Question

ABPI (ankle brachial pressure index) of imminent necrosis is

• A. < 0.3
• B. 0.3
• C. < 0.6
• D. > 0.6

Hint:

The lower the index, the worse the perfusion; necrosis looms at the very lowest value.

Answer 1

The Correct Option is A

Step 1: ABPI is calculated by dividing the higher ankle systolic pressure by the brachial systolic pressure; it quantifies how badly the lower-limb arteries are narrowed.

Step 2: As the ratio falls the clinical picture deteriorates in steps: a healthy limb sits near 1.0, intermittent claudication develops below about 0.9, and rest pain emerges near 0.4.

Step 3: Once the value sinks below $0.3$ the residual blood flow is inadequate to keep tissue alive, so frank necrosis and gangrene are imminent.

Step 4: The other listed figures correspond to milder ischaemia and would not herald tissue death.

\[\boxed{\lt 0.3}\]