MRI Assessment of Arrythmia Ablation Lesions

Children's National Heart Institute (CNHI) with major contractual support from the National
Institutes of Health / National Heart, Lung and Blood Institute has installed a combined
X-ray / Magnetic Resonance Imaging cardiac catheterization lab suite allowing for experts in
the fields of cardiac MRI, interventional cardiac MRI and clinical pediatric interventional
electrophysiology to work together to make substantial advancements in the development of
novel techniques and applications to reach the goal of improved survival and care for the
congenital heart disease population. The CNHI X-ray/MRI suite will allow for streamlined
transfer of patients from fluoroscopy directly to the MRI scanner under the same sedation
thereby allowing for immediate post procedure imaging and minimizing risk to the patient.

Inclusion Criteria:

- Written informed consent from any patient willing to participate who is undergoing an
electrophysiology study with potential for arrhythmia ablation

- Written informed assent, if applicable

Exclusion Criteria:

- Women who are pregnant

- Women who are nursing and who do not plan to discard breast milk for 24 hours

- Patients with a contraindication to MRI scanning will be excluded. These
contraindications include patients with the following devices:

- Central nervous system aneurysm clips

- Implanted neural stimulator

- Implanted cardiac pacemaker or defibrillator which are not MR safe or MR
conditional according to the manufacturer

- Cochlear implant

- Ocular foreign body (e.g. metal shavings)

- Implanted Insulin pump

- Metal shrapnel or bullet.

- Any intracardiac or intravascular device that is not MR safe or MR conditional
according to the manufacturer based on both material and timing of device
placement