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Biomedical subjects

N C Nanda

Publications and source records attributed to N C Nanda.

At least 217 records · Page 12Linked to original sources
PubMed1976

Echocardiography in the diagnosis of pericardial effusion.

Echocardiography is perhaps the most useful and accurate method of diagnosis of pericardial effusion. Its noninvasive nature and the ease with which it may be repeated make it doubly attractive. In the hands of a skilled echocardiographer, its accuracy is unequaled by other methods such as carbon dioxide injections, radionuclide angiography, and intra-atrial angiography. In addition, echocardiography as an aid to safe pericardiocentesis may become widely applicable.

Echocardiography↗
PubMed1975

Mitral commisurotomy versus replacement. Preoperative evaluation by echocardiography.

Echocardiographic studies of the mitral valve were performed in 57 patients with pure or predominant mitral stenosis who subsequently underwent surgery (30 commissurotomy, 27 valve replacement). Mitral valve calcification was graded heavy (thick, conglomerate echoes), light (multiple, discrete linear echoes) or none (thin, single or duplicate signals). Valve mobility, measured as the excursion from the systolic closed position to the fully opened position in diastole, was classified as normal (20 mm or over), restricted (16-19 mm) or poor (15 mm or less). Absence of mitral valve caclification was the most useful echocardiographic indicator for commissurotomy (18 of )9 cases. The most reliable criteria for valve replacement were heavy valve calcification (11 of 11 cases) and poor cusp mobility (11 of 11 cases). The poor mobility group included 3 patients with heavily calcified valves. Thus 37 of 57 cases (65%) could be reliably categorized regarding the type of surgery performed using these three parameters. The remaining echocardiographic parameters (normal mobility, restricted mobility and light calcification) were less valuable in the assignment of the operative category. Echocardiographic assessment of mitral valve calcification and mobility appears to be of value in planning the surgical approach in patients with pure or predominant mitral stenosis.

Adult↗
PubMed1975

Echocardiography of the tricuspid valve in congenital left ventricular-riht atrial communication.

Two patients, ages 14 and 18, with congenital left ventricular-right atrial communication through a defect in the tricuspid valve were studied by echocardiography. Proof was obtained by angiocardiography and surgery in one and ultrasonic contrast injection and angiocardiography in the other. Both presented clinically as uncomplicated ventricular septal defects. Echocardiography consistently demonstrated a high frequency, low amplitude flutter of the tricuspid valve in systole and none in diastole. Following surgical correction of the defect in one patient, there was complete disappearance of the systolic flutter. Systolic flutter has not been observed with tricuspid incompetence nor with other forms of ventricular septal defects. Fistulous communication from the aorta to the right atrium just above the tricuspid valve did not demonstrate systolic flutter in one patient studies. Tricuspid valve systolic flutter appears to be caused by the passage of the left ventricular jet blood into the right atrium through a defect in the tricuspid valve. Echocardiographic study of the tricuspid valve is of value in the recognition of the congenital left ventricular-right atrial communication.

Adolescent↗
PubMed1975

Echocardiographic features of subpulmonic obstruction in dextro-transposition of the great vessels.

Eleven patients with dextro-transposition of the great vessels (TGV) and subpulmonic (left ventriclar outflow) obstruction documented by cardiac catheterization and angiography were studied by echocardiography. Echocardiographic features were which characterized the outflow obstruction included a) prolonged diastolic apposition of the mitral valve with the ventricular septum (10 patients), b) smaller width of the pulmonary artery as compared to the aortic root (10 cases), and c) narrowing of the subpulmonic area demonstrated by beam anglation studies through the planes of the mitral valve and the pulmonary artery (five cases). In addition, four patients showed abnormal systolic anterior movements (SAMs) of the anterior mitral leaflet resembling those observed in idiopathic hypertrophic subaortic stenosis. The SAM'S WERE LARGE IN THREE PATIENTS AND MAY HAVE ACCENTUATED THE OUTFLOW OBSTRUCTION. Additional evidence for this was provided by the movement of the pulmonary valve towards closure with the onset of the mitral SAM'S. These features were uncommon or absent in a comparison group of 17 patients with TGV and no outflow obstruction. Echocardiography appears to be useful in the diagnosis of subpulmonic muscular obstruction in TGV. Demonstration of definite mitral SAM'S IN SOME PATIENTS SUGGEST THE PRESSENCE OF ASSOCIATED FUNCTIONAL OBSTRUCTION OF THE TYPE SEEN IN IDIOPATHIC HYPERTROPHIC SUBAORTIC STENOSIS.

Adolescent↗