目的:探讨短PR综合征PR缩短的电生理机制及临床意义。方法:对具有短PR(PR<0.12秒)和QRS波正常的15例患者进行食管电生理检查并分析,并与对照组进行对比。结果:15例短PR患者能保持1∶1房室传导之最快S1S1频率,均≥200次/m in。S1R间...目的:探讨短PR综合征PR缩短的电生理机制及临床意义。方法:对具有短PR(PR<0.12秒)和QRS波正常的15例患者进行食管电生理检查并分析,并与对照组进行对比。结果:15例短PR患者能保持1∶1房室传导之最快S1S1频率,均≥200次/m in。S1R间期均≤200m s,其中11例S1R随着心房起搏频率增快,间期有所延长,但延长值≤70 m s,4例S1R长度固定不变。3例S2R跳跃延长≥70 m s,其中1例有心房回波,1例发生折返性室上性心动过速,AVERP平均值<250 m s。与对照组相比S1R、S2R明显缩短,差异有显著性(P<0.01)。结论:PR缩短的原因是由房室结的解剖或电生理特性所决定的,短PR与折返性心动过速的形成无关,但心房扑动、颤动时,可引起极快的心室反应。展开更多
We investigate the stochastic resonance （SR） phenomenon induced by the periodic signal in a metapopulation system with colored noises. The analytical expression of signal-to-noise is derived in the adiabatic limit. ...We investigate the stochastic resonance （SR） phenomenon induced by the periodic signal in a metapopulation system with colored noises. The analytical expression of signal-to-noise is derived in the adiabatic limit. By numerical calculation, the effects of the addictive noise intensity, the multiplicative noise intensity and two noise self-correlation times on SNR are respectively discussed. It shows that： （i） in the case that the addictive noise intensity M takes a small value, a SR phenomenon for the curve of SNR appears; however, when M takes a large value, SNR turns into a monotonic function on the multiplicative noise intensity Q. （ii） The resonance peaks in the plots of the multiplicative noise intensity Q versus its self-correlation time Vl and the addictive noise intensity M versus its self-correlation time ~2 translate in parallel. Mean- while, a parallel translation also appears in the plots of vl versus Q and v2 versus M. （iii） The interactive effects between self-correlation times Vl and v2 are opposite.展开更多
In this paper we establish Levin type comparison theorems for certain second order differential equations. The results obtained here generalize and extend some of the earlier ones related to the Levin's comparison...In this paper we establish Levin type comparison theorems for certain second order differential equations. The results obtained here generalize and extend some of the earlier ones related to the Levin's comparison theorems.展开更多
文摘目的:探讨短PR综合征PR缩短的电生理机制及临床意义。方法:对具有短PR(PR<0.12秒)和QRS波正常的15例患者进行食管电生理检查并分析,并与对照组进行对比。结果:15例短PR患者能保持1∶1房室传导之最快S1S1频率,均≥200次/m in。S1R间期均≤200m s,其中11例S1R随着心房起搏频率增快,间期有所延长,但延长值≤70 m s,4例S1R长度固定不变。3例S2R跳跃延长≥70 m s,其中1例有心房回波,1例发生折返性室上性心动过速,AVERP平均值<250 m s。与对照组相比S1R、S2R明显缩短,差异有显著性(P<0.01)。结论:PR缩短的原因是由房室结的解剖或电生理特性所决定的,短PR与折返性心动过速的形成无关,但心房扑动、颤动时,可引起极快的心室反应。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11072107,91016022,and 11232007)the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures of Nanjing University of Aeronautics and astronautics,China(Grant No.0113G01)+1 种基金the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province,China(Grant No.13KJB110006)the Project Fund of Jiangsu University of Science and Technology,China(Grant No.633051203)
文摘We investigate the stochastic resonance （SR） phenomenon induced by the periodic signal in a metapopulation system with colored noises. The analytical expression of signal-to-noise is derived in the adiabatic limit. By numerical calculation, the effects of the addictive noise intensity, the multiplicative noise intensity and two noise self-correlation times on SNR are respectively discussed. It shows that： （i） in the case that the addictive noise intensity M takes a small value, a SR phenomenon for the curve of SNR appears; however, when M takes a large value, SNR turns into a monotonic function on the multiplicative noise intensity Q. （ii） The resonance peaks in the plots of the multiplicative noise intensity Q versus its self-correlation time Vl and the addictive noise intensity M versus its self-correlation time ~2 translate in parallel. Mean- while, a parallel translation also appears in the plots of vl versus Q and v2 versus M. （iii） The interactive effects between self-correlation times Vl and v2 are opposite.
文摘In this paper we establish Levin type comparison theorems for certain second order differential equations. The results obtained here generalize and extend some of the earlier ones related to the Levin's comparison theorems.
