A 52-Year-Old Man with Recent-Onset Dizziness

Case
A 52-year-old man presented to urgent care with a 2-day history of dizziness. He denies chest pain, syncope, shortness of breath, or diaphoresis. He is not taking any medications, and has no noteworthy personal medical history.

Upon exam, you find:

• General: Alert and oriented X 3, slightly pale
• Lungs: CTAB
• Cardiovascular: Irregularly irregular and tachycardic without murmur, rub, or gallop
• Abdomen: Soft and NT, no pulsatile mass
• Ext: No peripheral edema, pulses are 2+ and equal in all extremities

View the ECG taken and consider what the diagnosis and next steps would be. Resolution of the case is described on the next page.