Effects Rapid Atrial Pacing Has on the Electrocardiogram (ECG) in Patients With Dual Chamber Pacemakers
The purpose of this study is to learn what effect rapid atrial pacing (in patients with dual chamber pacemakers) will have on the electrocardiogram including the QT Interval. The investigators are also interested in the differences caused by genes.
Prolonged QT Interval
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Modulation of QT Interval by Rapid Atrial Pacing in Patients With Dual Chamber Pacemakers|
- Determine the effect of abrupt changes in atrial rate on QT intervals [ Time Frame: 7 days ] [ Designated as safety issue: No ]
|Study Start Date:||April 2009|
|Study Completion Date:||June 2012|
|Primary Completion Date:||June 2012 (Final data collection date for primary outcome measure)|
This study requires a total of two study days as well as two follow up visits. During study day one, baseline blood will be drawn, a baseline electrocardiogram will be performed, and continuous QT Interval monitoring will be performed. The pacemaker rate will be increased to 90bpm at different time intervals and additional blood will be drawn to measure the effects of these rates changes.
On study day two, baseline blood will be drawn, a urine specimen will be obtained, an electrocardiogram will be performed, and continuous QT Interval monitoring will be performed. Following the acquisition of this information, the pacemaker rate will be decreased to 80bpm. We will obtain blood specimens, a urine specimen and an electrocardiogram at 30 minutes post rate change and again at 60 minutes post rate change.
Two days following the rate decrease to 80bpm, the patient will return to clinic to have their rate decreased to 70bpm. In two more days, the patient will return for a final rate change to 60bpm.
|United States, Tennessee|
|Vanderbilt University Medical Center|
|Nashville, Tennessee, United States, 37232-8802|
|Principal Investigator:||Dawood Darbar, M.D., Ph.D., F.A.C.C.||Vanderbilt University|