Chronic Defibrillation Thresholds in Nonthoracotomy Implantable Defibrillator
نویسندگان
چکیده
Background To establish the chronic stability of defibrillation thresholds (DFTs) in a transvenous cardioverter/defibrillator (TCD) system, we studied 37 consecutive patients with TCD systems implanted for >6 months. Methods and Results DFT was measured by a step-down method at implant and 2 and 6 months later. The mean ejection fraction was 34.5±14.3%. Coronary artery disease with previous myocardial infarction was present in 31 patients. The mean DFT rose from 13.3 ±4.3 J at implant to 16.5 ±4.7 J at 2 months (P<.001) and 17.6±5.4 J at 6 months (P<.0001). ANOVA revealed a statistically significant rise in DFT over time (P<.0005). At 2 months, 25 patients had a rise in DFT, and 14 had a rise 25 J. The observed rise at 2 months persisted
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