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Biomedical subjects

A Lautsiavichius

Publications and source records attributed to A Lautsiavichius.

8 recordsLinked to original sources
PubMed1991

[Outcomes of reoperations in dysfunction of mechanical prostheses in relation to the clinical course].

Operations were conducted for the second time on 87 patients (98 operations). Reoperations were performed on 75 (76.5%) and closure of the fistula in 23 (23.5%) patients. The outcome of the operation was appraised according to the clinical course: without sepsis and with prosthetic septic endocarditis, respectively, in 57 (65.5%) and 30 (34.5%) cases. It was found that survival was lower among patients with prosthetic septic endocarditis than among those without sepsis, 37.9% and 53%, respectively. The position of the prosthesis determined the time of the development of the complication, both in fistulas and in thromboses. Disturbances in the function of the prosthesis occur mainly in the first postoperative months in patients without sepsis and in the first months and the late-term periods after surgery in patients with prosthetic septic endocarditis.

Adolescent↗
PubMed1990

[Evaluation of late results of aortocoronary bypass in patients with ischemic heart disease in relation to the bypass function].

The authors analyse 82 patients with aggravation of their clinical condition in the late-term periods after aortocoronary shunting. All were subjected to coronaroshuntography 3.6 +/- +/- 0.5 years on the average, after the operation. The main noninvasive criteria of impaired functioning of the shunts were: increase of the degree of angina pectoris (functional class III-IV according to the Canadian classification), diminished tolerance to physical exertion, appearance of "active" myocardial ischemia. Disturbed functioning of the shunts was mainly manifested within the first year, while progression of atherosclerotic changes in the unshunted arteries--in later periods. The main causes of incompetence of the shunts were: small diameter of the shunted arteries, low rate of blood flow in the shunts, and feverish condition of patients lasting for a long time after the operation.

Adult↗
PubMed1987

[Echo contrast study of the right chambers of the heart in patients with acquired defects and pulmonary hypertension].

Quantitative and qualitative assessments of echo contrast patterns in the right heart chambers were made in 21 patients with acquired valvular diseases and pulmonary hypertension, as compared to 8 healthy adults. Echo contrast techniques are described in detail. Echo contrast patterns were analysed on records from the tricuspid valve, pulmonary artery and inferior cava-hepatic veins. Quick echo contrast streams of right-ventricular loading and ejection were found to be of shorter duration in patients with pulmonary hypertension, who also showed reflux patterns of echo contrast in inferior cava-hepatic veins. These seem to be sensitive indicators of pulmonary hypertension in patients with acquired valvular disease. Therefore, echo contrast studies of the right heart chambers can be an alternative to intracardiac investigation in these patients.

Adolescent↗
PubMed1986

[Diagnostic significance of late ventricular potentials].

A study using two methods of noninvasive registration of ventricular late potentials (VLP), computer averaging and beat-to-beat spatial averaging, was conducted in 27 patients with ventricular tachycardia and 11 healthy volunteers. Both techniques are described in detail. The duration of QRS complex on high resolution ECG was found to be significantly longer in patients with VLP as compared to those of patients without VLP and having ventricular tachycardia as well as healthy adults. The data obtained by both methods do not differ significantly. The beat-to-beat method was not informative in about 20% of cases because of the ineffective filtering procedure and the presence of myographic noise on the amplified CS. The duration of VLP was 44 +/- 20 ms in patients with documented ventricular tachycardia. The sensitivity of the assessment of arrhythmogenic ventricular activity was 70% with the computer method, and 59% with the beat-to-beat spatial averaging technique. The specificity and predictive value of both registration methods were 100%.

Action Potentials↗
PubMed1978

[Relationship between the spike potentials of "local" intra-atrial and esophageal electrocardiograms of the atria and notched P wave of ECG from the body surface].

The interrelationship of spike potentials of "local" intraatrial and esophageal electrograms and notched P wave of an intensified ECG recorded from the body surface was studied. It was found that the process of excitation in the region of the sinus node is reflected in the slow deviation of the P wave of intensified ECG, preceding the appearance of the P wave of an ordinary ECG recorded from the body surface. The A1 spike of a "local" electrogram reflecting the penetration of excitation into the right atrium is manifested in the form of the first notch of the P wave on an intensified ECG. The A2 spike reflecting the arrival of the excitation to the atrioventricular node is manifested in the form of a notch--the first peak of the P wave. The A1(2)) spike reflecting the arrival of the excitation to the left atrium along Bachmann's bundle is manifested as the second peak of the P wave (A1(2)). The A3 spike of the "local" electrogram reflecting the arrival of the excitation from the left atrium to the orifice of the coronary sinus is manifested in the form of the second notch of the P wave (A3).

Action Potentials↗