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https://www.readbyqxmd.com/read/29783202/feasibility-of-myocardial-pet-imaging-using-a-benzylguanidine-analog-meta-3-18-f-fluoropropyl-benzylguanidine-18-f-mfpbg
#1
Sang-Keun Woo, Byung Seok Moon, Bom Sahn Kim, Min Hwan Kim, Yong Jin Lee, Jae Ho Jung, Kyo Chul Lee, Youngho Seo, Wook Kim, Sang Moo Lim, Byung Chul Lee, Sang Eun Kim
INTRODUCTION: Global and regional sympathetic activity in the heart can be evaluated using [123 I]meta-iodobenzylguanidine ([123 I]mIBG) imaging. However, [123 I]mIBG is associated with low image spatial resolution and sensitivity in cardiac imaging. We investigated the capability of an F-18-labeled mIBG derivative, meta-(3-[18 F]fluoropropyl)benzylguanidine ([18 F]mFPBG), for identifying ischemic and viable myocardium in a rat model of myocardial infarction. MATERIALS AND METHODS: The ex vivo biodistribution and in vivo metabolic stability of [18 F]mFPBG were investigated in Sprague-Dawley rats...
May 3, 2018: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/29782862/evaluation-of-cardiac-arrhythmic-risks-using-a-rabbit-model-of-left-ventricular-systolic-dysfunction
#2
Bianca Hemmeryckx, Yuanbo Feng, Liesbeth Frederix, Marleen Lox, Sander Trenson, Rob Vreeken, Hua Rong Lu, David Gallacher, Yicheng Ni, H Roger Lijnen
Patients with heart disease have a higher risk to develop cardiac arrhythmias, either spontaneously or drug-induced. In this study, we have used a rabbit model of myocardial infarction (MI) with severe left ventricular systolic dysfunction (LVSD) to study potential drug-induced cardiac risks with N-(piperidin-2-ylmethyl)-2,5-bis(2,2,2-trifluoroethoxy)benzamide (flecainide). Upon ligation of the left circumflex arteries, male New Zealand White rabbits developed a large MI and moderate or severe LVSD 7 weeks after surgery, in comparison to SHAM-operated animals...
May 18, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29782250/-effect-of-right-ventricular-myocardial-contractility-on-the-response-to-cardiac-resynchronization-therapy
#3
D I Lebedev, S V Popov, A I Mishkina, M V Lebedeva
AIM: To determine the effect of right ventricular myocardial contractility on the response to cardiac resynchronization therapy (CRT). MATERIALS AND METHODS: The study included 80 patients (49 men, mean age 54±10.5) diagnosed with dilated cardiomyopathy, complete left bundle branch block, and the QRS complex width 146 to 240 ms (183±32 ms). Heart failure was NYHA FC III, ejection fraction (EF) - 30.1±3.8 %, 6‑min walk test - 290.5±64.3 m, and end-diastolic volume (EDV) - 220...
2018: Kardiologiia
https://www.readbyqxmd.com/read/29781518/an-interesting-case-of-wide-qrs-tachycardia-with-right-bundle-branch-block-morphology-what-is-the-mechanism
#4
Krishna Kumar Mohanan Nair, Narayanan Namboodiri, Hiren Kevadiya, Ajitkumar Valaparambil
A 30 year old gentleman with no structural heart disease has been evaluated for paroxysmal palpitation with documented regular wide QRS tachycardia that has not responded to IV adenosine. Surface electrocardiogram has not shown any pre-excitation. He has been taken for an EP study after informed consent. Diagnostic catheters were placed at coronary sinus (CS), His bundle region and right ventricle (RV). During catheter manipulation a regular wide QRS tachycardia with right bundle branch block morphology (RBBB) with a tachycardia cycle length (TCL) of 400 ms and normal QRS axis similar to the clinical tachycardia got induced (Fig:1)...
May 21, 2018: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29780077/the-effect-of-remifentanil-on-the-minimum-alveolar-concentration-mac-and-mac-derivatives-of-sevoflurane-in-dogs
#5
Yusuke Murahata, Yoshiaki Hikasa, Sho Hayashi, Koki Shigematsu, Natsuki Akashi, Tomohiro Osaki, Takeshi Tsuka, Yoshiharu Okamoto, Tomohiro Imagawa
Remifentanil is an ultra-short-acting μ-opioid receptor agonist. The purpose of this study was to determine the relationship of the minimum alveolar concentration (MAC) of sevoflurane and other MAC derivatives, including the MAC for blocking adrenergic responses (MAC-BAR) and the MAC at which tracheal extubation is occurred (MAC-extubation), with or without remifentanil infusion. Six healthy adult beagle dogs were randomly anesthetized three times for determining the MAC-BAR (SEVMAC-BAR ), MAC (SEVMAC ), and MAC- extubation (SEVMAC-extubation ) of sevoflurane under infusion of saline and remifentanil at rates of 0...
May 21, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29779522/sinus-tachycardia-presenting-as-a-wide-and-narrow-complex-tachyarrhythmia-what-is-the-link
#6
Chenni S Sriram, Mario D Gonzalez
We describe a neonate that developed alternating wide and narrow complex tachycardias following heart surgery for congenital heart defect. Although the etiology was sinus tachycardia, a premature atrial complex initiated aberrancy due to phase 3 block that was perpetuated due to 'linking' at similar or even slower heart rates. Similarly, there was abrupt transition from wide to narrow complex tachycardia following a premature ventricular complex without a change in subsequent heart rate. This was explained by interruption of linking phenomenon by premature ventricular activation...
May 2018: Journal of Electrocardiology
https://www.readbyqxmd.com/read/29778339/lower-risk-of-postoperative-arrhythmias-in-congenital-heart-surgery-following-intraoperative-administration-of-magnesium
#7
Dingchao He, Nimisha Aggarwal, David Zurakowski, Richard A Jonas, Charles I Berul, Sridhar Hanumanthaiah, Jeffrey P Moak
OBJECTIVES: Postoperative arrhythmias are common in children undergoing congenital heart surgery. We evaluated whether intraoperative administration of magnesium was associated with a reduced occurrence of specific postoperative arrhythmias, as has been described previously, or had a broader effect on multiple arrhythmia types, and whether there existed a dose-effect of intraoperative magnesium. METHODS: We used a historical prospective observational cohort study...
April 18, 2018: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29778237/prevalence-temporal-evolution-and-impact-on-survival-of-ventricular-conduction-blocks-in-patients-with-acute-coronary-syndrome-and-cardiogenic-shock
#8
Heli Tolppanen, Tuija Javanainen, Jordi Sans-Rosello, Jiri Parenica, Tuomo Nieminen, Marie Pavlusova, Josep Masip, Lars Köber, Marek Banaszewski, Alessandro Sionis, Jindrich Spinar, Veli-Pekka Harjola, Raija Jurkko, Johan Lassus
Changes in QRS duration and pattern are regarded to reflect severe ischemia in acute coronary syndromes (ACS), and ventricular conduction blocks (VCBs) are recognized high-risk markers in both ACS and acute heart failure. Our aim was to evaluate the prevalence, temporal evolution, association with clinical and angiographic parameters, and impact on mortality of VCBs in ACS-related cardiogenic shock (CS). Data of 199 patients with ACS-related CS from a prospective multinational cohort were evaluated with electrocardiogram data from baseline and day 3...
April 20, 2018: American Journal of Cardiology
https://www.readbyqxmd.com/read/29775473/na-k-atpase-signaling-mediates-mir-29b-3p-regulation-and-cardiac-fibrosis-formation-in-mice-with-chronic-kidney-disease
#9
Christopher A Drummond, Xiaoming Fan, Steven T Haller, David J Kennedy, Jiang Liu, Jiang Tian
The Na/K-ATPase is an important membrane ion transporter and a signaling receptor that is essential for maintaining normal cell function. The current study examined the role of Na/K-ATPase signaling in regulating miR-29b-3p, an anti-fibrotic microRNA, in a mouse chronic kidney disease (CKD) model (5/6th partial nephrectomy or PNx). The results showed that CKD induced significant reduction of miR-29b-3p expression in the heart tissue by activation of Src and NFκB signaling in these animals. To demonstrate the role of Na/K-ATPase signaling, we also performed the PNx surgery on Na/K-ATPase α1 heterozygous (α1+/-) mice, which expresses ~40% less Na/K-ATPase α1 compared to their wild type littermates (WT) and exhibits deficiency in Na/K-ATPase signaling...
2018: PloS One
https://www.readbyqxmd.com/read/29775412/inhibitor-of-lysyl-oxidase-improves-cardiac-function-and-the-collagen-mmp-profile-in-response-to-volume-overload
#10
Elia C El Hajj, Milad C El Hajj, Van K Ninh, Jason D Gardner
The cardiac extracellular matrix is a complex architectural network that serves many functions including providing structural and biochemical support to surrounding cells, and regulating intercellular signaling pathways. Cardiac function is directly affected by extracellular matrix (ECM) composition, and alterations of the ECM contribute to progression of heart failure. Initially, collagen deposition is an adaptive response that aims to preserve tissue integrity and maintain normal ventricular function. However, the synergistic effects of the pro-inflammatory and pro-fibrotic responses induce a vicious cycle which causes excess activation of myofibroblasts, significantly increasing collagen deposition and accumulation in the matrix...
May 18, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29774208/long-term-outcome-of-transcatheter-device-closure-of-perimembranous-ventricular-septal-defects
#11
Krishna D Mandal, Danyan Su, Yusheng Pang
Background: Ventricular septal defect is a common congenital heart defect. Transcatheter closure of perimembranous ventricular septal defect (pmVSD) is an effective method alternative to surgical closure. The aim of the study is to evaluate the procedural result, early and long-term follow-up outcome of transcatheter closure of pmVSD. Methods: From January 2005 to December 2016, we retrospectively identified the patients who underwent transcatheter device closure of pmVSD. All patients underwent transthoracic echocardiography (TTE) and electrocardiogram (ECG) before and after the procedure...
2018: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29771714/remifentanil-induces-cardio-protection-against-ischemia-reperfusion-injury-by-inhibiting-endoplasmic-reticulum-stress-through-the-maintenance-of-zinc-homeostasis
#12
Mingwei Sheng, Ge Zhang, Jiannan Wang, Qing Yang, Huanhuan Zhao, Xinxin Cheng, Zhelong Xu
BACKGROUND: Although it is well known that remifentanil (Rem) elicits cardiac protection against ischemia/reperfusion (I/R) injury, the underlying mechanism remains unclear. This study tested if Rem can protect the heart from I/R injury by inhibiting endoplasmic reticulum (ER) stress through the maintenance of zinc (Zn) homeostasis. METHODS: Isolated rat hearts were subjected to 30 minutes of regional ischemia followed by 2 hours of reperfusion. Rem was given by 3 consecutive 5-minute infusions, and each infusion was followed by a 5-minute drug-free perfusion before ischemia...
May 15, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29771311/pathobiology-of-cardiac-dyssynchrony-and-resynchronization-therapy
#13
Uyên Châu Nguyên, Nienke J Verzaal, Frans A van Nieuwenhoven, Kevin Vernooy, Frits W Prinzen
Synchronous ventricular electrical activation is a prerequisite for adequate left ventricular (LV) systolic function. Conduction abnormalities such as left bundle branch block, and ventricular pacing lead to a dyssynchronous electrical activation sequence, which may have deleterious consequences. The present review attempts to connect the various processes involved in the development of 'dyssynchronopathy', and its correction by cardiac resynchronization therapy (CRT). Abnormal electrical impulse conduction leads to abnormal contraction, characterized by regional differences in timing as well as shortening patterns and amount of external work performed...
May 15, 2018: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29770986/the-influence-of-binding-site-geometry-on-anion-binding-selectivity-a-case-study-of-macrocyclic-receptors-built-on-an-azulene-skeleton
#14
Dawid Lichosyt, Sylwia Wasiłek, Paweł Dydio, Janusz Jurczak
The understanding of the host-guest interactions lies at the very heart of supramolecular chemistry. Often a minute change to the structure of a receptor can have a dramatic impact on the binding selectivity. Herein, we studied the influence of small perturbations in biding site geometry for a series of five closely correlated macrocyclic tetra-amide receptors, constructed from building blocks out of a pool of azulene-based units. The solid-state structures revealed that the conformational preferences of the free receptors are driven by the inherent preferences of the building blocks, yet in some cases the macrocyclic topology is able to override these to promote pre-organized conformations favorable for anion binding...
May 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29769800/the-therapeutic-potential-of-blocking-galectin-3-expression-in-acute-myocardial-infarction-and-mitigating-inflammation-of-infarct-region-a-clinical-outcome-based-translational-study
#15
Wassim Mosleh, Milind R Chaudhari, Swati Sonkawade, Supriya Mahajan, Charl Khalil, Kevin Frodey, Tanvi Shah, Suraj Dahal, Roshan Karki, Rujuta Katkar, W Matthijs Blankesteijn, Brian Page, Saraswati Pokharel, Minhyung Kim, Umesh C Sharma
Introduction: Increased galectin-3 is associated with ischemic cardiomyopathy, although its role in early remodeling post-myocardial infarction (MI) has not been fully elucidated. There are no data demonstrating that blocking galectin-3 expression would have an impact on the heart and that its relationship to remodeling is not simply an epiphenomenon. The direct association between galectin-3 and myocardial inflammation, dysfunction, and adverse cardiovascular outcomes post-MI was examined using clinical and translational studies...
2018: Biomarker Insights
https://www.readbyqxmd.com/read/29769505/efficacy-of-0-5-hyperbaric-bupivacaine-with-dexamethasone-versus-0-5-hyperbaric-bupivacaine-alone-in-spinal-anaesthesia-for-patient-undergoing-lower-abdominal-urological-and-lower-limb-orthopedic-surgeries
#16
M M Haque, M A Aleem, F H Haque, A B Siddique, R Afrose
Spinal anaesthesia with local anaesthetics has limited duration. Different additives have been used to prolong spinal anaesthesia. The aim of this study was to determine the efficacy of adding dexamethasone to bupivacaine in spinal anaesthesia specially whether it would prolong the duration of sensory block/ surgical analgesia and post-operative analgesia/pain free period or not. This randomized, prospective, double-blind, clinical study was conducted in the Department of Anaesthesia, Analgesia and Critical Care of Combined Military Hospital, Chittagong from October 2016 to August 2017...
April 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29767811/peripartum-cardiomyopathy
#17
T Koenig, D Hilfiker-Kleiner, J Bauersachs
Peripartum cardiomyopathy (PPCM) is a rare and potentially life-threatening disease that occurs toward the end of pregnancy or in the months following delivery in previously heart-healthy women. The incidence varies widely depending on geographical region and ethnic background, with an estimated number of 1 in 1000-1500 pregnancies in Germany. The course of the disease ranges from mild forms with minor symptoms to severe forms with acute heart failure and cardiogenic shock. The understanding of the etiology of PPCM has evolved in recent years...
May 16, 2018: Herz
https://www.readbyqxmd.com/read/29765477/detecting-epileptic-seizure-with-different-feature-extracting-strategies-using-robust-machine-learning-classification-techniques-by-applying-advance-parameter-optimization-approach
#18
Lal Hussain
Epilepsy is a neurological disorder produced due to abnormal excitability of neurons in the brain. The research reveals that brain activity is monitored through electroencephalogram (EEG) of patients suffered from seizure to detect the epileptic seizure. The performance of EEG detection based epilepsy require feature extracting strategies. In this research, we have extracted varying features extracting strategies based on time and frequency domain characteristics, nonlinear, wavelet based entropy and few statistical features...
June 2018: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29760703/the-increased-endogenous-sulfur-dioxide-acts-as-a-compensatory-mechanism-for-the-downregulated-endogenous-hydrogen-sulfide-pathway-in-the-endothelial-cell-inflammation
#19
Da Zhang, Xiuli Wang, Xiaoyu Tian, Lulu Zhang, Guosheng Yang, Yinghong Tao, Chen Liang, Kun Li, Xiaoqi Yu, Xinjing Tang, Chaoshu Tang, Jing Zhou, Wei Kong, Junbao Du, Yaqian Huang, Hongfang Jin
Endogenous hydrogen sulfide (H2 S) and sulfur dioxide (SO2 ) are regarded as important regulators to control endothelial cell function and protect endothelial cell against various injuries. In our present study, we aimed to investigate the effect of endogenous H2 S on the SO2 generation in the endothelial cells and explore its significance in the endothelial inflammation in vitro and in vivo . The human umbilical vein endothelial cell (HUVEC) line (EA.hy926), primary HUVECs, primary rat pulmonary artery endothelial cells (RPAECs), and purified aspartate aminotransferase (AAT) protein from pig heart were used for in vitro experiments...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29759839/short-lasting-episodes-of-torsade-de-pointes-in-the-chronic-atrioventricular-block-dog-model-have-a-focal-mechanism-while-longer-lasting-episodes-are-maintained-by-re-entry
#20
Nele Vandersickel, Alexandre Bossu, Jan De Neve, Albert Dunnink, Veronique M F Meijborg, Marcel A G van der Heyden, Jet D M Beekman, Jacques M T De Bakker, Marc A Vos, Alexander V Panfilov
OBJECTIVES: This study investigated the arrhythmogenic mechanisms responsible for torsade de pointes (TdP) in the chronic atrioventricular block dog model, known for its high susceptibility for TdP. BACKGROUND: The mechanism of TdP arrhythmias has been under debate for many years. Focal activity as well as re-entry have both been mentioned in the initiation and the perpetuation of TdP. METHODS: In 5 TdP-sensitive chronic atrioventricular block dogs, 56 needle electrodes were evenly distributed transmurally to record 240 unipolar local electrograms simultaneously...
December 26, 2017: JACC. Clinical Electrophysiology
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