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https://www.readbyqxmd.com/read/27890738/ventricular-arrhythmias-associated-with-left-ventricular-non-compaction-electrophysiological-characteristics-mapping-and-ablation
#1
Daniele Muser, Jackson J Liang, Walter R T Witschey, Rajeev K Pathak, Simon Castro, Silvia Magnani, Erica S Zado, Fermin C Garcia, Benoit Desjardins, David J Callans, David S Frankel, Francis E Marchlinski, Pasquale Santangeli
BACKGROUND: Left ventricular non-compaction (LVNC) is a primary cardiomyopathy that can present with recurrent ventricular arrhythmias (VAs). Data on the benefit of catheter ablation (CA) of VAs in LVNC are lacking. OBJECTIVES: To describe the electrophysiologic features and outcomes of CA of VAs in LVNC. METHODS: The cohort consisted of 9 patients (age 42±15 years) with diagnosis of LVNC based upon established criteria and VA (VT in 3 and frequent PVCs in 6) despite treatment with a mean of 2±1 antiarrhythmic drugs (AADs)...
November 23, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27888339/nonlinear-variations-of-forest-leaf-area-index-over-china-during-1982-2010-based-on-eemd-method
#2
Yunhe Yin, Danyang Ma, Shaohong Wu, Erfu Dai, Zaichun Zhu, Ranga B Myneni
Variations in leaf area index (LAI) are critical to research on forest ecosystem structure and function, especially carbon and water cycle, and their responses to climate change. Using the ensemble empirical mode decomposition (EEMD) method and global inventory modeling and mapping studies (GIMMS) LAI3g dataset from 1982 to 2010, we analyzed the nonlinear feature and spatial difference of forest LAI variability over China for the past 29 years in this paper. Results indicated that the national-averaged forest LAI was characterized by quasi-3- and quasi-7-year oscillations, which generally exhibited a rising trend with an increasing rate...
November 25, 2016: International Journal of Biometeorology
https://www.readbyqxmd.com/read/27875131/non-invasive-personalisation-of-a-cardiac-electrophysiology-model-from-body-surface-potential-mapping
#3
Sophie Giffard-Roisin, Thomas Jackson, Lauren Fovargue, Jack Lee, Herve Delingette, Reza Razavi, Nicholas Ayache, Maxime Sermesant
Modelling cardiac electrophysiology (EP) can help understand pathologies and predict the response to therapies. Moreover, estimating patient-specific parameters of the EP model is crucial to obtain personalised information. The novelty of this paper is to use non-invasive data (body surface potential mapping, BSPM) in order to personalise the main parameters of a cardiac EP model for predicting different pacing conditions. First, an efficient forward model is proposed, coupling the Mitchell- Schaeffer transmembrane potential model with a current dipole formulation...
November 16, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27871987/body-surface-mapping-using-an-ecg-belt-to-characterize-electrical-heterogeneity-for-different-left-ventricular-pacing-sites-during-cardiac-resynchronization-relationship-with-acute-hemodynamic-improvement
#4
W Ben Johnson, Pierce J Vatterott, Michael A Peterson, Suveer Bagwe, R Dent Underwood, Alan J Bank, Ryan M Gage, Brian Ramza, Blair W Foreman, Vincent Splett, Tarek Haddad, Jeffrey M Gillberg, Subham Ghosh
BACKGROUND: Electrical heterogeneity (EH) during cardiac resynchronization therapy (CRT) may vary with different left ventricular (LV) pacing sites. OBJECTIVE: The study aims to evaluate the relationship between such changes and acute hemodynamic response (AHR). METHODS: Two EH metrics, standard deviation of activation times (SDAT) and mean left thorax activation time (LTAT), were computed from isochronal maps based on 53-electrode body-surface mapping (BSM) during baseline AAI pacing and biventricular pacing (BiVp) from different pacing sites in coronary veins in 40 CRT-indicated patients...
November 18, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27870114/the-molecular-genetics-of-autosomal-recessive-nonsyndromic-intellectual-disability-a-mutational-continuum-and-future-recommendations
#5
REVIEW
Muzammil Ahmad Khan, Saadullah Khan, Christian Windpassinger, Muhammad Badar, Zafar Nawaz, Ramzi M Mohammad
Intellectual disability (ID) is a clinical manifestation of the central nervous system without any major dysmorphologies of the brain. Biologically it affects learning capabilities, memory, and cognitive functioning. The basic defining features of ID are characterized by IQ<70, age of onset before 18 years, and impairment of at least two of the adaptive skills. Clinically it is classified in a syndromic (with additional abnormalities) and a nonsyndromic form (with only cognitive impairment). The study of nonsyndromic intellectual disability (NSID) can best explain the pathophysiology of cognition, intelligence and memory...
November 2016: Annals of Human Genetics
https://www.readbyqxmd.com/read/27867072/changes-in-electrical-dyssynchrony-by-body-surface-mapping-predict-left-ventricular-remodeling-in-cardiac-resynchronization-therapy-patients
#6
Ryan M Gage, Antonia E Curtin, Kevin V Burns, Subham Ghosh, Jeffrey M Gillberg, Alan J Bank
BACKGROUND: Electrical activation is important in CRT response. Standard ECG analysis may not accurately reflect the heterogeneity of electrical activation. OBJECTIVE: We compared changes in LV size and function following CRT to native electrical dyssynchrony and its change during pacing. METHODS: Body-surface isochronal maps utilizing 53 anterior and posterior electrodes, and 12-lead ECGs, were acquired following CRT in 66 consecutive patients...
November 17, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27826248/slow-conduction-in-the-border-zones-of-patchy-fibrosis-stabilizes-the-drivers-for-atrial-fibrillation-insights-from-multi-scale-human-atrial-modeling
#7
Ross Morgan, Michael A Colman, Henry Chubb, Gunnar Seemann, Oleg V Aslanidi
Introduction: The genesis of atrial fibrillation (AF) and success of AF ablation therapy have been strongly linked with atrial fibrosis. Increasing evidence suggests that patient-specific distributions of fibrosis may determine the locations of electrical drivers (rotors) sustaining AF, but the underlying mechanisms are incompletely understood. This study aims to elucidate a missing mechanistic link between patient-specific fibrosis distributions and AF drivers. Methods: 3D atrial models integrated human atrial geometry, rule-based fiber orientation, region-specific electrophysiology, and AF-induced ionic remodeling...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27800606/promoting-cancer-control-in-africa-with-ubuntu-a-report-of-the-african-organization-for-research-and-training-in-africa-aortic-10-th-conference-2015-in-marrakech-morocco
#8
Kenneth O Simbiri, Christopher K Williams, Marcella Macaluso, Antonio Giordano
The objectives of the African Organization for Research and Training in Cancer (AORTIC), includes bringing products of decades of advances in cancer research to African populations through local and international collaboration. The consistent and huge growth in participation in the conferences and the diversity of the nations is a witness to the success of the organization thus far. The theme for the Tenth AORTIC International Conference on Cancer in Africa in Morocco in 2015 was "Road map to Cancer Control in Africa" and topics of discussion of paramount importance for low- and middle-income African countries included childhood cancers such as BL, cancers of the cervix, breast, and prostate; cancers associated with HIV-infection such as cervical, vulvar, and anal; as well as cancer care challenges associated with palliative care...
November 1, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27799910/an-activation-likelihood-estimation-meta-analysis-study-of-simple-motor-movements-in-older-and-young-adults
#9
Ted K Turesky, Peter E Turkeltaub, Guinevere F Eden
The functional neuroanatomy of finger movements has been characterized with neuroimaging in young adults. However, less is known about the aging motor system. Several studies have contrasted movement-related activity in older versus young adults, but there is inconsistency among their findings. To address this, we conducted an activation likelihood estimation (ALE) meta-analysis on within-group data from older adults and young adults performing regularly paced right-hand finger movement tasks in response to external stimuli...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27790723/imaging-the-propagation-of-the-electromechanical-wave-in-heart-failure-patients-with-cardiac-resynchronization-therapy
#10
Ethan Bunting, Litsa Lambrakos, Paul Kemper, William Whang, Hasan Garan, Elisa Konofagou
BACKGROUND: Current electrocardiographic and echocardiographic measurements in heart failure (HF) do not take into account the complex interplay between electrical activation and local wall motion. The utilization of novel technologies to better characterize cardiac electromechanical behavior may lead to improved response rates with cardiac resynchronization therapy (CRT). Electromechanical Wave Imaging (EWI) is a non-invasive ultrasound-based technique that uses the transient deformations of the myocardium to track the intrinsic electromechanical wave that precedes myocardial contraction...
October 27, 2016: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/27788744/-clinical-analysis-of-19-cases-of-pregnant-women-with-rapid-arrhythmia-in-the-treatment-of-radiofrequency-catheter-ablation
#11
L Chu, J Zhang, Y N Li, D Y Long
: Objective: To investigate the risk of radiofrequency catheter ablation and maternal and infant in pregnant women with rapid arrhythmia during pregnancy. Methods: The clinical data of the 19 cases of pregnancy complicated with rapid arrhythmia were retrospectively analyzed and followed up, including the gestational week, the type of arrhythmia, the treatment, and the outcome of the mother and child in Beijing Anzhen Hospital of Capital Medical University from January 2002 to March 2016...
October 25, 2016: Zhonghua Fu Chan Ke za Zhi
https://www.readbyqxmd.com/read/27782003/electromechanical-wave-imaging-ewi-validation-in-all-four-cardiac-chambers-with-3d-electroanatomic-mapping-in-canines-in-vivo
#12
Alexandre Costet, Elaine Wan, Ethan Bunting, Julien Grondin, Hasan Garan, Elisa Konofagou
Characterization and mapping of arrhythmias is currently performed through invasive insertion and manipulation of cardiac catheters. Electromechanical wave imaging (EWI) is a non-invasive ultrasound-based imaging technique, which tracks the electromechanical activation that immediately follows electrical activation. Electrical and electromechanical activations were previously found to be linearly correlated in the left ventricle, but the relationship has not yet been investigated in the three other chambers of the heart...
November 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27781328/preferential-conduction-during-posterior-papillary-muscle-origin-premature-ventricular-contractions-demonstrated-by-pace-mapping
#13
Taihei Itoh, Takumi Yamada
No abstract text is available yet for this article.
October 25, 2016: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/27762397/a-unified-theory-of-calcium-alternans-in-ventricular-myocytes
#14
Zhilin Qu, Michael B Liu, Michael Nivala
Intracellular calcium (Ca(2+)) alternans is a dynamical phenomenon in ventricular myocytes, which is linked to the genesis of lethal arrhythmias. Iterated map models of intracellular Ca(2+) cycling dynamics in ventricular myocytes under periodic pacing have been developed to study the mechanisms of Ca(2+) alternans. Two mechanisms of Ca(2+) alternans have been demonstrated in these models: one relies mainly on fractional sarcoplasmic reticulum Ca(2+) release and uptake, and the other on refractoriness and other properties of Ca(2+) sparks...
October 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27739159/will-phenotypic-plasticity-affecting-flowering-phenology-keep-pace-with-climate-change
#15
Bryce A Richardson, Lindsay Chaney, Nancy L Shaw, Shannon M Still
Rising temperatures have begun to shift flowering time, but it is unclear whether phenotypic plasticity can accommodate projected temperature change for this century. Evaluating clines in phenological traits and the extent and variation in plasticity can provide key information on assessing risk of maladaptation and developing strategies to mitigate climate change. In this study, flower phenology was examined in 52 populations of big sagebrush (Artemisia tridentata) growing in three common gardens. Flowering date (anthesis) varied 91 days from late July to late November among gardens...
October 14, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27737802/cardiac-activation-repolarization-patterns-and-ion-channel-expression-mapping-in-intact-isolated-normal-human-hearts
#16
Tobias Opthof, Carol Ann Remme, Esther Jorge, Francisco Noriega, Rob F Wiegerinck, Arlin Tasiam, Leander Beekman, Jesus Alvarez-Garcia, Cristian Munoz-Guijosa, Ruben Coronel, Juan Cinca
BACKGROUND: The repolarization pattern of the human heart is unknown. OBJECTIVE: The purpose of this study was to perform a multisite analysis of the activation-repolarization patterns and mRNA expression patterns of ion channel subunits in isolated human hearts. METHODS: Hearts from 3 donors without reported cardiac disease were Langendorff perfused with the patient's own blood. A standard ECG was obtained before explantation. Up to 92 unipolar electrograms from 24 transmural needles were obtained during right atrial pacing...
October 11, 2016: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/27733459/catheter-ablation-for-ventricular-tachycardia-following-surgical-treatment-of-pulmonary-stenosis-with-intact-ventricular-septum
#17
Bingbo Hou, Lihui Zheng, Guodong Niu, Lingmin Wu, Yu Qiao, Wei Sun, Ligang Ding, Gang Chen, Shu Zhang, Reginald Liew, Yan Yao
AIMS: This study was aimed to report the characteristics and treatment of ventricular tachycardia (VT) following surgical treatment of pulmonary stenosis with intact ventricular septum. METHODS AND RESULTS: Five patients underwent radiofrequency catheter ablation for sustained monomorphic left bundle branch block (LBBB) type VT who previously underwent surgical treatment of pulmonary stenosis. Except stimulation, voltage and activation mapping was performed using three-dimensional (3D) electro-anatomic mapping and ablation was applied accordingly...
October 12, 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/27659539/a-virtual-water-maze-revisited-two-year-changes-in-navigation-performance-and-their-neural-correlates-in-healthy-adults
#18
Ana M Daugherty, Naftali Raz
Age-related declines in spatial navigation are associated with deficits in procedural and episodic memory and deterioration of their neural substrates. For the lack of longitudinal evidence, the pace and magnitude of these declines and their neural mediators remain unclear. Here we examined virtual navigation in healthy adults (N=213, age 18-77 years) tested twice, two years apart, with complementary indices of navigation performance (path length and complexity) measured over six learning trials at each occasion...
September 19, 2016: NeuroImage
https://www.readbyqxmd.com/read/27618267/catastrophic-declines-in-wilderness-areas-undermine-global-environment-targets
#19
James E M Watson, Danielle F Shanahan, Moreno Di Marco, James Allan, William F Laurance, Eric W Sanderson, Brendan Mackey, Oscar Venter
Humans have altered terrestrial ecosystems for millennia [1], yet wilderness areas still remain as vital refugia where natural ecological and evolutionary processes operate with minimal human disturbance [2-4], underpinning key regional- and planetary-scale functions [5, 6]. Despite the myriad values of wilderness areas-as critical strongholds for endangered biodiversity [7], for carbon storage and sequestration [8], for buffering and regulating local climates [9], and for supporting many of the world's most politically and economically marginalized communities [10]-they are almost entirely ignored in multilateral environmental agreements...
November 7, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27590870/profiling-stem-cell-states-in-three-dimensional-biomaterial-niches-using-high-content-image-informatics
#20
Anandika Dhaliwal, Matthew Brenner, Paul Wolujewicz, Zheng Zhang, Yong Mao, Mona Batish, Joachim Kohn, Prabhas V Moghe
: A predictive framework for the evolution of stem cell biology in 3-D is currently lacking. In this study we propose deep image informatics of the nuclear biology of stem cells to elucidate how 3-D biomaterials steer stem cell lineage phenotypes. The approach is based on high content imaging informatics to capture minute variations in the 3-D spatial organization of splicing factor SC-35 in the nucleoplasm as a marker to classify emergent cell phenotypes of human mesenchymal stem cells (hMSCs)...
November 2016: Acta Biomaterialia
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