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Study shows how to reduce inappropriate shocks from implanted defibrillators
Date:11/7/2012

d in the new paper, found that ICDs are inappropriately activated in between 8 percent and 40 percent of patients.

Under conventional programming, an ICD may be activated if the heart beats 170 to 199 beats per minute for 2.5 seconds or at least 200 beats per minute for 1 second. If the heart rate does not slow within 5 to 10 seconds, a shock may be delivered.

The study included 1,500 patients, who were randomly assigned to three groups. The first group had ICDs with conventional programming. In the second group, the ICDs would not activate unless the heart beat at least 200 beats per minute. In the third group, the ICDs were programmed to have longer delays before activation (for example, 60 seconds delay when the heart beats 170 to 199 beats per minute).

After an average follow-up of 1.4 years, patients in the second group had a 79 percent reduction in first-time inappropriate ICD activation. Patients in the third group had a 76 percent reduction in first-time inappropriate activation.

There was a 55 percent reduction in deaths in the second group and a 44 percent reduction in deaths in the third group.
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Contact: Jim Ritter
jritter@lumc.edu
708-216-2445
Loyola University Health System
Source:Eurekalert

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