You notice an ECG of a patient has a PRI that is consistently 0.20 second long. There is a P wave for every QRS complex, but there is not a QRS complex for every P wave. Which of the following is most likely this patient’s rhythm?

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You notice an ECG of a patient has a PRI that is consistently 0.20 second long. There is a P wave for every QRS complex, but there is not a QRS complex for every P wave. Which of the following is most likely this patient’s rhythm?