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AVNRT: Difference between revisions
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{{Arrhythmias| | {{Arrhythmias| | ||
| name = AV Nodal Re-entry Tachycardia (AVNRT) | | name = AV Nodal Re-entry Tachycardia (AVNRT) | ||
| | | locatieafbeelding = | ||
| atrial_frequency = 180-250 bpm | | atrial_frequency = 180-250 bpm | ||
| ventricular_frequency = 180-250 bpm | | ventricular_frequency = 180-250 bpm | ||
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| adenosine = terminates the arrhythmia(!) | | adenosine = terminates the arrhythmia(!) | ||
}} | }} | ||
[[File:Re_entry. | [[File:Re_entry.svg|thumb|left|[[Re-entry]] as seen in AVNRT]] | ||
'''AV Nodal Re-entry Tachycardia (AVNRT)''' or Atrial-Ventricular Nodal Re-entry Tachycardia is a [[SVT|supra-ventricular arrhythmia]], and more precisely, a nodal arrhythmia. AVNRT is the most frequently occurring form of regular tachycardia. More females than males have signs of AVNRT. The ratio is approximately 3:1. Symptoms are bouts of fast heart rates with sudden onset. Neck vein palpitations can be prominent (the 'Frog Sign'). Termination is often possible with valsalva manouevres (blowing on wrist, squatting, carotid sinus massage) or medication (adenosine, verapamil, diltiazem), or electrocardioversion. An AVNRT is a regular rhythm with a rate of 180-250 /min. A condition for AVNRT to occur is that 2 electric pathways occur in and around the AV node (a slow paced and a fast paced pathway). That gives way to the | '''AV Nodal Re-entry Tachycardia (AVNRT)''' or Atrial-Ventricular Nodal Re-entry Tachycardia is a [[SVT|supra-ventricular arrhythmia]], and more precisely, a nodal arrhythmia. AVNRT is the most frequently occurring form of regular tachycardia. More females than males have signs of AVNRT. The ratio is approximately 3:1. Symptoms are bouts of fast heart rates with sudden onset. Neck vein palpitations can be prominent (the 'Frog Sign'). Termination is often possible with valsalva manouevres (blowing on wrist, squatting, carotid sinus massage) or medication (adenosine, verapamil, diltiazem), or electrocardioversion. An AVNRT is a regular rhythm with a rate of 180-250 /min. A condition for AVNRT to occur is that 2 electric pathways occur in and around the AV node (a slow paced and a fast paced pathway). That gives way to the occurrence of re-entry. | ||
Two forms of AVNRT occur: typical and atypical AVNRT | Two forms of AVNRT occur: typical and atypical AVNRT | ||
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<gallery> | <gallery> | ||
File:ECG000012.jpg|Another example of AV nodal re-entry tachycardia | File:ECG000012.jpg|Another example of AV nodal re-entry tachycardia | ||
Image:avnrt_ecg.jpg|AV Nodal Re-entry Tachycardia (AVNRT) terminated by adenosine injection. Note that the last complex of the tachycardia has a retrograde P wave. | Image:avnrt_ecg.jpg|AV Nodal Re-entry Tachycardia (AVNRT) terminated by adenosine injection. Note that the last complex of the tachycardia has a retrograde P wave. Termination by block in the slow pathway is typical for common type AVNRT | ||
Image:avnrt_ecg2.jpg|AV Nodal Re-entry Tachycardia (AVNRT) | Image:avnrt_ecg2.jpg|AV Nodal Re-entry Tachycardia (AVNRT) | ||
</gallery> | </gallery> | ||