Last updated 01/03/18
- Used as sequential questions and if answer to any is yes it indicates VT
- 1. Is there an absence of an RS complex in all precordial leads (concordance)?
- Are all the QRS complexes predominaly positive or all predominaly negative in V1 to V6?
- 2. R to S interval >100ms in any precordial lead?
- Measured from onset of R wave to the nadir of S wave
- 3. AV dissociation?
- P waves not associated with QRS complexes
- 4. QRS morphology criteria for VT?
- VT suggested by any of
- Concordant QRS complexes in all V1 - V6
- RS interval >100ms in any precordial lead (V1 - V6)
- AV dissociation
- Dominant R wave in V1/V2 plus (Right Bundle Branch Block (RBB) morphology)
- V1/V2 smooth monophasic R wave
- Or V1/V2 notched downslope R wave
- Or V1/V2 qR complex
- Or V6 QS complex or R/S ratio <1
- Dominant S wave in V1/V2 plus (Left Bundle Branch Block (RBB) morphology)
- V1/V2 initial R wave >30ms
- Or V1/V2 notched or slurred S wave
- Or V1/V2 RS interval >60ms
- Or V6 QS complex
- Or V6 qR complex
- SVT with aberrancy