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Journal Article
Research Support, Non-U.S. Gov't
Genetic and Phenotypic Characterization of Community Hospital Patients With QT Prolongation.
Journal of the American Heart Association 2018 August 22
Background Congenital long- QT syndrome ( LQTS ) is a genetic disorder characterized by prolongation of the corrected QT interval ( QT c) on an ECG . The aim of the present study was to estimate the prevalence of pathogenic and likely pathogenic sequence variants in patients who had at least 1 ECG with a QT c ≥500 ms. Methods and Results Telemark Hospital Trust is a community hospital within the Norwegian national health system, serving ≈173 000 inhabitants. We searched the ECG database at Telemark Hospital Trust, Norway, from January 2004 to December 2014, and identified 1531 patients with at least 1 ECG with a QT c ≥500 ms. At the time of inclusion in this study (2015), 766 patients were alive. A total of 733 patients were invited to participate, and 475 accepted. The 17 genes that have been reported to cause monogenic LQTS were sequenced among the patients. Pro- QT c score was calculated for each patient. A molecular genetic cause of LQTS was detected in 31 (6.5%) of 475 patients. These patients had a lower pro- QT c score than those without pathogenic or likely pathogenic variants (1.7±1.0 versus 2.8±1.6; P<0.001). Conclusions Compared with the general population, hospitalized patients with a QT c ≥500 ms in at least 1 ECG recording had an increased likelihood for pathogenic and likely pathogenic variants in LQTS genes. We recommend increased awareness of the possibility of LQTS in patients with at least 1 ECG with a QT c ≥500 ms.
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