Cited by 147Cardiovascular Syncope and Autonomic DisordersCardiac electrophysiology and arrhythmiasHeart Rate Variability and Autonomic Control

Syncope Due to Idiopathic Paroxysmal Atrioventricular Block

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Brignole, Michele, Deharo, Jean-Claude, De Roy, Luc, Menozzi, Carlo, Blommaert, Dominique, Dabiri, Lara, Ruf, Jean, Guieu, Regis·2011·Journal of the American College of Cardiology

Abstract

Objectives We present data on patients with syncope due to paroxysmal atrioventricular (AV) block unexplainable in terms of currently known mechanisms.Background Paroxysmal AV block is known to be due to intrinsic AV conduction disease or to heightened vagal tone.Methods We evaluated 18 patients presenting with unexplained syncope who had: 1) normal baseline standard electrocardiogram (ECG); 2) absence of structural heart disease; and 3) documentation, by means of prolonged ECG monitoring at the time of syncopal relapse, of paroxysmal third-degree AV block with abrupt onset and absence of other rhythm disturbances before or during the block.Results The study group consisted of 9 men and 9 women, mean age 55 ± 19 years, who had recurrent unexplained syncope for 8 ± 7 years and were subsequently followed up for as long as 14 years (4 ± 4 years on average). The patients had no structural heart disease, standard ECG was normal, and electrophysiological study was negative. In all patients, prolonged ECG monitoring documented paroxysmal complete AV block with 1 or multiple consecutive pauses (mean longest pause: 9 ± 7 s at the time of syncope); AV block occurred without P-P cycle lengthening or PR interval prolongation. During the observation time, no patient had permanent AV block; on permanent cardiac pacing, no patient had further syncopal recurrences.Conclusions Common clinical and electrophysiological features define a distinct form of syncope due to idiopathic paroxysmal AV block characterized by a long history of recurrent syncope, absence of progression to persistent forms of AV block, and efficacy of cardiac pacing therapy.

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Crossref · 10.1016/j.jacc.2010.12.045

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  • Patients with idiopathic AV block had an otherwise normal heart and no sign of conduction disease on ECG and EPS; they had very low plasma adenosine levels and a high induction rate of transient complete heart block during exogenous injections of adenosine.

    “These patients had an otherwise normal heart and no sign of conduction disease on ECG and EPS; they had very low plasma adenosine levels and a high induction rate of transient complete heart block during exogenous injections of adenosine.”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [5]

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  • Cardiac pacing effectively prevents syncopal recurrences in this syndrome.

    “Cardiac pacing effectively prevents syncopal recurrences.112,139,140”
  • No syncope recurrence was observed after permanent cardiac pacing over very long periods of follow-up in patients with idiopathic AV block, and there was no permanent AV block.

    “No syncope recurrence was observed after permanent cardiac pacing over very long periods of follow-up and there was no permanent AV block.”
  • A new clinical entity, idiopathic AV block, has been described in patients with a long history of syncope and in whom paroxysmal AV block could be recorded at the time of syncope recurrence.

    “A new clinical entity, called idiopathic AV block, has recently been described in patients with a long history of syncope and in whom paroxysmal AV block could be recorded at the time of syncope recurrence. 5”

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  1. [16]16. Sanjua ´n R, Facila L, Blasco ML, Garcı ´a-Civera R, Ruiz Granell R, Morell Cabedo S. Case 13. Neuromediated syncope presenting as high grade AV block. In: Garcia-Civera R, Baron-Esquivias G, Blanc JJ, et al., editors. Syncope Cases. Oxford: Blackwell Futura, 2006:38 -40.
  2. [21]21. Burnstock G, Kennedy C. Purinergic receptors in the cardiovascular system. Prog Pharmacol 1986;6:111-32.
  3. [26]26. Moya A, Sutton R, Ammirati F, et al. Guidelines for the diagnosis and management of syncope (version 2009). Eur Heart J 2009;30:2631-71.

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Authors
Brignole, M., Deharo, J.-C., De Roy, L., Menozzi, C., Blommaert, D., Dabiri, L., Ruf, J., & Guieu, R.
Affiliations
  • Presidio Ospedaliero (IT)
  • Hôpital de la Timone (FR)
  • Santa Maria Nuova Hospital (IT)
  • CHU Dinant Godinne UCL Namur (BE)
Corresponding author
Brignole, Michele
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2011-07
Volume
58
Issue
2
Pages
167-173
ISSN
0735-1097 (ISSN-L)
OpenAlex
W1692004657
Cited by
147
References
25
Citations by year
2026: 4 · 2025: 6 · 2024: 4 · 2023: 5 · 2022: 7 · 2021: 11 · 2020: 6 · 2019: 13 · 2018: 13 · 2017: 17 · 2016: 6 · 2015: 9 · 2014: 15 · 2013: 15 · 2012: 11
FWCI
14.72
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Access to Libraries (Université catholique de Louvain (UCL), l'Université de Namur (UNamur) and the Université Saint-Louis (USL-B)) (submittedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Cardiovascular Syncope and Autonomic Disorders
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
Keywords
syncope, paroxysmal atrioventricular block, complete heart block, cardiac pacing, vagal tone, cardiac conduction disorders, recurrent syncope
MeSH terms
Adenosine, Adenosine Triphosphate, Adult, Aged, Electrocardiography, Electrophysiology, Female, Follow-Up Studies, Humans, Male, Middle Aged, Recurrence, Syncope, Time Factors, Atrioventricular Block

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