Shifting Ventricular Fibrillation Drive Mechanism as Time Progresses
نویسندگان
چکیده
منابع مشابه
Mechanism of ventricular fibrillation in hypothermia.
• Two general theories of cardiac fibrillation currently prevail: the circus movement theory of Garrey and Lewis, and the ectopic focus theory of Sherf and Prinzmetal. Surprisingly, little systematic work has been done to establish whether either of these theories applies to the cardiac fibrillation that occurs spontaneously when mammals are cooled. The circus movement theory postulates repetit...
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Ventricular muscle strips of the rat embryo heart were used for tissue culture preparations without adding trypsin. Fibrillation-like arrhythmia was induced by adding aconitine or strophanthin, and the potentials were recorded with one or two microelectrodes. The tracing by one microelectrode was no different than tracings from fibrillating adult mammalian hearts. The size and shape of the acti...
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Ventricular fibrillation (VF) is the main immediate cause of sudden, unexpected cardiac death. It appears in the electrocardiogram (ECG) as an aperiodic, irregular rhythm, giving the impression that electrical activation of the ventricles is highly complex and disordered. Unfortunately, despite many years of research and speculation, it has still not been possible to confirm or reject that idea...
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Left ventricular ejection time (LVET; indirect carotid pulse) was studied in 48 patients with atrial fibrillation. In comparison with normal individuals in normal sinus rhythm, ejection times for similar cycle lengths were usually short in patients with atrial fibrillation. Patients without mitral valve disease usually show increasing ejection times following increasing cycle lengths until a ce...
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The strength-duration curve for cardiac excitation can be modeled by a parallel resistor-capacitor circuit that has a time constant. Experiments on six pigs were performed by delivering current from the X26 Taser dart at a distance from the heart to cause ventricular fibrillation (VF). The X26 Taser is an electromuscular incapacitation device (EMD), which generates about 50 kV and delivers a pu...
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ژورنال
عنوان ژورنال: JACC: Clinical Electrophysiology
سال: 2015
ISSN: 2405-500X
DOI: 10.1016/j.jacep.2015.05.004