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Objective: To assess the arrhythmic safety profile of the adipose graft transposition procedure (AGTP) and its electrophysiological effects on post-myocardial infarction (MI) scar.
Background: Myocardial repair is a promising treatment for patients with MI. The AGTP is a cardiac reparative therapy that reduces infarct size and improves cardiac function. The impact of AGTP on arrhythmogenesis has not been addressed.
Methods: MI was induced in 20 swine. Contrast-enhanced magnetic resonance (ce-MRI), electrophysiological study (EPS), and left-ventricular endocardial high-density mapping were performed 15 days post-MI. Animals were randomized 1:1 to AGTP or sham-surgery group and monitored with ECG-Holter. Repeat EPS, endocardial mapping, and ce-MRI were performed 30 days post-intervention. Myocardial SERCA2, Connexin-43 (Cx43), Ryanodine receptor-2 (RyR2), and cardiac troponin-I (cTnI) gene and protein expression were evaluated.
Results: The AGTP group showed a significant reduction of the total infarct scar, border zone and dense scar mass by ce-MRI ( = 0.04), and a decreased total scar and border zone area in bipolar voltage mapping ( < 0.001). AGTP treatment significantly reduced the area of very-slow conduction velocity (<0.2 m/s) ( = 0.002), the number of deceleration zones ( = 0.029), and the area of fractionated electrograms ( = 0.005). No differences were detected in number of induced or spontaneous ventricular arrhythmias at EPS and Holter-monitoring. SERCA2, Cx43, and RyR2 gene expression were decreased in the infarct core of AGTP-treated animals ( = 0.021, = 0.018, = 0.051, respectively).
Conclusion: AGTP is a safe reparative therapy in terms of arrhythmic risk and provides additional protective effect against adverse electrophysiological remodeling in ischemic heart disease.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9530287 | PMC |
http://dx.doi.org/10.3389/fcvm.2022.983001 | DOI Listing |
Biol Psychol
December 2024
Institute of Cognition, Brain & Health, Henan University, Kaifeng, China; Institute of Psychology and Behavior, Henan University, Kaifeng, China. Electronic address:
Although previous studies have shown that both advisors' social status and confidence level affect advisees' advice-taking behavior, it is currently unclear the mechanisms of their common actions. Here, using event-related potentials, we investigated how both advisors' social status and confidence level independently or jointly influence advice-taking behavior. Specifically, participants were asked to make choices in a dot-estimation task and then they would receive high- and low-confidence advice from advisors with high- and low-status.
View Article and Find Full Text PDFVoltage-sensitive calcium channels contribute to depolarization of both motor- and interneurons in animal studies, but less is known of their contribution to human motor control and whether blocking them has potential in future antispasmodic treatment in humans. Therefore, this study investigated the acute effect of Nimodipine on the transmission of human spinal reflex pathways involved in spasticity. In a double-blinded, cross-over study, we measured soleus muscle stretch- and H-reflexes, and tibialis anterior cutaneous reflexes in nineteen healthy subjects before and after Nimodipine (tab-let 60mg) or Baclofen (tablet 25mg).
View Article and Find Full Text PDFBrain Res Bull
December 2024
Department of Physiology and Pathophysiology, Xi'an Jiaotong University School of Basic Medical Sciences, Shaanxi Engineering and Research Center of Vaccine, Key Laboratory of Environment and Genes Related to Diseases of Education Ministry of China, Xi'an 710061, China. Electronic address:
Neuromedin B (NMB) has potentially great impacts on the development of cardiovascular diseases by promoting hypertensive and sympatho-excitation effects. However, studies regarding the NMB function in paraventricular nucleus (PVN) are lacking. With selective neuromedin B receptor (NMBR) antagonist, BIM-23127, we aim to determine whether the blockade of NMB function in PVN could alleviate central inflammation and attenuate hypertensive responses.
View Article and Find Full Text PDFG Ital Cardiol (Rome)
January 2025
U.O.C. Cardiologia 1-Emodinamica, Dipartimento Cardiotoracovascolare "A. De Gasperis", ASST Grande Ospedale Metropolitano Niguarda, Milano.
Potassium is the most represented intracellular electrolyte in the human body. Its extracellular levels are maintained within strict limits through different mechanisms, which constitute the homeostasis of potassium. Hyperkalemia is the most common electrolyte disorder in patients with cardiovascular disease.
View Article and Find Full Text PDFCogn Neurodyn
December 2024
School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213159 China.
Electrophysiological properties of ion channels can influence the transport process of ions and the generation of firing patterns in an excitable biological neuron when applying an external stimulus and exceeding the excitable threshold. In this paper, a current stimulus is employed to emulate the external stimulus, and a second-order locally active memristor (LAM) is deployed to characterize the properties of ion channels. Then, a simple bionic circuit possessing the LAM, a capacitor, a DC voltage, and the current stimulus is constructed.
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