Clinically Indicated Magnetic Resonance Imaging in Patients With Cardiac Devices

Completed

Brief Summary: Patients with implanted cardiac devices who meet appropriate entrance criteria undergo clinically indicated Magnetic Resonance (MR) Imaging Studies using an established safety protocol.

Detailed Description: This prospective cohort study to use an established MRI device safety protocol to decrease the risk of clinically indicated MR imaging in patients with implantable cardiac devices. All devices will undergo a complete interrogation and testing of thresholds, sensing, battery voltage and impedances prior to and following imaging. Pre-MRI, devices will be programmed to setting that will ensure MRI safety. During imaging, patients will blood pressure, heart rate and O2 sat level will be monitored continuously.

Recruitment & Eligibility

Inclusion Criteria

Patients with an emergent or absolute need for MR imaging and PPM or certain ICD's

Exclusion Criteria

Primary Outcome Measures

Name	Time	Method
Device Malfunction	immediately post MRI (up to 2 hours) and long-term follow-up (up to 6 months)	Number of patients with change in device testing defined as a change in any of the following (impedance, battery life, p and r wave sensing and atrial and ventricular capture thresholds) not to exceed 50 percent from baseline
Patient Safety	assessed during MRI and immediate post MRI (up to 2 hours)	Number of patients with change in vital signs including blood pressure, heart rate and pulse oximetry not to exceed 10 percent from baseline lead impedances as well as patient reports of any discomfort related to MRI)

Secondary Outcome Measures

Name	Time	Method
Noise Artifacts as Assessed by the Number of Participants With a Greater Than a 50% Change in Lead Impedance	Immediately post MRI (up to 2 hours)	We will evaluate whether or not the artifacts produced are significant enough to prevent diagnostic interpretation of images