Heart Failure
Conditions
Keywords
Heart Failure, Cardiac resynchronization, echocardiography
Brief summary
Cardiac resynchronization therapy shows great promise as a method to improve ventricular function in heart failure due to dilated cardiomyopathy. It is applied to patients with class III and IV symptomatic heart failure on optimal therapy. Typical entry criteria in the trials testing resynchronization have used the electrocardiogram and a prolonged electrocardiogram (ECG) QRS interval as criteria for dyssynchrony. This is recognized to be quite limited as a tool for identifying patients. Several new echocardiographic methods for identifying dyssynchrony have been proposed. The purpose of this study is to systematically examine these multiple echocardiographic measurement techniques in three conditions: 1. in the patient's native rhythm simulated by changing the pacing system to atrial pacing only; 2. in conventional dual chamber pacing (DDD mode); and 3. during biventricular pacing. All patients entered into this study will already have had a biventricular pacemaker placed.
Interventions
PROCEDURECardiac resynchronization pacing
various pacemaker modes used over 1 hour
Sponsors
University of Wisconsin, Madison
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Healthy volunteers
No
Inclusion criteria
* All patients who have previously had a resynchronization pacemaker system placed at the University of Wisconsin Hospital or at the Middleton Veterans Hospital are potentially eligible for this study. * The study is only open to patients as enumerated above, and also patients who have good imaging windows.
Countries
United States
Outcome results
None listed