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Toty Onggar,Eric Häntzsche,Rolf-Dieter Hund,Chokri Cherif 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
High-performance textile filament yarns, more precisely glass filament (GF) yarn, were used as base material forthe development of sensor yarns (SY) because GFs offer high tensile strengths and moduli of elasticity in addition tobeneficial decomposition temperatures and elongation. The aim of this work was the creation of a multifunctional sensor yarn(MFSY) based of GF. To achieve this aim, a homogeneous, completely coated first (1st) and second (2nd) silver (Ag) layerwas built on the GF yarn surface by developing new technologies. The 1st Ag layer monitors damage within thethermoplastic composite globally, whereas the 2nd Ag layer monitors it locally and defects interface damage. Also, there wasan insulation layer between two Ag layers, leading to a total of three layers built on the GF surface. Its surface morphologywas determined by light and scanning electron microscopy (SEM) to assess Ag layer properties, such as structure,homogeneity, and cracking. For structural analysis, GFs were investigated using a Fourier transform infrared spectrometer(FTIR). The Ag layer thickness was determined after coating and metallization. Textile-physical tests of the GF in terms oftensile strength, elasticity modulus, elongation at break, yarn fineness and electric conductivity, were carried out before andafter silvering.
Janek Salatzki,Andreas Ochs,Nadja Kirchgäßner,Jannick Heins,Sebastian Seitz,Hauke Hund,Derliz Mereles,Matthias G. Friedrich,Hugo A. Katus,Norbert Frey,Florian André,Marco M. Ochs 한국심초음파학회 2023 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.31 No.1
BACKGROUND: Dobutamine and adenosine stress cardiac magnetic resonance (CMR) imaging is relatively contraindicated in patients with moderate to severe aortic valve stenosis (AS). We aimed to determine the safety of dobutamine and adenosine stress CMR in patients with moderate to severe AS. METHODS: In this retrospective study patients with AS who underwent either dobutamine or adenosine stress CMR for exclusion of obstructive coronary artery disease were enrolled. We recorded clinical data, CMR and echocardiography findings, and complications as well as minor symptoms. Patients with AS were compared to matched individuals without AS. RESULTS: A total of 187 patients with AS were identified and compared to age-, gender- and body mass index-matched 187 patients without AS. No severe complications were reported in the study nor the control group. The reported frequency of non-severe complications and minor symptoms were similar between the study and the control groups. Nineteen patients with AS experienced non-severe complications or minor symptoms during dobutamine stress CMR compared to eighteen patients without AS (p = 0.855). One patient with AS and two patients without AS undergoing adenosine stress CMR experienced minor symptoms (p = 0.562). Four examinations were aborted because of chest pain, paroxysmal atrial fibrillation and third-degree atrioventricular block. Inducible ischaemia, prior coronary artery bypass grafting, prior stroke and age were associated with a higher incidence of complications and minor symptoms. CONCLUSIONS: Moderate to severe AS was not associated with complications during CMR stress test. The incidence of non-severe complications and minor symptoms was greater with dobutamine.
Liu, Bin,Ho, Hsiang-Ting,Brunello, Lucia,Unudurthi, Sathya D.,Lou, Qing,Belevych, Andriy E.,Qian, Lan,Kim, Do Han,Cho, Chunghee,Janssen, Paul M. L.,Hund, Thomas J.,Knollmann, Bjorn C.,Kranias, Evangel Oxford University Press 2015 Cardiovascular research Vol.108 No.2
<P><B>Aims</B></P><P>Cardiac calsequestrin (CASQ2) and histidine-rich Ca-binding protein (HRC) are sarcoplasmic reticulum (SR) Ca-binding proteins that regulate SR Ca release in mammalian heart. Deletion of either CASQ2 or HRC results in relatively mild phenotypes characterized by preserved cardiac structure and function, although CASQ2 knockout (KO), or Cnull, shows increased arrhythmia burden under conditions of catecholaminergic stress. We hypothesized that given the apparent overlap of functions of CASQ2 and HRC, simultaneous ablation of both would deteriorate the cardiac phenotype compared with the single knockouts.</P><P><B>Methods and results</B></P><P>In contrast to this expectation, double knockout (DKO) mice lacking both CASQ2 and HRC exhibited normal cardiac ejection fraction and ultrastructure. Moreover, the predisposition to catecholamine-dependent arrhythmia that characterizes the Cnull phenotype was alleviated in the DKO mice. At the myocyte level, DKO mice displayed Ca transients of normal amplitude; additionally, the frequency of spontaneous Ca waves and sparks in the presence of isoproterenol were decreased markedly compared with Cnull. Furthermore, restitution of SR Ca release was slowed in DKO myocytes compared with Cnull cells.</P><P><B>Conclusion</B></P><P>Our results suggest that rather than being functionally redundant, CASQ2 and HRC modulate cardiac ryanodine receptor-mediated (RyR2) Ca release in an opposing manner. In particular, while CASQ2 stabilizes RyR2 rendering it refractory in the diastolic phase, HRC enhances RyR2 activity facilitating RyR2 recovery from refractoriness.</P>