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Cardiac patch

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https://www.readbyqxmd.com/read/28805824/flexible-shape-memory-scaffold-for-minimally-invasive-delivery-of-functional-tissues
#1
Miles Montgomery, Samad Ahadian, Locke Davenport Huyer, Mauro Lo Rito, Robert A Civitarese, Rachel D Vanderlaan, Jun Wu, Lewis A Reis, Abdul Momen, Saeed Akbari, Aric Pahnke, Ren-Ke Li, Christopher A Caldarone, Milica Radisic
Despite great progress in engineering functional tissues for organ repair, including the heart, an invasive surgical approach is still required for their implantation. Here, we designed an elastic and microfabricated scaffold using a biodegradable polymer (poly(octamethylene maleate (anhydride) citrate)) for functional tissue delivery via injection. The scaffold's shape memory was due to the microfabricated lattice design. Scaffolds and cardiac patches (1 cm × 1 cm) were delivered through an orifice as small as 1 mm, recovering their initial shape following injection without affecting cardiomyocyte viability and function...
August 14, 2017: Nature Materials
https://www.readbyqxmd.com/read/28800884/ionic-mechanisms-of-the-action-of-anaesthetics-on-sinoatrial-node-automaticity
#2
REVIEW
Akiko Kojima, Hiroshi Matsuura
Although various general anaesthetics affect the heart rate in clinical settings, their precise mechanisms remain to be fully elucidated. Because the heart rate is determined by automaticity of the cardiac pacemaker sinoatrial node and its regulation by autonomic nervous system, it is important to clarify the effect of anaesthetics on sinoatrial node automaticity. The spontaneous electrical activity of sinoatrial node is generated by a complex but coordinated interaction of multiple ionic currents, such as the hyperpolarisation-activated cation current (If), T-type and L-type Ca(2+) currents (ICa,T and ICa,L), Na(+)/Ca(2+) exchange current (INCX), and rapidly and slowly activating delayed rectifier K(+) currents (IKr and IKs)...
August 8, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28797681/extranodal-rosai-dorfman-disease-arising-in-the-heart-clinical-course-and-review-of-literature
#3
Amin Heidarian, Ayesha Anwar, M A Haseeb, Raavi Gupta
Rosai-Dorfman disease (RDD), also known as sinus histiocytosis with massive lymphadenopathy, is a nonmalignant disease of unknown etiology. It may present as bilateral, massive, painless cervical lymphadenopathy; however, one third of the cases have extranodal involvement. Extranodal sites include soft tissue, skin, upper respiratory and gastrointestinal tracts, and central nervous system, with head and neck being the most common. Here we report a rare case of intracardiac RDD in a 46-year-old, African-American female who presented with worsening shortness of breath and fatigue for 7 weeks...
July 4, 2017: Cardiovascular Pathology: the Official Journal of the Society for Cardiovascular Pathology
https://www.readbyqxmd.com/read/28774384/overcoming-the-roadblocks-to-cardiac-cell-therapy-using-tissue-engineering
#4
REVIEW
Mounica Yanamandala, Wuqiang Zhu, Daniel J Garry, Timothy J Kamp, Joshua M Hare, Ho-Wook Jun, Young-Sup Yoon, Nenad Bursac, Sumanth D Prabhu, Gerald W Dorn, Roberto Bolli, Richard N Kitsis, Jianyi Zhang
Transplantations of various stem cells or their progeny have repeatedly improved cardiac performance in animal models of myocardial injury; however, the benefits observed in clinical trials have been generally less consistent. Some of the recognized challenges are poor engraftment of implanted cells and, in the case of human cardiomyocytes, functional immaturity and lack of electrical integration, leading to limited contribution to the heart's contractile activity and increased arrhythmogenic risks. Advances in tissue and genetic engineering techniques are expected to improve the survival and integration of transplanted cells, and to support structural, functional, and bioenergetic recovery of the recipient hearts...
August 8, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28772035/bioelectrical-signals-improve-cardiac-function-and-modify-gene-expression-of-extracellular-matrix-components
#5
Karin Macfelda, Barbara Kapeller, Alexander Holly, Bruno K Podesser, Udo Losert, Kersten Brandes, Peter Goettel, Johannes Mueller
AIMS: Beyond the influence of stimulating devices on cardiac excitation, their use in treating patients with heart failure has positive effects on the myocardium at the molecular level. Electrical signals can induce a wide spectrum of effects in living tissue. Therefore, we sought to determine whether applying electrical microcurrent directly to failing hearts leads to functional improvement. METHODS AND RESULTS: Sixteen male spontaneously hypertensive rats (SHRs) with heart failure underwent application of a patch electrode to the left ventricular epicardium and placement of a subcutaneous counter electrode...
August 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/28766834/transseptal-puncture-using-surgical-electrocautery-in-children-and-adults-with-and-without-complex-congenital-heart-disease
#6
Srinath T Gowda, Athar M Qureshi, Daniel Turner, Nitin Madan, Justin Weigand, Richard Lorber, Harinder R Singh
BACKGROUND: Atrial transseptal puncture (TSP) for cardiac catheterization procedures remain challenging in children and adults with complex congenital heart disease (CHD). OBJECTIVES: We sought to evaluate our experience using radiofrequency (RF) current via surgical electrocautery needle for TSP to facilitate diagnostic and interventional procedures. METHODS: Retrospective chart review of all patients (pts) who underwent TSP using RF energy (10-25 W) via surgical electrocautery from three centers from January 2011 to January 2017 were evaluated...
August 2, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28765943/acute-and-chronic-effects-of-taurine-magnesium-coordination-compound-on-cardiac-sodium-channel-nav1-5
#7
Lin Zhao, Xiao-Xu Yang, Yong-Qiang Yin, Hong Wu, Yi Kang, Jian-Shi Lou
It has been previously demonstrated that taurine magnesium coordination compound (TMCC) produces antiarrhythmic effects in vivo. The present study investigated the acute and chronic effect of TMCC on sodium channels in HEK cells stably expressing human cardiac Nav1.5 sodium channels. The current amplitude, activation and inactivation kinetics, recovery time from inactivation, and use‑dependent block of sodium channels were analyzed using the whole‑cell patch clamp technique. Western blotting was used to analyze Nav1...
July 31, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28763460/inhibitory-effects-and-mechanism-of-dihydroberberine-on-herg-channels-expressed-in-hek293-cells
#8
Dahai Yu, Lin Lv, Li Fang, Bo Zhang, Junnan Wang, Ge Zhan, Lei Zhao, Xin Zhao, Baoxin Li
The human ether-a-go-go-related gene (hERG) potassium channel conducts rapid delayed rectifier potassium currents (IKr) and contributes to phase III cardiac action potential repolarization. Drugs inhibit hERG channels by binding to aromatic residues in hERG helixes. Berberine (BBR) has multiple actions, and its hydrogenated derivative dihydroberberine (DHB) is a potential candidate for developing new drugs. Previous studies have demonstrated that BBR blocks hERG channels and prolongs action potential duration (APD)...
2017: PloS One
https://www.readbyqxmd.com/read/28748465/automated-patch-clamp-methods-for-the-herg-cardiac-potassium-channel
#9
Sylvie Houtmann, Brigitte Schombert, Camille Sanson, Michel Partiseti, G Andrees Bohme
The human Ether-a-go-go Related Gene (hERG) product has been identified as a central ion channel underlying both familial forms of elongated QT interval on the electrocardiogram and drug-induced elongation of the same QT segment. Indeed, reduced function of this potassium channel involved in the repolarization of the cardiac action potential can produce a type of life-threatening cardiac ventricular arrhythmias called Torsades de Pointes (TdP). Therefore, hERG inhibitory activity of newly synthetized molecules is a relevant structure-activity metric for compound prioritization and optimization in medicinal chemistry phases of drug discovery...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28740625/pulmonary-valve-replacement-in-patients-with-corrected-tetralogy-of-fallot
#10
Fotios M Mitropoulos, Meletios A Kanakis, Christos Ntellos, Constantinos Loukas, Periklis Davlouros, Theophili Kousi, Andrew C Chatzis
Introduction: Development of pulmonary insufficiency in patients with surgically corrected tetralogy of Fallot (TOF) may lead to severe right heart failure with serious consequences. We herein present our experience with pulmonary valve replacement (PVR) in these patients. Methods: From 2005-2013, 99 consecutive patients (71 males/28 females, mean age 38±8 years), underwent PVR after 7 to 40 (mean 29 ± 8) years from the initial correction. Seventy nine of the symptomatic patients presented in NYHA II, 14 in III and 2 in IV...
2017: Journal of Cardiovascular and Thoracic Research
https://www.readbyqxmd.com/read/28739325/d242n-a-kv7-1-lqts-mutation-uncovers-a-key-residue-for-iks-voltage-dependence
#11
Cristina Moreno, Anna Oliveras, Chiara Bartolucci, Carmen Muñoz, Alicia de la Cruz, Diego A Peraza, Juan R Gimeno, Mercedes Martín-Martínez, Stefano Severi, Antonio Felipe, Pier D Lambiase, Teresa Gonzalez, Carmen Valenzuela
KV7.1 and KCNE1 co-assemble to give rise to the IKs current, one of the most important repolarizing currents of the cardiac action potential. Its relevance is underscored by the identification of >500 mutations in KV7.1 and, at least, 36 in KCNE1, that cause Long QT Syndrome (LQTS). The aim of this study was to characterize the biophysical and cellular consequences of the D242N KV7.1 mutation associated with the LQTS. The mutation is located in the S4 transmembrane segment, within the voltage sensor of the KV7...
July 22, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28734073/differential-calcium-sensitivity-in-nav-1-5-mixed-syndrome-mutants
#12
Mena Abdelsayed, Alban-Elouen Baruteau, Karen Gibbs, Shubhayan Sanatani, Andrew D Krahn, Vincent Probst, Peter C Ruben
INTRODUCTION: Inherited arrhythmias may arise from mutations in the SCN5a gene, which encodes the cardiac voltage-gated sodium channel, NaV 1.5. Mutants in NaV 1.5 result in Brugada Syndrome (BrS1), Long-QT Syndrome (LQT3), or mixed syndromes (an overlap of BrS1/LQT3). Exercise is a potential arrhythmogenic trigger in mixed syndromes. We sought to determine the effects of elevated cytosolic calcium, common during exercise, in mixed syndrome NaV 1.5 mutants. METHODS: We used whole-cell patch-clamp to assess the biophysical properties of NaV 1...
July 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28730300/health-related-quality-of-life-in-paediatric-patients-with-congenital-heart-defects-association-with-the-type-of-heart-defect-and-the-surgical-technique
#13
A Heusch, H J Kahl, K O Hensel, G Calaminus
The aim of the study was to investigate the impact of a number of surgical interventions for a various congenital cardiac defects (CHDs) on self-reported HRQoL. METHODS: Patients who had received corrective surgery of several congenital heart defects (surgical VSD closure, Fallot, TGA after atrial or arterial switch or Fontan-type circulation for univentricular AV-connection) were interviewed in the office of their home peadiatric cardiologist. HRQoL in children along 7 dimensions was assessed using a standardised questionnaire (PEDQoL); information on the medical case history of each respondent was also collected...
July 20, 2017: Quality of Life Research
https://www.readbyqxmd.com/read/28728923/ruptured-sinus-of-valsalva-aneurysm-causing-acute-right-heart-and-hepatorenal-failure-requiring-urgent-surgery
#14
Benjamin Swinson, Robert Grant, Ekta Paw, Raibhan Yadav, Anand Iyer
A sinus of Valsalva aneurysm is a rare cardiac anomaly that may be congenital or acquired. Very rarely, they present with acute symptoms as a result of rupture into the cardiac chamber. If left untreated, they almost always result in deteriorating cardiac function. We report a patient presenting with acute right heart failure and hepatorenal syndrome requiring urgent surgery and double patch repair.
May 29, 2017: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28715377/creation-of-cardiac-tissue-exhibiting-mechanical-integration-of-spheroids-using-3d-bioprinting
#15
Chin Siang Ong, Takuma Fukunishi, Andrew Nashed, Adriana Blazeski, Huaitao Zhang, Samantha Hardy, Deborah DiSilvestre, Luca Vricella, John Conte, Leslie Tung, Gordon Tomaselli, Narutoshi Hibino
This protocol describes 3D bioprinting of cardiac tissue without the use of biomaterials, using only cells. Cardiomyocytes, endothelial cells and fibroblasts are first isolated, counted and mixed at desired cell ratios. They are co-cultured in individual wells in ultra-low attachment 96-well plates. Within 3 days, beating spheroids form. These spheroids are then picked up by a nozzle using vacuum suction and assembled on a needle array using a 3D bioprinter. The spheroids are then allowed to fuse on the needle array...
July 2, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28715122/feasibility-and-acceptability-of-a-telephone-and-face-to-face-delivered-counseling-intervention-for-smoking-cessation-in-dutch-patients-with-coronary-heart-disease
#16
Nadine Berndt, Lilian Lechner, Aart Mudde, Hein De Vries, Catherine Bolman
Intensive behavioral counseling interventions combined with nicotine replacement therapy have increased smoking abstinence rates in cardiac patients, but little is known about their feasibility when initiated upon hospital admission and continued post-discharge. The current study was an evaluation of the use, appreciation, and fidelity of two post-discharge counseling interventions designed for cardiac patients to quit smoking that differed in their delivery mode. In a controlled trial with cross-over randomization at the cardiac unit level, hospitalized smokers in eight cardiac units of eight Dutch hospitals were assigned either telephone counseling (n = 223) or nurse-administered face-to-face counseling (n = 157) using the Ask-Advise-Refer strategy...
July 17, 2017: Research in Nursing & Health
https://www.readbyqxmd.com/read/28712813/factors-affecting-operative-time-and-outcome-of-carotid-endarterectomy-in-the-vascular-quality-initiative
#17
Jennifer L Perri, Brian W Nolan, Philip P Goodney, Randall R DeMartino, Benjamin S Brooke, Shipra Arya, Mark F Conrad, Jack L Cronenwett
OBJECTIVE: Prior studies have suggested a relationship between operative (Op) time and outcome after major vascular procedures. This study analyzed factors associated with Op time and outcome after carotid endarterectomy (CEA) in the Vascular Quality Initiative (VQI) registry. METHODS: Elective, primary CEAs without high anatomic risk or concomitant procedures from 2012 to 2015 in the VQI were analyzed (N = 26,327, performed by 1188 surgeons from 249 centers). Multivariable analysis was used to identify patient, procedure, and surgeon factors associated with Op time and major adverse events (MAEs), categorized as either technical (ipsilateral stroke, cranial nerve injury, reoperation) or cardiac (myocardial infarction, congestive heart failure, dysrhythmia requiring treatment, surgical site infection, and death)...
July 13, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28711067/pa-6-inhibits-inward-rectifier-currents-carried-by-v93i-and-d172n-gain-of-function-kir2-1-channels-but-increases-channel-protein-expression
#18
Yuan Ji, Marlieke G Veldhuis, Jantien Zandvoort, Fee L Romunde, Marien J C Houtman, Karen Duran, Gijs van Haaften, Eva-Maria Zangerl-Plessl, Hiroki Takanari, Anna Stary-Weinzinger, Marcel A G van der Heyden
BACKGROUND: The inward rectifier potassium current IK1 contributes to a stable resting membrane potential and phase 3 repolarization of the cardiac action potential. KCNJ2 gain-of-function mutations V93I and D172N associate with increased IK1, short QT syndrome type 3 and congenital atrial fibrillation. Pentamidine-Analogue 6 (PA-6) is an efficient (IC50 = 14 nM with inside-out patch clamp methodology) and specific IK1 inhibitor that interacts with the cytoplasmic pore region of the KIR2...
July 15, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/28710467/human-ipsc-derived-cardiomyocytes-cultured-in-3d-engineered-heart-tissue-show-physiological-upstroke-velocity-and-sodium-current-density
#19
Marc D Lemoine, Ingra Mannhardt, Kaja Breckwoldt, Maksymilian Prondzynski, Frederik Flenner, Bärbel Ulmer, Marc N Hirt, Christiane Neuber, András Horváth, Benjamin Kloth, Hermann Reichenspurner, Stephan Willems, Arne Hansen, Thomas Eschenhagen, Torsten Christ
Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) are a promising tool for drug testing and modelling genetic disorders. Abnormally low upstroke velocity is a current limitation. Here we investigated the use of 3D engineered heart tissue (EHT) as a culture method with greater resemblance to human heart tissue in comparison to standard technique of 2D monolayer (ML) format. INa was measured in ML or EHT using the standard patch-clamp technique. INa density was ~1.8 fold larger in EHT (-18...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698169/effectiveness-of-digital-medicines-to-improve-clinical-outcomes-in-patients-with-uncontrolled-hypertension-and-type-2-diabetes-prospective-open-label-cluster-randomized-pilot-clinical-trial
#20
Juan Frias, Naunihal Virdi, Praveen Raja, Yoona Kim, George Savage, Lars Osterberg
BACKGROUND: Hypertension and type 2 diabetes mellitus are major modifiable risk factors for cardiac, cerebrovascular, and kidney diseases. Reasons for poor disease control include nonadherence, lack of patient engagement, and therapeutic inertia. OBJECTIVE: The aim of this study was to assess the impact on clinic-measured blood pressure (BP) and glycated hemoglobin (HbA1c) using a digital medicine offering (DMO) that measures medication ingestion adherence, physical activity, and rest using digital medicines (medication taken with ingestible sensor), wearable sensor patches, and a mobile device app...
July 11, 2017: Journal of Medical Internet Research
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