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Investigation of Substrates Associated With the Recurrence of Atrial Fibrillation After PV Cryoablation (SubstrateAF)

The two main mechanisms for atrial fibrillation (AF) recurrence after cryoablation include Pulmonary vein (PV) reconnection and the presence of non-PV associated arrhythmic focuses. The aim of this study is to investigate the prevalence of each mechanism and if biomarkers may be used to predict of these events.

Eighty patients with paroxysmal or persistent AF will undergo PV isolation with cryoablation followed by loop recorder implantation. Patients in whom atrial tachyarrhythmias recur during 12 months follow-up (outside of the 3-month post procedure blanking window) will be offered a second electrophysiology study (EP) study to assess PV isolation and non-PV focuses and further ablation performed as required.

At baseline blood samples will be taken to investigate the correlation between specific biomarkers and both the incidence and type of recurrence. The correlation between recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and elevated baseline levels of NT-ProBNP, CRP, TNF, MMP1 will be pre-specified.

40 consecutive patients will have a biopsy taken from the intraventricular and interatrial septum to investigate the correlation between myocardial inflammation, the presence of fibrosis and recurrence of atrial tachyarrhythmias. Correlation between biomarkers of inflammation and biopsy-proven myocardial inflammation or fibrosis will be assessed.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

The two main mechanisms for atrial fibrillation (AF) recurrence after cryoablation include Pulmonary vein (PV) reconnection and the presence of non-PV associated arrhythmic focuses. The aim of this study is to investigate the prevalence of each mechanism and if biomarkers may be used to predict these events.

Eighty patients with paroxysmal or persistent AF will undergo PV isolation with cryoablation followed by loop recorder implantation. Patients in whom atrial tachyarrhythmias recur during 12 months follow-up (outside of the 3-month post procedure blanking window) will be offered a second EP study to assess PV isolation and non-PV focuses and further ablation performed as required. Recurrence will be defined as an episode of atrial tachyarrhythmia (AF, atypical atrial flutter, or atrial tachycardia) on loop recorder with a duration greater than 30 seconds or ECG document atrial tachyarrhythmia. The incidence of atrial tachyarrhythmia recurrence, and its association with symptoms after the index PV cryoballoon isolation, will be assessed.

At baseline blood samples will be taken to assess levels of N-terminal pro brain natriuretic peptide (NT-proBNP), High-sensitivity C-reactive protein (high-sensitive CRP), Tumor Necrosis Factor (TNF), Interleukin 1 beta (IL1B), Fatty acid binding protein (FABP), Matrix metalloproteinase-1 (MMP1), Matrix metalloproteinase-3 (MMP3), Matrix metalloproteinase-9 (MMP9), Transforming growth factor beta 1 (TGF-beta1), Tissue inhibitor of metalloproteinases 1 (TIMP-1), Fibroblast growth factor 9 (FGF-9). Correlation between recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and elevated baseline levels of NT-ProBNP, CRP, TNF, MMP1 will be pre-specified. We will look with receiver operating characteristic (ROC) curve analysis the level of biomarkers which predict recurrence of atrial tachyarrhythmias with the best ratio between sensitivity and specificity.

40 consecutive patients will have a biopsy taken from the intraventricular and interatrial septum to investigate the correlation between myocardial inflammation, the presence of fibrosis and recurrence of atrial tachyarrhythmias. Correlation between biomarkers of inflammation and biopsy-proven myocardial inflammation or fibrosis will be assessed.

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

100

Kontakter og lokationer

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Studiesteder

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 80 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Patients 18-80 years old with symptomatic paroxismal or persistant atrial fibrillation (EHRA scale 2b-4)

Beskrivelse

Inclusion Criteria:

• Patient with paroxysmal/persistent atrial fibrillation (EHRA scale 2b-4)

Exclusion Criteria:

  • prior interventions for AF
  • permanent AF
  • contraindications to oral anticoagulation or heparin
  • chronic kidney disease requiring dialysis
  • untreated hypo- or hyperthyroidism
  • breast feeding
  • pregnancy
  • chronic kidney disease requiring dialysis
  • decompensated heart failure
  • stroke within the last 3 months
  • myocardial infarction within the last 3 months
  • Percutaneous coronary intervention or Coronary Artery Bypass Grafting within the last 3 months
  • active myocarditis
  • artificial valve replacement surgery
  • severe mitral or aortic stenosis
  • coronary artery disease requiring revascularization
  • heart transplant

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Atrial tachyarrhythmia recurrence
Tidsramme: 1 year
Atrial tachyarrhythmias recurrence by ECG, Holter monitoring or loop recorder after 3 months of blanking period
1 year

Sekundære resultatmål

Resultatmål
Tidsramme
The prevalence of PV reconnection and non-PV focuses as substrate of atrial tachyarrhythmia after cryoablation
Tidsramme: 1 year
1 year
The difference in baseline NT-ProBNP levels between those patients with recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and those without at 12 months
Tidsramme: 1 year
1 year
The difference in baseline CRP levels between those patients with recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and those without at 12 months
Tidsramme: 1 year
1 year
The difference in baseline TNF levels between those patients with recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and those without at 12 months
Tidsramme: 1 year
1 year
The difference in baseline MMP1 levels between those patients with recurrence of atrial tachyarrhythmias due to non-PV associated arrhythmic focuses and those without at 12 months
Tidsramme: 1 year
1 year
The difference in baseline NT-ProBNP levels between those patients with recurrence of atrial tachyarrhythmias and those without at 12 months
Tidsramme: 1 year
1 year

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

3. april 2017

Primær færdiggørelse (Faktiske)

30. oktober 2019

Studieafslutning (Faktiske)

30. oktober 2019

Datoer for studieregistrering

Først indsendt

2. juli 2018

Først indsendt, der opfyldte QC-kriterier

2. juli 2018

Først opslået (Faktiske)

16. juli 2018

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

13. januar 2020

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

10. januar 2020

Sidst verificeret

1. januar 2020

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 01-04/18

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

Studerer et amerikansk FDA-reguleret lægemiddelprodukt

Ingen

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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