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Biomedical subjects

C Streian

Publications and source records attributed to C Streian.

84 records · Page 5Linked to original sources
PubMedDate not supplied

Echocardiographic assessment of aortic stenosis.

Abnormal thickening and limited or eccentric mobility of the aortic leaflets were used as indicators of the aortic stenosis (AS). The magnitude of ventricular hypertrophy in response to afterloading was determined by wall stress, with wall thickness. Measures of the echocardiographic internal dimensions of the left ventricle, wall thickness and circumferential fiber shortening (Vcf), were able to characterize left ventricular function in 13 patients with AS. In moderate and severe AS with normal left ventricular function, left ventricular end-diastolic dimension (Dd) was normal, posterior wall thickness (Wt) increased and myocardial contraction (Vcf) was normal. In patients with left ventricular failure, Dd was increased and myocardial contraction markedly depressed. Echocardiography is a noninvasive method for estimating the severity of aortic stenosis and it appears to be more sensitive than other currently employed techniques.

Adolescent↗
PubMedDate not supplied

[Technic of implanting cardiac pacemakers, using the endovenous route].

An original technique is presented, used for the approach of the vein in the delto-pectoral space with the aid of an electrode floated through the arm veins of patients being prepared for cardiac pacemaker implantation by an endovenous route. The method is useful in those patients in whom the vein cannot be detected in the delto-pectoral space with the aid of the usual methods. This method allows to discover the vein with great ease, avoiding additional incisions, as well as long manoeuvers involving some risks for the patient.

Adult↗
PubMedDate not supplied

Echocardiographic approach to the early diagnosis of congestive cardiomyopathies.

M-mode echocardiography was used to study left ventricular (LV) function in 25 patients with congestive cardiomyopathy (CC). Good discrimination of patients with CC from a control group of normal subjects was possible using echocardiographic parameters. Symptomatic patients (group II) with CC had a significantly larger LV end-diastolic diameter (LVED) than the asymptomatic ones (group 1) but the differences in the shortening fraction (SF), ejection fraction (EF), and mean velocity of circumferential fiber shortening (Vcf) were not statistically significant. Asymptomatic patients showed significant differences from normal in LVED, SF, EF and Vcf. End-systolic wall stress is a quantitative index of true myocardial afterload that can be plotted against LV end-systolic diameter to give an index of contractility independent of loading conditions. End-systolic wall stress in normal subjects (64.80 +/- 19.50 X 10(3) dyn/cm2) was significantly lower than in patients with CC (169.6 +/- 13.43 X 10(3) dyn/cm2). In conclusion the LV echocardiographic parameters can be conveniently combined to provide a good recognition and estimation of patients with CC, even in early stages.

Adult↗
PubMedDate not supplied

Echocardiographic evaluation of left ventricular function before and after cardioversion of atrial fibrillation to normal sinus rhythm.

Echocardiographic measurements were obtained in 20 patients before cardioversion immediately after and two, four and six hours after cardioversion to normal sinus rhythm. At six hours after cardioversion there was no significant change in heart rate, left atrial diameters (LAD), left ventricular end-diastolic diameters (LVEDD) or left ventricular end-systolic diameters (LVESD). On follow-up one month to nine months after cardioversion, 14 of the 20 patients (70%) remained in normal sinus rhythm. Neither LAD, LVEDD, or LVESD, nor the presence or amplitude of the A-wave on the mitral valve echogram correlated with the persistence or normal sinus rhythm.

Adult↗
PubMedDate not supplied

The effects of prazosin in severe congestive heart failure. An echocardiographic study.

Twelve patients with severe chronic congestive heart failure (CHF) received prazosin in a dose of 4 to 20 mg daily for a period of 2 months, in addition to cardiac glycoside and diuretic drugs. After this treatment left ventricular end-diastolic diameter decreased from 5.7 +/- 0.4 to 5.4 +/- 0.4 cm (p less than 0.001), left ventricular end-systolic diameter decreased from 4.3 +/- 0.5 to 4 +/- 0.5 (p less than 0.001), left ventricular stroke excursion increased from 1.03 +/- 0.11 to 1.27 +/- 0.15 cm (p less than 0.01), the ejection fraction increased from 24.9 +/- 2.1 to 32.2 +/- 2.8 (p less than 0.001) and the mean velocity of circumferential fiber shortening increased from 0.68 +/- 0.06 to 0.79 +/- 0.08 circumferences/s (p = 0.06). Prazosin treatment clearly relieved dyspnea and fatigue. Three patients improved from Class IV to Class III, four patients improved from Class IV to Class II and 3 patients from Class III to Class II.

Adult↗
PubMedDate not supplied

Evaluation of segmental wall motion disturbances by echocardiography in ischemic heart disease.

Echocardiographic septal and posterior wall motion and thickness were measured in 55 subjects, of whom 20 patients with acute myocardial infarction, 20 with chronic coronary artery disease and 15 control subjects without evidence of cardiac disease. The results of the study that systolic thinning is indicative of an acute event. Abnormal changes in systolic wall thickening and wall motion occur commonly in patients with chronic coronary artery disease. Useful information about segmental wall motion abnormalities can be obtained from the echocardiogram when the areas involved can be visualized, but much of the ventricle is not routinely examined.

Chronic Disease↗
PubMedDate not supplied

Complete atrioventricular block in patients with acute inferior myocardial infarction. Clinical spectrum and prognostic significance.

Patients with acute inferior myocardial infarction (IMI) and complete atrioventricular block (CAVB) have a wide range of mortality rate. This raises the question whether there is no other risk factor that interferes in this particular situation. In our study, mortality rate in patients with acute IMI and CAVB was significantly greater than in patients without conduction disturbance, but the occurrence of right ventricle myocardial infarction (RVMI) enhanced the mortality rate regardless of the presence or absence of CAVB.

Echocardiography↗