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Cardiac electrical and mechanical synchrony of super-responders to cardiac resynchronization therapy

Chinese Medical Journal 2020年第2期133卷 141-147页

作者： Ke-Bei Li Zhi-Yong Qian Xue-Song Qian Yong Zhou Di-Di Zhu Yuan-Hao Qiu Yao Wang Xiao-Feng Hou Jian-Gang Zou Yu-Feng Sheng Department of Cardiology The Affiliated Zhangjiagang Hospital of Soochow UniversityZhangjiagangJiangsu 215600China Department of Cardiology First Affiliated HospitalNanjing Medical UniversityNanjingJiangsu 210029China Department of Cardiology Zhongda Hospital Southeast UniversityNanjingJiangsu 210029China

Background:Super-responders(SRs)to cardiac resynchronization therapy(CRT)regain near-normal or normal cardiac function.The extent of cardiac synchrony of SRs and whether continuous biventricular(BIV)pacing is needed remain unknown.The aim of this study was to evaluate the cardiac electrical and mechanical synchrony of SRs.Methods:We retrospectively analyzed CRT recipients between 2008 and 2016 in 2 centers to identify SRs,whose left ventricular(LV)ejection fraction was increased to≥50%at follow-up.Cardiac synchrony was evaluated in intrinsic and BIV-paced rhythms.Electrical synchrony was estimated by QRS duration and LV mechanical synchrony by single-photon emission computed tomography myocardial perfusion imaging.Results:Seventeen SRs were included with LV ejection fraction increased from 33.0±4.6%to 59.3±6.3%.The intrinsic QRS duration after super-response was 148.8±30.0 ms,significantly shorter than baseline(174.8±11.9 ms,P=0.004,t=3.379)but longer than BIV-paced level(135.5±16.7 ms,P=0.042,t=2.211).Intrinsic LV mechanical synchrony significantly improved after super-response(phase standard deviation[PSD],51.1±16.5°vs.19.8±8.1°,Psynchrony(PSD,19.8±8.1°vs.15.2±6.4°,P=0.005,t=3.414;PHB,60.5±22.9°vs.46.0±16.3°,P=0.009,t=3.136).Conclusions:SRs had significant improvements in cardiac electrical and LV mechanical synchrony.Since intrinsic synchrony of SRs was still inferior to BIV-paced rhythm,continued BIV pacing is needed to maintain longstanding and synchronized contraction.

关键词： Cardiac resynchronization Super-responders Electrical synchrony Mechanical synchrony

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Two sides of a coin： host-plant synchrony fitness trade-offs in the population dynamics of the western spruce budworm

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Insect Science 2018年第1期25卷 117-126页

作者： Jacques Regniere Vincent G. Nealis Natural Resources Canada Canadian Forest Service Laurentian Forestry Centre Quebec Canada Natural Resources Canada Canadian Forest Service Pacific Forestry Centre Victoria British Columbia Canada

Conifer-feeding budworms emerge from overwintering sites as small larvae in early spring, several days before budburst, and mine old needles. These early-emerging larvae suffer considerable mortality during this foraging period as they disperse in search of available, current-year buds. Once buds flush, surviving budworms construct feeding shelters and must complete maturation before fresh host foliage senesces and lignifies later in the summer. Late-developing larvae suffer greater mortality and survivors have lower fecundity when feeding on older foliage. Thus, there is a seasonal trade-off in fitness associated with host synchrony： early-emerging budworms have a greater risk of mortality during spring dispersal but gain better access to the most nutritious foliage, while, on the other hand, late-emerging larvae incur a lower risk during the initial foraging period but must contend with rapidly diminishing resource quality at the end of the feeding period. We investigate the balance that results from these early-season and late-season synchrony fitness trade-offs using the concept of the phenological window. Parameters associated with the variation in the phenological window are used to estimate generational fitness as a function of host-plant synchrony. Because defoliation modifies these relationships, it is also included in the analysis. We show that fitness trade-offs characterizing the phenological window result in a robust synchrony relationship between budworm and host plant over a wide geographic range in southern British Columbia, Canada.

关键词： budburst budworm feeding fitness synchrony

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Associative fear learning-induced changes in the synchrony of activity between hippocampal CA1 pyramidal cells

Associative fear learning-induced changes in the synchrony o...

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中国神经科学学会第十届全国学术会议

作者： Yao WANG Wei-Da SHEN Chao DING Zhiru WANG Plasticity of Neural Circuit Lab Key Laboratory of Brain Functional GenomicsMinistry of EducationEast China Normal University

Objective The hippocampus implements its function of initial memory consolidation with the dependence of spontaneous oscillations.This raises a possibility that spontaneous oscillations in the hippocampus may undergo some learning-associated changes with the requirement for memory consolidation,an issue that has been addressed.Methods Using simultaneous whole-cell recordings in anaesthetized rats,we measured the synchrony between spontaneous oscillations of CA1 pyramidal cells in vivo.Results We found that,in rats recently（on day 1） receiving an associative learning paradigm of trace fear conditioning,the extent of correlations between the spontaneous oscillations measured simultaneously from CA1 pyramidal cells were increased significantly to a higher level,as compared with that observed in unlearned（naive） rats.This increase disappeared on day 5 after the learning,indicating a transient increase in the synchrony of CA1 activity accompanying imtial memory storage and consolidation in the hippocampus.Conclusion Our data suggest that a transient increase in the synchrony of membrane-potential oscillations between CA1 pyramidal cells may be used by the hippocampus for initial memory consolidation,with the effect contributing to activity-dependent neuronal plasticity for permanent memory storage in other brain regions.

关键词： oscillation synchrony hippocampus associative learning memory consolidation

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Ultrasound evaluation of left ventricular remodeling and systolic synchrony in patients with primary hypertension and the correlation with serum cytokines and MMPs

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Journal of Hainan Medical University 2017年第1期23卷 24-27页

作者： Hai-Yan Kou Li Liang Jin-Hua Su Department of Ultrasonography General Hospital of Chinese People’s Armed Police ForcesBeijing100039China

Objective:To study the correlation of the ultrasound parameters of left ventricular remodeling and systolic synchrony in patients with primary hypertension with serum cytokines and matrix metalloproteinases (MMPs).Methods:134 patients with primary hypertension receiving three-dimensional echocardiography examination in our hospital between May 2013 and March 2016 were selected and divided into the group A with normal pattern (n=71), group B with concentric hypertrophy (n=39) and group C with eccentric hypertrophy (n=24) according to the left ventricular internal diameter at end-diastole (LVIDd) and left ventricular mass index (LVMI), and the ultrasound parameters of left ventricular remodeling and systolic synchrony as well as serum content of cytokines and MMPs were determined.Results: The time to minimal systolic volume of 16-segmental standard deviation (SDI), maximum time difference (DIF), Tpe, Tpe interphase and its correction (Tpec), LVIDd, LVMI and left ventricular remodeling index (LVRI) of group B and group C were significantly higher than those of group A (Psynchrony significantly change in

关键词： Primary hypertension Left ventricular remodeling Systolic synchrony cytokine Matrix metalloproteinase

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Triadic synchrony: Application of Multiple Wavelet Coherence to a Small Group Conversation

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Applied Mathematics 2016年第14期7卷 1477-1483页

作者： Ken Fujiwara Faculty of Human Sciences Osaka University of Economics Osaka Japan

By applying multiple wavelet coherence (MWC) to data from human body movements in triadic interaction, this study quantified triadic synchrony, rhythmic similarity among three interactants. Thirty-nine Japanese undergraduates were randomly assigned in a triad, and engaged in a brain-storming task. Triadic synchrony was quantified by calculating MWC to the time-series movement data collected by Kinect v2 sensor. The existence of synchrony was statistically tested by using a pseudo-synchrony paradigm. Results showed that the averaged value of MWC was higher in the experimental participant trio than in those of the pseudo trio in the frequency band of 0.5 - 1 Hz. The result supports the possible utility of applying multiple wavelet coherence to evaluate triadic synchrony in a small group interaction.

关键词： Multiple Wavelet Coherence Nonverbal Behavior synchrony Small Group Automated Method

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Female indris determine the rhythmic structure of the song and sustain a higher cost when the chorus size increases

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Current Zoology 2019年第1期65卷 89-97页

作者： Chiara De Gregorio Anna Zanoli Daria Valente Valeria Torti Giovanna Bonadonna Rose Marie Randrianarison Cristina Giacoma Marco Gamba Dipartimento di Scienze della Vita e Biologia dei Sistemi Universita di Torino via Accademia Albertina Torino Italia Dipartimento di Scienze Chimiche della Vita e della Sostenibilita Ambientale Universita di Parma Parma Italia Group d'Ttude et de Recherche sur les Primates de Madagascar (GERP) Antananarivo Madagascar Departement de Anthropobiologie et Developpement Durable Universite d'Antananarivo Faculte des Sciences Antananarivo Madagascar

Among the behavioral traits shared by some nonhuman primate species and humans there is singing. Unfortunately, our understanding of animals' rhythmic abilities is still in its infancy. Indris are the only lemurs who sing and live in monogamous pairs, usually forming a group with their offspri ng. All adult members of a group usually participate in choruses that are emitted regularly and play a role in advertising territorial occupa ncy and in tergroup spaci ng. Males and females emit phrases that have similar frequency ranges but may differ in their temporal structure. We examined whether the individuals' contribution to the song may change according to chorus size, the total duration of the song or the duration of the individual con tribution using the in ter-on set intervals within a phrase and between phrases. We found that the rhythmic structure of indri's songs depends on factors that are different for males and females. We showed that females have sigrdficantly higher variation in the rhythm of their contribution to the song and that, changes according to chorus size. Our findings indicate that female indris sustain a higher cost of singing than males whe n the nu mber of singers in creases. These results suggest that cross-species investigatio ns will be crucial to un derstanding the evoluti on ary frame in which such sexually dimorphic traits occurred.

关键词： chorus coordination duets lemurs singing synchrony

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Synchronous waving in fiddler crabs: a review

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Current Zoology 2019年第1期65卷 83-88页

作者： Patricia Ruth Yvonne Backwell Research School of Biology The Australian National University Canberra ACT 2601 Australia

Many animals that use acoustic communication synchronize their mate attract!on signals: individuals precisely time their calls to overlap those of their neighbors. In contrast, synchrony in the mate attraction displays of species with visual/motion-based signals is rare. It has only been documented in five species of fiddler crabs. In all of them, small groups of males wave their single large claw in close synchrony. Here, I review what we know about synchrony in fiddler crabs, comparing the five species with each other to determine whether similar mechanisms and functions are comm on to all. I also propose future research questions that, if answered, would shed light on synchronous behavior in both visual and acoustic signallers.

关键词： fiddler crab synchrony waving mate choice wave timing visual signal

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Mechanism for propagation of rate signals through a 10-layer feedforward neuronal network

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Chinese Physics B 2009年第12期18卷 5560-5565页

作者：李捷于婉卿徐定刘锋王炜 National Laboratory of Solid State Microstructure and Department of Physics Nanjing University State Key Laboratory of Pharmaceutical Biotechnology and School of Life Nanjing University

Using numerical simulations, we explore the mechanism for propagation of rate signals through a 10-layer feed-forward network composed of Hodgkin-Huxley （HH） neurons with sparse connectivity. When white noise is afferent to the input layer, neuronal firing becomes progressively more synchronous in successive layers and synchrony is well developed in deeper layers owing to the feedforward connections between neighboring layers. The synchrony ensures the successful propagation of rate signals through the network when the synaptic conductance is weak. As the synaptic time constant Tsyn varies, coherence resonance is observed in the network activity due to the intrinsic property of HH neurons. This makes the output firing rate single-peaked as a function of Tsyn, suggesting that the signal propagation can be modulated by the synaptic time constant. These results are consistent with experimental results and advance our understanding of how information is processed in feedforward networks.

关键词： feedforward network synchrony rate coding Hodgkin-Huxley model

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The relationship between LFP and spike during the period of IEDs in penicillin epilepsy model

The relationship between LFP and spike during the period of ...

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中国神经科学学会第十二届全国学术会议

作者： Xiao-Tian WANG Yi-Le JIN Chao-Nan Yu Shao-Min ZHANG Qiushi Academy for Advanced Studies Zhejiang University Department of Biomedical Engineering Key Laboratory of Biomedical Engineering of Education Ministry Zhejiang University Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal

Between seizures, there are synchronous paroxysmal electrical activities on electroencephalogram, termed as interictal epileptiform discharges（IEDs）. Interest in the neurophysiological mechanisms underlying IEDs has increased during the last decade. We used the rat model to mimic the acute seizures by application of penicillin. We simultaneously recorded local field potentials（LFPs） and single-unit action potentials during IEDs. We found that a phase-lock relationship between the LFPs and single neuron, all neurons fired near or during the peak of IEDs. These neurons showed a great synchrony during the IEDs, supporting the previous studies in animal models that IEDs reflect synchronous and excessive discharges from a large population of neurons.

关键词： epilepsy penicillin IEDs Local Field Potential spike phase-lock synchrony

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Effects of temperature on flowering phenological traits of Populus euphratica Oliv. and Populus pruinosa Schrenk populations, Xinjiang, China

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Journal of Arid Land 2019年第5期11卷 754-763页

作者： LI Zhijun ZHANG Xiao ZHENG Yaqiong QIU Aijun ZHANG Ling College of Life Sciences Tarim UniversityAral 843300China Key Laboratory of Protection and Utilization of Biological Resource in Tarim Basin Xinjiang Production&Construction GroupsAral 843300China

The aims of this study were to explore the interspecific differences of Populus euphratica Oliv.and Populus pruinosa Schrenk populations and the intraspecific differences of males and females within the same species in flowering phenological traits,and the effects of temperatures on flowering phenological traits in different growth years(2001–2003 and 2013–2015).The results showed that P.euphratica population flowered earlier than P.pruinosa population.Moreover,flowering phenological period of population,number of days of flowering phenological period per population,number of days of flowering phenological period per plant and average number of days of flowering period per plant of P.euphratica population were less than those of P.pruinosa population.The differences between male and female within the same species indicated that the flowering periods of males P.euphratica and P.pruinosa populations were earlier than those of female plants.For both species,flowering phenological traits were significantly and negatively correlated with the average temperatures in previous ten days,previous one month and previous three months of flowering.Both species are sensitive to temperature changes and adjust to the changes by advancing the start of flowering and prolonging the duration of flowering.

关键词： Populus euphratica Oliv. Populus pruinosa Schrenk flowering phenology temperature flowering synchrony

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