A tale of two fibrillations.
نویسندگان
چکیده
Sudden cardiac death remains a major public health problem in the United States. Ventricular fibrillation (VF) is the most common arrhythmia that directly leads to sudden cardiac death. However, the mechanisms of VF are unclear. Recently,1 2 different types of VF have been demonstrated in isolated, perfused rabbit hearts linked to the electrical restitution properties of the heart (ie, the dynamic dependence of action potential duration [APD] or conduction velocity [CV] on the previous diastolic interval). Type I (fast) VF is associated with a steep APD restitution, flat CV restitution, and multiple wandering wavelets. Type II (slow) VF is associated with flat APD restitution, broad CV restitution, decreased excitability, and spatiotemporal periodicity in activation maps. Our goal in this article is to explain how this new knowledge about the 2 types of VF can account for seemingly contradictory experimental findings by different investigators, and to speculate on the relevance to patient care.
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ورودعنوان ژورنال:
- Circulation
دوره 108 19 شماره
صفحات -
تاریخ انتشار 2003