Ignite Creation Date:
2024-05-05 @ 10:17 AM
Last Modification Date:
2024-10-26 @ 9:02 AM
Study NCT ID:
NCT00001895
Status:
COMPLETED
Last Update Posted:
2008-03-04
First Post:
1999-11-03
Brief Title:
Electromechanical Mapping to Evaluate Heart Muscle
Sponsor:
National Heart Lung and Blood Institute NHLBI
Organization:
National Institutes of Health Clinical Center CC
Study Overview
Official Title:
Evaluation of Electromechanical Endocardial Mapping for Assessment of Myocardial Ischemia and Viability
Status:
COMPLETED
Status Verified Date:
2001-12
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Patients with narrowed heart arteries who undergo coronary angiography imaging of the hearts blood vessels may participate in this heart mapping study designed to gain information about the condition of different areas of the heart muscle
In coronary angiography a thin tube called a catheter is inserted through a small incision in the groin and pushed up to the heart There a contrast dye is injected revealing areas of blockage in the coronary arteries-the vessels that supply blood to the heart muscle As soon as the angiography is completed patients in this study will undergo another procedure called Biosense mapping For this procedure a special catheter with a tiny sensor at the tip will be inserted into the sheath that was used for the angiography and advanced to the hearts main pumping chamber-the left ventricle The sensor detects the pattern of an electromagnetic field generated from a pad under the patient and an image of the precise location of the catheter in 3-dimensional space can be seen on a computer screen The catheter is then navigated to various precise locations in the ventricle producing an electromechanical map that distinguishes scarred muscle tissue from healthy tissue-information that can be important in guiding treatment
When this mapping is completed the patient will be given a drug called dobutamine to increase the heartbeat and the mapping will be repeated The heart may also be mapped while the heart rate is increased with a pacing catheter to simulate exercise The test will be stopped if adverse side effects develop
Patients in the study will also have magnetic resonance imaging MRI and PET positron emission tomography scans to get additional information about the heart muscle such as blood flow and metabolism rate
In coronary angiography a thin tube called a catheter is inserted through a small incision in the groin and pushed up to the heart There a contrast dye is injected revealing areas of blockage in the coronary arteries-the vessels that supply blood to the heart muscle As soon as the angiography is completed patients in this study will undergo another procedure called Biosense mapping For this procedure a special catheter with a tiny sensor at the tip will be inserted into the sheath that was used for the angiography and advanced to the hearts main pumping chamber-the left ventricle The sensor detects the pattern of an electromagnetic field generated from a pad under the patient and an image of the precise location of the catheter in 3-dimensional space can be seen on a computer screen The catheter is then navigated to various precise locations in the ventricle producing an electromechanical map that distinguishes scarred muscle tissue from healthy tissue-information that can be important in guiding treatment
When this mapping is completed the patient will be given a drug called dobutamine to increase the heartbeat and the mapping will be repeated The heart may also be mapped while the heart rate is increased with a pacing catheter to simulate exercise The test will be stopped if adverse side effects develop
Patients in the study will also have magnetic resonance imaging MRI and PET positron emission tomography scans to get additional information about the heart muscle such as blood flow and metabolism rate
Detailed Description:
A novel left ventricular LV mapping system Biosense Inc uses low-intensity magnetic field energy to determine the location of sensor-tipped catheter electrodes within the LV On the basis of previous experimental and human studies correlating the extent of myocardial ischemia with the amplitude of electrical signals we hypothesize that such an integrated LV electromechanical mapping system could be used to distinguish healthy from ischemic or immobile myocardium on the basis of the extent of electromechanical endocardial signals If this hypothesis is confirmed the ability to detect on-line myocardial viability and ischemia in the catheterization laboratory may be feasible
The present study attempts to distinguish between ischemic immobile and normal myocardium by comparing LV electromechanical mapping data at rest and during pharmacologic stimulation with imaging studies using MRI PET thallium and echo in patients with coronary artery disease
The present study attempts to distinguish between ischemic immobile and normal myocardium by comparing LV electromechanical mapping data at rest and during pharmacologic stimulation with imaging studies using MRI PET thallium and echo in patients with coronary artery disease
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None
Secondary IDs
| Secondary ID | Type | Domain | Link |
|---|---|---|---|
| 99-H-0153 | None | None | None |