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Medtronic has released the first results from its large scale registry of nearly 3000 patients with implantable heart devices. Revealed at Heart Rhythm 2009, the OMNI study found that one out of six patients with ICDs or cardiac resynchronization therapy defibrillators (CRT-D) to prevent cardiac arrest received potentially life-saving therapy within two years of device implantation. This therapy came in the form of either antitachycardia pacing or a shock for dangerously fast heart rhythm. The purpose of the study, which began in 2005, is to observe how ICDs and CRT-Ds are used to treat and monitor arrhythmias. The company anticipates that OMNI will be completed by 2012, but Medtronic will be releasing results during the period up to the study’s end.