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Biomedical subjects

N Endo

Publications and source records attributed to N Endo.

At least 181 records · Page 10Linked to original sources
PubMed1979

Use of digitised left ventricular echocardiograms in assessment of mitral stenosis.

In order to establish a new echocardiographic index of the severity of mitral stenosis, left ventricular echocardiograms were digitised using manual tracing and a computer. The instantaneous left ventricular dimension was measured in 15 patients with mitral stenosis. The peak rate of change of left ventricular dimension (peak dD/dt) and the normalised peak rate (peak dD/dt/D) during early diastole were significantly lower in mitral stenosis than in normal subjects. Also, the time between the second heart sound and peak dD/dt was significantly shorter in patients with mitral stenosis than in normal subjects. Correlation between the mitral valve area calculated from the Gorlin formula and peak dD/dt/D was good, while valve area was poorly correlated with the EF slope of the anterior mitral leaflet echo. It is suggested that by continuous measurement of left ventricular dimension and of its first derivative, the reduced atrioventricular blood flow in mitral stenosis can be shown, and that peak dD/dt/D during early diastole is a possible index of its severity.

Adult↗
PubMed1977

Idiopathic enlargement of the right atrium.

A huge saccular idiopathic dilatation of the right atrium was detected with angiography and echocardiography in a 75 year old man. Cardiac catheterization data were compared with data obtained 4 years earlier. Idiopathic right atrial enlargement is not usually accompanied by tricuspid valve disease, but in this case tricuspid insufficiency did occur over a period of 4 years, possibly as a complication in the late stage of idiopathic right atrial enlargement.

Aged↗
PubMed1977

Echocardiographic measurement of right ventricular wall thickness. A new application of subxiphoid echocardiography.

The feasibility of subxiphoid echocardiography to measure the thickness of the right ventricular wall (RVWT) was investigated. In 87 (90.6%) of the 96 patients studied, adequate visualization of the echoes from the right ventricular wall was obtained using the subxiphoid technique. RVWT averaged 0.34 +/- 0.08 cm (mean +/- 1 SD), ranging from 0.2 to 0.5 cm in 25 normal individuals. This was not significantly different from the values in the left ventricular overload group (0.36 +/- 0.10 cm). However, the RVWT was increased significantly (P less than 0.001) in the combined group (0.62 0.18 cm), the right ventricular (RV) pressure overload group (0.60 +/- 0.13 cm) and the RV volume overload group (0.53 +/- 0.11 cm). Thirty-two patients underwent diagnosis right heart catheterization which revealed a good correlation between the RVWT measured echocardiographically and the right ventricular peak systolic pressure (r = 0.84). Subxiphoid echocardiography was considered to be useful in diagnosing right ventricular hypertrophy in adults.

Adolescent↗
PubMed1977

The study of the third heart sound in relation to the left ventricular filling and wall movement by echocardiography.

The left ventricular filling and wall movement were investigated in subjects with a third heart sound or ventricular gallop by echocardiography. Nine patients with ventricular gallop, who had left ventricular volume overload disease, and 6 normal subjects with a third heart sound had higher normalized peak rate of increase of the left ventricular dimension (peak dD/dT/D) than 10 normal subjects without a third heart sound (p less than 0.01). The normalized lengthening rate in the rapid filling phase was also higher in patients with ventricular gallop than in normal subjects without a third heart sound (p less than 0.05). The time from the second heart sound to peak dD/dT/D and rapid filling time did not show statistically significant values between subjects with ventricular gallop or a third heart sound and those without a third heart sound. These results suggest that higher peak filling, larger filling volume in the rapid filling phase and more abrupt cessation of the outward movement of the left ventricular wall may be a cause of the production of ventricular gallop in patients with left ventricular volume overload and of the physiological third heart sound.

Adolescent↗