DEFIBRILLATOR CONTROL SYSTEM

摘要

A pattern recognition system for use in an implantable cardioverter defibrillator that is capable of responding correctly to abnormal activity of the heart efficiently and specifically. The system of the present invention first establishes a template representing the point above which or below which actual sample values, as obtained via a sampler (12), would be remarkable. Against the median are compared sampled values within a window having a pre-programmed length. For each cycle, a comparison is made between the template median and every value sampled within this pre-programmed window. Each cycle is then individually diagnosed by a trained classifier (16) such that if a selected value is above a particular pre-established threshold or below a particular pre-established threshold it will be classified as diseased. A plurality of specific cycles must be classified "diseased" in order for a final diagnosis to be made that the individual is experiencing arrhythmia. The system of the present invention is also capable of differentiating between types of disease and can classify the disease as being either ventricular tachycardia or venticular fibrillation.