Prevalence and clinical correlates of non-Wenckebach, narrow-complex second-degree atrioventricular block detected by ambulatory ECG
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Cited by (22)
Fortuitous Identification of Fluctuating AV Block: A Case Report
2019, Journal of Emergency MedicineCitation Excerpt :Vagally mediated AVB must be differentiated from paroxysmal, bradycardia-dependent AVB, because bradycardia-dependent AVB may progress to persistent AVB and require pacemaker placement (6,7). Depression of both sinus and AV node conduction must be present to diagnose vagally mediated AVB, and in our case, three ECG characteristics are demonstrative: 1) An irregularly and subtly lengthened (by 40 ms) P-P interval with delayed Ps that are occasionally synchronous with junctional escape complexes (Figures 2 and 3); 2) heterogeneous presentation of AVB including first degree (Figure 1), second degree Type 1 (Figure 2), 2:1 (Figures 2 and 3), and third degree (Figure 3); and 3) resumption of AV conduction upon sinus acceleration (shortened P-P interval) with significant PR prolongation (Figure 1) (5,6,8). In comparison, bradycardia-dependent AVB will typically demonstrate unchanged P-P intervals, constant PR intervals, additional conduction abnormalities such as bifascicular or bundle branch block, and initiation by premature complexes or tachycardia—all features that are absent from the ECGs in our case (7,9).
Syncope and paroxysmal atrioventricular block
2017, Journal of ArrhythmiaCitation Excerpt :Differential diagnosis may be difficult in cases with slight increases in PP intervals, which is consistent with sinus arrhythmia. According to some authors [19,20], an increase in this interval of only 40 ms suggests that the block is of vagal origin. This value of 40 ms is arbitrary, and a much more evident slowing of the sinus rate should probably be documented [14].
Atrioventricular Conduction System Disease
2016, Clinical Cardiac Pacing, Defibrillation and Resynchronization TherapyPacing for Atrioventricular Conduction System Disease
2011, Clinical Cardiac Pacing, Defibrillation and Resynchronization TherapyPacing for Atrioventricular Conduction System Disease
2007, Clinical Cardiac Pacing, Defibrillation, and Resynchronization TherapyPacing for atrioventricular conduction system disease
2006, Clinical Cardiac Pacing, Defibrillation and Resynchronization Therapy