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  • 1
    Electronic Resource
    Electronic Resource
    The Shocking Truth (2001)
    Oxford, UK : Blackwell Science Inc
    Journal of cardiovascular electrophysiology 12 (2001), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1540-8167.2001.01162.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral Estimation of the Electrocardiogram (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 601 (1990), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1990.tb37301.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in Late Potential Measurements as a Function of Decreasing Bandwidth (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 2 (1991), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Bandwidth of Late Potentials Introduction: Limited bandwidth systems such as Holter recorders are being used to record cardiac late potentials. Standard late potential systems have a low-pass frequency of 300 Hz. This suggests that Holter tape systems may significantly distort the late potential measurements, when compared to standard late potential systems. Methods and Results: Signal-averaged recordings were obtained with an analog bandwidth of 0.05-300 Hz. Digital filters were then used to do high-pass filtering and low-pass filtering. All XYZ signal-averaged recordings were low-pass filtered at frequencies of 250, 150, 100, 75, 50, and 25 Hz using a second order Butterworth filter. A fourth order 40 Hz bidirectional high-pass filter was then applied to each set of recordings. The QRS duration (QRSd) was measured in the filtered vector magnitude. Thirty-eight syncope patients who had negative electrophysiologic studies for ventricular tachycardia, no prior infarction, normal ejection fractions (〉 50%), and a QRSd 〈120 msec served as the negative late potential group. Thirty-seven patients with clinical ventricular tachycardia, a positive electrophysiologic study for ventricular tachycardia, and a QRSd〉120 msec served as the positive late potential group. Conclusions: A statistically significant lengthening of the QRSd (P 〈0.05) was observed in the patients with late potentials between the 250 Hz and 25 Hz low-pass filter. There was a statistically significant shortening of the QRSd in the negative late potential patients between 250 Hz and 25 Hz, as well as between 250 Hz and 50 Hz, with P〈0.05 in both cases. Thus, significant changes in late potentials are seen in limited bandwidth recordings that may limit the clinical usefulness of such systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1991.tb01352.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Identifying the End of Ventricular Activation: (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 5 (1994), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Late Potentials: Epicardial and Body Surface. Introduction: Identification of the end of the QRS is perhaps the single most important feature obtained from the high resolution signal-averaged electrocardiogram (SAECG). This point relies on computer algorithms to select a point ahove the noise levels. Prior studies to suhstantiate this approach using eleetrograms for comparison have demonstrated many examples of the hody surface recordings failing to detect the full extent of the late potentials. Methods and Results: An animal model that generates late potentials was used in conjunction with epicardial cardiac mapping system to systematically examine the rea.sons for these failures. In I I of 13 dogs we found a concordance hetween the signal-averaged recordings and Ihe epicardial recordings within 5 msec. The two discordant studies were attrihuted to a failure of epicardial mapping to record all late potential sources. Also, a means of accurately comparing measurements from the two recording technologies was required in this study as well as a new definition for identifying the end of activation currents in epicardial eleetrograms. Conclusion: To achieve these results required approaches different from those used in the clinical setting to record the SAECG. These include: (1) the analysis of individual XYZ leads as opposed to the vector magnitude derived from these leads; (2) visual identification of very low level signals, as automatic algorithms often fail to detect low level signals: and (3) the use of finite impulse response digital filters instead of the bidirectional Butterworth filter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1994.tb01112.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The Signal-Averaged Electrocardiogram: (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 7 (1996), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Update on SAECG. The signal-averaged electrocardiogram (SAECG) facilitates noninvasive recording of low-amplitude cardiac signals such as ventricular late potentials. The SAECG has been used to accurately predict life-threatening ventricular tachyarrhythmias in patients after acute myocardial infarction and with nonischemic dilated cardiomyopathy, and to screen for inducible ventricular tachycardia in patients with unexplained syncope and with nonsustained ventricular tachycardia. This review focuses on currently accepted methodology and clinical and research applications of the SAECG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1996.tb00472.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Epicardial Maps of Atrial Fibrillation After Linear Ablation Lesions (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 8 (1997), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Maps of AF After Ablation. Introduction: The purpose of this study was to investigate the mechanisms by which atrial linear ablation lesions eliminate atrial fibrillation (AF). Methods and Results: With an array of 112 unipole, epicordial maps of electrically induced AF in 6 dogs (acute group), self-sustained AF in 6 dogs (chronic group), and sinus rhythm and atrial pacing in 3 dogs (control group) were analyzed before and after creating linear radiofrequency ablation lesions in both atria that eliminated the AF. In the acute and chronic groups, activation maps showed multiple wavelets with complex patterns of activation and reentry during AF. Conduction velocity and the number, size, and complexity of wavelets did not change, whereas median fibrillatory cycle length increased with the number of linear lesions. In the control group, refractoriness and conduction velocity were unaffected by the number of lesions. Conclusions: In these models of AF, linear lesions that eliminate AF increase the cycle length of AF without changing conduction velocity, number or size of wavelets, or complexity of activation patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1997.tb00628.x
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    Paper (German National Licenses)
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