초록 ▼

A method and appartus for differentiating between ventricular tachycardia and ventricular fibrillation includes a pair of electrodes located on a single catheter which, in conjunction with an implantable cardioverter device, utilize two channel ventricular algorithms for ventricular tachycardia and

A method and appartus for differentiating between ventricular tachycardia and ventricular fibrillation includes a pair of electrodes located on a single catheter which, in conjunction with an implantable cardioverter device, utilize two channel ventricular algorithms for ventricular tachycardia and ventricular fibrillation separation. Two closely spaced unipolar electrograms demonstrate similar morphology and consistency during rhythms with broad coherent activation (such as sinus rhythm and ventricular tachycardia). Conversely, for incoherent rhythms (ventricular fibrillation and polymorphic ventricular tachycardia), activation between the electrodes proved to be dissimilar and inconsistent. The cross-correlation of the two depolarizations measures similarity between electrogram morphology, and interquartile range measures consistency in a passage. The method and apparatus of the present invention is able to address the limitation of existing algorithms and provide accurate separation of ventricular fibrillation from other rhythms.

대표청구항 ▼

[ We claim:] [8.] An apparatus for differentiating between ventricular tachycardia and ventricular fibrillation, said mechanism comprising:a first sensor for placement in sensory association with the heart for producing a first signal;a second sensor for placement in sensory association with the hea

[ We claim:] [8.] An apparatus for differentiating between ventricular tachycardia and ventricular fibrillation, said mechanism comprising:a first sensor for placement in sensory association with the heart for producing a first signal;a second sensor for placement in sensory association with the heard for producing a second signal;a signal receiving apparatus for receiving said first and second signals and for producing configurations based upon said first and second signals, said first and second sensors being operatively associated with said signal receiving apparatus;a coherence determining apparatus for determining coherence of said signals based on said configuration, said coherence determining apparatus being operatively associated with said signal receiving apparatus: andmeans for differentiating between ventricular tachycardia and ventricular fibrillation, said means being operatively associated with said coherence determining apparatus and being responsive thereto.