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Review Question - QID 214554

Atrial Arrhythmias Introduction QID: 214554 (M1.OMB.1)
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QID 214554 (Type "214554" in App Search)
A 53-year-old man presents to the emergency department with lightheadedness and palpitations. He has had similar episodes in the past, but they have never lasted this long. His heart has been "racing" for 2 hours. He denies loss of consciousness, chest pain, weakness, or any changes in speech. His temperature is 97.4°F (36.3°C), blood pressure is 135/68 mmHg, pulse is 131/min, and respirations are 19/min. A stat EKG is performed and shown in Figure A. Which of the following is the most likely rate limiting portion of the cardiac conduction system?
  • A
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  • A