ECG findings in re-entrant tachycardias
The rhythm is regular and the rate is between 130 and 250 beats per minute.
The QRS complex is narrow unless:
- there is rate-related bundle branch block
- there is pre-existing bundle branch block
- anterograde conduction occurs down an accessory pathway which is distinct from the AV node
P waves:
- are inverted
- in AV-nodal re-entry tachycardia may be masked by the QRS complex
- in AV re-entry tachycardia occur half-way between the QRS complexes
- there is one P wave for each QRS complex
Reference
- Kotadia ID, Williams SE, O'Neill M; Supraventricular tachycardia: An overview of diagnosis and management. Clin Med (Lond). 2020 Jan;20(1):43-47.
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