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American Heart Association Rapid Access Journal Report: Implanted Monitor Accurately Detects Heart Rhythm Disturbances
Date:2/17/2010

onitor, which is the size of a camera's memory stick, was inserted just under a patient's skin using local anesthesia.  A Holter monitor is commonly used to detect AF.  It has wires attached to the chest and is worn on the waist much like a music player.

The study enrolled patients from 24 medical centers, mainly in Europe and Canada.  Patients had an average age of 57, and 67 percent were men.  About 10 percent had a history of stroke or transient ischemic attack.

The researchers found that the new computation method with the Reveal monitor was highly sensitive, correctly detecting AF in 96.1 percent of all patients with AF.  

"Even with repetitive, seven-day Holter monitoring, atrial fibrillation may not be detected in a significant number of patients," said Hindricks.  He expects the new device to be used as a way to assess treatment of patients.  "Only continuous long-term rhythm monitoring will be able to precisely define the rhythm outcome or efficacy of such treatment," he said.

Hindricks added that further studies are needed to determine the longer-term accuracy of the Reveal monitor.  "The device has a limited data storage capacity (49.5 minutes of data), and this may be a limitation during longer follow-up periods -- especially since the presence of false positive episodes may exceed the storage capacity in some patients.  Thus, long-term performance and validation studies are needed to find the optimal way of handling the device."  

Medtronic funded the study.

Co-authors are: Evgueny Pokushalov, M.D.; Lubos Urban, M.D.; Milos Taborsky, M.D., Ph.D.; Karl-Heinz Kuck, M.D., Ph.D.; Dmitry Lebedev, M.D., Ph.D.; Guido Rieger<
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SOURCE American Heart Association
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