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https://www.readbyqxmd.com/read/28823052/sensitivity-analysis-of-ventricular-activation-and-electrocardiogram-in-tailored-models-of-heart-failure-patients
#1
C Sánchez, G D'Ambrosio, F Maffessanti, E G Caiani, F W Prinzen, R Krause, A Auricchio, M Potse
Cardiac resynchronization therapy is not effective in a variable proportion of heart failure patients. An accurate knowledge of each patient's electroanatomical features could be helpful to determine the most appropriate treatment. The goal of this study was to analyze and quantify the sensitivity of left ventricular (LV) activation and the electrocardiogram (ECG) to changes in 39 parameters used to tune realistic anatomical-electrophysiological models of the heart. Electrical activity in the ventricles was simulated using a reaction-diffusion equation...
August 19, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28822967/temporal-dynamics-of-cardiac-hypertrophic-growth-in-response-to-pressure-overload
#2
Yuan Wang, Yuannyu Zhang, Guanqiao Ding, Herman May, Jian Xu, Thomas G Gillette, Hang Wang, Zhao V Wang
Hypertension is one of the most important risk factors of heart failure. In response to high blood pressure, the left ventricle manifests hypertrophic growth to ameliorate wall stress, which may progress into decompensation and trigger pathological cardiac remodeling. Despite the clinical importance, the temporal dynamics of pathological cardiac growth remains elusive. Here, we took advantage of the puromycin labeling approach to measure the relative rates of protein synthesis as a way to delineate the temporal regulation of cardiac hypertrophic growth...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28822966/inhibitory-actions-of-the-nrg-1-erbb4-pathway-in-macrophages-during-tissue-fibrosis-in-heart-skin-and-lung
#3
Zarha Vermeulen, Anne-Sophie Hervent, Lindsey Dugaucquier, Leni Vandekerckhove, Miche Rombouts, Matthias Beyens, Dorien M Schrijvers, Guido R Y De Meyer, Stuart Maudsley, Gilles W De Keulenaer, Vincent Fm Segers
The neuregulin-1 (NRG-1)/ErbB system is an endothelium-controlled paracrine system modulating cardiac performance and adaptation. Recent studies indicate that NRG-1 has anti-fibrotic effects in the left ventricle (LV), which were explained by direct actions on cardiac fibroblasts. However, the NRG-1/ErbB system also regulates the function of macrophages. In this study, we hypothesized that the anti-fibrotic effect of NRG-1 in the heart is at least partially mediated through inhibitory effects on macrophages...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28822963/%C3%AE-1a-subtype-adrenergic-agonist-therapy-for-failing-right-ventricle
#4
Patrick M Cowley, Guan-Ying Wang, Sunil K Joshi, Philip M Swigart, David H Lovett, Paul C Simpson, Anthony J Baker
Failure of the right ventricle (RV) is a serious disease with a poor prognosis and limited treatment options. Signaling by α1-adrenergic receptors (α1-ARs), in particular the α1A-subtype, mediate cardioprotective effects in multiple heart failure models. Recent studies show that chronic treatment with the α1A-subtype agonist A61603 improves function and survival in a model of LV failure. The goal of this study was to determine if chronic A61603 treatment is beneficial in a RV failure model. We used tracheal instillation of the fibrogenic antibiotic bleomycin in mice to induce pulmonary fibrosis, pulmonary hypertension, and RV failure within 2 wk...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28822687/right-ventricular-infarction
#5
REVIEW
Vinod Namana, Sushilkumar Satish Gupta, Anna A Abbasi, Hitesh Raheja, Jacob Shani, Gerald Hollander
Coronary Heart Disease is a leading cause of morbidity and mortality worldwide. A great amount is known about left ventricular myocardial infarction. It was not until much later (1974) that right ventricular myocardial infarction was studied as a separate entity. Isolated right ventricle myocardial infarction is rare. Around one-third of patients with acute infero-posterior ST-segment elevation myocardial infarction, will present with concomitant right ventricular infraction. The aim of this paper is to review the literature on the importance of early recognition of right ventricular infarction, clinical presentation, pathophysiology, diagnostic evaluation, differential diagnosis, treatment, complications and prognosis...
July 14, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28821330/systemic-atrioventricular-valve-excision-and-ventricular-assist-devices-in-pediatric-patients
#6
Deipanjan Nandi, Kelley D Miller, Carley M Bober, Tami M Rosenthal, Lisa M Montenegro, Joseph W Rossano, J William Gaynor, Christopher E Mascio
BACKGROUND: Continuous-flow ventricular assist devices (CF VADs) designed for adults are increasingly used in pediatric patients. However, there is greater risk of device inflow obstruction as a result of size and anatomy. METHODS: We reviewed all cases of systemic atrioventricular valve (AVV) excision with HeartWare HVAD (HeartWare, Framingham, MA) implantation in the systemic ventricle performed at our institution from November 2015 to May 2016. RESULTS: AVV excision with CF VAD implantation was undertaken in 3 patients...
August 16, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28821295/coexistence-of-congenital-left-ventricular-aneurysm-and-prominent-left-ventricular-trabeculation-in-a-patient-with-ldb3-mutation-a-case-report
#7
Shengshuai Shan, Xiaoxiao He, Lin He, Min Wang, Chengyun Liu
BACKGROUND: The coexistence of congenital left ventricular aneurysm and abnormal cardiac trabeculation with gene mutation has not been reported previously. Here, we report a case of coexisting congenital left ventricular aneurysm and prominent left ventricular trabeculation in a patient with LIM domain binding 3 gene mutation. CASE PRESENTATION: A 30-year-old Asian man showed paroxysmal sinus tachycardia and Q waves in an electrocardiogram health check. There were no specific findings in physical examinations and serological tests...
August 19, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28820558/young-patient-with-advanced-heart-failure-no-longer-a-candidate-for-heart-transplantation-after-mitraclip%C3%A3-%C3%A2-procedure
#8
Cosmo Godino, Andrea Scotti, Eustachio Agricola, Carlo A Pivato, Mauro Chiarito, Stefano Stella, Massimo Maccherini, Alberto Margonato, Antonio Colombo
In Europe, mitral regurgitation (MR) is the second most common form of valvular heart disease requiring surgical treatment. The case is presented of a 36-year-old woman with end-stage heart failure secondary to chemotherapy-induced cardiotoxicity, complicated by severe MR. She was listed for heart transplantation and underwent percutaneous MitraClip® implantation in order to preclude further clinical deterioration while awaiting a suitable donor. The one-year follow-up showed a strong improvement of symptoms and mostly reverse left ventricular remodelling, with consequent removal from the heart transplantation list...
March 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28820556/unusual-locations-for-cardiac-papillary-fibroelastomas
#9
Davide Carino, Francesco Nicolini, Alberto Molardi, Clara Indira Dadamo, Tiziano Gherli
Papillary fibroelastomas (PFEs) are rare and benign cardiac tumors which usually are localized on the valves (mostly on the aortic valve), though they may originate also from the ventricles or atrial walls. Whilst, in the large majority of cases, these lesions are asymptomatic they may cause serious complications such as thromboembolic events, or more rarely valvular dysfunctions. Surgical excision is necessary for a symptomatic lesion. The management of asymptomatic lesions is not defined. Herein are reported the details of a miniseries of six cases operated on at the authors' institution between 2005 and 2015...
March 2017: Journal of Heart Valve Disease
https://www.readbyqxmd.com/read/28820225/bilateral-thalamic-edema-from-coexisting-choroid-plexus-arteriovenous-malformation-and-sinus-thrombosis-case-report
#10
Ryan B Kochanski, Andrew K Johnson, Roham Moftakhar
Bilateral thalamic dysfunction secondary to venous congestion may result from either venous sinus thrombosis or high flow arteriovenous malformations or a combination of both. We present a case of bilateral thalamic edema resulting from concomitant choroid plexus arteriovenous malformation (AVM) and straight sinus thrombosis and describe our treatment approach. The patient presented with several weeks of progressive confusion and memory deficits. Magnetic resonance imaging and venography (MRI/ MRV) showed bilateral thalamic T2 hyperintensities and straight sinus thrombosis...
2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/28820034/the-value-of-adding-sub-valvular-procedures-for-chronic-ischemic-mitral-regurgitation-surgery-a-meta-analysis
#11
Marco Moscarelli, Thanos Athanasiou, Giuseppe Speziale, Prakash P Punjabi, George Malietzis, Patrizio Lancellotti, Khalil Fattouch
BACKGROUND: The most performed repair technique for the treatment of chronic ischemic mitral regurgitation in patients referred for bypass grafting remains restricted annuloplasty. However, it is associated with a high rate of failure, especially if severe tenting exists. OBJECTIVES: To understand if adjunctive sub-valvular mitral procedures may provide better repair performance. METHODS: A systematic literature review identified six studies of which five fulfilled the criteria for meta-analysis...
September 2017: Perfusion
https://www.readbyqxmd.com/read/28819680/quantitative-approach-to-the-posterior-cranial-fossa-and-craniocervical-junction-in-asymptomatic-children-with-achondroplasia
#12
Rosalinda Calandrelli, Marco Panfili, Gabriella D'Apolito, Giuseppe Zampino, Alessandro Pedicelli, Fabio Pilato, Cesare Colosimo
PURPOSE: We propose an magnetic resonance imaging (MRI)-based quantitative morphovolumetric approach to the posterior cranial fossa (PCF) and craniocervical junction (CCJ) changes in achondroplastic patients investigating possible associations with ventriculomegaly and medullary compression. METHODS: We analyzed MRI of 13 achondroplastic children not treated by surgery. 3D FSPGR T1-weighted images were used to analyze (1) PCF synchondroses; (2) PCF volume (PCFV), PCF brain volume (PCFBV), PCFV/PCFBV ratio, cerebellar volume, cerebrospinal fluid (CSF) spaces volume, and IV ventricle volume; (3) PCF (clivus, supraocciput, exocciput lengths, tentorial angle) and CCJ (AP and LL diameters of foramen magnum (FM)) morphometry; (4) measurements of FM and jugular foramina (JF) areas; and (5) supratentorial ventricular volume...
August 17, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28818352/longitudinal-sequential-biventricular-assessment-in-adults-with-transposition-of-the-great-arteries-and-relationship-with-adverse-outcomes
#13
M Riahi, A Claman, M Kiess, M Orgad, D Human, S Chakrabarti, J Leipsic, J Grewal
BACKGROUND: In a cohort of congenitally corrected transposition of the great arteries (cc-TGA) and transposition of the great arteries after atrial switch procedure (d-TGA) the study objectives were: 1) to assess the change of quantitative systemic right ventricle (sRV) parameters over time and; 2) to examine the relationship of quantitative sRV parameters with adverse clinical outcomes. METHODS AND RESULTS: Single-center cohort study that included 49 (39%) cc-TGA and 76 (61%) d-TGA patients >18years who had at least one MUGA sRV assessment, 18/39 had more than one respectively...
August 5, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28818266/microrna-93-elevation-after-myocardial-infarction-is-cardiac-protective
#14
Kai Li, Tao Lin, Lingdan Chen, Neng Wang
Coronary Artery Disease (CAD) is one of the most serious diseases that endangers human health worldwide, myocardial infarction (MI) is an acute form of CAD. Recent developments in MI therapies have resulted in significant reductions in mortality. However, subsequent chronic congestive heart failure and ventricle remodeling plagues an increasing number of MI patients. MicroRNAs (miR) have been reported to be involved in the process of cardiac remodeling, a recent study shows that miR-93 is elevated in the blood of CAD patients...
September 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28818204/geometry-as-a-confounder-when-assessing-ventricular-systolic-function-comparison-between-ejection-fraction-and-strain
#15
Thomas M Stokke, Nina E Hasselberg, Marit K Smedsrud, Sebastian I Sarvari, Kristina H Haugaa, Otto A Smiseth, Thor Edvardsen, Espen W Remme
BACKGROUND: Preserved left ventricular (LV) ejection fraction (EF) and reduced myocardial strain are reported in patients with hypertrophic cardiomyopathy, ischemic heart disease, diabetes mellitus, and more. OBJECTIVES: The authors performed a combined mathematical and echocardiographic study to understand the inconsistencies between EF and strains. METHODS: An analytical equation showing the relationship between EF and the 4 parameters, global longitudinal strain (GLS), global circumferential strain (GCS), wall thickness, and short-axis diameter, was derived from an elliptical LV model...
August 22, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28817574/diffusion-tensor-imaging-profiles-reveal-specific-neural-tract-distortion-in-normal-pressure-hydrocephalus
#16
Nicole C Keong, Alonso Pena, Stephen J Price, Marek Czosnyka, Zofia Czosnyka, Elise E DeVito, Charlotte R Housden, Barbara J Sahakian, John D Pickard
BACKGROUND: The pathogenesis of normal pressure hydrocephalus (NPH) remains unclear which limits both early diagnosis and prognostication. The responsiveness to intervention of differing, complex and concurrent injury patterns on imaging have not been well-characterized. We used diffusion tensor imaging (DTI) to explore the topography and reversibility of white matter injury in NPH pre- and early after shunting. METHODS: Twenty-five participants (sixteen NPH patients and nine healthy controls) underwent DTI, pre-operatively and at two weeks post-intervention in patients...
2017: PloS One
https://www.readbyqxmd.com/read/28817483/time-course-study-on-left-ventricular-function-in-a-rabbit-model-of-ischemia-reperfusion-injury-with-morphine-preconditioning
#17
Baihua Zhao, Chengxiao Liu, Darong Pu, Shi Zeng, Xi Dai, Minghui Liu
AIMS: The study aimed to analyze the left ventricular longitudinal function in a rabbit model of myocardial ischemia-reperfusion with morphine preconditioning through strain rate imaging and evaluate the effect of morphine preconditioning. METHODS: A myocardial ischemia-reperfusion model was induced by occlusion and recanalization of the coronary artery in forty male New Zealand white rabbits, which were divided into a sham group, morphine group, and vehicle control group...
August 15, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28816526/echocardiographic-assessment-of-right-ventricle-dimensions-and-function-after-exposure-to-extreme-altitude-is-an-expedition-to-8000%C3%A2-m-hazardous-for-right-ventricular-function
#18
Marta Kurdziel, Jarosław Wasilewski, Karolina Gierszewska, Anna Kazik, Gracjan Pytel, Jacek Wacławski, Adam Krajewski, Anna Kurek, Lech Poloński, Mariusz Gąsior
Kurdziel, Marta, Jarosław Wasilewski, Karolina Gierszewska, Anna Kazik, Gracjan Pytel, Jacek Wacławski, Adam Krajewski, Anna Kurek, Lech Poloński, and Mariusz Gąsior. Echocardiographic assessment of right ventricle dimensions and function after exposure to extreme altitude: Is an expedition to 8000 m hazardous for right ventricular function? High Alt Med Biol 00:000-000, 2017.-Although the right ventricle (RV) is under great hypoxic stress at altitude, still little is known what happens to the RV after descent...
August 17, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28816160/the-impact-of-cardiac-radiation-dosimetry-on-survival-after-radiation-therapy-for-non-small-cell-lung-cancer
#19
S Vivekanandan, D B Landau, N Counsell, D R Warren, A Khwanda, S D Rosen, E Parsons, Y Ngai, L Farrelly, L Hughes, M A Hawkins, J D Fenwick
PURPOSE: The heart receives high radiation doses during radiation therapy of advanced-stage lung cancer. We have explored associations between overall survival, cardiac radiation doses, and electrocardiographic (ECG) changes in patients treated in IDEAL-CRT, a trial of isotoxically escalated concurrent chemoradiation delivering tumor doses of 63 to 73 Gy. METHODS AND MATERIALS: Dosimetric and survival data were analyzed for 78 patients. The whole heart, pericardium, AV node, and walls of left and right atria (LA/RA-Wall) and ventricles (LV/RV-Wall) were outlined on radiation therapy planning scans, and differential dose-volume histograms (dDVHs) were calculated...
September 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28815597/cardiac-action-potential-repolarization-re-visited-early-repolarization-shows-all-or-none-behaviour
#20
Beatriz Trenor, Karen Cardona, Javier Saiz, Denis Noble, Wayne Giles
In healthy mammalian hearts the action potential (AP) waveform initiates and modulates each contraction, or heartbeat. As a result, action potential height and duration are key physiological variables. In addition, rate-dependent changes in ventricular action potential duration (APD), and variations in APD at a fixed heart rate, are both reliable biomarkers of electrophysiological stability. Present guidelines for the likelihood that candidate drugs will increase arrhythmias rely on small changes in APD and Q-T intervals as criteria for Safety Pharmacology decisions...
August 17, 2017: Journal of Physiology
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