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Clinical Implication of Mechanical Dyssynchrony in Heart Failure
Qing Zhang,Cheuk-Man Yu 한국심초음파학회 2012 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.20 No.3
Mechanical dyssynchrony is a common phenomenon in patients with congestive heart failure, which usually identified by noninvasive cardiac imaging tools such as echocardiography. It demonstrates electromechanical delay in some regions of the failing heart which in turn contributes to further impairment of cardiac function. The diagnostic, therapeutic and prognostic values of mechanical dyssynchrony have been reported in a number of studies. Therefore, this review describes briefly the methods of measurement, but more importantly, explains the clinical implication of its assessment in heart failure related aspects including cardiac resynchronization therapy, functional mitral regurgitation, diastolic heart failure and mortality.
Baicalein and wogonin inhibit collagen deposition in SHR and WKY cardiac fibroblast cultures
( Ebenezer KC Kong ),( Yu Huang ),( John E Sanderson ),( Kar Bik Chan ),( Shan Yu ),( Cheuk Man Yu ) 한국생화학분자생물학회 (구 한국생화학회) 2010 BMB Reports Vol.43 No.4
In order to demonstrate the potential therapeutic effect of two flavonoids, Baicalein and Wogonin, on suppression of pathological myocardial fibrosis in hypertension, we investigated their in vitro effects on collagen expression in primary cultured cardiac fibroblasts isolated from neonatal normotensive (WKY) and hypertensive (SHR) rats. Our results showed that over-expression of collagen mRNA and protein induced in cardiac fibroblasts by angiotensin (AngII) could be attenuated significantly by both flavonoids at an optimal dosage (30 μM; P < 0.01). Results of immunoblots showed that expression of 12-LO level, p-ERK/ ERK ratio and MMP-9 in AngII-stimulated SHR cardiac fibroblasts were significantly down-regulated by both flavonoids. Our results show that both Baicalein and Wogonin can suppress collagen deposition in AngII-stimulated SHR and WKY cardiac fibroblasts. [BMB reports 2010; 43(4): 297-303]
Anderson Chun On Tsang,Simon Sui Man Lai,Wai Choi Chung,Abraham Yik Sau Tang,Gilberto Ka Kit Leung,Alexander Kai Kei Poon,Alfred Cheuk Hang Yu,Kwok Wing Chow 대한초음파의학회 2015 ULTRASONOGRAPHY Vol.34 No.2
Purpose: The aim of this study was to validate a computational fluid dynamics (CFD) simulationof flow-diverter treatment through Doppler ultrasonography measurements in patient-specificmodels of intracranial bifurcation and side-wall aneurysms. Methods: Computational and physical models of patient-specific bifurcation and sidewallaneurysms were constructed from computed tomography angiography with use ofstereolithography, a three-dimensional printing technology. Flow dynamics parametersbefore and after flow-diverter treatment were measured with pulse-wave and color Dopplerultrasonography, and then compared with CFD simulations. Results: CFD simulations showed drastic flow reduction after flow-diverter treatment in bothaneurysms. The mean volume flow rate decreased by 90% and 85% for the bifurcation aneurysmand the side-wall aneurysm, respectively. Velocity contour plots from computer simulationsbefore and after flow diversion closely resembled the patterns obtained by color Dopplerultrasonography. Conclusion: The CFD estimation of flow reduction in aneurysms treated with a flow-divertingstent was verified by Doppler ultrasonography in patient-specific phantom models of bifurcationand side-wall aneurysms. The combination of CFD and ultrasonography may constitute a feasibleand reliable technique in studying the treatment of intracranial aneurysms with flow-diverting stents.