The Use of CT to Identify Damaged Heart Muscle in Patients Undergoing Ventricular Tachycardia Ablation.
Patients with ventricular tachycardia (VT) undergo catheter ablation. During the ablation procedure, the heart is mapped to determine areas of heart muscle damage. The heart scarring areas are often the source of the VT. Delayed enhancement CT has recently been used to determine areas of scarring . This study is to determine if the areas of damaged heart muscle mapped with the delayed enhancement CT correlate with the same areas that are determined during the catheter ablation.
|Study Design:||Observational Model: Case-Only
Time Perspective: Prospective
|Official Title:||Utility of Delayed-Enhancement Multi-Detector Computed Tomography Imaging in Identifying Arrhymogenic Substrate in Patients Undergoing Catheter Ablation for Ventricular Tachycardia|
- Areas of hyperenhanced myocardium, as determined by delayed enhancement CT, correlate with the findings on voltage mapping of the LV in patients with a prior myocardial infarction who are undergoing VT ablation. [ Time Frame: 1 week ] [ Designated as safety issue: No ]
|Study Start Date:||November 2006|
|Study Completion Date:||March 2008|
Catheter ablation of ventricular tachycardia (VT) is performed in patients who have recurrent VT despite the use of other therapies. Electroanatomic mapping of the left ventricular myocardium is performed as part of these procedures to define the arrhythmogenic substrate for subsequent ablation. We hypothesize that delayed enhancement multi-detector computed tomography (MDCT) will identify areas of myocardial scarring or fibrosis that correlate with findings of voltage mapping in patients with a prior myocardial infarction who are undergoing VT ablation. We will perform a pilot study involving 10 patients with coronary artery disease scheduled for VT ablation to determine the ability of delayed enhancement MDCT to identify arrhythmogenic substrates in these patients, when compared with electroanatomic mapping. All patients will undergo a standard of care 64-slice MDCT study, followed 5 minutes later by the research delayed enhancement acquisition. We will evaluate the relationship between hyperenhanced myocardium, as detected by delayed enhancement MDCT, and abnormal myocardium detected on voltage mapping, defined as areas of myocardium with < 0.5 mV signal amplitude. Studies will be performed on the new Siemens 64-slice dual source CT scanner, which reduces radiation exposure from the scan by 33-50%. This study will generate preliminary data which will be used for subsequent NIH/AHA grant applications or industry sponsored trials.