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This study is looking at cardiac rhythm management (CRM) and fusion beats in patients who have a pacemaker or implantable cardioverter-defibrillator (ICD), to determine if there is a correlation between the time between the contraction of the upper chambers of the heart (atrium) and the lower chambers of the heart, (ventricle) and heart function.
Some studies of people with pacemakers have been done to determine if shortening the time of contraction between the atrium and ventricle could benefit the function of the left ventricle. These studies have shown that there is no benefit in heart function.There have been other studies which have shown that chronic pacing of the right ventricle, especially with the lead placed at the tip of the right ventricle, can lead to a decrease in the function of the left ventricle and congestive heart failure. In some patients long term pacing of the right ventricle has also been associated with a reduction in the ability of the left ventricle to pump blood. This is know as a reduced left ventricular ejection fraction, which can be documented by an echocardiogram.
This study proposes to evaluate the acute effects of progressive paced fusion beats on the left ventricle to answer the question whether there is an delay between the atrium and ventricle that is "too long" or "too short".
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Observation | 30 Patients with dualchamber pacemakers or implantable cardioverter-defibrillators (ICDs) |
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| Measure | Description | Time Frame |
|---|---|---|
| Acute effect of mechanical dyssynchrony measured by septal to lateral wall delay using tissue doppler imaging between baseline non-fused atrioventricular conduction and varying degrees of paced and native atrioventricular conduction. |
| Measure | Description | Time Frame |
|---|---|---|
| Stroke volume as measured by time velocity integral across the aorta valve between baseline non-fused atrioventricular conduction, and varying degrees of paced and native atrioventricular conduction. |
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Inclusion Criteria:
Exclusion Criteria:
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Pacemaker clinic or inpatient EP at St. Marys' Medical Center Duluth MN
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| Name | Affiliation | Role |
|---|---|---|
| Michael E Mollerus, MD | Essentia Health | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Essentia Health | Duluth | Minnesota | 55805 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 7694250 | Background | Auricchio A, Sommariva L, Salo RW, Scafuri A, Chiariello L. Improvement of cardiac function in patients with severe congestive heart failure and coronary artery disease by dual chamber pacing with shortened AV delay. Pacing Clin Electrophysiol. 1993 Oct;16(10):2034-43. doi: 10.1111/j.1540-8159.1993.tb00997.x. | |
| 7560625 | Background |
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| ID | Term |
|---|---|
| D009202 | Cardiomyopathies |
| ID | Term |
|---|---|
| D006331 | Heart Diseases |
| D002318 | Cardiovascular Diseases |
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