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Back to Cardiovascular Diseases

Sinus tachycardia

Causes

Sinus tachycardia occurs when the sinus mechanism is accelerated and the pattern of atrial and ventricular activation is normal.

ECG reading

The ECG is characterized by an atrial rate typically between 100 and 160 bpm, P waves with a normal con?figuration and axis, PR interval normal or slightly shortened, and a normal (baseline) QRS pattern. Occasionally, aberrant conduction within a bundle branch or fascicle may occur secondary to the increased rate. Therapy should be targeted at the underlying pathophysiologic process.

Treatment

Beta-adrenergic antagonists may be used to slow the sinus te, particularly in the setting of myocardial ischemia.

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