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Phenotype‐Negative LQTS.Background: Data regarding possible ion channel mechanisms that predispose to ventricular tachyarrhythmias in patients with phenotype‐negative long‐QT syndrome (LQTS) are limited.
Methods and Results: We carried out cellular expression studies for the S349W mutation in the KCNQ1 channel, which was identified in 15 patients from the International LQTS Registry who experienced...
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