Atrioventricular node reentrant tachycardia (AVNRT) is an arrhythmia that is regular, fast (180-250 bpm) and originating from the AV node. The P wave is often hidden within the QRS complex. There may be a little second R wave (R’) but the QRS can still be narrow. AVNRT can be treated with valsalva, carotid sinus massage, adenosine, verapamil, diltiazem or electrical cardioversion. The two main forms of AVNRT are slow-fast (common, 90%) and fast-slow (uncommon, 6%). In slow-fast AVNRT, the impulse first travels to the ventricles via the slow pathway and returns to the atria via the fast pathway. There can be a retrograde P at the end of the QRS. In fast-slow AVNRT, the opposite occurs and the P can be far behind the QRS. It is also possible to have slow-slow AVNRT (4%).
See also: Junctional Rhythms
Can you add to the information on this page?
This ECG Archive is an academic, non-commercial #FOAMed project aiming to crowdsource a free open access database of ECGs and signs. If you include your personal details such as your name you will be attributed for your contribution, unless you tell us that you don't want this to happen. Personal contact details such as email addresses will not be published but may be used to email you in reply. Full project details and participant information available here.