InSync III Marquis Model 7279 Cardioverter Defibrillator Cardiac Resynchronization System

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.

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Key information

Conditions

Heart Failure Cardiovascular Diseases Heart Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Anchorage, Alaska, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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)

Treatment and study plan

cardiac resynchronization therapy

Device

Primary outcomes

To evaluate the safety and effectiveness of the InSync III Marquis Model 7279 in heart failure patients who were indicated for an ICD

Secondary outcomes

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

Sponsors and collaborators

Lead sponsor

Medtronic Cardiac Rhythm and Heart Failure

Industry

Registry information

Important dates

Study start: 2003
Study completion: 2005
First posted: Dec 30, 2005
Registry last updated: Dec 21, 2007

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed