Implantable Device Extended Capture Detection Test
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Solution Overview
Problem
Current methods for detecting inadequate capture in cardiac pacing, such as cardiac resynchronization therapy (CRT), may fail to detect intermittent loss of capture due to lead movement or dislodgment, leading to misinterpretation of patient condition and potential worsening of heart failure.
Innovation Solution
An implantable medical device (IMD) performs a brief periodic capture detection test and switches to an extended capture detection test lasting up to 24 hours when inadequate capture is detected, recording metrics to provide detailed data on capture and loss of capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If brief periodic capture detection tests are performed to conserve battery power, then energy consumption is reduced, but intermittent loss of capture may go undetected
Solution Approach 1:
The system dynamically adjusts the duration of capture detection tests based on detected conditions. When inadequate capture is detected during a brief test, the system automatically extends the test duration to perform more comprehensive monitoring, thus adapting the monitoring strategy to the actual clinical situation while conserving battery power during normal operation
Solution Approach 2:
The system uses feedback from the capture detection test results to control subsequent monitoring behavior. When inadequate capture is detected, the feedback triggers an extended capture detection test to confirm and characterize the loss of capture, creating a closed-loop monitoring system that balances power consumption with detection reliability
2Reliability
If extended capture detection tests are performed continuously to ensure complete monitoring, then detection reliability is improved, but battery power is depleted faster
Solution Approach 1:
The system employs periodic brief capture detection tests at scheduled intervals rather than continuous monitoring. This periodic approach maintains adequate monitoring coverage while significantly reducing overall battery power consumption compared to continuous extended testing
Solution Approach 2:
The system dynamically transitions from periodic brief tests to extended continuous monitoring only when clinically indicated by inadequate capture detection, thus maintaining reliability when needed while optimizing power consumption during normal operation
3Loss of time
If capture detection tests are combined with threshold amplitude determination to improve efficiency, then test duration is reduced, but loss of capture may occur during the test itself
Solution Approach 1:
The system ensures that pacing pulses are delivered at adequate amplitudes before performing capture detection tests, cushioning against the possibility of loss of capture during testing. This preparatory step ensures reliable detection by eliminating threshold-related false positives
Solution Approach 2:
The system uses an intermediary threshold determination step to establish safe pacing parameters before conducting capture detection, thus enabling brief tests without compromising reliability by ensuring adequate capture margins are maintained throughout the test
Data Source
AI summary
Techniques are described for performing an extended capture detection test after detecting inadequate capture during a first capture detection test. An example system includes an implantable medical device that delivers pacing pulses to a patient, that periodically performs a first capture detection test to detect capture or loss of capture of the pacing pulses, and that detects inadequate capture during the first capture detection test, wherein in response to detecting the inadequate capture, the implantable medical device performs a second capture detection test that is longer than the first test. The system also includes a programmer device that programs the implantable medical device and that retrieves data from the implantable medical device corresponding to the second capture detection test. The example system may conserve battery power and prevent loss of current by performing the extended capture detection test only after detection of inadequate capture during the first test.