Related Experiment Videos
Diagnostic value of single versus dual chamber electrograms recorded from an implantable defibrillator
Michael H Kim1, David Bruckman, Christian Sticherling
1Section of Cardiology, Rush-Presbyterian-St. Luke's Medical Center, 1653 W. Congress Parkway, Room 983 Jelke, Chicago, IL 60612, USA. Michael_Kim@rush.edu
Insights
Including both atrial and ventricular electrograms significantly improves tachycardia diagnosis from implantable defibrillators. This dual-chamber data enhances clinician accuracy and confidence in identifying arrhythmias.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Device Technology
Background:
- The diagnostic utility of ventricular electrograms alone versus combined atrial and ventricular electrograms for tachycardia identification from implantable defibrillators remains unclear.
- Clinician diagnostic accuracy and confidence are critical factors in managing tachyarrhythmias.
Purpose of the Study:
- To evaluate the impact of using both atrial and ventricular electrograms compared to ventricular electrograms alone on clinician diagnostic accuracy and confidence for tachycardias recorded by implantable defibrillators.
Main Methods:
- Fifty-two tachycardia episodes from dual-chamber defibrillators were reviewed in two tests: one with only ventricular electrograms, and another with both atrial and ventricular electrograms.
- Reviewers assessed specific diagnosis, chamber of origin, and confidence levels for each test.
- Statistical analysis included McNemar's test for accuracy and analysis of variance for confidence.
Main Results:
- Overall accuracy for specific diagnosis improved from 61% to 79% (p < 0.001) when both electrograms were used.
- Accuracy for identifying the chamber of origin increased from 76% to 90% (p < 0.001) with dual-chamber data.
- Reviewer confidence showed a positive correlation with diagnostic accuracy.
Conclusions:
- Dual-chamber defibrillators significantly enhance clinician diagnostic accuracy and confidence in identifying tachycardias.
- Improved diagnostic capabilities may lead to more targeted and effective therapeutic interventions for patients.
Introduction:
The clinical utility of ventricular electrograms in comparison to atrial and ventricular electrograms in diagnosing the type of tachycardias recorded by an implantable defibrillator has not been addressed from the standpoint of a clinician's diagnostic accuracy and confidence in that diagnosis.
Methods:
Fifty-two tachycardia episodes recorded from dual chamber defibrillators were divided into two tests. The initial test contained only information from the ventricular electrogram and the second test contained information from both the atrial and ventricular electrograms. For each test, the reviewers were asked to provide the specific diagnosis, the originating chamber of origin of the tachycardia, and the confidence of their responses for each question. McNemar's test for matched pairs was used to determine accuracy and an analysis of variance to determine reviewer confidence.
Results:
The overall accuracy for both the specific diagnosis (61% vs. 79%; p < 0.001) and the chamber of origin (76% vs. 90%; p < 0.001) improved when both the atrial and ventricular electrograms were available for review. Reviewer confidence appeared to correlate with diagnostic accuracy.
Conclusions:
The data clearly show the favorable impact of dual chamber defibrillators on the diagnostic accuracy and confidence of clinicians faced with a clinical tachycardia recorded from an implantable defibrillator. Such improvements may translate into more focused and appropriate therapeutic interventions.