AED Dual Rhythm Analysis Algorithm for CPR Artifact Reduction
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Solution Overview
Problem
Current Automated External Defibrillators (AEDs) face challenges in quickly and accurately determining shockable cardiac rhythms during cardiopulmonary resuscitation (CPR), leading to delays in delivering defibrillation shocks due to motion artifacts from chest compressions, which can impact patient survival.
Innovation Solution
The implementation of an AED with a dual rhythm analysis algorithm system, where one algorithm starts immediately after CPR instructions are given and another starts with a delayed onset to verify the presence of a shockable rhythm, minimizing the impact of CPR artifacts and allowing for rapid and accurate classification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rhythm analysis algorithm is used in AED, then the device complexity is reduced, but the measurement precision and reliability of shockable rhythm detection deteriorates due to CPR motion artifacts
Solution Approach 1:
The rhythm analysis process is segmented into two distinct algorithms: a first algorithm that performs initial rhythm classification, and a second algorithm that performs verification analysis. This segmentation allows each algorithm to specialize in different aspects of rhythm detection, with the first algorithm providing rapid initial assessment and the second algorithm providing verified confirmation, thereby improving measurement precision without excessive complexity increase
Solution Approach 2:
The patent introduces an intermediary verification mechanism where the second algorithm acts as a mediator to confirm the findings of the first algorithm. This intermediary step filters out false positives caused by CPR motion artifacts while maintaining rapid detection capability, resolving the contradiction between speed and accuracy
2Loss of time
If rhythm analysis is performed immediately after CPR instructions, then the time to shock is reduced, but the measurement precision deteriorates due to ongoing CPR motion artifacts
Solution Approach 1:
The first rhythm analysis algorithm performs preliminary action by conducting initial rhythm classification immediately when CPR instructions are given, before the patient is moved or CPR is interrupted. This preliminary assessment captures early rhythm information that would be lost if waiting for complete CPR cessation, reducing time to shock while maintaining acceptable accuracy through the subsequent verification step
Solution Approach 2:
The patent maintains continuity of useful action by performing rhythm analysis continuously during CPR without requiring interruption of compressions. Both algorithms operate on ECG data acquired during ongoing CPR, eliminating the need to stop compressions for rhythm assessment and thereby minimizing interruptions to chest compressions while maintaining detection accuracy
3Measurement precision
If CPR is interrupted to obtain clean ECG signal, then the measurement precision improves, but the productivity and patient outcome deteriorates due to delayed defibrillation
Solution Approach 1:
The patent extracts the harmful CPR motion artifacts from the analysis process through the second verification algorithm, which is specifically designed to identify and filter artifacts while preserving true rhythm signals. This extraction allows accurate rhythm detection to proceed without requiring physical removal or interruption of CPR compressions, maintaining both signal quality and continuous resuscitation
Data Source
AI summary
An automated external defibrillator (AED) and methods for reducing the delay between termination of cardiopulmonary resuscitation (CPR) and administration of a defibrillating shock, among other disclosed apparatus and methods. In one embodiment, the AED includes an ECG sensor that obtains an ECG signal corresponding to patient heart activity and a prompting device that provides instructions regarding cardiopulmonary resuscitation. The AED also has a control system including a microprocessor programmed to run two rhythm analysis algorithms after instructions to terminate CPR. The two rhythm analysis algorithms analyze segments of the ECG signal for recognizing the presence of a shockable rhythm, with one algorithm having a delayed start relative to the other algorithm. The AED additionally includes a therapy generation circuit for treating the shockable rhythm with a defibrillation pulse in response to the control system determining the presence of a shockable rhythm.