Search results for "Fibril"

Nanoporous kaolin – cellulose nanofibril composites for printed electronics

2017

Cellulose nano- and microfibrils (CNF/CMF) grades vary significantly based on the raw materials and process treatments used. In this study four different CNF/CMF grades were combined with kaolin clay pigment particles to form nanoporous composites. The attained composite properties like porosity, surface smoothness, mechanical properties and density properties depended strongly on the raw materials used. In general, higher kaolin content (~80 wt%) led to controllable shrinkage during drying, which resulted in improved dimensional stability of composites, compared to a lower kaolin content (~50 wt%). On the other hand, the use of a plasticizer and a high amount of CNF/CMF was essential to pr…

Orālo antikoagulantu potenciālie ieguvumi un riski pacientiem ar ātriju fibrilāciju un perkutānu koronāru intervenci

2018

Ievads: Pacientiem ar ātriju fibrilāciju un perkutānu koronāru intervenci ir nepieciešama “tripla” terapija. Ilgstoša antikoagulācija, ja CHA2DS2-VASc ≥2 punktiem, ir nepieciešama, lai samazinātu insulta un citu trombembolisku komplikāciju biežumu, bet duāla antiagregantu terapija nepieciešama, lai samazinātu stenta trombožu biežumu. Pētījuma mērķis: noskaidrot cerebrovaskulāru un citu sistēmisku embolu biežumu, asiņošanas biežumu, saņemto terapiju, atkārtotu hospitalizāciju biežumu pacientiem ar ātriju fibrilāciju un perkutānu koronāru intervenci. Metode: Pētījums veikts retrospektīvi analizējot vēstures Latvijas Kardioloģijas Centra 11., 27. un 32. nodaļā laika periodā no 2016. gada 1. ja…

Bioelectric model of atrial fibrillation: Applicability of blind source separation techniques for atrial activity estimation in atrial fibrillation e…

2003

In this contribution, we present the theoretical justification that give support to the suitability of blind signal separation (BSS) techniques for the estimation of the atrial activity (AA) present in ECGs of persistent atrial fibrillation (AF). The application of BSS methods to this problem needs the fulfillment of several conditions regarding AA, ventricular activity (VA) and the fashion in which both activities arise on the body surface, that will be justified along the paper. To empirically validate the model, an ICA method is applied to 10 real 12-lead recordings of AF. The identification of AA is put forward based on kurtosis and spectral analysis. The kurtosis value of the estimated…

0134 : Atrial fibrillation is associated with a marker of endothelial function and oxidative stress in patients with acute myocardial infarction

2016

Background Atrial fibrillation (AF), whether silent or symptomatic, is a frequent and severe complication of acute myocardial infarction (AMI). Asymmetric dimethylarginine (ADMA), an endogenous eNOS inhibitor, is a risk factor for endothelial dysfunction. We addressed the relationship between ADMA plasma levels and AF occurrence in AMI. Methods 273 patients hospitalized for AMI were included. Continuous electrocardiographic monitoring (CEM) e48 hours was recorded and ADMA was measured by High Performance Liquid Chromatography on admission blood sample. Results The incidence of silent and symptomatic AF was 39(14%) and 29 (11%), respectively. AF patients were markedly older than patients wit…

0127: Atrial fibrillation is associated with a marker of endothelial function and oxidative stress in patients with acute myocardial infarction

2016

Background Atrial fibrillation (AF), whether silent or symptomatic, is a frequent and severe complication of acute myocardial infarction (AMI). Asymmetric dimethylarginine (ADMA), an endogenous eNOS inhibitor, is a risk factor for endothelial dysfunction. We addressed the relationship between ADMA plasma levels and AF occurrence in AMI. Methods 273 patients hospitalized for AMI were included. Continuous electrocardiographic monitoring (CEM) ≥48 hours was recorded and ADMA was measured by High Performance Liquid Chromatography on admission blood sample. Results The incidence of silent and symptomatic AF was 39(14%) and 29 (11%), respectively. AF patients were markedly older than patients wit…

Should atrial fibrillation be considered a cardiovascular risk factor for a worse prognosis in COVID-19 patients?

2020

Telemedicine-Based Specialized Care Improves the Outcome of Anticoagulated Individuals with Venous Thromboembolism-Results from the thrombEVAL Study.

2020

Venous thromboembolism (VTE) is a life-threatening disease with risk of recurrence. Oral anticoagulation (OAC) with vitamin K antagonists (VKA) is effective to prevent thromboembolic recurrence. We aimed to investigate the quality of OAC of VTE patients in regular medical care (RMC) compared to a telemedicine-based coagulation service (CS). The thrombEVAL study (NCT01809015) is a prospective, multi-center study to investigate OAC treatment (recruitment: January 2011&ndash

Effect of chronic exercise and ATP-sensitive potassium channel blockade on the spectral characteristics evolution of ventricular fibrillation in acut…

2013

Purpose: It has been proposed that chronic exercise produces a KATP channel blockade in ischemic myocardium. We have also reported that channel blockade and training exert very similar effects on energy required to defibrillate. In fact it is postulated that one mechanism by which exercise exerts an antiarrhythmic effect, is by blocking KATP channel. We have analyzed the evolution of spectrum characteristics of ventricular fibrillation (VF), in normoxic conditions and after acute myocardial ischemia, in isolated hearts from trained rabbits, and in hearts submitted to KATP channel blockade. Our hypothesis is that the spectrum characteristics of VF evolve similarly in trained hearts and in he…

Abstract 3420: High-sensitivity Troponin T Improves Cardiovascular Risk Prediction In Patients With Cerebral Ischemia

2012

Background Patients with a cerebral ischemic event are at high risk of recurrent ischemia and other cardiovascular events. Clinical scores are recommended to predict cardiovascular risk in patients with cerebral ischemia to inform secondary preventive measures. Biomarkers may improve risk prediction beyond clinical scores and therefore secondary prevention. Methods Within the observational Find-AF trial (ISRCTN 46104198), 197 patients aged >18 years with cerebral ischemia and without atrial fibrillation had blood sampled at baseline and completed 1-year follow-up. Predictive value of 5 novel cardiovascular biomarkers for a combined vascular endpoint (acute coronary syndrome, stroke, car…

Management of Blood Pressure and Heart Rate in Patients with Acute Stroke

2017

BACKGROUND: Stroke represent one of the most devastating of all neurological diseases, affecting about 15 million people per year and is an important cause of morbidity and mortality worldwide and currently the leading cause of adult disability in developed countries. Blood pressure and heart rate may undergo several modifications in patients with both ischemic and hemorrhagic stroke in fact raised blood pressure levels may lead to cerebral edema, hematoma expansion or hemorrhagic transformation and in contrast low blood pressure can lead to increased cerebral infarction or perihematomal ischemia. In addition, ECG abnormalities and cardiac arrhythmias, especially atrial fibrillation, are re…