Chronotropic Incompetence Detection via AV Interval Monitoring
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Solution Overview
Problem
Current methods for detecting chronotropic incompetence in patients are complex and inconvenient, requiring extensive clinical testing to assess a patient's ability to increase heart rate in response to physiologic demands.
Innovation Solution
An implantable medical device with a chronotropic incompetence detection circuit that initiates pacing of the atrium at a higher rate than the intrinsic rate, monitors the AV interval, and calculates changes to determine if the patient is chronotropically incompetent by exceeding a specified threshold, simplifying the testing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex clinical exertion tests are used to detect chronotropic incompetence, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The implantable medical device automatically performs chronotropic incompetence detection using its own pacing and sensing capabilities. The device initiates atrial pacing at rest, monitors AV intervals, and automatically determines chronotropic incompetence without requiring external clinical testing equipment or procedures.
Solution Approach 2:
The patent replaces complex mechanical clinical exertion testing systems with an electrical/electronic solution implemented within the implantable device. Instead of using external exercise equipment and manual monitoring, the device uses electrical pacing signals and electronic interval measurement to detect chronotropic incompetence.
2Measurement precision
If complex clinical exertion tests are used to detect chronotropic incompetence, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The device performs chronotropic incompetence detection during routine implantation or programming visits without requiring separate dedicated testing appointments. The detection is integrated into existing device interactions, utilizing the time when the patient is already present for device-related procedures.
Solution Approach 2:
The device autonomously conducts the detection protocol during brief patient visits, eliminating the need for prolonged external clinical testing. The automated nature of the test reduces both preparation time and execution time compared to traditional exertion tests.
3Ease of operation
If automated detection methods are used, then ease of operation is improved, but measurement precision may deteriorate
Solution Approach 1:
The device uses feedback from AV interval measurements during paced atrial activity to automatically determine chronotropic incompetence. The system continuously monitors the relationship between paced atrial events and ventricular responses, using this feedback to assess whether the ventricular rate appropriately tracks atrial rate changes.
Solution Approach 2:
The automated electronic detection method replaces subjective manual assessment with objective electrical measurements. The device precisely measures AV intervals and rate responses using electronic circuitry, providing accurate automated determination without requiring complex external testing equipment.
Data Source
AI summary
An apparatus comprises an implantable cardiac signal sensing circuit that provides an electrical cardiac signal representative of cardiac activity of a subject, an implantable therapy circuit that delivers electrical pacing stimulation energy to a heart of a subject, and a controller circuit. The controller circuit includes a chronotropic incompetence detection circuit that initiates pacing of an atrium of the subject at a rate higher than a device-indicated rate or a sensed intrinsic rate, monitor the AV interval, initiates an increase in the pacing rate while continuing the monitoring of the AV interval, calculates a change in AV intervals between a highest paced rate used in the monitoring and a lowest paced rate used in the monitoring, and indicates that the AV intervals are evidence of chronotropic incompetence when the calculated change in the AV intervals exceeds a specified threshold AV interval change value.