A Pilot Study Comparing the Programmed Delay Between the Atrial and Ventricle Interval (BRAVO-CRT)
A Pilot Study of theRelationship Between Atrio-Ventricular Delay and Changes in Biochemical Markers of Chronic Heart Failure During Cardiac Resynchronization Therapy (BRAVO-CRT)
The idea of this study is to compare different ways of setting up a pacemaker, using blood tests to give us information about how well it's working. We hope to learn if we can use this approach to figure out the best pacemaker setup ("programming") for each individual patient.
The setting we propose to adjust is the timing between the impulse sent between top and bottom chambers.
Panoramica dello studio
Stato
Condizioni
Intervento / Trattamento
Descrizione dettagliata
There are different kinds of pacemakers and different ways they can be set up to try to make the heart beat regularly. A normal heart has four chambers; these four chambers pump in a co-ordinated way to move blood effectively. When pacemakers were first invented, they told the heart when to pump, but didn't make the four chambers work well together. Newer pacemakers can give more detailed instructions, so the chambers work together more effectively. We already know that the newer (bi-ventricular) pacemakers work better for some patients with heart failure.
There are blood tests (often referred to as "markers") that give us information about how well your heart is working and about how your body is responding to heart failure. The idea of this study is to compare different ways of setting up a pacemaker, using these blood tests to give us information about how well it's working. We hope to learn if we can use this approach to figure out the best pacemaker setup ("programming") for each individual patient.
Usually pacemakers have two wires or leads, one is in the top right chamber and the other in the bottom right chamber of the heart. The newer pacemakers, which are given to patients with heart failure, have an additional lead or wire, which goes to the left side of the heart. So when heart contracts the lead from top chamber sends impulses to bottom chambers and the leads in right and left sides of bottom chamber responds by sending impulses in a co-ordinated way enabling heart to contract efficiently.
Currently, the standard way of treating patients with heart failure is by pacing the top and then bottom chambers, based on a timing interval determined by ultrasound, while also pacing the two bottom chambers in a coordinated manner. There are differences of opinion among experts and by previous studies regarding this method. Pacing is accomplished through pacemaker wires, which are placed in the right top chamber, the right bottom chamber and the left bottom chamber of the heart.
The setting we propose to adjust is the timing between the impulse sent between top and bottom chambers.
Tipo di studio
Iscrizione (Effettivo)
Fase
- Prima fase 1
Contatti e Sedi
Luoghi di studio
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Minnesota
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Minneapolis, Minnesota, Stati Uniti, 55455
- University of Minnesota
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Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
Accetta volontari sani
Sessi ammissibili allo studio
Descrizione
Inclusion Criteria:
- Diagnosis of chronic heart failure
- patients on stable pharmacologic therapy for at least 3 months
- EF< 35%
- age >18 years
- NYHA functional class III or IV
- eligible for either CRT pacer or CRT defibrillator for heart failure
- Ischemic or non-ischemic cardiomyopathy
- patients that are able to tolerate VDD mode with a lower rate of 40bpm programming
Exclusion Criteria:
- systolic blood pressure <70mmHg
- Likely to receive a left ventricular assist device or cardiac transplant within 6 months of implant procedure
- patients who have previously received a CRT device
- documented atrial fibrillation
- complete heart block
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Trattamento
- Assegnazione: Randomizzato
- Modello interventistico: Assegnazione parallela
- Mascheramento: Separare
Armi e interventi
Gruppo di partecipanti / Arm |
Intervento / Trattamento |
|---|---|
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Comparatore attivo: 1
AVD set by taking the larger of 0.50ms or A-V interval 0.30
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Comparision of A-V delay settings
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Comparatore attivo: 2
AVD set by taking the larger of 0.50ms or A-V interval 0.50
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Comparision of A-V delay settings
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Comparatore attivo: 3
AVD set by taking the larger of 0.50ms or A-V interval 0.70
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Comparision of A-V delay settings
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Lasso di tempo |
|---|---|
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To assess the effect of CRT atrioventricular delay settings on biochemical markers in blood through 6 months
Lasso di tempo: end of the study
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end of the study
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Misure di risultato secondarie
Misura del risultato |
Lasso di tempo |
|---|---|
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assess effects of echocardiogram through 6months after CRT on heart failure
Lasso di tempo: end to study
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end to study
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assess the effects of minnesota Living with heart failure questionaire through 6 months after CRT on heart failure
Lasso di tempo: end of study
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end of study
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assess effects of six minute hall walk through 6 months after CRt on heart failure
Lasso di tempo: end of study
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end of study
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assess effects of SDANN through 6 months after CRT on heart failure
Lasso di tempo: end of study
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end of study
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Collaboratori e investigatori
Sponsor
Collaboratori
Investigatori
- Investigatore principale: David G Benditt, MD, University of Minnesota
Studiare le date dei record
Studia le date principali
Inizio studio
Completamento primario (Effettivo)
Completamento dello studio (Effettivo)
Date di iscrizione allo studio
Primo inviato
Primo inviato che soddisfa i criteri di controllo qualità
Primo Inserito (Stima)
Aggiornamenti dei record di studio
Ultimo aggiornamento pubblicato (Stima)
Ultimo aggiornamento inviato che soddisfa i criteri QC
Ultimo verificato
Maggiori informazioni
Termini relativi a questo studio
Parole chiave
Termini MeSH pertinenti aggiuntivi
Altri numeri di identificazione dello studio
- 0303M44604
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