Abstract:
INTRODUCTION:The advent of signal-averaged ECG (SAECG) systems for P wave analysis has made it important to determine if the use of different filtering techniques in these systems is diagnostically equivalent. METHODS AND RESULTS:Three different high-pass filtering techniques and two cutoff frequency values were used: 29- and 40-Hz Butterworth bidirectional filter (BB29, BB40), 29- and 40-Hz Butterworth unidirectional filter (UB29, UB40), and 29- and 40-Hz least mean square filter (LMS29, LMS40). Normal healthy volunteers (n = 36) and patients with documented paroxysmal atrial fibrillation (n = 23) were analyzed. A custom-built SAECG system and standard bipolar orthogonal leads were used. Noise was reduced to < 0.3 microV. P wave total duration, root mean square voltage of the terminal 20, 30, and 40 msec of the filtered vector magnitude, and the area under the curve between the onset and offset of averaged unfiltered and filtered P wave vector magnitude were analyzed. Only the duration of the P wave showed statistically significant differences between groups, being longer in the PAF group for all filters and cutoff frequencies studied. A bias increment of approximately 20 msec was detected in unidirectional and least mean square filters as compared to the bidirectional filter. Sensitivity, specificity, and predictive accuracy were > 70% for all filters; the BB40 filter yielded the best performance. CONCLUSION:The normality limits derived from one filter cannot be applied directly to recordings obtained from the other filters. Critical limits must be established individually for different software settings.
journal_name
J Cardiovasc Electrophysioljournal_title
Journal of cardiovascular electrophysiologyauthors
Valverde ER,Quinteiro RA,Bertran GC,Arini PD,Glenny P,Biagetti MOdoi
10.1111/j.1540-8167.1998.tb00910.xsubject
Has Abstractpub_date
1998-03-01 00:00:00pages
253-60issue
3eissn
1045-3873issn
1540-8167journal_volume
9pub_type
临床试验,杂志文章abstract::Dual chamber pacemakers have inbuilt advanced safety systems such as ventricular safety standby (crosstalk detection) to prevent ventricular oversensing resulting in inappropriate pacing inhibition. We describe a case where this safety mechanism does not reliably work and the management required to rectify the situati...
journal_title:Journal of cardiovascular electrophysiology
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
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abstract:INTRODUCTION:Catheter ablation for paroxysmal AF (PAF) is limited by an unacceptable recurrence rate, mainly due to pulmonary vein (PV) reconnection. Strategies to minimize reconnection include adenosine infusion and also a waiting period of 30 minutes after PV isolation. The aim of the present study was to assess whet...
journal_title:Journal of cardiovascular electrophysiology
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更新日期:2009-12-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
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更新日期:2012-02-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.13738
更新日期:2018-11-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.2010.01991.x
更新日期:2011-08-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.2005.00248.x
更新日期:2005-12-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.12315
更新日期:2014-03-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.14172
更新日期:2019-11-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 临床试验,杂志文章
doi:10.1111/j.1540-8167.1998.tb00922.x
更新日期:1998-04-01 00:00:00
abstract::Autonomic dysfunction may occur as a consequence of radiofrequency (RF) catheter ablation of a variety of supraventricular tachycardias. Effects suggestive of autonomic dysfunction that may be seen acutely during the ablation procedure include sudden profound slowing of the sinus rate or transient AV block. These abno...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,评审
doi:10.1111/j.1540-8167.1996.tb00550.x
更新日期:1996-05-01 00:00:00
abstract:INTRODUCTION:The "critical point hypothesis" for induction of ventricular fibrillation has previously been extended to infer the coexistence of four critical points, and hence four simultaneous spiral reentries or a quatrefoil reentry, resulting from only one premature stimulus delivered to the same location as the pac...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.1999.tb00715.x
更新日期:1999-04-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.12473
更新日期:2014-11-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.1995.tb00439.x
更新日期:1995-08-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.13805
更新日期:2019-03-01 00:00:00
abstract::It is well established that impulse propagation in cardiac tissue is determined by the interaction between active membrane properties and the passive electrical characteristics of the network formed by individual myocytes. In the past, the intricate microarchitecture of intact cardiac tissue and the limited spatial re...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,评审
doi:10.1111/j.1540-8167.1995.tb00428.x
更新日期:1995-07-01 00:00:00
abstract:INTRODUCTION:accurate selection of patients for vasovagal syncope studies requires strong risk stratification and knowledge of the natural history of syncope. We aimed to test the hypothesis that recent history of vasovagal syncope compared to distant history better predicts subsequent recurrence of syncope. METHODS A...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1540-8167.2010.01848.x
更新日期:2010-12-01 00:00:00
abstract:BACKGROUND:Transseptal puncture (TP) is a prerequisite for LA ablations. LA access can be gained by catheter probing in case of PFO (trans-PFO method) or puncture of the interatrial septum (IAS) using a transseptal needle. A 2nd access can again be gained via PFO, a 2nd TP or catheter probing of the previous puncture s...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.12356
更新日期:2014-05-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.1997.tb01003.x
更新日期:1997-10-01 00:00:00
abstract::Electrical instability of the heart has numerous congenital origins. This review approaches the problems from a morphological standpoint, utilizing selected examples from my own studies of the human cardiac conduction system performed during the last three decades. Subjects discussed include multifocal Purkinje cell t...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,评审
doi:10.1111/j.1540-8167.1993.tb01256.x
更新日期:1993-12-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/jce.12437
更新日期:2014-07-01 00:00:00
abstract:INTRODUCTION:Several studies have shown that the fast pathway is more responsive to adenosine than the slow pathway in patients with AV nodal reentrant tachycardia. Little information is available regarding the effect of adenosine on anterograde and retrograde fast pathway conduction. METHODS AND RESULTS:The effects o...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.1998.tb00121.x
更新日期:1998-08-01 00:00:00
abstract:INTRODUCTION:Rhodiola, a popular plant in Tibet, has been proven to decrease arrhythmia. The aim of this study was to elucidate the molecular mechanism and electrophysiological properties of rhodiola in the suppression of atrial fibrillation. METHODS:This study consisted of 3 groups as follows: Group 1: normal control...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
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更新日期:2016-09-01 00:00:00
abstract::Application of radiofrequency energy to arrhythmogenic substrates after careful cardiac mapping could ensure a high success rate in eliminating certain types of tachyarrhythmias. Future studies of catheter ablation will focus on how to improve ablation efficacy and achieve a better result in various types of tachyarrh...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,评审
doi:10.1111/j.1540-8167.1995.tb00360.x
更新日期:1995-10-01 00:00:00
abstract:INTRODUCTION:The pulmonary veins (PVs) are a dominant source of triggers initiating atrial fibrillation (AF). While recent evidence implicates these structures in the maintenance of paroxysmal AF, their role in permanent AF is not known. The current study aims to compare the contribution of PV activity to the maintenan...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.2006.00546.x
更新日期:2006-09-01 00:00:00
abstract:BACKGROUND:Close association between atrial fibrillation (AF) and brain natriuretic peptide (BNP) has been demonstrated by several studies. Important gender differences exist in AF patients including a higher plasma BNP level in women. Therefore, it is imperative to evaluate the relationship between AF and BNP separate...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.2011.02036.x
更新日期:2011-08-01 00:00:00
abstract:INTRODUCTION:To determine if collagenase-dispersed epicardial myocytes overlying myocardial infarction reproduce the same altered electrophysiology observed in intact epicardium, multicellular tissue preparations and enzymatically-dispersed myocytes from ischemically-injured canine subepicardium were examined 1 and 4 d...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1111/j.1540-8167.1993.tb01208.x
更新日期:1993-02-01 00:00:00
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journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
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更新日期:2008-04-01 00:00:00
abstract:INTRODUCTION:In patients with permanent pacemakers, mode switching events often are interpreted as surrogate markers for atrial tachyarrhythmias. The aim of this study was to determine the accuracy of automatic mode switching algorithms in patients with permanent pacemakers for the diagnosis of atrial tachyarrhythmias....
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章
doi:10.1046/j.1540-8167.2004.03537.x
更新日期:2004-07-01 00:00:00
abstract::The heart's pacemaker, the sinoatrial node, does not consist of a group of uniform sinoatrial node cells embedded in atrial muscle. Instead, it is a heterogeneous tissue with multiple cell types and a complex structure. Evidence suggests that from the periphery to the center of the sinoatrial node, there is a gradient...
journal_title:Journal of cardiovascular electrophysiology
pub_type: 杂志文章,评审
doi:10.1046/j.1540-8167.2003.02307.x
更新日期:2003-01-01 00:00:00