In patients with symptoms such as irregular heartbeats, dizziness, or fainting, or in individuals that physicians suspect may ...

Background Inappropriate sinus tachycardia (IST) is characterized by persistent and disproportional elevation of heart rate (HR). Ivabradine has been successfully used in some patients.

Twelve-lead ECG tracing during stress test shows the typical aspect of bidirectional ventricular ... be prescribed and Holter recordings and exercise tests should be repeated periodically to ensure ...

Several ECG markers and phenotypes have been associated ... Several markers of atrial or atrioventricular nodal abnormalities such a intervals of P wave, PR, terminal velocity, P morphology ...

Physical examination reveals no abnormalities. S 1 and S 2 are normal; no other heart sounds are heard. There are no murmurs, rubs, or gallops. Laboratory study results, including complete blood count ...