CARDIOFISH系統(tǒng)是一款最新開(kāi)發(fā)的檢測(cè)成年斑馬魚(yú)心臟功能的產(chǎn)品,該系統(tǒng)可以有效地用于測(cè)試藥理學(xué)、安全藥理學(xué)(safety pharmacology)和毒理學(xué) (toxicology)等藥物分子的效果和副作用, 它也是很適合心律失常(arrhythmias )和regener-ation心臟肌肉能力的基礎(chǔ)研究。
CardioFish系統(tǒng)主要用于斑馬魚(yú)心率監(jiān)測(cè),系統(tǒng)包括三個(gè)單元:
1. 機(jī)械裝置
2. 低噪音寬頻模擬放大器
3. 數(shù)據(jù)可視化 (visualization),存檔(archiving)和-評(píng)測(cè)(evaluation)硬件/軟件
特殊的法拉第籠(The Faraday cage)無(wú)振動(dòng)物體箱固定有系統(tǒng)兩個(gè)主要部件(顯微操作儀和寬頻放大器),它確保完全屏蔽電氣和磁場(chǎng)的干擾,還附帶有一個(gè)小魚(yú)缸和兩個(gè)顯微操作儀,顯微操作儀可以很容易地水平調(diào)整和移動(dòng)電極固定器,電極固定器可安裝我們的不銹鋼電極或標(biāo)準(zhǔn)的玻璃電極。
測(cè)量數(shù)據(jù)(MEASURING DATABASE)
采集和分析框架是源自經(jīng)典的并已驗(yàn)證的記錄和分析系統(tǒng)(Cardiosys),該系統(tǒng)已用于心臟 (cardiac R&D)研發(fā)15年。軟件記錄數(shù)據(jù)和處理是通過(guò)其中的Cardiofish Z-01軟件來(lái)管理的,它有一個(gè)內(nèi)置的數(shù)據(jù)庫(kù)架構(gòu),所有測(cè)量結(jié)果自動(dòng)存儲(chǔ),數(shù)據(jù)庫(kù)可以通過(guò)快捷按鈕打開(kāi)。
斑馬魚(yú)心電記錄(ECG RECORDING)
1. 斑馬魚(yú)心電記錄(ECG recordings)可通過(guò)監(jiān)視畫(huà)面上的快捷按鈕和滾動(dòng)菜單進(jìn)行查看,心電曲線(ECG curve)可應(yīng)用可視化濾波器或出現(xiàn)的視覺(jué)參數(shù)加以改變(如:amplifica-tion、速度), 測(cè)量值注釋可以被記錄,各個(gè)數(shù)據(jù)記錄處理可以單獨(dú)的被啟動(dòng)或停止。
2. 采樣頻率可以在0.5和5 kHz之間調(diào)整,同時(shí)提供了一個(gè)合適的低通轉(zhuǎn)角頻率設(shè)置(Nyqvist頻率),可以確??焖俚脑敿?xì)特征信號(hào)(QRS)保存。
3. 斑馬魚(yú)心電(ECG)信號(hào)顯示可通過(guò)設(shè)置時(shí)間窗口寬度和放大顯示進(jìn)行調(diào)整,最優(yōu)化的過(guò)濾效果(50或60Hz陷波濾波器,高通基線過(guò)濾器(刪除breath-related基線振蕩)和低通高頻帶阻濾波器)是由可視化疊加和過(guò)濾信號(hào)輔助的,用戶可以循著記錄點(diǎn)進(jìn)行時(shí)間分類標(biāo)注,很容易的截取感興趣的部分進(jìn)行脫機(jī)制作分析。
離線分析(OFFLINE ANALYZATIONS )
記錄的ECG心電圖信號(hào)可以在測(cè)量后進(jìn)行正確評(píng)估或以后任何時(shí)候都可以評(píng)估,軟件提供了五種不同的可能性,最典型的(ECG)心電圖參數(shù)可以快速計(jì)算,以及更復(fù)雜的功能,以及更廣泛的選擇:
1. 單光標(biāo)分析(One cursor analysis): 一個(gè)應(yīng)用于收集振幅,在用戶心電圖(ECG)信號(hào)上定義光標(biāo)位置和HR值被收集到一個(gè)帶統(tǒng)計(jì)功能的圖表里。
2. 經(jīng)典ECG分析(Classical ECG analysis): 評(píng)價(jià)心電圖(ECG)的自動(dòng)參數(shù)測(cè)量,用戶可從任何一個(gè)可選周期選擇。
3. ECG平均分析(ECG averaged analysis): 用戶定義的持續(xù)心電周期( ECG cycles)數(shù)可以被同步化和平均化,allow-ing extraction of low amplitude features. 自動(dòng)參數(shù)測(cè)量可以做到任何用戶定義平均信號(hào)的的時(shí)間范圍。
4. 心電圖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. 心臟頻率變化(HRV)分析(Heart frequency variation (HRV) analysis): 心臟頻率的變化是隨時(shí)間和頻率分析而變化的, 也提供有正?;肦R。
產(chǎn)品參數(shù):
1) 程序基于64位操作系統(tǒng);
2) 單通道記錄;
3) 實(shí)時(shí)觀察和記錄ECG曲線;
4) 屏幕運(yùn)行時(shí)間:5、10、25或50毫米/秒 ;
5) 持續(xù)的心電(ECG)監(jiān)護(hù)心臟頻率顯示 ;
6) 網(wǎng)絡(luò)噪音濾波(noise-filtering)算法(50/60Hz陷波濾波器);
7) 肌肉運(yùn)動(dòng)(振動(dòng)、顫動(dòng))濾波算法;
8) 采樣頻率:1000采樣/秒/通道 ;
9) 放大數(shù): 10000x ;
10) 輸入阻抗: 10 MΩ symmetric ;
11) 輸入電阻: 50 Ω;
12) 總尺寸:400x300x350 mm;
13) 操縱器 0,05 mm /revolution/25 mm course;
14) 魚(yú)缸體積:20 ml ;
15) 魚(yú)缸尺寸大小: 90x40x20 mm ;
16) 魚(yú)缸材料:陽(yáng)極氧化鋁;
產(chǎn)品相關(guān)文獻(xiàn):
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.