Inappropriate sinus tachycardia (IST) is a chronic syndrome characterized by an elevated heart rate (HR) at daytime activity or during minimal exertion. During the night hours an evident drop of… Click to show full abstract
Inappropriate sinus tachycardia (IST) is a chronic syndrome characterized by an elevated heart rate (HR) at daytime activity or during minimal exertion. During the night hours an evident drop of HR is observed. The mechanism of this phenomenon is not well understood. Ivabradine therapy is a
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