This study will validate the recording accuracy of a specific electrical interval of the heart, the QT interval, between an iPhone rhythm strip recording and a traditional 12-lead electrocardiogram (ECG). These measurements will occur in hospitalized patients that are starting either sotalol or dofetilide, since both of these medications can prolong the QT interval.
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QT interval measurement (in milliseconds)
Timeframe: Participants will be followed for duration of hospital stay during which dofetilide or sotalol are being started, an expected average of 3 days