scholarly journals Anisotropic Conduction and Re-entry in the Heart

2020 ◽  
Vol 9 (4) ◽  
pp. 174-174
Author(s):  
Demosthenes G Katritsis
Keyword(s):  
Anisotropic Conduction

Imaging nanostructures on ablated kapton polymide

1993 ◽  
Vol 51 ◽  
pp. 872-873
Author(s):  
Daniel L. Callahan ◽  
H. M. Phillips ◽  
R. Sauerbrey
Keyword(s):  
Electron Microscopy ◽  
Polymer Surface ◽  
Grating Period ◽  
Laser Wavelength ◽  
Integrated Devices ◽  
Transmission Electron ◽  
Excimer Laser Irradiation ◽  
Produce Line ◽  
Line Patterns ◽  
Anisotropic Conduction

Excimer laser irradiation has been used to interferometrically ablate submicron line patterns on to Kapton polyimide. Such patterned material may exhibit highly anisotropic conduction as was predicted from previous studies showing enhanced conductivity from uniformly ablated material. We are currently exploiting this phenomenon to create integrated devices using conventional polymers as both dielectrics and conductors. Extensive scanning electron microscopy (SEM) and limited transmission electron microscopy (TEM) have been conducted in order to characterize the morphology of such patterned nanostructures as a function of processing conditions.The ablation technique employed produces an interference pattern on the polymer surface of period equal to half that of a diffraction grating period, independent of the laser wavelength. In these experiments, a 328 nm grating has been used to produce line patterns of 164 nm line-spacings as shown in Figures 1 and 2. A 200 Å Au coating has been used to both prevent charging and, perhaps more importantly, enhance contrast.

Electrophysiological Effects of Flecainide on Anisotropic Conduction and Reentry in Infarcted Canine Hearts

Circulation ◽  
1995 ◽  
Vol 91 (8) ◽  
pp. 2245-2263 ◽  
Author(s):  
James Coromilas ◽  
Adam E. Saltman ◽  
Bernd Waldecker ◽  
Stephen M. Dillon ◽  
Andrew L. Wit
Keyword(s):  
Electrophysiological Effects ◽  
Anisotropic Conduction

scholarly journals Anisotropic Conduction Properties in Canine Atria Analyzed by High-Resolution Optical Mapping

Circulation ◽  
2002 ◽  
Vol 105 (17) ◽  
pp. 2092-2098 ◽  
Author(s):  
Takahiro Koura ◽  
Motoki Hara ◽  
Susumu Takeuchi ◽  
Kenichi Ota ◽  
Yasumasa Okada ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Mapping ◽  
Anisotropic Conduction ◽  
Conduction Properties

scholarly journals Anisotropic Cardiac Conduction

2020 ◽  
Vol 9 (4) ◽  
pp. 202-210
Author(s):  
Irum Kotadia ◽  
John Whitaker ◽  
Caroline Roney ◽  
Steven Niederer ◽  
Mark O’Neill ◽  
...  
Keyword(s):  
Gap Junction ◽  
Cardiac Tissue ◽  
Diffusion Tensor ◽  
Interstitial Fibrosis ◽  
Cardiac Conduction ◽  
Principal Mechanism ◽  
Disease States ◽  
And Function ◽  
Anisotropic Conduction

Anisotropy is the property of directional dependence. In cardiac tissue, conduction velocity is anisotropic and its orientation is determined by myocyte direction. Cell shape and size, excitability, myocardial fibrosis, gap junction distribution and function are all considered to contribute to anisotropic conduction. In disease states, anisotropic conduction may be enhanced, and is implicated, in the genesis of pathological arrhythmias. The principal mechanism responsible for enhanced anisotropy in disease remains uncertain. Possible contributors include changes in cellular excitability, changes in gap junction distribution or function and cellular uncoupling through interstitial fibrosis. It has recently been demonstrated that myocyte orientation may be identified using diffusion tensor magnetic resonance imaging in explanted hearts, and multisite pacing protocols have been proposed to estimate myocyte orientation and anisotropic conduction in vivo. These tools have the potential to contribute to the understanding of the role of myocyte disarray and anisotropic conduction in arrhythmic states.

A new concept of a pseudo-Janus structure: employing a Yin-Yang fish structure film with up/down conversion fluorescence and bi-anisotropic conduction to represent the pseudo-Janus structure as a case study

2020 ◽  
Vol 8 (25) ◽  
pp. 8676-8688
Author(s):  
Haina Qi ◽  
Yunrui Xie ◽  
Xiuling Yang ◽  
Liu Yang ◽  
Qianli Ma ◽  
...  
Keyword(s):  
Yin Yang ◽  
Down Conversion ◽  
Anisotropic Conduction

The pseudo-Janus structure is advanced and the Yin-Yang fish structure film is employed to represent the pseudo-Janus structure as a case study.

scholarly journals Tissue-specific determinants of anisotropic conduction velocity in canine atrial and ventricular myocardium.

1994 ◽  
Vol 74 (6) ◽  
pp. 1065-1070 ◽  
Author(s):  
J E Saffitz ◽  
H L Kanter ◽  
K G Green ◽  
T K Tolley ◽  
E C Beyer
Keyword(s):  
Conduction Velocity ◽  
Ventricular Myocardium ◽  
Tissue Specific ◽  
Anisotropic Conduction
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