UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 1032
Question:
A 69 year old female is in the hospital for digitalis toxicity. Her blood pressure is 150/95 and her heart rate is 50 beats per minute. Her ECG shows QRS complexes that are not preceded by a P wave. These are normal looking QRS complexes, but they are not preceded by a P wave. There are retrograde P waves appearing after the QRS complex. What is the most appropriate description of the ECG findings?

a) atrial flutter
b) sinus tachycardia
c) complete heart block
d) First degree AV block
e) junctional rhythm