Figure 4From: Electrocardiogram frequency change by extracorporeal blood perfusion in a swine ventricular fibrillation modelElectrocardiogram (ECG) frequencies calculated every 30 sec during ventricular fibrillation (VF). (a) Median frequency (MF) and (b) dominant frequency (DF). Oxygenated blood was supplied to a fibrillating heart after approximately 10 min. Squares and error bars indicate mean values and standard deviation, respectively.Back to article page