Diagnostic Pulse Defibrillation Assessment
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Solution Overview
Problem
Current defibrillator systems lack an effective method to determine the likelihood of defibrillation therapy success, relying on inaccurate statistical correlations and indirect information from VF waveforms, which can lead to inappropriate treatment protocols during cardiac arrest.
Innovation Solution
A system and method that apply diagnostic electrical pulses to assess the patient's physiologic response, allowing for the identification of a recommended treatment protocol based on mechanical and electrical cardiac responses, thereby enhancing the effectiveness of defibrillation therapy by determining the patient's responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical correlations and indirect VF waveform analysis are used to predict defibrillation responsiveness, then treatment protocols can be recommended, but the predictions are inaccurate and results can be corrupted by artifact
Solution Approach 1:
The patent introduces an intermediary diagnostic pulse signal between the defibrillation waveform and the heart tissue. This intermediary signal serves as a mediator to directly assess cardiac responsiveness by measuring impedance changes in response to the diagnostic pulse, rather than relying on indirect statistical correlations from VF waveform analysis. The intermediary measurement provides a more accurate and reliable indicator of defibrillation responsiveness.
2Measurement precision
If diagnostic pulses are applied to assess patient responsiveness, then appropriate resuscitation protocols can be identified, but additional time is required for assessment
Solution Approach 1:
The patent applies partial action by using a low-energy diagnostic pulse that is sufficient to assess cardiac responsiveness but excessive enough to elicit a measurable impedance change. This partial diagnostic signal provides the necessary information to determine defibrillation responsiveness without delivering full defibrillation energy, thereby reducing the time required for accurate assessment while maintaining measurement precision.
3Productivity
If immediate defibrillation therapy is administered without assessment, then rapid perfusion restoration may be achieved, but inappropriate treatment may be delivered to patients who would respond better to CPR or drugs
Solution Approach 1:
The patent implements preliminary action by administering a diagnostic pulse before committing to full defibrillation therapy. This preliminary assessment measures impedance changes in response to the diagnostic signal, providing advance information about cardiac responsiveness. Based on this preliminary data, the system can determine whether immediate defibrillation is appropriate or whether alternative treatments such as CPR or drug administration would be more effective, thereby ensuring treatment appropriateness while maintaining rapid response.
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 enables quick, noninvasive, and simple implementation in existing defibrillation devices, allowing for immediate and appropriate resuscitation protocols, such as CPR or drug administration, to enhance the patient's responsiveness to defibrillation therapy, potentially saving lives by improving treatment efficacy during cardiac arrest.
Implementation Method 1
A defibrillator provides an electrical stimulus to the heart in an attempt to convert the irregular heat beat to a normal sinus rhythm
Implementation Method 2
The defibrillator measures impedance changes in response to the diagnostic pulse to determine a likelihood that the patient's heart will respond to defibrillation therapy
Data Source
AI summary
An external defibrillator system is disclosed that generates and applies a diagnostic signal to the patient in conjunction with defibrillation therapy. The diagnostic signal is designed to elicit a physiologic response from the patient's heart, namely, mechanical cardiac response and electrical cardiac response, electrical cardiac response only, or no cardiac response. Depending upon the type of cardiac response detected, the system selects an appropriate resuscitation protocol that considers the likely responsiveness of the patient to defibrillation therapy. In one practical embodiment, a stimulus signal is applied to patients that show mechanical and electrical capture in response to the diagnostic signal. The stimulus signal maintains the mechanical capture (and, therefore, perfusion) for a period of time prior to the delivery of a defibrillation pulse.