Implantable Blood Pump Heart Rate Estimation During Tachyarrhythmia
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Solution Overview
Problem
Existing implantable blood pumps face challenges in accurately estimating heart rate, particularly during conditions of low pulsatility and tachyarrhythmia, which can lead to unreliable pump control and adverse events.
Innovation Solution
A method and system that continuously detect cardiac cycles, filter out unreliable conditions such as low pulsatility and tachyarrhythmia, and modify heart rate estimation accordingly, using a secondary source of information to control the blood pump during such conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heart rate is estimated using cardiac cycle detection during low pulsatility conditions, then continuous monitoring is maintained, but the heart rate estimation becomes unreliable
Solution Approach 1:
The system continuously monitors pulsatility and uses this feedback to determine whether cardiac cycle data is reliable enough for heart rate estimation. When pulsatility falls below a threshold indicating unreliable conditions, the system switches to alternative estimation methods or excludes the data from calculations, thereby maintaining overall reliability while preserving continuous monitoring capability
Solution Approach 2:
The system changes the parameter used for heart rate estimation based on the reliability of cardiac cycle data. During reliable conditions, it uses cardiac cycle length; during unreliable conditions (low pulsatility), it switches to alternative parameters or methods, ensuring measurement accuracy is maintained across varying physiological states
2Productivity
If cardiac cycle data is used for pump control during tachyarrhythmia, then responsive control is maintained, but adverse events may occur due to unreliable control
Solution Approach 1:
The system monitors cardiac cycle characteristics and uses this feedback to detect tachyarrhythmia conditions. When arrhythmia is detected, the system modifies pump control parameters or switches to alternative control strategies, maintaining responsiveness while preventing harmful effects from unreliable control
Solution Approach 2:
The system takes preliminary action by detecting tachyarrhythmia conditions before they lead to adverse events. By identifying unreliable cardiac cycle patterns early, the system preemptively adjusts pump control or alerts the user, preventing the harmful effects of inappropriate control during arrhythmic episodes
3Measurement precision
If manual review of waveforms by physician is used, then comprehensive analysis is possible, but heart rate estimation is not automated and may be delayed
Solution Approach 1:
The system performs self-service by automatically detecting cardiac cycles, evaluating pulsatility, and estimating heart rate without requiring manual physician review. It autonomously determines when data is reliable and when alternative methods are needed, providing continuous automated monitoring that maintains comprehensive analysis capability
Solution Approach 2:
The automated system continuously monitors cardiac cycle characteristics and uses this feedback to validate or reject heart rate estimates in real-time. This feedback loop enables automated comprehensive analysis, eliminating delays associated with manual review while maintaining the thoroughness of physiological assessment
Data Source
AI summary
A method of estimating a heart rate of a patient having an implantable blood pump including, during operation of the blood pump continuously detecting a plurality of cardiac cycles, each of the plurality of cardiac cycles including a length; sorting the plurality of cardiac cycles according to the length; filtering the plurality of cardiac cycles between one of a group consisting of including a reliable condition and at least one unreliable condition; continuously estimating a heart rate according to the length of the plurality of cardiac cycles and the reliable condition; and if the at least one unreliable condition is detected, modifying the estimated heart rate based on information associated with the detected at least one unreliable condition.