Di Rocco et al. Journal of Medical Case Reports 2011, 5:18 http://www.jmedicalcasereports.com/content/5/1/18 Page 4 of 6 Figure 3 ECG showing chaotic atrial tachycardia/atrial fibrillation with rapid ventricular response at a rate of 166 beats per minute. QRS, 97 ms; QTc, 492 ms. 80 mg of caffeine (0.03%), twice as much as a 12-ounce soda; and one 16-ounce can of SoBe No Fear™ contains 141 mg of caffeine, four times as much as a soda. Mountain Dew™, which is marketed along with other sodas, contains more caffeine than other typical sodas at 55 mg per 12 ounces (Figure 5) [14,15]. Little regulation occurs with the production and marketing of energy drinks in the United States of America, with caffeine content between energy drinks ranging from 50 mg to 505 mg per bottle [16]. With the lack of regulation and strong marketing campaign toward young male athletes, energy drinks are becoming a serious threat to adoles- cents and are postulated to have caused grave conse- quences in an Australian athlete [17]. Figure 4 ECG showing restoration of normal sinus rhythm to 85 beats per minute after intravenous fluids. PR interval, 117 ms; QRS, 96 ms; QTc, 416 ms.