Heart Failure
Conditions
Keywords
Heart Failure, Cardiac Resynchronization
Brief summary
People who have a dangerously fast heart beat, or whose heart is at risk of stopping beating, may be in need of an electronic device called an implantable cardioverter defibrillator (ICD). An ICD is implanted surgically just under the skin in the upper chest area and it sends a strong electrical impulse, or shock, to the heart to return it to a normal rhythm. If the heart is beating too slowly or at an abnormal rhythm, an ICD can also pace the heart to return the heart to its normal rhythm. The InSync III Marquis device can change the timing of when the left and right ventricles of the heart are paced to beat. This is called V to V timing. V to V timing may further improve the pumping function of the heart. The purpose of this study is to determine whether or not this V to V timing feature of the InSync III Marquis system is safe and effective.
Interventions
DEVICECardiac resynchronization therapy
Sponsors
Medtronic Cardiac Rhythm and Heart Failure
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
Subject has, or is at risk of having, a heart beat that is too fast and his/her doctor has determined the need for an implantable cardioverter defibrillator. Subject is on optimal medical treatment for heart failure. Subject has reduced left ventricular ejection fraction (LVEF≤35%). (LVEF is a measurement of how well the left ventricle pumps blood out to the rest of the body. The higher the LVEF the more blood the ventricle is pumping.) Subject who has heart failure which severely limits daily activities (NYHA Class III) or subject who has severe heart failure and should always be resting (NYHA Class IV) Subject who has a QRS≥130ms (The QRS interval is a measurement of how the electrical signal involved in a heart beat travels/conducts through the ventricles. A wide QRS (more than 120 ms) suggests that there is a conduction problem (or block) in the ventricles.) Subjects with a left ventricular end diastolic dimension (LVEDD≥55mm). (The LVEDD is a measurement taken during an echocardiogram that is one indication of the health of the left ventricle.)
Exclusion criteria
Subject has unstable chest pain, heart surgery within past 3 months Subject has liver function tests greater than 3 times normal limits Subject has chronic (permanent) atrial arrhythmias (fast heart beats in the upper chamber(s) of the heart)
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| To evaluate the safety and effectiveness of the InSync III Marquis Model 7279 in heart failure patients who were indicated for an ICD | — |
Secondary
| Measure | Time frame |
|---|---|
| Rate of oxygen uptake (consumption) measured during exercise, all adverse events, echocardiographic assessments (tests done using ultra sound to examine the health of the heart), and device performance | — |
Countries
United States
Outcome results
None listed