Separation of ventricular tachycardia from ventricular fibrillation using paired unipolar electrograms

S.A. Caswell, J.A. Thompson, J.M. Jenkins, L.A. DiCarlo
Computers in Cardiology 1996  
In third-generation i~trplantable antitachycardia devices, immediate dejbrillation is necessap for ventricular jibrillation (VF) while lower-energy therapies convert trtany \~entricular tachycardias (147s). Precise distinction between true VF and VT is required iftiered-therapy is to be effectively utilized. To separate C F fronr U, this study e~trplo-ved a 1neasure.entent to quantifi the coherence between two unipolar electrogranrs fronr the sarlre catheter, where incoherence beneeen signals
more » ... dicates IF. A nor~~ralired cross correlation (CC) nreasured similarity, and standard deviation (STD) and interqtiarrile range (IQR) of the CC r~reasured consistency for sinus rhvthnr (SR). VT, and VF passages Ponr 10 patients. Patient-independent STD thresholds of 0.15-0.25 and IQR thresholds of 0.3-0.6 provided 100% sensitivity and 100% specificity. This method \clns able to successful!^ separate VF froom coherent rh?/rht~~s (SR, VT). Proper distinction of VT would allow defibrillation to be defirred for consideration of lower energy therapies, pro\~idi~tg signijkant energy smrings.
doi:10.1109/cic.1996.542458 fatcat:5fpprgs3ybetdillomntazev3e