Skip to main content

Characterization of Atrial and Ventricular Structural Remodeling in a Porcine Model of Atrial Fibrillation Induced by Atrial Tachypacing.

BACKGROUND: Atrial fibrillation (AF) is characterized by electrical and structural remodeling. Irregular and / or rapid atrio-ventricular (AV) conduction during AF can result in AV dyssynchrony, tachymyopathy, pressure and volume overload with Rabbit Clia Kits subsequent dilatation, valve regurgitation, ventricular dysfunction and heart failure progresses.

Objective: To gain further insight into the pathophysiology of myocardial changes caused by tachypacing right atrium (A-TP) in a large animal model. 

Methods: A total of 28 pigs Landrace randomly as 14 to AF-induced group A-TP and 14 pigs for the control group. AF tachypaced pigs for 43 ± 4 days up in sustained AF. functional renovation investigated by echocardiography (after cardioversion to sinus rhythm). structural renovation was quantified by histological preparations with picrosirius red and immunohistochemical staining. Results: A-TP resulted in decreased left ventricular ejection fraction (LVEF) is accompanied by an increase in end diastolic and left atrial (LA) volume and end-systolic area. In addition, A-TP is associated with mitral valve (MV) regurgitation, diastolic dysfunction and increased atrial and ventricular fibrotic extracellular matrix (ECM). Conclusion: A-TP concurrent Induced AF with LV systolic and diastolic dysfunction, increased LA volume and area, and atrial and ventricular fibrosis.
Characterization of Atrial and Ventricular Structural Remodeling in a Porcine Model of Atrial Fibrillation Induced by Atrial Tachypacing.


MicroRNA Expression Profile Changes after Cardiopulmonary Bypass and ischemia / reperfusion-injury in a Porcine Model cardioplegic arrest.


Identification of microRNAs (miRNA) associated with cardiopulmonary bypass, heart attack and subsequent myocardial ischemia / reperfusion can uncover new therapeutic targets and biomarkers. The main objective of this study was to investigate the effects of cardiopulmonary bypass and cardioplegic arrest temperature on myocardial miRNA profile in left ventricular tissue of pigs. We employ next-generation sequencing to analyze the profile miRNA in the following groups: (1) heart was arrested with antegrade warm Hospital St Thomas No. 2 (STH2) cardioplegia (n = 5; STH2-warm, 37 ° C) and (2) cold STH2 ( n = 6; STH2-cold, 4 ° C) cardioplegia. sixty min of ischemia followed by 60 minutes of reperfusion on-pump with an additional 90 minutes of off-pump reperfusion. 

In addition, two groups without stopping the heart (off-pump and https://gentaur.us/ pump group; n = 3, respectively) served as additional controls. STH2 STH2-warm and cold cardioplegia showed no difference in hemodynamics. On the contrary, the coronary venous creatine kinase-myocardial band (CK-MB) levels significantly lowered in pigs receiving STH2-warm cardioplegia (p <0.05). principal component analysis revealed that the cardiopulmonary bypass and cardioplegic catch miRNAs highly influenced in left ventricular tissue. 

Thus, ssc-miR-122, ssc-miR-10a-5p, ssc-miR-193a-3p, ssc-miR-499-3p, ssc-miR-374a-5p, ssc-miR-345-5p , ssc- mir-142-3p, ssc-miR-424-5p, ssc-miR-545-3p, ssc-miR-30b-5p, ssc-miR-145-5p, ssc-miR-374b-5p and ssc-Mirza different 139-3p governed by cardiopulmonary bypass (false discovery rate (FDR) <0.05 compared to the off-pump group). However, only ssc-miR-451 were expressed differently between STH2-warm and cold STH2 (FDR <0.05).
Labels:

Comments

Post a Comment

Popular posts from this blog

In-situ tool wear monitoring and its effects on the performance of porcine cortical bone drilling: a comparative in-vitro investigation.

Drilling is one of the most widely used in orthopedic surgery and eye surgery the same drill used several times in the hospital. Using the same drill bit a few times  Canine Clia Kits might be the cause of osteosynthesis and osteonecrosis. In this work, the effect of repeated orthopedic little twist on disposable surgical instruments, power, torque, temperature and chip morphology during the drilling of the cortical bone of pigs was studied. The results were compared with the ultrasonic rotary drilling (RUD) on the same bones using hollow drill tools coated with diamond grains.  A sequence of 200 trials (100 by each process, RUD and CD) is performed with a constant process parameters.Wear in the drill area is significantly increased as a drill is used repeatedly in the CD, whereas no wear attritious found in diamond grains coated in results RUD .Comparative shows that the cutting force, torque and temperature increases as a function of the use of instruments on the CD as the ...
Post a Comment
Read more

Everolimus-Eluting Biodegradable Abluminal Coating Stent versus Durable Conformal Coating Stent: Termination of the Inflammatory Response Associated with Neointimal Healing in a Porcine Coronary Model.

We evaluated the effects of different carrier systems on early vascular response through histological analysis and electron microscopy using pig model.Although Synergy ™ and Promus PREMIER ™ share of identical material and drug elution stents (everolimus), they use a different drug carrier systems: biodegradable abluminal conformal coating durable  Cavia Clia Kits polymer or polymer layers, respectively. However, data regarding the impact of the different coating systems on the healing of the vessel is currently limited. Twelve Synergy ™ and Promus PREMIER ™ implanted in 12 pigs. histopathological analysis of the stented segment held on 2 and 14 days after implantation. morphometric analysis intima inflammation and fibrin content was also conducted. result On day 2, neointimal thickness, neointimal area percentage, and scores of inflammation and intimal fibrin content did not differ significantly between the two groups. On the 14th day, scores of inflammation and intimal fibrin c...
Post a Comment
Read more