Wearable Cardiac Monitor Alert Delay Logic
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Solution Overview
Problem
Wearable Cardioverter Defibrillators (WCD) often issue frequent and bothersome alerts, leading to patient annoyance and reduced compliance, as they attempt to balance alerting for critical conditions with minimizing false alarms.
Innovation Solution
The WCD system incorporates a processor that detects events, classifies them, and determines an alarm onset time based on the classification, allowing for delayed issuance and resolution of alerts to confirm the existence or resolution of conditions, thereby reducing transient alerts and enhancing patient confidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WCD issues alerts immediately upon detecting potential arrhythmias or system conditions, then the reliability of alerting critical conditions is improved, but the quantity of alerts increases leading to patient annoyance and reduced compliance
Solution Approach 1:
The system performs preliminary actions by waiting for a predetermined period before issuing an alert after detecting a condition. This delay allows transient conditions to resolve themselves before triggering an alert, thereby reducing false alarms while maintaining reliable notification of genuine critical conditions.
Solution Approach 2:
The system implements feedback mechanisms where detected conditions are monitored over time to determine if they persist or resolve. The alert issuance is based on feedback from continuous monitoring, adjusting the alert state based on whether the condition remains present after the predetermined period.
2Ease of operation
If the WCD delays alert issuance to filter transient conditions, then patient compliance improves, but the time to alert critical conditions increases
Solution Approach 1:
The system performs preliminary monitoring and classification of conditions before alerting. By categorizing conditions as transient or critical based on their characteristics and duration, the system can delay alerts for transient conditions while maintaining rapid response for critical ones that require immediate attention.
Solution Approach 2:
The system applies different quality characteristics to different types of conditions. Critical conditions trigger immediate alerts regardless of duration, while transient conditions are subject to the delay filter. This localized differentiation ensures that the time delay only affects non-critical conditions, preserving rapid response for life-threatening situations.
Data Source
AI summary
A wearable cardiac monitoring device is described. The wearable cardiac monitoring device includes a sensor, a support structure configured to position the sensor to sense a cardiac parameter when the support structure is worn by a patient, and a processor communicatively coupled to the sensor. The processor is configured to detect an event at the wearable cardiac monitoring device, determine a category of the detected event based on at least one of a plurality of device conditions, and determine whether the detected event has ended. The processor is further configured to determine an offset time for the categorized event based on the at least one of the plurality of device conditions and delay a resolution of an alert based on the offset time.