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Biomedical subjects

Y Takabatake

Publications and source records attributed to Y Takabatake.

At least 73 records · Page 4Linked to original sources
PubMed1980

Variable prognosis in congestive cardiomyopathy. Role of left ventricular function, alcoholism, and pulmonary thrombosis.

Prognosis of 36 patients with congestive cardiomyopathy was studied in relation to various clinical factors. Half life of the survival curve after overt heart failure was about 7 years. Although left ventricular function was a major determinant of clinical course in congestive cardiomyopathy in general, its relation to prognosis was variable according to the type of cardiac involvement. In peripartal cardiomyopathy and in a type of cardiomyopathy named subacute cardiomyopathy with pulmonary thrombosis in this paper, factor(s) other than left ventricular function, possibly including pulmonary thrombosis, may be operative as more important determinant of extremely poor prognosis in these subtypes. Alcoholic cardiomyopathy was also unique in its favorable prognosis in association with reversible cardiomegaly following abstention from alcohol.

Adult↗
PubMed1977

Continuous assessment of left ventricular volume by ultrasonic analogue conversion system.

Applicability of ultrasonic analogue conversion system devised by us for assessments of left ventricular volume was examined in patients with and without heart disease. The conversion system could sample the echoes from the endocardial surfaces of the interventricular septum and the posterior left ventricular wall. The conversion system could also calculate automatically the minor axis and volume of the left ventricle. End-diastolic, end-systolic, and stroke volumes calculated by the conversion system were close to those calculated from biplane ventriculograms and to those calculated from photographic records of B-mode echo-display. Change in left ventricular volume caused by respiration ranged up to 17.5%. Spontaneous variations in left ventricular volume during continuous monitoring was up to 7.5%. End-diastolic, end-systolic, and stroke volumes were reduced by sublingual administration of nitroglycerin. The results indicate applicability of the ultrasonic analogue conversion system for continuous assessments of left ventricular volume in man.

Analog-Digital Conversion↗
PubMed1976

Hemodynamic studies on hypertrophied hearts in man.

A total of 31 patients were studied during cardiac catheterization. Hemodynamics in 9 cases with cardiac hypertrophy secondary to chronic volume load (MI, AI) and in 9 cases with cardiomyopathy were compared to those in 5 normal cases, 5 cases with MS and 5 cases with near normal left ventricle. A hypertrophied left ventricle had an enlarged cavity, an increased wall mass and an elevated systolic midwall tension. Peak systolic stress in left ventricular wall was normal in compensated patients with volume load, but below normal in compensated patients with cardiomyopathy. Peak systolic stress was elevated in decompensated patients either with regurgitation or with cardiomyopathy. The significance of this stress difference between volume over load and cardiomyopathy was discussed. Depressed pump function was observed in hypertrophied left ventricle especially in cardiomyopathy.

Adult↗
PubMed1975

Hemodynamic and clinical significances of atrial fibrillation, pulmonary vascular resistance and left ventricular function in rheumatic mitral stenosis.

Seventy-four patients with rheumatic mitral stenosis were catheterized and hemodynamic and clinical significances of atrial fibrillation, pulmonary vascular resistance and left ventricular function were studied. These data were also compared to those in the 6 control cases. In addition to the correlation of mitral valve area to the functional classification of patients, significance of atrial fibrillation was also demonstrated. Patients with this arrhythmia had lower cardiac index than those with regular sinus rhythm by approximately 20%, throughout the range of mitral valve area observed. The lower average cardiac index was associated with a higher average left ventricular end-diastolic pressure in cases with atrial fibrillation than in cases without the arrhythmia, in the face of similar average heart rate and average mitral valve area; Average pulmonary vascular resistance correlated to the functional classification, but its systematic influence on the relation between mitral valve area and cardiac index was not observed. Abnormalities of left ventricular function were suggested frequently by various combinations of abnormal values in end-diastolic pressure, end-diastolic volume, ejection fraction, angiographically-measured circumferential fiber shortening velocity (Vcf), and pressure-derived maximal contractile element velocity (Vmax). Patients with enlarged left ventricle had significantly lower average cardiac index than those with normal ventricular size.

Adult↗
PubMed1975

Left ventricular asynergy in mitral valve diseases. A cineangiographic study.

Mode of left ventricular contraction was studied by cine left ventriculography in 22 cases with mitral valve diseases and 7 control cases. In rheumatic mitral valve diseases, local hypokinesis of the left ventricular wall and poor contraction of the mitral annulus were observed frequently, at various location and to various extent. Transient asynergic motion of local wall was also seen either during systole or during diastole. Local hypokinesis was seen even in normal-sized left ventricles, and was associated with decreased cardiac pump performance, when its localization was extensive. Severe mitral regurgitation of rheumatic nature was always associated with poor contraction of the mitral annulus, although the reverse was not true.

Adolescent↗