Diagnostic criteria

  Heart rate (ventricular rate) is 140-250/minute.

  QRS complexes are
narrow (<120ms) and are similar to those of the sinus rhythm.

  This is the
most common type of paroxsymal supraventricular tachycardias.

  Although not a criteria in the differential diagnosis, the ventricular rate in supraventricular tachycardias is

      generally higher than the ventricular rate of the ventricular tachycardias.



Clinical importance

  In patients with narrow QRS complex, paroxysmal, re-entrant supraventricular tachycardias,

      the appearance of ST segment depression or T wave negativity
during the tachycardia does not signify

      the presence of coronary artery disease.

  In patients with narrow QRS complex, paroxysmal, re-entrant supraventricular tachycardias,

      the appearance of new T wave negativity
after tachycardia has ended , does not signify

      the presence of coronary artery disease.





ECG 1. AVNRT. Tachycardia with narrow QRS complexes.

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ECG 2.AVNRT in another patient.

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ECG 3a. Widespread ST segment depression is observed in a middle-aged woman with AVNRT.

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ECG 3b. In the same patient, ST segment depression disappeared immediately after the tachycardia has ended.

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ECG 4. A 5 years old child with dilated cardiomyopathy and long RP AVNRT. P waves preceeding the QRS complexes are

negative in leads II, III and aVF (positive in lead aVR)
and are formed by the retrograde activation of the atrium. This patient
later underwent successful radiofrequency ablation. The calibration of ECG is 5 mm/mV.

Prof. Dr. Bulent Oran has donated this ECG to our website.

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ECG 5a. Supraventricular tachycardia (SVT) attack in a 1 day-old newborn.

Pediatric Cardiologist Dr. Mahmut Gokdemir has donated the above ECG to our website.

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ECG 5b. The ECG above belongs to the same baby and shows SVT attack under Amiodarone therapy.
It was recorded when he was 5 days-old.

Pediatric Cardiologist Dr. Mahmut Gokdemir has donated the above ECG to our website.

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