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Biomedical subjects

D I Chikvashvili

Publications and source records attributed to D I Chikvashvili.

At least 19 recordsLinked to original sources
PubMed1992

[Hemodynamic effects of intravenous allapinine in patients with myocardial infarction].

Single intravenous allapinine, 30 mg, given to patients with acute myocardial infarction, including those with moderate circulatory insufficiency, fails to affect central hemodynamic parameters or has a favourable action: normalizes pulmonary diastolic pressure, cardiac index, diminishes total peripheral vascular resistance. The agent also produces a weak antihypertensive effect and increases heart rate.

Aconitine↗
PubMed1991

[Evaluation of the overall contractile function of the right ventricle using two-dimensional echocardiography in patients with myocardial infarction].

The paper presents two methods for calculating the contractile function of the right ventricle (RV): (1) three-plane one with the use of short- and long-axis-cut RV; (2) single-plane one which was modified to the use of long-axis RV images in the projection of 4 chambers. A total of 56 patients with first acute gross myocardial infarction were studied. A control group included 14 healthy subjects aged 25-60 years. The proposed three-plane method for estimating the volume parameters and ejection fraction of the right ventricle was shown to correlate with contrast ventriculography significantly. A high correlation was found between the stroke output of RV (as calculated for the left ventricle by the Chapman method) and that (by the three-plane method). The RV volume values in patients with anterior or inferior myocardial infarction suggest that there is a trend to suppress RV function in the patients, but it is more specific for those with inferior myocardial infarction.

Adult↗
PubMed1991

[Effects of restored blood flow on the contractile function of the right ventricle in patients with acute myocardial infarct: data of two-dimensional computerized echocardiography].

The volumes of the right and left ventricles were measured in 78 patients with first acute transmural myocardial infarction at days 1, 3, 7, 14, and 28 of the disease. Thirty four patients were diagnosed as having anterior myocardial infarction, 35 presented with inferior myocardial infarction, and 9 had a concurrent right and left ventricular inferior wall myocardial infarction. A high incidence of right ventricular dysfunction was confirmed both in anterior and inferior myocardial infarction. The most profound right ventricular contractile dysfunctions were detected in patients with proximal right coronary occlusion in the absence of reperfusion. Successful thrombolytic therapy for myocardial infarction was found to affect right ventricular function to a lesser extent than left function.

Adult↗
PubMed1990

[Effect of thrombolytic, anticoagulant and anti-thrombocytic therapy on the development of left-ventricular thrombosis and the incidence of thromboembolic complications in patients with myocardial infarction].

To reveal the effects produced by thrombolytic and anticoagulative therapies on the formation of left ventricular mural thrombosis (LVT) and the frequency of thromboembolic events, a prospective randomized study was performed in 285 patients with primary transmural myocardial infarction. LVT was diagnosed from the serial two-dimensional echocardiographic findings. No significant effect of the therapy with thrombolytic and anticoagulative agents was found on the incidence and periods of intracavitary LVT development. There was a significant reduction in the incidence of LVT during early (less than 3 hours) reperfusion of the occluded coronary artery. Anticoagulative and antiplatelet therapies performed within the first month of myocardial infarction decrease the risk for systemic thromboembolism in patients with diagnosed LVT.

Blood Coagulation↗
PubMed1990

[Modern methods for the instrumental diagnosis of intracavitary thrombosis of the left ventricle in myocardial infarct].

To study the sensitivity and specificity of two-dimensional echocardiography in the diagnosis of left ventricle thrombosis which often attends myocardial infarction and to define diagnostic potentialities of the new research methods (digital subtraction ventriculography and MR tomography), 449 patients with acute transmural myocardial infarction were examined. Based on the comparison of the echocardiographic readings and morbid anatomy data it has been shown that the sensitivity of two-dimensional echocardiography in revealing left ventricle thrombosis amounts to 89%, specificity to 88%. Digital subtraction ventriculography has a lower (77%) sensitivity, with the specificity being satisfactory enough (88%). Meanwhile MR tomography enables a highly precise diagnosis of left ventricle thrombosis and can be used as a supplementary diagnostic method in questionable cases and in thrombi small in size or in unsatisfactory ultrasonic visualization of the heart structures.

Echocardiography↗
PubMed1988

[Computerized two-dimensional echocardiography in acute myocardial infarction. Possibility of determining the size of necrotic focus].

Myocardial asynergic area was estimated, using a new special mathematical model based on computerized assessment of echocardiographic images, in 42 patients with first acute transmural myocardial infarction. The results were compared with those of other standard methods used for the estimation of the size of damage, and with morphologic findings in 7 fatal cases. The latter comparison demonstrated that the special estimate of asynergic area, unlike the planimetric method, used earlier, showed a high correspondence to the actual size of damage. The comparison of echocardiographic data to those obtained by other techniques showed a significant correlation with the results of serial MB CFK assays and myocardial 201Tl scintigraphy.

Echocardiography↗
PubMed1988

[Study of the effect of the restoration of coronary blood flow on left-ventricular contractility in patients with acute myocardial infarction based on the data of computerized two-dimensional echocardiography].

Total and local left-ventricular contractility was assessed by computerized two-dimensional echocardiography in 52 patients with acute myocardial infarction. Three groups of patients were identified: those with recovered coronary flow (group 1), reperfusion failure (group 2) and the lack of occlusion at first coronarography (group 3). Patients from group 3 showed the most intact left-ventricular myocardial contractility and the most favorable clinical course of the disease, while second-group patients had particularly impaired left-ventricular contractility. In the first group, the size of the asynergic area diminished by day 28 of the disease to a greater extent, as compared to the second group. Therefore, coronary reperfusion within the first 6 hours after the attack shows correlation to a smaller asynergic zone and a more favorable clinical course of the disease.

Coronary Circulation↗
PubMed1988

[Determination of the right ventricular volume and ejection fraction by echocardiography (a comparison with angiographic data)].

The determination of function of all cardiac chambers is important in clinical practice. The improvement of the method of two-dimensional echocardiography permitting visualization of the right ventricle (RV) in different topographic projections made possible ultrasonic assessment of RV function. The RV volume and ejection fraction were determined by two-dimensional echocardiography in 25 patients and the results obtained were compared with contrast ventriculography findings. Taking into account the complexity of geometrical shape of the right ventricle its volume based on the results of echocardiography, equaled the sum of the volumes of 3 figures: 2 frusta and one cone. Comparing the results obtained by two methods, significant correlation of all indices characterizing RV function (r-0.85-0.89) was revealed. The prospects of future development of the calculation of RV volumetric indices by the results of two-dimensional echocardiography were discussed. Limitations of the use of this method were described.

Adult↗
PubMed1987

[Unstable stenocardia: indicators of platelet activity and the effect of verapamil].

Beta-thromboglobin (BTG) and 4 platelet factor (4PF) blood concentration reflecting platelet functional state were determined by radioimmunoassay in 17 patients with unstable angina pectoris, in 18 patients with severe stable angina pectoris (IV functional class) and in 6 healthy subjects. Patients with unstable angina pectoris exhibited signs of platelet activation, i.e significant increase in blood BTG and 4PF concentration, which made qualitative difference from the patients with severe but stable form of the disease. The study of platelet activity at the peak of pain attack has demonstrated further increase in BTG and 4PF concentration in 6 patients having high initial characteristics. In 12 patients with unstable angina pectoris verapamil effect on the platelet functional activity was studied, they exhibited a decrease in BTG and 4PF concentration by intravenous injections as well as by long-term oral administration.

Adult↗
PubMed1987

[Normal indices of left ventricular function assessed by using computer technology].

While analysing ventriculograms of 18 persons without any cardiovascular pathology 3 "independent" research workers (to exclude a subjective factor in the appraisal of the left ventricle contours) have developed normal indicators of the total and regional contractility of the left ventricle. The data obtained with the use of angiographic and computer-aided techniques of the recent generation and machine analysis employing unpaired statistics can be recommended for application as normal indicators during the performance of different hemodynamic studies.

Adult↗
PubMed1987

[Detection of multiple lesions of the coronary arteries in patients after myocardial infarction. Data of two-dimensional stress echocardiography during the test of transesophageal atrial electric stimulation].

The method of two-dimensional stress echocardiography with transesophageal atrial electrostimulation was used for determination of patients with high risk of complications among those who had survived myocardial infarction. The results of the test were compared to the degree of the coronary artery lesion. The highest sensitivity of the method (94%) in identification of patients with 2 or 3 involved coronary arteries was registered when appearance of new areas with damaged local contractility was used as a criterium. When depression of the ST segment for more than 2 mm or decrease of the left ventricular total ejection fraction for more than 5% was used as a criterium, the sensitivity of the method was correspondingly 72 and 78%.

Adult↗
PubMed1987

[Embolism of the anterior descending artery as a cause of myocardial infarct in a patient with a prosthetic aortic valve].

A patient aged 42 with the aortic valve prosthesis was examined with the help of coronography and ultrasonic scanning of the heart in the period of ischemic injury of the anterior myocardium: occlusion of the unchanged anterior descending artery by an embolus formed on the artificial cardiac valve was revealed. Despite rapid recovery of arterial permeability (3 h 47 min, after the onset of disease) by intracoronary administration of streptase with subsequent anticoagulant and antiplatelet drug therapy the patient developed anterior myocardial infarction with left ventricular aneurysm and intracardiac thrombosis.

Adult↗
PubMed1987

[Evaluation of the informative value and safety of the transesophageal atrial electric stimulation test in patients with unstable stenocardia and myocardial infarction (data of 24-hour ECG monitoring)].

The effect of the transesophageal pacing test (TEPT) on the occurrence of ventricular arrhythmias and ischemic episodes was examined on the basis of 24-hour ECG monitoring in patients with unstable angina (UA) and myocardial infarction (MI). It is demonstrated that TEPT is a relatively safe test for UA and MI patients (to be performed on day 10-14), which does not provoke severe arrhythmias during and after the testing, but for short paroxysms of ventricular tachycardia seen in 2-4% of the cases. Both painful and painless ST displacements were recorded during the test; ST elevation was only noted in MI patients. The time of ECG baseline recovery was longer in painful ischemic episodes, as compared to painless ones. The TEPT test is a valuable instrument for detecting latent atrioventricular conductivity disorders in UA and MI patients.

Adult↗
PubMed1986

[2-dimensional computed echocardiography. The potentials and limitations of the method in determining the global and local contractile function of the left ventricle].

To study the possibilities of two-dimensional echocardiography (2EchoCG) in evaluating total and regional left ventricular contractility using computerized quantification as compared to biplane contrast ventriculography (CVG) 50 subjects were examined. There was a good correlation between the values of the end-diastolic and end-systolic volumes and the ejection fraction obtained by the two techniques (r = 0.79-0.86) when the volume parameters were calculated by the disk method using Simpson's rule. When the "area-length" method of calculation was used the correlation factors were somewhat lower; 2EchoCG was shown to underestimate the volume parameters and the ejection fraction as compared to CVC. The analysis of regional contractility determined by the method of area changes in a floating axis system revealed high sensitivity and specificity of 2EchoCG as compared to CVG data, the sensitivity being highest when the lateral and septal left ventricular regional contractility was analyzed and lowest when decreased regional contractility was revealed in the inferior area.

Adult↗