Shock Testing Unnecessary During ICD Implantation
the MPR take:
Although routine defibrillation testing (DT) during defibrillator implantation is a common practice, results from a study presented at the Heart Rhythm Society meeting in San Francisco show that this testing may not be needed after all. As part of the SIMPLE (Shockless Implant Evaluation) trial, researchers at McMaster University randomized 2,500 patients in 18 countries who were undergoing ICD implantation to receive routine DT or no DT. No significant differences were seen in the death rates due to arrhythmia between the two groups and no difference in total mortality was evident. The authors recommend that routine DT is not necessary for most ICD implantations.
When cardiologists implant defibrillators in patients at high risk of dying from a heart rhythm disorder they nearly always perform a defibrillation test in which they induce a lethal arrhythmia, ventricular fibrillation, to make sure the device accurately detects the arrhythmia and terminates ...
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