Vereckei aVR Algorithm (VT vs SVT)
Vereckei aVR algorithm (2008) for wide-complex tachycardia.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Step 1: initial dominant R wave in aVR
- Yes
Result: Ventricular tachycardia -- Step 1: initial dominant R wave in lead aVR is positive (first positive step ends the algorithm).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Steps
- Step 1 initial dominant R wave in aVR, Step 2 initial r or q wave > 40 ms, Step 3 notch on the descending limb of a negative-onset QRS, Step 4 ventricular activation-velocity ratio vi/vt <= 1.
- Verdict
- a "yes" at any step diagnoses ventricular tachycardia and stops; all four negative is supraventricular. Uses lead aVR only. Cross-links brugada-vt.
What you enter
- Step 1: initial dominant R wave in aVR
- Step 2: initial r or q wave > 40 ms in aVR
- Step 3: notch on the descending limb of a negative-onset QRS
- Step 4: ventricular activation-velocity ratio vi/vt <= 1
How this is calculated
Vereckei A, Duray G, Szenasi G, et al. New algorithm using only lead aVR for differential diagnosis of wide QRS complex tachycardia. Heart Rhythm. 2008;5(1):89-98. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.