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40 results on '"Kuribayashi, Toshiro"'

9. Myocardial disarray at junction of ventricular septum and left and right ventricular free walls in hypertrophic cardiomyopathy

Author

Kuribayashi, Toshiro and Roberts, William C.

Subjects
Heart muscle -- Physiological aspects, Ventricular septal defects -- Physiological aspects, Cardiomyopathy, Hypertrophic -- Physiological aspects, Health
Abstract

The abnormality of the myocardium in hearts with hypertrophic cardiomyopathy (HC) was assessed regarding whether the muscle bundle in the midwall layer maintains its normal circular and continuous orientation surrounding the left ventricular (LV) cavity. Forty-seven autopsied hearts with HC were examined. The LV wall midway between the base and apex was divided into 6 segments in the transverse plane. Histologically, the circular orientation was destroyed largely or completely due to marked fascicle disarray in 77% of the anterior and posterior junctional segments. In 33% of the middle portion of the ventricular septum and in 34% of the anterior and posterior portions of the LV free wall, the midwall layer showed disarray of muscle fibers or small fascicles. In contrast, the lateral LV free wall was devoid of disarranged fibers in its midwar layer. Myocardial fibrosis usually was predominant in the portion where disarray was marked. There were deep tissue clefts often in the area of junction. In 11 hearts (7 from patients aged >65 years), the circular unit was intact in almost every segment, as it was in 9 of 10 control hearts. The destruction of the circular unit in the area of septal-free wall junctions in most patients with HC is a previously undescribed morphologic feature of HC. This discontinuity may result from retention of an abnormal fetal myocardial architecture in which the septal latitudinal muscle was continuous with the right ventricular free wall.

Published
1992

16. Systolic Outward Motion of the Left Ventricular Apical Wall as Detected by Magnetic Resonance Tagging in Patients with Apical Hypertrophic Cardiomyopathy

Author

Tsukamoto, Masaki, primary, Hirasaki, Satoshi, additional, Kuribayashi, Toshiro, additional, Matsuo, Akiko, additional, Matsui, Hiroyuki, additional, Sawada, Takahisa, additional, Nakamura, Takashi, additional, Azuma, Akihiro, additional, Sugihara, Hiroki, additional, and Matsubara, Hiroaki, additional

Published
2006
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24. Improved Survival of Idiopathic Dilated Cardiomyopathy in the 1990s

Author

Azuma, Akihiro, primary, Matsuo, Akiko, additional, Nakamura, Takashi, additional, Kawasaki, Tatsuya, additional, Yamamoto, Kazuto, additional, Hyogo, Masayuki, additional, Hirata, Atsuhide, additional, Hirasaki, Satoshi, additional, Shima, Takatomo, additional, Sugihara, Hiroki, additional, Kunishige, Hiroshi, additional, Kuribayashi, Toshiro, additional, and Nakagawa, Masao, additional

Published
1999
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36. Echocardiographic determination of stroke volume during rapid atrial pacing and volume loading in normal rats.

Author

Nakamura, Takashi, Matsumuro, Akiyoshi, Kuribayashi, Toshiro, Matsubara, Kinya, Shima, Masami, Shimoo, Kazutoshi, Katsume, Hiroshi, and Nakagawa, Masao

Abstract

Objective: The aim was to validate echocardiographic assessment of acute changes of left ventricular stroke volume in normal rats. Methods: By transthoracic use of a 7.5 MHz ultrasonic transducer, the left ventricular dimensions were determined before and during rapid atrial pacing and saline infusion in seven Wistar rats weighing 310-470 g. Left ventricular volume was calculated from short axis dimensions according to a cube function formula. Echo stroke volume (SVE) was then compared with that obtained simultaneously using a pulsed Doppler flow meter placed around the ascending aorta (SVF). Results: The SVE (ml) was decreased from 0.30(SD 0.12) to 0.13(0.06) by rapid pacing and increased from 0.27(0.12) to 0.63(0.16) by volume loading. Regression analysis showed high correlations between SVE and SVF during both pacing (r=0.84) and infusion (r=0.91) studies. Furthermore, correlations between SVE and SVF in individual animals were very close (r=0.87-0.99 in the pacing study and 0.92-0.99 in the volume study). Interobserver and intraobserver variances were small, with close correlations (r=0.96-0.99) and modest standard errors of the estimate (0.02-0.04 ml) between the two measurements. Conclusions: Echocardiography allows reliable in vivo measurement of cavity dimensions and assessment of acute alterations in stroke volume in normal rats. [ABSTRACT FROM PUBLISHER]

Published
1992

37. Echocardiographically documented acute aortic insufficiency induced by Amplatz left guide catheter

Author

Kawasaki, Tatsuya, Azuma, Akihiro, Tsukamoto, Masaki, Yamamoto, Teruyuki, Kawata, Koichi, Sugihara, Hiroki, Kuribayashi, Toshiro, and Nakagawa, Masao

Abstract

This paper examines a case of sudden systolic pressure fall, tachycardia, low pulse pressure, and high pulmonary artery wedge pressure due to acute aortic insufficiency which was induced by an Amplatz left (AL-1) guide catheter used for better guide support during percutaneous transluminal coronary angioplasty of the right coronary artery. AL guide catheters can cause acute aortic insufficiency, of which practitioners should be aware when sudden hemodynamic collapse occurs. (Int J Cardiovasc Intervent 2000; 3: 237–239)

Published
2000
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40. Familial Heart Block and Sick Sinus Syndrome of Adult Onset

Author

KIRIYAMA, Toshiaki, primary, MIZUTANI, Takaaki, additional, KAKUSUI, Keiichi, additional, WADA, Masaru, additional, ISODA, Tsugio, additional, INOUE, Masashi, additional, OKABE, Tomoko, additional, TANIGUCHI, Shigemi, additional, and KURIBAYASHI, Toshiro, additional

Published
1979
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