A patient who is complaining of a "racing" heart and feeling "anxious" comes to the emergency department. The nurse places the patient on a heart monitor and obtains the following electrocardiographic (ECG) tracing. 
Which action should the nurse take next?
A) Prepare to perform electrical cardioversion.
B) Have the patient perform the Valsalva maneuver.
C) Obtain the patient's vital signs including O2 saturation.
D) Prepare to give a b-blocker medication to slow the heart rate.
Correct Answer:
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