22nd June 2021

An 80-year-old man presents following 3-hours of a severely painful right leg and foot

An 80-year-old man presents following 3-hours of a severely painful right leg and foot. The pain came on suddenly, is constant, and is associated with numbness of the affected leg and foot. 

Pulses are impalpable below the knee of his right lower limb, but palpable on the left side. His right leg and foot are paler and colder when compared to the left. Power is decreased on the right ankle and toe movements.

A referral to vascular surgery is made. Which of the following tests is the most important to guide initial management?

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