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Pacing Affects Cardiovascular Endpoints in Patients With Right Bundle-Branch Block (The PACE-RBBB Trial) (PACE-RBBB)

1. august 2016 opdateret af: Duke University
Heart failure (HF) affects 5 million Americans and is responsible for more health-care expenditure than any other medical diagnosis. Approximately half of all HF patients have electrocardiographic prolongation of the QRS interval and ventricular dyssynchrony, a perturbation of the normal pattern of ventricular contraction that reduces the efficiency of ventricular work. Ventricular dyssynchrony is directly responsible for worsening HF symptomatology in this subset of patients. Resynchronization of ventricular contraction is usually achieved through simultaneous pacing of the left and right ventricles using a biventricular (BiV) pacemaker or implantable cardioverter-defibrillator. Clinical trial evidence supporting the use of BiV pacing in patients with prolonged QRS duration was obtained almost exclusively in patients with a left bundle-branch block (LBBB) electrocardiographic pattern. Recent evidence suggests that resynchronization of ventricular contraction in patients with LBBB can be obtained by univentricular left ventricular pacing with equal or superior clinical benefits compared to BiV pacing. Animal studies suggest that ventricular resynchronization can be obtained in subjects with right bundle-branch block (RBBB) through univentricular right ventricular pacing. No clinical trial evidence exists to support the use of BiV pacing in patients with RBBB. Thousands of patients with symptomatic HF and RBBB currently have univentricular ICDs in place for the prevention of sudden cardiac death. Most of these devices are currently programmed to avoid RV pacing. We aim to determine if ventricular resynchronization delivered through univentricular RV pacing improves symptoms in patients with RBBB and moderate to severe HF who have previously undergone BiV ICD implantation for symptomatic heart failure. We further aim to determine if ventricular resynchronization improves myocardial performance and ventricular geometry as detected by echocardiographic measures and quality of life for patients with HF and RBBB. We hypothesize that RV univentricular pacing delivered with an atrio-ventricular interval that maximizes ventricular synchrony is equivalent to BiV pacing for improvement in cardiac performance, HF symptoms, and positive ventricular remodeling in patients with HF and RBBB.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

16

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Forenede Stater
    • North Carolina
      • Durham, North Carolina, Forenede Stater, 27710
        • Duke University Medical Center
      • Durham, North Carolina, Forenede Stater, 27710
        • Durham VA Medical Center

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 og ældre (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Cardiomyopathy of either idiopathic or ischemic etiology
  • NYHA class III, or IV symptoms
  • Sinus rhythm
  • QRS complex duration > 130 msec in ≥ 2 surface ECG leads with RBBB
  • PR interval > 150 msec and < 240 msec
  • Prior implantation of dual chamber BiV ICD with apical RV lead location

Exclusion Criteria:

  • Myocardial infarction, major surgical procedure, or acute cardiac failure crisis requiring inotropes within 6 months of entry into the study
  • Atrial fibrillation or flutter lasting >12 hours within the last 6 months
  • Sick sinus syndrome, complete heart block, or other arrhythmias requiring pacemaker support
  • Pregnancy
  • Any other known condition other than heart failure that could limit exercise time or survival to < 6 months

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: VVI-40 to RV DDD-40 to Bi-V DDD-40
Period 1: Participants assigned to VVI-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to RV DDD-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to Bi-V DDD-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40
Eksperimentel: VVI-40 to Bi-V DDD-40 to RV DDD-40
Period 1: Participants assigned to VVI-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to Bi-V DDD-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to RV DDD-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40
Eksperimentel: Bi-V DDD-40 to VVI-40 to RV DDD-40
Period 1: Participants assigned to Bi-V DDD-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to VVI-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to RV DDD-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40
Eksperimentel: Bi-V DDD-40 to RV DDD-40 to VVI-40
Period 1: Participants assigned to Bi-V DDD-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to RV DDD-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to VVI-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40
Eksperimentel: RV DDD-40 to VVI-40 to Bi-V DDD-40
Period 1: Participants assigned to RV DDD-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to VVI-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to Bi-V DDD-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40
Eksperimentel: RV DDD-40 to Bi-V DDD-40 to VVI-40
Period 1: Participants assigned to RV DDD-40 Participants will then Crossover to Period 2. Period 2: Participants assigned to Bi-V DDD-40 Participants will then Crossover to Period 3. Period 3: Participants assigned to VVI-40
Enhed: VVI-40
Pacing mode set to VVI-40, RV only pacing
Enhed: RV DDD-40
ICD programmed to DDD-40, RV only pacing with aan AV interval producing QRS fusion on surface EKG.
Enhed: BiV DDD-40
ICD programmed to BiV pacing at a lower rate of 40

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
The Primary Endpoint of the Trial Will be a Comparison of the Proportion of Patients in Each of the Three Treatment Groups Who Demonstrate Positive LV Remodeling, Defined as a Decrease in LV End Systolic Diameter of >5mm.
Tidsramme: 6 months
6 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Venstre ventrikulær ejektionsfraktion (LVEF)
Tidsramme: 6 måneder
6 måneder
Secondary Echocardiographic Endpoints
Tidsramme: 6 months
Comparisons of the derived velocity-time integral calculated on the aortic continuous wave Doppler-spectrogram, RV end-diastolic size, RV EF, mitral and tricuspid regurgitation severity, and estimated RV systolic pressure.
6 months
Arrhythmic Events
Tidsramme: 6 months
To determine if pacing mode impacts the frequency of ventricular arrhythmias, the incidence of ventricular tachyarrhythmia episodes on device interrogation will be compared between treatment group assignments. An episode will be considered ventricular arrhythmia if it lasts longer than 30 seconds or requires anti-tachycardia pacing or high voltage device therapy for termination.
6 months
Minnesota Quality of Life Questionnaire
Tidsramme: 6 months
This is a standardized method for assessing quality of life in patients with heart failure. It asks 21 questions and measures the impact HF has on a subject's life. Each question is rated 0-5. The total score for the 21 items can range from 0 to 105. Higher scores indicate more burden of disease on quality of life.
6 months
6-minute Walk Distance
Tidsramme: 6 months
6-minute walk distance was the distance that a participant could walk in 6 minutes.
6 months
NYHA Function Class
Tidsramme: 6 months
The New York Heart Association (NYHA) Functional Classification places patients in one of four categories based on how much they are limited during physical activity. Class I means there is no limitation of physical activity and Class IV means a person is unable to carry on any physical activity without discomfort/symptoms of heart failure at rest.
6 months
Left Ventricular End-diastolic Size
Tidsramme: 6 months
6 months

Samarbejdspartnere og efterforskere

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

Sponsor

Duke University

Samarbejdspartnere

American Heart Association

Efterforskere

  • Ledende efterforsker: Brett D Atwater, MD, Duke University

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

1. januar 2011

Primær færdiggørelse (Faktiske)

1. august 2014

Studieafslutning (Faktiske)

1. august 2014

Datoer for studieregistrering

Først indsendt

22. juli 2010

Først indsendt, der opfyldte QC-kriterier

22. juli 2010

Først opslået (Skøn)

26. juli 2010

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

23. september 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

1. august 2016

Sidst verificeret

1. august 2016

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • Pro00025144
  • 10CRP3630033 (Andet bevillings-/finansieringsnummer: American Heart Association)

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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