摘要
为探讨ＱＲＳ波群中切迹的频率特性、能量特性及切迹发生机理，运用多采样率线性小波转换的三维频谱分析，观察兔急性心肌缺血时ＱＲＳ波群中的切迹段（Ｎ），Ｒ波峰段（ＲＰ）及Ｓ波底段（ＳＢ）的下限频率（ＬＦ）和高频相对能量（Ｗ值）的变化。结果：与对照组及缺血前相比，心肌缺血４ｈ后ＱＲＳ波群中的Ｎ、ＲＰ、ＳＢ三段ＬＦ及Ｗ值明显升高（Ｐ均＜０．０１），尤其是Ｎ段的ＬＦ和Ｗ值升高更明显；每组内Ｎ、ＲＰ、ＳＢ三段间比较，Ｎ段的ＬＦ及Ｗ值明显高于ＲＰ及ＳＢ段（Ｐ＜０．０１）。结论：①小波转换的三维频谱分析是一种可行的心电信号分析方法。②切迹是一种含高频成分和高频能量较多的心电信号，其频谱呈宽带连续分布，最高频率可达４００Ｈｚ以上。③切迹发生的机制可能与心肌组织的各向异性、心电活动的非同步性及心肌细胞的后除极、折返形成等有关。
In order to research the frequency and energy characteristics and mechanisms of notches in QRS complexes,three dimensional spectrum analysis based on wavelet transform was applied to observed low limit frequency (LF) and relative energy of high frequency components (W value) concealed in notch segment (N)R wave peak segment (RP) and S wave bottom segment (SB) in QRS complexes of myocardial ischemia rabbits.Results:LF and W value in ischemic group were remarkably higher than that before ischemic and in control group (P<0.01),especially,LF and W value of N segment were the highest as compared with those of RP and SB segment in two groups with significantly statistic difference (P<0.01).Conclusions:Three dimensional spectrum analyzsis based on wavelet transform is a practical way to analyze electrocardiac signals.Notch contains more high frequency components and high frequency energy than the others parts of QRS complexes.The spectrum of notch is continuously distributed,its highest frequency is above 400 Hz.Maybe the machanisms of notch has something to do with the anisotropy of myocardial tissue,the disnychronization of the electrocardial activity,afterdepolarization,reenty and so on .
出处
《中国心脏起搏与心电生理杂志》
1999年第2期105-107,共3页
Chinese Journal of Cardiac Pacing and Electrophysiology
关键词
QRS波群切迹
三维频谱分析
心肌缺血
兔
QRS complex notchThree dimensional spectrumMyocardial ischemiaRabbit
