23rd September 2021

A 73-year-old male presents to the emergency department with severe chest pain

A 73-year-old male presents to the emergency department with severe chest pain, which he rates as 9 out of 10 in severity. The pain had started earlier that day when he felt dizzy, and his heart began beating really fast. His past medical history includes chronic obstructive pulmonary disease and myocardial infarction, for which he had a coronary artery bypass graft. There is no significant family history. He does not drink alcohol and quit smoking 10 years ago. His ECG shows a regular rate of 150 beats/min, and the QRS complexes are all similar in shape and about the width of 4 small squares.

Which of the following is the most likely diagnosis?

Select the SINGLE most appropriate option from the list below. Select ONE option only.