Complete the Following ECG Criteria for Atrial Fibrillation

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\begin{array}{|l|l|}\hline ext { Rhythm } & ext { Ventricular rhythm usually irregularly irregular. } \\hline ext { Rate } & \begin{array}{l} ext { Atrial rate usually } 400 ext { to } 600 ext { beats/min; ventricular rate } \ ext { variable. }\end{array} \\hline ext { P waves } & \begin{array}{l} ext { No identifiable P waves, fibrillatory waves present; erratic, } \ ext { wavy baseline. }\end{array} \\hline ext { PR interval } & ext { Not measurable. } \\hline ext { QRS duration } & 0.11 ext { seconds or less unless abnormally conducted. } \\hline\end{array}

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