Defibrillation success is not associated with near field electrogram complexity or shock timing
| Autor: | Go Suzuki, Peter Faris, Shane Kimber, L. Joshua Leon, Edward J. Vigmond |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
medicine.medical_specialty
Time Factors Defibrillation medicine.medical_treatment Electric Countershock Context (language use) Coronary Artery Disease Sensitivity and Specificity Defibrillation threshold Internal medicine medicine Humans Prospective Studies Fibrillation Receiver operating characteristic business.industry medicine.disease Shock (mechanics) Defibrillators Implantable Treatment Outcome ROC Curve Ventricular fibrillation Ventricular Fibrillation Cardiology medicine.symptom Cardiology and Cardiovascular Medicine business Cardiomyopathies Electrophysiologic Techniques Cardiac Energy (signal processing) |
| Zdroj: | The Canadian journal of cardiology. 29(9) |
| ISSN: | 1916-7075 |
| Popis: | Background It has been suggested that more-complex fibrillation requires higher energy shocks to terminate. Furthermore, animal studies have demonstrated that shock timing also plays a role. The objective of this study was to test these assertions in a clinical context. Methods Near- and far-field electrograms were collected during defibrillation threshold testing. Fibrillation complexity was measured by quantifying the organization in the signals with wavelet-based methods, scaling exponent, and cross-correlation analysis. Receiver operator characteristic curves were used to determine predictive value. The effect of the phase at which defibrillation shocks were applied was also determined. Results No measure was able to classify whether a particular shock would be successful. All performed very poorly. Shock timing played no role in defibrillation outcome. Conclusions Signal organization of a local electrogram and phase of shock delivery do not relate to minimum defibrillation shock energy immediately after ventricular fibrillation onset. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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