmia and sudden death. It is characterized by the loss of right ventricular musculature and by the fatty and connective tissue infiltration of the right ventricular wall. The diagnosis is based on the typical echocardiographic appearance of right ventricular dilatation, on the presence of negative T waves in leads V1-4 on the resting ECG and on ventricular tachycardia of left bundle branch block pattern. Right heart failure develops only in the late phase of the disease. Genetic defect might be an etiologic factor. In conclusion authors suggest that in case of left bundle branch block ventricular tachycardia or Adams-Stokes syndrome in young adults echocardiography and family screening are necessary.

Effects of coronary occlusion and norepinephrine on the myocardium of alloxan-diabetic dogs.

The aim of this study was to clarify the role of altered diabetic vascular reactivity in ischaemic heart disease. In diabetic condition, the necrotic area of myocardial infarction was significantly extended and myocardial oedema failed to develop after administration of norepinephrine 2 or 48 hours after ligation of the left anterior descending coronary artery. In metabolically healthy dogs the necrotic area of myocardial infarction was considerably smaller and an increase in myocardial water content, in myocardial thiocyanate space, in microscopically demonstrable permeability and in diastolic stiffness of left ventricular wall occurred when norepinephrine was administered 2 or 48 hours after coronary infarction. A close correlation was demonstrable between enhanced water content, thiocyanate space and diastolic stiffness in metabolically healthy animals, whereas in diabetic condition diastolic stiffness was primarily increased, and decreased when norepinephrine was infused after coronary ligation. Therefore, the altered vascular reactivity in diabetes is supposed to be responsible for the lack of oedema in the nonischaemic part of myocardium after norepinephrine infusion as well as for the size and severity of myocardial infarction.

[Histological, ECG and enzyme studies on dogs following direct current shock applied to the heart region]. / Hisztológiai, EKG- és enzimvizsgálatok kutyákon szívtájékra alkalmazott D.C. shock után.

Authors using D.C. (direct current)--have produced shock experimentally- at 28 dogs. In the control animals (8 dogs) no histological, EKG and enzymatic changes could be revealed. In the dogs after the application of D.C of 1 X 2.5 W. sec/kg histological and EKG changes were not revealed, although the level of GOT and CPK increased significantly. After the application of D.C. of 4 X 5 W. sec/kg significant increase of the level of the following enzymes occurred: GOT, isoenzyme- LDH5, total-LDH and CPK. In 7 dogs--out of 8 showing histological changes in the myocard--activity of the serum isoenzyme-LDH1 increased and alterations of the EKG occurred. Thoracic musculature of six experimental dogs was investigated histologically. All of them revealed pathological changes. Correlation between the level of the isoenzyme- LDH1, the histological and EKG alterations were found. Increase of the level of serum enzymes seems to be the consequence of the injury of the thoracic-musculature by D.C. shock, and has clinical significance only in cases when pathologic changes of the EKG and increase of the insoenzyme-LDH1 are also present.