FIBRILLATION MONITOR AND DEFIBRILLATOR

摘要

A circuit detects the state of a heart by monitoring the continuous time average of the ratio of high slope to low slope ECG segments and effects cardioversion if a malfunction is indicated by such time average ratio exceeding a predetermined threshold. The circuit comprises an ECG monitor for sensing ECG signals from the heart, signal shaping circuitry for generating the slope of the sensed ECG signals by providing an approximation of the derivative of the input ECG, circuitry for discriminating between high slope and low slope segments, averaging circuitry for continuously time averaging the ratio of high slope to low slope segments, a threshold detector for determining whether such time average ratio of high slope to low slope segments is within predetermined threshold limits indicative of normalcy and circuitry for effecting cardioversion if said ratio is outside such threshold.