Diagnostic criteria

  Heart rate > 100/minute.

  P wave is positive in D1 and D2.

  Every P wave is followed by a QRS complex.



Causes

  Hypoxia

  Hypovolemia

  Anemia

  Infection

  Fever

  Anxiety



Clinical significance

  Usually, there is an underlying cause of the sinus tachycardia.

      Treatment of the underlying cause is usually sufficient for the disappearance of the sinus tachycardia.

  Very rarely, there is no obvious cause for sinus tachycardia:
Inappropriate sinus tachycardia .

  If the patient complains of palpitation and the diagnosis is inappropriate sinus tachycardia,

      then heart rate can be decreased by the use of a beta blocker, diltiazem or verapamil.

      Such a therapy may also prevent the possible development of tachycardia-induced cardiomyopathy.





ECG 1. Sinus tachycardia.