[Analysis of hypotensive and hemodynamic effects of prazosin in patients with hypertension].

The clinical effect of the peripheral vasodilator prazosin (Adwersuten, GDR) was studied in 51 patients with second-stage essential hypertension. A single dose of 1 to 2.5 mg produced hypotensive effect in 48 (94.

[Chaotic atrial rhythm (problems of diagnosis and treatment)].

The article gives a clinical and electrocardiographic analysis of 16 cases with chaotic atrial rhythm in ischemic heart disease and in diseases which cause overexertion, dilatation, and changes of the atrial myocardium. The significance of such diagnostic criteria of chaotic atrial rhythm as the presence of three or more different P waves in each ECG lead, the absence of a dominative atrial pacemaker, differnt P--P, P--R, and R--R periods, and the isoelectrical PP segment is confirmed. Symptoms are pointed out for differentiating chaotic atrial rhythm from polytopic atrial extrasystole, cardiac fibrillation, and supraventricular pacemaker migration.

[Atrial tachycardia with atrioventricular block].

A clinico-electrocardiographic analysis of 25 cases with atrial tachycardia and atrioventricular block was conducted. Confirmation was established of the connection between the development of atrial tachycardia with atrioventricular block and changes in the myocardium, circulatory insufficiency, acute coronary failure and toxicosis with cardiac glucosides. Such signs of atrial tachycardia with atrioventricular block as the rate of atrial rhythm of 150 to 250 per minute, the possibility of fluctuations in the P-P interval, the presence of an isoelectric PP segment, and atrioventricular block of various degree were found to be of the highest diagnostic value.

[Origin of the deep and wide T-wave in myocardial diseases].

The presented analysis concerns the clinical and electrocardiographic data of dynamic examinations of 15 patients in whom ECG recorded a deep and wide ("gigantic") inverted T-wave. In 5 cases the clinical and electrocardiographic data were compared with the anatomic ones. It was demonstrated that a wide and deep inverted T-wave is common in ischaemic heart disease and inflammatory lesions.

[Classification and clinical-electrocardiographic evaluation of his bundle-branch block].

Investigation covered 114 patients with ischemic heart disease exhibiting electrocardiographic signs of deranged intraventricular conduction. Major ECG changes with blocked left anterior and left posterior brances of the bundle of His and also in combined blocks of two and three branches are described. A quantitative spatial analysis of the ECG in corrected orthogonal leads after McFee with determination of the initial, terminal and median orientation of the QRS vector in the frontal plane, as well as of the azimuth and elevation was made.