Dispersion of refractoriness

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August undefined, 2024

WebMay 28, 2002 · Background— The role of dispersion of refractoriness and reentry for the genesis of polymorphic ventricular tachycardia (VT) has recently become emphasized. … WebWe used computer simulations to study the possible role of the dispersion of cellular coupling, refractoriness or both, in the mechanisms underlying cardiac arrhythmias. …

Atrial septal pacing: a new approach to prevent atrial fibrillation

WebSolution. Refraction: This is a phenomenon in which light changes its direction of travel when it strikes between the interface of the two different media. Dispersion: Dispersion … WebCalcium alternans produced by increased Sarcoplasmic Reticulum refractoriness cost to install bathtub stopper

Incidence of Dispersion of Refractoriness and Cellular

WebNeither the dispersion of refractoriness nor action potential duration restitution determined during rapid pacing by itself is the major determinant of the location of conduction block during early VF in normal pigs. It may be that these factors interact synergistically with each other as well as wi … WebApr 12, 2024 · The prognostic inflammatory and nutritional index (PINI) is a simple scoring formula allowing the follow-up of dietary protein restriction and infectious complications affecting critically ill patients hospitalized in medical and surgical wards. The World Health organization (WHO) has recently recommended using the binary CRP (C-reactive … WebApr 10, 2024 · Patients were included if they met the diagnostic criteria for TN according to the International Classification of Headache Disorders, 3rd edition, 18 and were prescribed oral lacosamide for the symptomatic treatment of TN pain at any time during their follow-up due to first-line intolerance or refractoriness. Patients were excluded if ... cost to install bidet seat

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The Relative Role of Refractoriness and Source–Sink ... - Springer

WebNov 3, 2007 · Calculated dispersion of refractoriness in the central fiber for different minutes of ischemia (top) and as a function of the width of the vulnerable window for reentry (bottom). Figures ... WebThe local dispersion of conduction and refractoriness has been considered essential for induction of atrial arrhythmias. This study sought to determine whether a difference of … cost to install bidetWebApr 1, 2001 · The dispersion of refractoriness, estimated by the standard deviation of VF intervals, was also increased in the ischaemic zone. 8 Changes in dispersion … made in china 2025 goal

"WebAug 1, 2002 · The increased dispersion of refractoriness in patients with AF was mainly due to the shortening of the minimum AFIs. These findings suggest the involvement of an increased dispersion of atrial ... " - Dispersion of refractoriness

Dispersion of refractoriness

$Refraction vs Dispersion - What$

WebMay 15, 1995 · The underlying mechanism is not exactly known, but dispersion of refractory periods is considered a major factor in both induction and persistence of reentrant arrhythmias in general. … WebA simple finite-element model of ventricular conduction processes that explicitly incorporates spatial dispersion of refractoriness was developed. This model revealed that spatial …

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WebApr 11, 2024 · We previously proposed that cannabinoid receptors (CBR) may have cardioprotective qualities. CB13 is a dual cannabinoid receptor agonist that activates AMPK signaling in ventricular cardiomyocytes. We reported that CB13 attenuates tachypacing-induced shortening of atrial refractoriness and inhibition of AMPK signaling in the rat atria.

WebAtrial pacing locations that decrease atrial activation and dispersion of refractoriness may be preferable in patients with a history of AF. Two different interatrial septum sites have been proposed: the Bachmann's bundle and the coronary sinus ostium. WebNov 24, 1998 · One of the factors that favors the development of ventricular fibrillation is an increase in the dispersion of refractoriness. Experiments will be described in which an increase in dispersion in the recovery of excitability was determined during brief episodes of enhanced sympathetic nerve activity, known to increase the risk of fibrillation.

WebObjective: Dispersion in refractoriness is considered a major factor in induction and persistence of cardiac arrhythmias. The sympathetic nervous system is known to … WebDownload scientific diagram The line graphs summarize the dispersion of effective atrial refractory periods for all the groups. Data are expressed as mean ± SD. The lines represent the mean ...

WebSep 14, 2007 · In this Letter, we demonstrate a novel mechanism for inducing reentry, in which chaos synchronization causes large-scale heterogeneities of refractoriness …

WebThe dispersion of refractoriness permits propagation of the early after-depolarizations and initiation of torsade de pointes ventricular tachycardia. Predisposing factors The most common factor in acquired TdeP VT is a … cost to install bollard postWeb1 day ago · To mimic platelet refractoriness, alloimmunized BALB/C mice were transfused with 2 x10 8 CFDA-SE washed platelets isolated from C57BL/6J mice. At different time points after transfusion (5 minutes, 2 hours, 24 hours, 48 hours, and 72 hours), blood samples were collected by severing the tail and diluting them in EDTA (6 mM). made in china festival gentWebJun 3, 2009 · During acute myocardial ischemia, reentrant episodes may lead to ventricular fibrillation (VF), giving rise to potentially mortal arrhythmias. VF has been traditionally related to dispersion of refractoriness and more recently to the source–sink relationship. Our goal is to theoretically investigate the relative role of dispersion of refractoriness and … made in china 2025 pptWebApr 1, 2001 · Dispersion of refractoriness was calculated as the standard deviation of all local mean fibrillatory intervals expressed as a percentage of the overall mean fibrillatory interval. After baseline measurements, verapamil (0.075 mg/kg intravenous in 10 min) was infused and the measurements were repeated. made in china iptvhttp://cinc.mit.edu/archives/2007/pdf/0313.pdf made in china anna quWebFeb 18, 2005 · Normal ventricular tissue is remarkably resistant to the initiation of re-entry, but this robustness is greatly reduced by actions that increase the spatial dispersion of refractoriness. In this computational study we have shown that regional differences in repolarisation have an interlinked effect not only on the initiation of re-entry but ... made in china 2025 initiativeWebApr 8, 2024 · Axonal damage may lead to spike-train delays, evoked potentials, an increase in the refractoriness of the system, and intermittent blockage of spikes. ... To capture this characteristic, we introduce the delay and distribution on the Poisson spike trains for each fiber so that the DH output matches the experiments (again, see Figure 1B). made in china font