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Biomedical subjects

Y Torii

Publications and source records attributed to Y Torii.

At least 181 records · Page 10Linked to original sources
PubMed1981

[Analysis of left to right ventricular stroke count ratio by gated radionuclide angiocardiography: detection and quantitation of valvular regurgitation and shunts (author's transl)].

The stroke count ratio (SC ratio: SCL/SCR) for left to right ventricular enddiastolic-endsystolic count differences was obtained from LAO multi-gated cardiac blood pool scintigrams for quantitative assessment of valvular regurgitation and shunts. SC ratio, 1.48 +/- 0.24 (mean +/- S.D.) in 21 normal subjects, was decreased in 7 patients with atrial septal defects (ASD) and in one with isolated tricuspid regurgitation (TR), and increased in 15 patients with aortic regurgitation (AR) and in 6 with mitral regurgitation (MR). In post-surgical reassessment of 3 patients, the ratio was restored in normal range. Comparison between SC ratio and angiographic estimates of regurgitation revealed good agreement. Regurgitant fraction (RF) in AR or MR and shunt ratio (SR) in ASD were calculated by the formula: RF = 1-1.48/SC ratio, and SR = 1-SC ratio/1.48, respectively. These were derived by assuming that an excess of stroke counts was due to regurgitant or shunt flow and that the coefficient in counting ventricular radioactivity was 1.48. Agreement was found between RF or SR measured by this formula and by the invasive method. This method permits noninvasive quantitation in patients with valvular regurgitation and shunts without complicated computer procedures.

Aortic Valve Insufficiency↗
PubMed1980

Visualization of right atrial appendix by thallium-201 myocardial scintigraphy: concise communication.

The atrial myocardium has been barely visible with thallium-201 myocardial scintigraphy. This is probably related to the difference in size, distance from anterior chest wall, and small coronary blood flow of the atrium, compared with the ventricle. We have encountered eight cases of visualization of the right atrial appendix (RAA). All had disease involving the right side of the heart, such as mitral stenosis (four cases), congenital heart disease (two), cor pulmonale (one), and primary myocardial disease (one). The RAA was identified from multiple projections in all cases and sometimes confirmed by radionuclide angiocardiography. The RAA was seen at the right upper aspect of the ventricles and was distinguishable from them. Evidence derived from ECG, chest radiographs, and cardiac catheterization, indicated that the most important factor in the visualization might be the displacement of the RAA to a more anterior position.

Adult↗