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Figure 1: M-mode measurement of R-R interval showing 2:1 ventricular to atrial rate with a ventricular rate of 229 bpm (A), and an atrial rate of 108 bpm (B)

Figure 1: M-mode measurement of R-R interval showing 2:1 ventricular to atrial rate with a ventricular rate of 229 bpm (A), and an atrial rate of 108 bpm (B)