Atrial Arrhythmia Detection via Ventricular Cycle Analysis
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Solution Overview
Problem
Current cardiac medical devices struggle to effectively monitor and detect atrial arrhythmias during intermittent instances of ventricular pacing, particularly in single-chamber devices where an adequate atrial signal is not always available.
Innovation Solution
The method employs ventricular signals to determine successive ventricular cycle lengths for detecting atrial arrhythmias, using software, hardware, or firmware in implantable or external medical devices, such as implantable cardioverter defibrillators, to classify cardiac events and identify atrial fibrillation through Lorenz plots and RR interval analysis, without requiring an atrial signal source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventricular pacing is used to regulate heart rhythm, then ventricular rhythm control is improved, but atrial arrhythmia detection capability deteriorates
Solution Approach 1:
The patent uses ventricular signals as an intermediary to indirectly detect atrial arrhythmias. Instead of directly measuring atrial activity, the system analyzes ventricular cycle length variations caused by atrial arrhythmias affecting AV node conduction. This mediator approach allows atrial arrhythmia detection in devices without dedicated atrial sensing capability.
Solution Approach 2:
The patent replaces the traditional electrical signal-based atrial detection mechanism with a computational analysis of ventricular timing intervals. By substituting direct electrical field measurement with algorithmic processing of ventricular cycle lengths and RR interval variability, the system achieves atrial arrhythmia detection without requiring atrial electrodes or signal amplification hardware.
2Device complexity
If single-chamber device configuration is used, then device complexity is reduced, but atrial signal availability deteriorates
Solution Approach 1:
The patent extracts useful diagnostic information (atrial arrhythmia detection) from an unexpected source (ventricular pacing signals). By analyzing ventricular cycle length variations and RR interval patterns, the system extracts atrial rhythm information that would normally require separate atrial sensing hardware, thereby eliminating the need for complex multi-chamber configurations.
Solution Approach 2:
The patent makes the ventricular sensing system multi-functional by enabling it to perform both its primary function (ventricular rhythm monitoring) and a secondary function (atrial arrhythmia detection). This universal approach allows a single-chamber device to provide comprehensive rhythm monitoring without requiring additional specialized sensors or complex hardware architecture.
3Measurement precision
If traditional atrial signal monitoring is used, then detection accuracy is improved, but applicability to paced rhythm deteriorates
Solution Approach 1:
The patent implements dynamic analysis of ventricular cycle lengths and RR interval variability to adaptively detect atrial arrhythmias during ventricular pacing. The system continuously monitors timing variations and adjusts detection algorithms based on the presence of pacing markers, enabling accurate arrhythmia discrimination regardless of pacing status or rhythm type.
Data Source
AI summary
A method and medical device for determining a cardiac event that includes sensing a cardiac signal, determining a predetermined number of sensed cardiac events in response to the sensed cardiac signal, determining a plurality of sensed event windows in response to the predetermined number of the sensed cardiac events, determining, for each of the plurality of sensed event windows, whether a number of paced events is less than a paced event threshold, determining whether intervals within the sensed event windows having a number of paced events less than the paced event threshold are greater than an interval threshold, determining an interval difference factor for each of the plurality of windows having intervals less than the interval threshold, and determining the cardiac event in response to the interval difference factors determined for each of the plurality of windows.