Arrhythmias, Atrioventricular Block, Bradyarrhythmias, Cardiovascular Disease, Ventricular Dysfunction
Conditions
Keywords
Pacemaker, Pacemaker implantation, Coronary sinus, Ventricular dysfunction, Right ventricular pacing, Left ventricular pacing
Brief summary
Previous experimental and clinical studies have consistently suggested that right ventricular (RV) apical pacing has important adverse effects. Ventricular pacing, however, is required, and cannot be reduced in many patients with atrioventricular block. The SAFE-LVPACE study is a randomized controlled trial that compare the effects of conventional right ventricular (RV) pacing vs. left ventricular (LV) in patients with AV block.
Detailed description
Over the past several years, there has been growing concern over the significant deleterious effects of RV pacing, including electromechanical dyssynchrony, proarrhythmia and development of heart failure (HF). However, it remains unclear whether pacing-related ventricular dyssynchrony can translate into significant LV structural changes and produce important clinical impairment in an average pacemaker population with compromised AV conduction. Alternatively, left ventricular pacing has been shown to minimize ventricular dyssynchrony and to improve symptoms and prognosis in patients with mild to moderated systolic HF and prolonged QRS duration. This randomized controlled study is been conducted to compare the effects of conventional right ventricular (RV) pacing vs. left ventricular (LV) in patients with AV block. The hypothesis is that isolated LV pacing through the coronary sinus can be used safely and provide greater hemodynamic benefits to patients with AV block and normal ventricular function who require only the correction of heart rate. Specifically, the investigator aims are to evaluate the safety, efficacy and the effects of left ventricular pacing using active-fixation coronary sinus lead-the Attain StarFix® Model 4195 OTW Lead, compared to right ventricular pacing in patients with implantation criteria for conventional pacemaker stimulation.
Interventions
DEVICELeft ventricular pacing through coronary sinus tributaries (Attain StarFix)
Left ventricular pacing in patients with bradycardia
DEVICERight ventricular pacing (Medtronic)
Conventional right ventricular pacing in patients with bradycardia.
Sponsors
Duke University
University of Sao Paulo
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 90 Years
Healthy volunteers
No
Inclusion criteria
* Older than 18 years * Pacemaker initial implant by transvenous approach * Presence of AV block * Presence of atrial fibrillation / atrial flutter with slow ventricular response * Left ventricular systolic function \> 0.40 * Subject agreed to participate and signed the consent form
Exclusion criteria
* Absence of venous access * Impediment of venous access due to presence of intracardiac defects * Impediment of venous access due to presence of tricuspid valve prosthesis * Need for radiotherapy in the chest * Presence of chest deformity * Pregnancy * Life expectancy of less than one year * Contraindication to administration of iodinated contrast (creatinine \> 3.0) Unable to attend the follow-up appointments
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Surgical success | Participants will be evaluated during the perioperative period and during the hospital stay, an expected average of 2 days | Surgical success: absence of complications |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Echocardiographic and Clinical composite | Participants will be evaluated at 6 and 24 months after PM implantation | Echocardiographic: ventricular dysfunction Clinical composite: all mortality, cardiovascular mortality, hospitalization, heart failure |
Other
| Measure | Time frame | Description |
|---|---|---|
| Quality of Life | Participants will be evaluated at 6 and 24 months after PM implantation | Quality of life: improvement on quality of life scores measured by three questionnaires: 36-Item Short Form Health Survey (SF-36), a disease specific questionnaire for pacemaker patients (Aquarel) and Minnesota Living With Heart Failure (MLWHF). |
Countries
Brazil
Contacts
Primary ContactRoberto Costa, MD PhD
Backup ContactKatia R Silva, RN PhD
Outcome results
None listed