Dec 20, 2007

Identifying potentially shockable rhythms without interrupting cardiopulmonary resuscitation

Critical Care Medicine
Yongqin LiMax Harry Weil


Current versions of automated external defibrillators (AEDs) mandate interruptions of chest compression for rhythm analyses because of artifacts produced by chest compressions. Interruption of chest compressions reduces likelihood of successful resuscitation by as much as 50%. We sought a method to identify a shockable rhythm without interrupting chest compressions during cardiopulmonary resuscitation (CPR). Experimental study. Weil Institute of Critical Care Medicine, Rancho Mirage, CA. None. Electrocardiographs (ECGs) were recorded in conjunction with AEDs during CPR in human victims. A shockable rhythm was defined as disorganized rhythm with an amplitude > 0.1 mV or, if organized, at a rate of > or = 180 beats/min. Wavelet-based transformation and shape-based morphology detection were used for rhythm classification. Morphologic consistencies of waveform representing QRS components were analyzed to differentiate between disorganized and organized rhythms. For disorganized rhythms, the amplitude spectrum area was computed in the frequency domain to distinguish between shockable ventricular fibrillation and nonshockable asystole. For organized rhythms, in victims in whom the absence of a heartbeat was independently confirmed, t...Continue Reading

Mentioned in this Paper

Heart Beat
Ventricular Fibrillation
Science of Morphology
Basic Cardiac Life Support
Anterior Thoracic Region
Tachycardia, Ventricular
Sudden Death

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