[Relationship between the oscillatory contractions and myocardial tonus in patients with heart defects].

Interplay between contraction oscillations and the tone that is seen during rhythmic stimulation was studied in atrial trabeculae of patients with heart diseases. It was disclosed that in 50% of myocardial preparations from patients with rheumatic heart diseases, an increase in the tone (incomplete relaxation) and oscillations appeared at a frequency of 0.2 HZ.

[Generation of a pulsatile flow in the arterial blood line of an artificial circulation apparatus].

A new type of a ventricle pump incorporated in an arterial blood line of the artificial circulation device has been designed. A poor pulsatile flow generated by the artificial circulation system is transformed by the pump into one characterized by marked fluctuations. It may be synchronized with heart cycle phases, if necessary.

[Effect of cooling on rhythmo-inotropic relations in pathologically altered myocardium].

Fragments of the right atrium auricle from patients with congenital and acquired heart diseases were used to study the effect of the Tyrode solution temperature over the 60-minute cessation of electrical stimulation of the preparations on the recovery of the amplitude of rhythmic contractions after the pause. The lack of stimulation within 34 to 24 degrees C does not lower the contraction amplitude after warming of the preparations and renewal of rhythmic stimulation. The hypothermal pause at a temperature of 10-14 degrees C leads to the development of contractures and suppresses the myocardial contractility.

[Mechanical oscillations in the pathologically altered myocardium].

In pathologically altered myocardium (auricles) of patients with acquired heart diseases, there have been found mechanical oscillations of the tone which occurred after basic contracture induced by electrical stimulation. The oscillations were recorded at a normal ionic composition of Tyrode solution and a temperature of 32-34 degrees C. No mechanical oscillations were normally observed in the myocardium of patients with congenital heart diseases.

[Pulmonary artery aneurysm].

The article is concerned with the questions of etiology, pathogenesis and classification of the aneurysm of the pulmonary artery. Two cases observed by the authors are described. A 38-year-old patient had idiopathic aneurysm of the trunk and the right pulmonary artery.

[Diagnosis of the mitral valve prolapse syndrome in the heart surgery clinic by echocardiography].

The findings of echocardiography in 12 patients with prolapse of the mitral valve are correlated with the clinical and angiocardiographic data and the results of catheterization of the heart cavities. The characteristic symptoms of prolapse of the mitral valve are described.