[ECG dynamics at rest and during exertion after mitral commissurotomy]. / Dinamika EKG v pokoe i nagruzkakh posle mitral'noi komissurotomii.

Four degrees of left atrial electrical activity were identified by ECG made before and after closed mitral commissurotomy in 70 patients with mitral stenosis and sinus rhythm. The critical electrical activity of the left atrium and hypertrophy of the right ventricle along with the typical auscultation pattern of mitral stenosis were found to cardiographically correspond to critical stenosis of the left atrioventricular ostium in most cases. The area of the mitral orifice, which was attributable to that of the body, was 0.6 to 0.8 cm2/m2. The patients with critical left atrial electrical activity were considered to be at risk for atrial fibrillation in the immediate postoperative period.

[Aortocoronary bypass in progressive stenocardia]. / Aortokoronarnoe shuntirovanie pri progressiruiushchei stenokardii.

The authors evaluate the efficacy of aortocoronary shunting in the treatment of 10 patients with progressive angina pectoris (unstable stenocardia) in follow-up periods of up to 12 months after the operation. In none of the patients did angina pectoris or myocardial infarction develop in the indicated postoperative periods.

[Aortocoronary shunting in unstable and early postinfarction angina pectoris due to lesion of a coronary artery]. / Aortokoronarnoe shuntirovanie pri nestabil'noi i rannei postinfarktnoi stenokardii, osbuslovlennoi porazheniem odnoi koronarnoi arterii.

Aortocoronary shunting was performed in 15 patients with unstable and early postinfarction angina pectoris. Coronarography revealed an isolated lesion of a coronary artery in all the patients. Two years after the operation the patients had no angina pectoris; no myocardial infarctions occurred.

[Aortocoronary shunting in the early period after myocardial infarction]. / Aortokoronarnoe shuntirovanie v rannie sroki posle voznikno- veniia infarkta miokarda.

Fourteen patients aged 34-54 years underwent aortocoronary bypass surgery for early postinfarction angina within 30 days following myocardial infarction. In periods up to 1.5 years after surgery, angina pectoris was not detected in the patients; cases of recurrent myocardial infarction were not registered.

[Normal indicators of spiroergometry in young persons]. / Norma'lnye pokazateli spiroérgometrii u lits molodogo vozrasta.

The stepwise bicycle ergometric test was conducted in 57 normal untrained individuals (30 females and 27 males) in order to estimate their maximum oxygen uptake. To make the results more reliable, individual variations in subjects' maximum working capacity should be considered. Cardiac stroke volume was shown to be different at the peak of exercise. The same stress capacity, shown in a heterogeneous sample, may be indicative of both normal and abnormal conditions, or signify different functional classes.

[Mitral stenosis and the problem of critical constriction in blood circulation]. / Mitral'nyi stenoz i problema kriticheskogo suzheniia v krovoobrashchenii.

The results of a combined echocardiographic study of 127 patients with mitral stenosis are reviewed. Echocardiographic and hemodynamic parameters are divided into 3 groups with respect to the severity of mitral stenosis. A relationship is demonstrated between mitral opening area and diastolic pressure gradient, as evidenced by dopplerography. The definition of critical mitral stenosis is given. A classification of the severity of mitral stenosis on the basis of two-dimensional echocardiography is offered, that provides indications for surgery.