CASE #12: Bob is a 68-year-old male who presents to the ER late one evening complaining of increasing
shortness of breath, dizziness, and the sensation of his "heart racing." On admission, his HR is 160 bpm,
BP 100/50 mm Hg, RR 26 bpm, and Oâ‚‚ sat 88% on room air. An ECG shows a rhythm with no visible P
waves and an irregular QRS complex.
What is your initial diagnosis?
