Abstract | OBJECTIVES: BACKGROUND: METHODS: Patients attending the HCM clinic in Sydney, Australia, and who had undergone ICD insertion were included. Baseline data on clinical and ICD characteristics were collected. The primary endpoint was the proportion of patients who experienced at least 1 appropriate therapy from the ICD. RESULTS: Of 164 HCM patients included (62% male; mean follow-up, 6 ± 4 years [range, 0 to 19 years]), 21 patients (13%) had at least 1 appropriate therapy. Corrected QT (QTc) interval was the strongest clinical predictor of appropriate ICD therapy (458 ± 30 ms vs. 430 ± 35 ms; p = 0.001). Multivariate logistic regression analysis demonstrated a 1.2-fold increased likelihood of appropriate therapy per 10-ms increase in QTc, independent of left ventricular wall thickness (LVWT) (odds ratio: 1.2; 95% confidence interval [CI]: 1.03 to 1.39; p = 0.02) and sex (odds ratio: 1.2; 95% CI: 1.07 to 1.42; p = 0.003). On analysis of cumulative event-free survival from appropriate ICD therapy, the risk for an appropriate ICD therapy in the subgroup with prolonged QT was >3-fold that in the subgroup without prolonged QT, after adjustment for LVWT (hazard ratio: 3.2; 95% CI: 1.02 to 9.88; p = 0.047) and sex (hazard ratio, 3.7; 95% CI, 1.22 to 11.41; p = 0.02). CONCLUSIONS: The findings from this study suggest that QTc interval prolongation is a novel clinical predictor of appropriate ICD therapy in HCM.
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Authors | Belinda Gray, Jodie Ingles, Caroline Medi, Christopher Semsarian |
Journal | JACC. Heart failure
(JACC Heart Fail)
Vol. 1
Issue 2
Pg. 149-55
(Apr 2013)
ISSN: 2213-1787 [Electronic] United States |
PMID | 24621839
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2013 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved. |
Topics |
- Adult
- Cardiomyopathy, Hypertrophic
(physiopathology, therapy)
- Defibrillators, Implantable
- Electrocardiography
- Female
- Humans
- Male
- Predictive Value of Tests
- Time Factors
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