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The Griffith algorithm works differently than the algorithms mentioned before now as it seeks to diagnose SVT. If the criteria are not met, then VT is diagnosed. The basis of the Griffith algorithm is quite simple: if typical bundle branch block morphology is present, then it is SVT. It has similar diagnostic characteristics to the Brugada and aVR Vereckei algorithms.
LBBB Criteria:
rS or QS wave in leads V1 and V2
delay to S wave nadir <70ms
R wave and no Q wave in lead V6
Source: ACLS Medical Training
By the Griffith criteria, this is SVT with LBBB. There is an rS wave in V1 and V2, delay to S wave nadir<70ms, and no Q wave in V6.
RBBB Criteria:
RSR' in V1 and RS in V6
R wave height greater than S wave depth
Source: ECGPedia
RBBB pattern with RSR' in V1, RS pattern in V6, and R wave height greater than S wave depth all consistent with SVT with aberrancy.
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