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《最新心电信号处理幻灯片.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、心电信号处理心电信号的形成（1）心肌细胞的动作电位心肌细胞除极和复极的电生理现象,极化状态(polarised):静息电位(restingpotential),动作电位(actionpotential,AP):除极(depolarisation)和复极(repolarisation),mV-90-600+200心室肌细胞动作电位示意图1234300msNankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日2Biomedicalsignalprocessing
2、心电信号的形成（2）电兴奋的传导(conductionorspreadofelectricalexcitation)窦房结:心脏的起搏兴奋点,其细胞自发产生50-100次/分的可传导AP,心房的传导:心房传导束-->右心房-->左心房传导系统的传播:房室束-->希氏束-->左、右分支-->普金野（Purkinje）纤维网->心室肌,电兴奋通过Purkinje网使心室肌细胞兴奋，NankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日3Biomedicalsig
3、nalprocessing典型心电信号波形P,QRS,ST,TS-T段QRSTPQTNankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日7Biomedicalsignalprocessing心电图的记录 (RecordingofECG)标准导联,肢体导联,胸导联,体表多部位标测(bodysurfacemapping),32-512通道的数据采集系统(multi-channeldataacquisitionsystem),,电极背心,(electrodeve
4、st)心脏表面的多部位标测(epicardialmapping),多通道的数据采集系统电极套(electrodesock)心脏内膜的多部位标测(endocardialmapping),多通道的数据采集系统导管(catheter)和伞电极NankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日8BiomedicalsignalprocessingBodysurfacemappingNankaiUniversity,CYLI,NankaiUniversity,CY
5、LI,2021/4/18星期日9BiomedicalsignalprocessingEpicardialelectrodesockNankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日10Biomedicalsignalprocessing标准导联(1)12标准导联(standardleads)标准I，II，III肢体导联(bipolarlimbleads),IIIIIIRFLR:rightarmL:leftarmF:leftfootI=EL-ER,II=E
6、F-ER,III=EF-ELNankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日11Biomedicalsignalprocessing标准导联(2)加压肢体导联标准aVR,aVL,aVF(augmentedunipolarlimbleads),LWilsonterminal:C点的电位,aVL和aVF的连接相似R/2RRRFCaVR+-NankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日12Bi
7、omedicalsignalprocessing标准导联(3)单极胸导联V1-V6(unipolarprecordialleads),precordial:chestwall,中心电端(Wilsonterminal)V1-V6,胸前电极分别与中心电端的电位差,NankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日13Biomedicalsignalprocessing心电信号的畸变心脏的病变：传导阻滞，早搏，室颤、房颤,心肌缺血、梗塞等,QRS变宽,ST段位
8、移出现,心率变化等,来自心脏外的干扰信号：50Hz工频干扰肌电干扰，10-300Hz,呼吸的干扰，使基线漂移加剧，NankaiUniversity,CYLI,NankaiUniversity,CYLI,2021/4/18星期日14Biomedicalsignalprocessing心电信号的预处理抑制工频干扰，基线纠漂，NankaiUniversity,CY
