Automated Phrenic Nerve Stimulation Testing for Cardiac Pacing
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Solution Overview
Problem
Current methods for cardiac pacing therapies, such as CRT, are time-consuming and burdensome for clinicians due to the need for extensive testing of multiple electrode vectors to avoid phrenic nerve stimulation (PNS) and determine optimal pacing capture thresholds, which can lead to inefficient selection of pacing vectors.
Innovation Solution
An automated system and method for performing phrenic nerve stimulation and pacing capture threshold testing, utilizing an implantable medical device (IMD) with multipolar leads and advanced circuitry to simultaneously test multiple pacing vectors for cardiac response and PNS, allowing for efficient selection of optimal pacing vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electrode vectors are tested manually for pacing capture threshold and PNS, then accurate pacing vector selection is achieved, but the testing process becomes time-consuming and burdensome
Solution Approach 1:
The patent segments the testing process by automatically evaluating multiple electrode vectors through systematic iteration. The IMD sequentially tests each bipolar electrode combination independently, breaking down the complex manual testing task into discrete automated segments that can be processed efficiently without clinician intervention for each vector.
Solution Approach 2:
The system performs self-service by automatically conducting all necessary measurements without requiring repeated manual intervention. The IMD autonomously iterates through multiple electrode vectors, performs pacing captures, detects PNS using acoustic sensors, and determines optimal vectors without clinician involvement beyond initial setup and final result review.
2Reliability
If comprehensive testing of multiple electrode vectors is performed, then optimal pacing therapy is achieved, but the complexity of the testing process increases
Solution Approach 1:
The patent merges multiple testing functions into a single automated process. The IMD combines pacing pulse delivery, cardiac capture detection, PNS detection using acoustic sensors, and vector selection into one integrated automated workflow. This consolidation reduces the perceived complexity by presenting a unified process rather than separate manual testing steps.
Solution Approach 2:
The system implements feedback mechanisms where the acoustic sensor continuously monitors for PNS during pacing delivery. The detected acoustic signals provide real-time feedback about phrenic nerve stimulation, allowing the automated system to adjust and select vectors that minimize PNS while maintaining effective cardiac pacing, thereby managing complexity through intelligent feedback control.
3Measurement precision
If repeated testing of different vectors is performed, then accurate pacing capture threshold determination is achieved, but patient burden increases
Solution Approach 1:
The IMD performs self-service by autonomously conducting all repeated vector testing without requiring patient participation beyond the initial implant. The device automatically iterates through multiple electrode vectors, delivers pacing pulses, and evaluates outcomes, eliminating the need for the patient to remain engaged or undergo repeated manual testing procedures.
Solution Approach 2:
The testing process maintains continuity by automatically proceeding through all necessary vector evaluations in a seamless automated sequence. Rather than interrupting the patient for repeated manual testing sessions, the IMD continuously performs the complete testing protocol in one uninterrupted automated process, reducing patient burden while maintaining measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the time and effort required for clinicians to select appropriate pacing vectors, minimizing PNS and ensuring effective cardiac pacing while optimizing therapy delivery.
Implementation Method 1
delivering a pacing capture threshold signal along a selected vector
Implementation Method 2
an acoustic sensor signal is monitored for PNS
Data Source
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AI summary
A medical device system for determining pacing threshold data that includes a cardiac capture sensor, a phrenic nerve stimulation sensor, a pulse generator selectively coupled to a plurality of electrode vectors to deliver a phrenic nerve stimulation pulse, and a processor coupled to the cardiac capture sensor, the phrenic nerve stimulation sensor and the pulse generator and configured to deliver the phrenic nerve stimulation pulse along the plurality of electrode vectors, determine, for each vector of the plurality of vectors, whether phrenic nerve stimulation is detected in response to the delivered phrenic nerve stimulation, deliver a pacing pulse along only the vectors of the plurality of vectors that phrenic nerve stimulation is determined not to be detected, and determine pacing capture thresholds in response to the delivered pacing pulse.