Unexpected asystole during 3T magnetic resonance imaging of a pacemaker-dependent patient with a 'modern' pacemaker

Pacemaker patients might safely undergo magnetic resonance imaging (MRI) if several prudent suggestions are followed by the supervising physician. Controversy exists regarding the safety of scanning all device patients, but especially pacemaker-dependent patients. Despite following suggestions previously proposed, physicians should be prepared for unexpected potentially life-threatening events during the conduct of MRI.