Search results for "Flutter"
showing 10 items of 32 documents
Five-year follow-up after catheter ablation of persistent atrial fibrillation using the stepwise approach and prognostic factors for success.
2015
Background— In the meantime, catheter ablation is widely used for the treatment of persistent atrial fibrillation (AF). There is a paucity of data about long-term outcomes. This study evaluates (1) 5-year single and multiple procedure success and (2) prognostic factors for arrhythmia recurrences after catheter ablation of persistent AF using the stepwise approach aiming at AF termination. Methods and Results— A total of 549 patients with persistent AF underwent de novo catheter ablation using the stepwise approach (2007–2009). A total of 493 patients were included (Holter ECGs ≥every 6 months). Mean follow-up was 59±16 months with 2.1±1.1 procedures per patient. Single and multiple procedu…
Effect of intravenous flecainide on atrial vulnerability in man.
1985
Sixteen patients were investigated by means of programmed atrial stimulation at 2 different driving rates: 100/min and 120/min. All patients had an increased atrial vulnerability at both driving rates. After the administration of intravenous flecainide (1 mg/kg bodyweight as a bolus, followed by the same amount infused over a period of 20 minutes), the increased vulnerability was abolished in 11 and 9 patients, respectively. In the remaining patients the rate of induced atrial tachyarrhythmia decreased. These findings correlate with a significant prolongation of the effective refractory period of the right atrium and a corresponding significant shortening of its relative refractory period. …
Effect of intravenous flecainide on atrial vulnerability in man.
1983
Sixteen patients were investigated by means of programmed atrial stimulation at two different driving rates: 100 and 120/min. All patients had an increased atrial vulnerability at both driving rates. After intravenous flecainide application (1 mg/kg body weight as a bolus followed by the same amount given by infusion over a period of 20 min) the increased vulnerability was abolished in 11 and 9 patients respectively. In the remaining patients the rate of induced atrial tachyarrhythmia decreased. These findings correlate with a significant prolongation of the effective refractory period of the right atrium and a significant shortening of the relative refractory period of the right atrium. It…
Computational Analysis of the Active Control of Incompressible Airfoil Flutter Vibration Using a Piezoelectric V-Stack Actuator
2021
The flutter phenomenon is a potentially destructive aeroelastic vibration studied for the design of aircraft structures as it limits the flight envelope of the aircraft. The aim of this work is to propose a heuristic design of a piezoelectric actuator-based controller for flutter vibration suppression in order to extend the allowable speed range of the structure. Based on the numerical model of a three degrees of freedom (3DOF) airfoil and taking into account the FEM model of a V-stack piezoelectric actuator, a filtered PID controller is tuned using the population decline swarm optimizer PDSO algorithm, and gain scheduling (GS) of the controller parameters is used to make the control adapti…
A Strange Case of Left Bowel Ischemia after Right Hernioplasty
2010
We report the first observed case of a young man who suffered of large and unsuspected left bowel ischemia following an elective right open hernioplasty. A 54-year-old man had a 2-year history of right inguinal reducible mass and was admitted to hospital for an elective day case open inguinal hernioplasty for a direct right inguinal hernia. Apart from mild hypertension controlled with ACE inhibitor, he was medically fit and well. The patient was submitted to open tension-free mesh repair with polypropylene preshaped mesh with local infiltration anesthesia and additive sedation with midazolam. The local anesthesia and surgery were uneventful and he was discharged home on the same day as per …
Starpplatformu programmatūras izstrādes ietvaru pieeja mobilo lietotņu izveidei
2020
Ņemot vērā viedierīču arvien plašāko izmantošanu planētas iedzīvotāju ikdienā, mobilo lietotņu izstrādes bizness un lietotņu piedāvājums ir milzīgs, tāpēc arvien svarīgs kļūst jautājums par piemērotu tehnoloģiju izvēli lietotņu izveidē. Starp pieejamām tehnoloģijām ir gan tādas, kas ir nostabilizējušās un pastāv gadiem, gan salīdzinoši jaunas un attīstības fāzē esošas. Mobilo lietotņu izstrādātājam atbilstošas tehnoloģijas izvēle var būt nopietns uzdevums, kas potenciāli var novest pie problēmām projektam attīstoties. Darba mērķis ir izpētīt un pārbaudīt pēdējā laikā arvien populārāko starpplatformu ietvaru pieeju mobilo lietotņu izstrādē, īpaši fokusējoties uz jauno tehnoloģiju Flutter, ka…
Šķērsplatformu izstrādes rīku salīdzinājums mobilās lietojumprogrammas rakstīšanai
2020
Mobilo lietojumprogrammu tirgus strauji aug, tādēļ rādas liels pieprasījums pēc ātras augstas kvalitātes lietojumprogrammu izstrādes. Papildus vietējām izstrādes pieejām, kad lietojumprogrammu var izveidot tikai vienai konkrētai mobilajai platformai, savu popularitāti iegūst arī šķērsplatformu mobilās attīstības pieejas iegūst arvien lielāku popularitāti. Bakalaura darba mērķis ir izpētīt un sniegt vispārīgu pārskatu par dažiem pieejamiem šķērsplatformu izstrādes rīkiem, kā arī detalizēti analizēt divus izstrādes rīkus, lai sniegtu rīku salīdzināšanas rezultātus. Šī darba rezultātā, izmantojot vairākus ietvarus, ir izstrādātas četras vienas lapas lietotnes. Izvēlēto šķērsplatformu rīku anal…
Attālināts automašīnu monitorings, izmantojot lietu interneta un bezservera tehnoloģijas
2020
Ikvienā modernā automašīnā notiek milzīgs daudzums ar elektroniskiem un mehāniskiem procesiem, kas vajadzīgi, lai automašīna veiktu optimālu funkcionēšanu. Daļu no iekšējiem procesiem iespējams no ārpuses novērot, izmantojot automašīnu pašdiagnostikas sistēmu (OBD). Bakalaura darba mērķis ir izveidot risinājumu attālinātai OBD datu monitorēšanai. Darba ietvaros tiek izpētīts, kas ir vajadzīgs, lai pieslēgtos OBD. Kā notiek komunikācija ar OBD. Darba gaitā izstrādāta “Flutter” mobilā lietotne, kas, izmantojot “Bluetooth” zemās enerģijas tehnoloģiju, no automašīnas pašdiagnostikas sistēmas spēj iegūt aktuālos datus. Lietotne nolasītos datus nogādā “AWS Lambda” bezservera metodei, kas rezultāt…
Exome sequencing of a family with lone, autosomal dominant atrial flutter identifies a rare variation in ABCB4 significantly enriched in cases
2015
Background Lone atrial flutter (AFL) and atrial fibrillation (AF) are common and sometimes consequential cardiac conduction disorders with a strong heritability, as underlined by recent genome-wide association studies that identified genetic modifiers. Follow-up family-based genetic analysis also identified Mendelian transmission of disease alleles. Three affected members were exome-sequenced for the identification of potential causative mutations, which were subsequently validated by direct sequencing in the other 3 affected members. Taqman assay was then used to confirm the role of any mutation in an independent population of sporadic lone AFL/AF cases. Results The family cluster analysis…
Gold vs. platinum-iridium tip catheter for cavotricuspid isthmus ablation: the AURUM 8 study
2010
Aims Gold electrodes have the theoretical advantage of creating bigger lesions than platinum–iridium (Pt–Ir) electrodes. We performed a prospective randomized study to compare the clinical efficacy of standard 8 mm Pt–Ir tip catheter (control) and 8 mm gold-tip catheters in the ablation of the cavotricuspid isthmus (CTI)-dependent atrial flutter. Methods and results A total of 463 patients undergoing CTI ablation in 19 clinical centres were randomized to receive the treatment by gold-tip or control catheter. The primary endpoint was cumulative radiofrequency (RF) application duration until achieving bidirectional CTI block. It did not differ significantly for the two catheters. The gold-tip…