类型: 斑马鱼研究设备
名称: 斑马鱼心电(ECG)测量系统
CardioFish heart electrophysiological measurement system
型号:ZFS-01
CARDIOFISH系统是一款最新开发的检测成年斑马鱼心脏功能的产品,该系统可以有效地用于测试药理学、安全药理学(safety pharmacology)和毒理学 (toxicology)等药物分子的效果和副作用, 它也是很适合心律失常(arrhythmias )和regener-ation心脏肌肉能力的基础研究。
CardioFish系统主要用于斑马鱼心率监测,系统包括三个单元:
1. 机械装置
2. 低噪音宽频模拟放大器
3. 数据可视化 (visualization),存档(archiving)和-评测(evaluation)硬件/软件
特殊的法拉第笼(The Faraday cage)无振动物体箱固定有系统两个主要部件(显微操作仪和宽频放大器),它确保完全屏蔽电气和磁场的干扰,还附带有一个小鱼缸和两个显微操作仪,显微操作仪可以很容易地水平调整和移动电极固定器,电极固定器可安装我们的不锈钢电极或标准的玻璃电极。
测量数据(MEASURING DATABASE)
采集和分析框架是源自经典的并已验证的记录和分析系统(Cardiosys),该系统已用于心脏 (cardiac R&D)研发15年。软件记录数据和处理是通过其中的Cardiofish Z-01软件来管理的,它有一个内置的数据库架构,所有测量结果自动存储,数据库可以通过快捷按钮打开。
斑马鱼心电记录(ECG RECORDING)
1. 斑马鱼心电记录(ECG recordings)可通过监视画面上的快捷按钮和滚动菜单进行查看,心电曲线(ECG curve)可应用可视化滤波器或出现的视觉参数加以改变(如:amplifica-tion、速度), 测量值注释可以被记录,各个数据记录处理可以单独的被启动或停止。
2. 采样频率可以在0.5和5 kHz之间调整,同时提供了一个合适的低通转角频率设置(Nyqvist频率),可以确保快速的详细特征信号(QRS)保存。
3. 斑马鱼心电(ECG)信号显示可通过设置时间窗口宽度和放大显示进行调整,最优化的过滤效果(50或60Hz陷波滤波器,高通基线过滤器(删除breath-related基线振荡)和低通高频带阻滤波器)是由可视化叠加和过滤信号辅助的,用户可以循着记录点进行时间分类标注,很容易的截取感兴趣的部分进行脱机制作分析。
离线分析(OFFLINE ANALYZATIONS )
记录的ECG心电图信号可以在测量后进行正确评估或以后任何时候都可以评估,软件提供了五种不同的可能性,最典型的(ECG)心电图参数可以快速计算,以及更复杂的功能,以及更广泛的选择:
1. 单光标分析(One cursor analysis): 一个应用于收集振幅,在用户心电图(ECG)信号上定义光标位置和HR值被收集到一个带统计功能的图表里。
2. 经典ECG分析(Classical ECG analysis): 评价心电图(ECG)的自动参数测量,用户可从任何一个可选周期选择。
3. ECG平均分析(ECG averaged analysis): 用户定义的持续心电周期( ECG cycles)数可以被同步化和平均化,allow-ing extraction of low amplitude features. 自动参数测量可以做到任何用户定义平均信号的的时间范围。
4. 心电图QT分析(ECG QT analysis): calculating an eligible QT or QTc value, as well as QT variability (QTv) as a function of RR or HR, in case of at least 32 chosen cycles. Criteria of reliability of the measurements are also evaluated.
5. 心脏频率变化(HRV)分析(Heart frequency variation (HRV) analysis): 心脏频率的变化是随时间和频率分析而变化的, 也提供有正常化得RR。
CARDIOFISH系统是一款最新开发的检测成年斑马鱼心脏功能的产品,该系统可以有效地用于测试药理学、安全药理学(safety pharmacology)和毒理学 (toxicology)等药物分子的效果和副作用, 它也是很适合心律失常(arrhythmias )和regener-ation心脏肌肉能力的基础研究。
1) 程序基于64位操作系统;
2) 单通道记录;
3) 实时观察和记录ECG曲线;
4) 屏幕运行时间:5、10、25或50毫米/秒 ;
5) 持续的心电(ECG)监护心脏频率显示 ;
6) 网络噪音滤波(noise-filtering)算法(50/60Hz陷波滤波器);
7) 肌肉运动(振动、颤动)滤波算法;
8) 采样频率:1000采样/秒/通道 ;
9) 放大数: 10000x ;
10) 输入阻抗: 10 MΩ symmetric ;
11) 输入电阻: 50 Ω;
12) 总尺寸:400x300x350 mm;
13) 操纵器 0,05 mm /revolution/25 mm course;
14) 鱼缸体积:20 ml ;
15) 鱼缸尺寸大小: 90x40x20 mm ;
16) 鱼缸材料:阳极氧化铝;
该斑马鱼测试系统主要用以建立一个高通量的能够快速和经济有效的在很短的时间内研究大量分子心脏影响方面的系统。STUDYING THE EFFECTS OF FLUORIDE EXPOSURE ON CARDIAC FUNCTION IN ZEBRAFISH (DANIO RERIO)
RKov*, GyGazsi, DBencsik, Katalin Bakos, Ferenc Baska, GyGrosz, TamGrosz, BUrbZsolt Csenki
Department of Aquaculture, Institute of Environmental and Landscape Management, Faculty of Agricultural and Environmental Sciences, Szent Istv University Pater K. Street 1 H-2100 G (Hungary)
In the last few decades the effects of fluoride have been well-studied in many organisms. In mammalian models it was found that long-term fluoride exposure changes the ECG profile, prolongation of the P-Q and Q-T intervals were detected. Our aim was to study the effects of chronic fluoride exposure on adult zebrafish and to find out if these effects are similar to those found in mammals.
Fish were treated with 50 ppm, 100 ppm and 200 ppm NaF prior to the ECG measurement. Solutions were changed twice a week during the 3 months study. ECG was measured monthly, for data acquisition and analysis the newly developed zebrafish ECG measurement system (EXPERIMETRIA Ltd.) and the ADVANCE HAEMOSYS haemodynamic software were used. To complete our results, short- term effects of fluoride to heart rate were studied on zebrafish embryos. Embryos were treated with 500 ppm, 400 ppm, 200 ppm, 100 ppm, 50 ppm NaF solutions for 3 days. Embryonic heart rate (HR) was analysed on the basis of 30 second video records.
Results correlated well with the mammalian models. In the third month, significant Q-T prolongation (p<0,05) was found in the 100 ppm (414,83ms) group. The Q-T interval increased in the 3rd month 200 ppm (473,06group too, but it wasnt significant. We also found significant (p<0,05) HR decrease in the 3rd month 200 ppm (101,041/min) group. Embryonic HR increased significantly (p<0,01) on second and third days in the 500 ppm groups.
This work was supported by GOP-1.1.1.-07/1-2008-0009 and Tprojects.