An Increase in the Left Atrium Volume During Exercise is Associated With a Positive Result of a Diastolic Stress Test in Patients With Arterial Hypertension.

Aim: To study the relationship between changes in left atrial volume (LAV) during exercise and the result of a diastolic stress test (DST) in patients with arterial hypertension (AH).

Material And Methods: The study included 219 patients with AH without ischemic heart disease and atrial fibrillation. During the DST performed before and after exercise, the ratio of transmitral flow velocity to mitral annular velocity (E/e'), the left atrial global longitudinal strain in the reservoir phase (reservoir strain), and LAV were determined.

How to approximate fuzzy sets: mind-changes and the Ershov Hierarchy.

Computability theorists have introduced multiple hierarchies to measure the complexity of sets of natural numbers. The Kleene Hierarchy classifies sets according to the first-order complexity of their defining formulas. The Ershov Hierarchy classifies limit computable sets with respect to the number of mistakes that are needed to approximate them.

Features of Left Atrial Appendage Thrombosis in Patients With Persistent Nonvalvular Atrial Fibrillation After COVID-19.

Aim      To evaluate the incidence and characteristic features of left atrial appendage (LAA) thrombosis in patients with persistent nonvalvular atrial fibrillation (AF) after COVID-19.Material and methods  Transesophageal echocardiography (TEE) was performed for 469 patients (57.4 % males; mean age, 64.

Left Atrial Strain as a Predictor of Diastolic Stress Test Results in Patients With Arterial Hypertension.

Aim      To study a possibility of using the left atrial strain (LAS) for predicting results of the noninvasive diastolic stress test (DST) in patients with arterial hypertension (AH).Material and methods  The study included 98 patients previously diagnosed with AH. As a part of evaluation for complaints of dyspnea, palpitation or pain in the area of the heart, DST and transthoracic echocardiography were performed.

The left atrial appendage thrombosis of in patients with persistent atrial fibrillation after the novel coronavirus infection.

Aim      To evaluate the incidence and features of left atrial appendage (LAA) thrombosis in patients with persistent atrial fibrillation (AF) after novel coronavirus infection (COVID-19).Material and methods  Percutaneous echocardiography (pcEchoCG) was performed for 128 patients with persistent AF prepared for cardioversion, 36 (28.1 %) of whom had had COVID-19.

Risk of Cardiovascular Complications in Patients with Persistent Atrial Fibrillation after Dissolution of a Thrombus in the Left Atrial Appendage.

Aim      To compare the incidence of cardiovascular complications (CVC) in patients with persistent atrial fibrillation (AF) following thrombus dissolution in the left atrial appendage (LAA) and in patients with persistent AF without preceding LAA thrombosis.Material and methods  The main group included 43 patients who had been diagnosed with LAA thrombosis on the first examination, transesophageal echocardiography, and who showed dissolution of the thrombus on a repeated study performed after 7.1+2.

Classifying equivalence relations in the Ershov hierarchy.

Computably enumerable equivalence relations (ceers) received a lot of attention in the literature. The standard tool to classify ceers is provided by the computable reducibility . This gives rise to a rich degree structure.

[Gustatory sensitivity threshold to table salt and efficacy of the treatment of newly diagnosed patients with antihypertensive therapy].

Gustatory sensitivity threshold to table salt (GST) and extracellular fluid volume (EFV) were determined in 128 patients with arterial hypertension (mean age 54.1+-0.5 yr; 79 men) before and 3 month after antihypertensive therapy.

[Heart remodeling in case of isolated systolic arterial hypertension].

Examination of 32 patients with isolated systolic arterial hypertension (office blood pressure 171.9 = -3.3/79.

[Right ventricle remodeling in patients with hypertensive disease].

Examination of 92 patients with grade I-II hypertensive disease showed that the emergence and enhancement of left ventricular concentric hypertrophy cause no changes in the volume of heart cavities and ventricular systolic function but result in the lengthening of the left ventricle and the diminishing of the right ventricle. These findings are interpreted in terms of Torrent-Guasp's theory of monolayer spiral ventricular structure.