Cited by 110Cardiovascular Syncope and Autonomic DisordersHeart Rate Variability and Autonomic ControlCardiac electrophysiology and arrhythmias

An Implantable Loop Recorder Study of Highly Symptomatic Vasovagal Patients

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Deharo, Jean-Claude, Jego, Christophe, Lanteaume, André, Djiane, Pierre·2006·Journal of the American College of Cardiology

Abstract

Objectives The aim of this study was to analyze the heart rhythm during spontaneous vasovagal syncope (VVS) in highly symptomatic patients with implantable loop recorders (ILR) and to correlate this rhythm with the heart rhythm observed during head-up tilt test (HUT).Background Heart rhythm obtained during provocative condition is often used to guide therapy in VVS. To date there is no conclusive evidence that the heart rhythm observed during a positive HUT can predict heart rhythm during VVS or that the heart rhythm observed during a spontaneous syncope will be identical to the recurrent syncope.Methods Twenty-five consecutive VVS patients (age 60.2 +/- 17.1 years; 14 women,) presenting with frequent syncopes (6.9 +/- 4.6 episodes/year) and a positive HUT (cardioinhibitory in 8 patients) were implanted with an ILR. Seven of them also had a positive adenosine triphosphate (ATP) test.Results Follow-up was 17.0 +/- 3.6 months. Thirty VVS were observed in 12 patients. Nine episodes showed bradycardia of <40 beats/min or asystole; progressive sinus bradycardia preceding sinus arrest was the most frequent electrocardiographic finding. Twenty-one syncopes occurred without severe bradycardia. The heart rhythm observed during the first syncope was identical to the recurrence. No correlation was found between slow heart rate at the ILR interrogation and a cardioinhibitory HUT response (p = 1.0) or a positive ATP test (p = 1.0).Conclusions In highly symptomatic patients with VVS, the heart rhythm observed during spontaneous syncope does not correlate with the HUT. The heart rhythm during the first spontaneous syncope is identical to the recurrent syncope.

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Crossref · 10.1016/j.jacc.2005.09.043

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  • A positive cardioinhibitory response to tilt testing predicts, with a high probability, an asystolic spontaneous syncope.

    “While a positive cardioinhibitory response to tilt testing predicts, with a high probability, an asystolic spontaneous syncope, the presence of a positive vasodepressor, mixed response, or even a negative response, does not exclude the presence of asystole during spontaneous syncope. 122,123”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [122]

    The Discussion says that the tilt-test response was not predictive of the mechanism of spontaneous syncope. It also reports spontaneous syncope without severe bradycardia in two of four patients with a type 2 (cardioinhibitory) tilt response, contrary to the claimed high-probability prediction of asystole. (LLM, conf=0.92)

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  • A positive cardioinhibitory response to tilt testing predicts, with high probability, asystolic spontaneous syncope.

    “A positive cardioinhibitory response to tilt testing predicts, with high probability, asystolic spontaneous syncope; this finding is relevant for therapeutic implications when cardiac pacing is considered (see section 5.2.6).”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [122]

    The Discussion states that the response during head-up tilt testing was not predictive of the mechanism of spontaneous syncope. It reports spontaneous syncope without severe bradycardia in two of four patients with a type 2 tilt response, contrary to the claimed high-probability prediction of asystole. The paper instead discusses documented rhythm during spontaneous syncope as relevant to pacing decisions (Discussion, p. 591). (LLM, conf=0.94)

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  • The presence of a positive vasodepressor, mixed response, or even a negative response to tilt testing does not exclude the presence of asystole during spontaneous syncope.

    “While a positive cardioinhibitory response to tilt testing predicts, with a high probability, an asystolic spontaneous syncope, the presence of a positive vasodepressor, mixed response, or even a negative response, does not exclude the presence of asystole during spontaneous syncope. 122,123”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [122]

    The Discussion (pp. 587–593) says spontaneous severe bradycardia occurred after type 1 and type 3 tilt responses, not only cardioinhibitory type 2 responses; Table 2 also records sinus arrest after a type 3 response. But the Patients section required a positive tilt test for enrollment, so this study does not establish the claim about a negative tilt-test response. (LLM, conf=0.88)

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  • The presence of a positive vasodepressor, a mixed response, or even a negative response to tilt testing does not exclude the presence of asystole during spontaneous syncope.

    “Conversely, the presence of a positive vasodepressor, a mixed response, or even a negative response does not exclude the presence of asystole during spontaneous syncope. 122,123”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [122]

    The Discussion reports that spontaneous severe bradycardia occurred after type 1 or type 3 tilt responses, and Table 2 documents sinus arrest after a type 3 response. But Table 2 does not document asystole after a type 1 response. The Patients section (p. 588) required a positive tilt test for enrollment, so the study does not establish the claim about negative tilt tests. (LLM, conf=0.87)

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  • Previous studies showed no correlation between AV block induced by ATP and ECG findings documented by ILR during spontaneous syncope.

    “previous studies showed no correlation between AV block induced by ATP and ECG findings (documented by ILR) during spontaneous syncope. 122,123,227”

    From 2018 ESC Guidelines for the diagnosis and management of syncope (2018) · cites this paper as [122]

    The Results (labeled “Out”; page unavailable) report no statistical correlation between a positive ATP test and slow heart rate during ILR-documented recurrences. But the Study protocol defines a positive ATP test as a pause caused by either AV block or sinoatrial block, and the reported correlation concerns slow heart rate, not ECG findings generally. The paper therefore supports the broader lack of predictive correlation, but not an AV-block-specific claim. (LLM, conf=0.85)

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Research works printed but not linked: 1

  1. Brignole M, Gaggioli G, Menozzi C, et al. Clinical features of adenosine sensitive syncope and tilt induced vasovagal syncope. Heart 2000;83:24 -8. 593 JACC Vol. 47, No. 3, 2006 Deharo et al. February 7, 2006:587-93 Heart Rhythm in Vasovagal Syncope

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Authors
Deharo, J.-C., Jego, C., Lanteaume, A., & Djiane, P.
Affiliations
Hôpital de la Timone (FR)
Corresponding author
Deharo, Jean-Claude
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2006-02
Volume
47
Issue
3
Pages
587-593
ISSN
0735-1097 (ISSN-L)
OpenAlex
W24220055
Cited by
110
References
25
Citations by year
2025: 2 · 2024: 4 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 6 · 2014: 9 · 2013: 12 · 2012: 8
FWCI
12.43
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Surgery › Cardiovascular Syncope and Autonomic Disorders
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
vasovagal syncope, implantable loop recorder, head-up tilt, cardioinhibitory syncope, bradycardia, sinus arrest, asystole, cardiac rhythm, syncope recurrence
MeSH terms
Adenosine Triphosphate, Aged, Aged, 80 and over, Female, Heart Rate, Humans, Male, Middle Aged, Recurrence, Electrocardiography, Ambulatory, Tilt-Table Test, Syncope, Vasovagal

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