资源描述:
《心电信号的处理PPT》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、Ch4:心电信号的处理心电图的产生,心电图处理的基本思路,时间上:动态和静态,空间上:心肌电特性的空间离散度,心电图处理和分析的发展,NankaiUniversity,CYLI,2021/7/231Biomedicalsignalprocessing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-90-6
2、00+200心室肌细胞动作电位示意图1234300msNankaiUniversity,CYLI,2021/7/232Biomedicalsignalprocessing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
3、肌细胞兴奋,NankaiUniversity,CYLI,2021/7/233Biomedicalsignalprocessing心脏传导系统NankaiUniversity,CYLI,2021/7/234BiomedicalsignalprocessingEnglishterms窦房结:sinusnode,心房:atrium,心室:ventricle,房室结:atrioventricularnode(junction),希氏束:bundleofHis,普金野纤维:Pukinjefibres,心脏表面(心外膜):epicardium,
4、心内膜:endocardium体表:bodysurfaceNankaiUniversity,CYLI,2021/7/235Biomedicalsignalprocessing心电信号的形成(3)心电图(electrocardiogram,ECG)的产生电流源:每个心肌细胞的除极和复极过程等效于一个偶极子层(dipolelayer)容积导体(volumeconductor):人体组织是导电的,看作是一个容积导体,心电向量:所有心肌细胞的偶极子场的向量和,心电图:所有心肌细胞的偶极子场在容积导体内产生电场,从而有电位差产生,即心电图。体
5、表心电图,心外膜、心内膜电图,希氏束电图,NankaiUniversity,CYLI,2021/7/236Biomedicalsignalprocessing典型心电信号波形P,QRS,ST,TS-T段QRSTPQTNankaiUniversity,CYLI,2021/7/237Biomedicalsignalprocessing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-channeldataacqui
6、sitionsystem),,电极背心,(electrodevest)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,2021/7/238BiomedicalsignalprocessingBodysurfacemappingNankaiUniversity,CYLI,2021/7/239Biomedicals
7、ignalprocessingEpicardialelectrodesockNankaiUniversity,CYLI,2021/7/2310Biomedicalsignalprocessing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=EF-ER,III=EF-ELNankaiUniversity,CYLI,2021/7/2311Biomedicalsign
8、alprocessing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+-Nan