Defibrillator Dynamic CPR Protocol ROSC Score
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Solution Overview
Problem
Current defibrillators face challenges in determining the optimal CPR protocol and timing of defibrillation shocks during cardiac arrest, as existing methods for analyzing ECG waveforms are not entirely accurate and can lead to delayed or inappropriate interventions, affecting patient survival rates.
Innovation Solution
A defibrillator that calculates a Return of Spontaneous Circulation (ROSC) score from the ECG waveform to automatically determine the likelihood of successful resuscitation, adjusting CPR protocols and potentially delivering shocks based on this score, while minimizing interruptions to CPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If ECG waveform analysis is performed to determine defibrillation timing, then defibrillation shock timing can be optimized, but analysis accuracy is insufficient leading to delayed or inappropriate interventions
Solution Approach 1:
The patent changes the parameters used for ECG analysis by incorporating multiple features including amplitude, frequency content, and waveform morphology. By analyzing multiple parameters simultaneously rather than relying on a single parameter, the system achieves more accurate rhythm classification and defibrillation timing decisions, resolving the contradiction between speed and accuracy.
2Speed
If CPR protocol is interrupted to analyze ECG for shock determination, then defibrillation can be delivered timely, but patient survival rate decreases due to CPR interruptions
Solution Approach 1:
The patent implements continuous real-time ECG monitoring and analysis during CPR, providing feedback about rhythm detection confidence and shockability assessment. This allows the system to identify optimal moments to pause CPR for shock delivery based on accumulated analysis, rather than using fixed interruption intervals. The feedback mechanism enables timely defibrillation while minimizing CPR interruptions, resolving the contradiction between speed and reliability.
Data Source
AI summary
An automated external defibrillator (AED) (10) having a treatment decision processor (28) is described which follows a “shock first” or a “CPR first” rescue protocol after identification of a treatable arrhythmia, depending upon an estimate of the probability of successful resuscitation made from an analysis of a patient parameter measured at the beginning of the rescue. The invention may also follow different CPR protocols depending on the estimate. The invention also may use the trend of the measured patient parameter to adjust the CPR protocol either during a CPR pause or after the initial CPR pause. The AED (10) thus enables an improved rescue protocol.