BOSTON--In the MRI environment under specific guidelines, a new pacemaker system facilitates access to this diagnostic imaging technique with no evidence of clinical (bradycardia or tachycardia), subclinical (pacemaker performance) or technical (pacemaker or lead damage) deficits in patients, according to a late-breaking clinical pivotal trial presented May 14 at the 2009 meeting of the Heart Rhythm Society (HRS).