Related Experiment Video
Updated: Aug 12, 2025
A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Implantable Defibrillator System Shock Function, Mortality, and Cause of Death After Magnetic Resonance Imaging
Joshua Ra1, Matt T Oberdier2, Masahito Suzuki2
1Department of Medicine, University of California San Francisco, San Francisco, California (J.R.).
Background:
Studies have shown that magnetic resonance imaging (MRI) does not have clinically important effects on the device parameters of non-MRI-conditional implantable cardioverter-defibrillators (ICDs). However, data on non-MRI-conditional ICD detection and treatment of arrhythmias after MRI are limited.
Objective:
To examine if non-MRI-conditional ICDs have preserved shock function of arrhythmias after MRI.
Design:
Prospective cohort study. (ClinicalTrials.gov: NCT01130896).
Setting:
1 center in the United States.
Patients:
629 patients with non-MRI-conditional ICDs enrolled consecutively between February 2003 and January 2015.
Interventions:
813 total MRI examinations at a magnetic field strength of 1.5 Tesla using a prespecified safety protocol.
Measurements:
Implantable cardioverter-defibrillator interrogations were collected after MRI. Clinical outcomes included arrhythmia detection and treatment, generator or lead exchanges, adverse events, and death.
Results:
During a median follow-up of 2.2 years from MRI to latest available ICD interrogation before generator or lead exchange in 536 patients, 4177 arrhythmia episodes were detected, and 97 patients received ICD shocks. Sixty-one patients (10% of total) had 130 spontaneous ventricular tachycardia or fibrillation events terminated by ICD shocks. A total of 210 patients (33% of total) are known to have died (median, 1.7 years from MRI to death); 3 had cardiac arrhythmia deaths where shocks were indicated without direct evidence of device dysfunction.
Limitations:
Data were acquired at a single center and may not be generalizable to other clinical settings and MRI facilities. Implantable cardioverter-defibrillator interrogations were not available for a subset of patients; adjudication of cause of death relied solely on death certificate data in a subset.
Conclusion:
Non-MRI-conditional ICDs appropriately treated detected tachyarrhythmias after MRI. No serious adverse effects on device function were reported after MRI.
Primary Funding Source:
Johns Hopkins University and National Institutes of Health.
More Related Videos
Related Concept Videos
01:24Magnetic Resonance Imaging
01:21Imaging Studies for Cardiovascular System IV: CMRI
01:23Cardiopulmonary Resuscitation III: AED Use