This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
The normal ankle brachial pressure index (ABPI) is 1.0.A value of 0.8 suggests 
Select and explain. 
A. Good flow, B. Some degree of alterial obstruction, C. Impending gangrene, D. Presence of collaterals
B: Some degree of alterial obstruction
Answer: B: Some degree of alterial obstruction 
Explanation: . The normal value of Ankle Brachial Pressure index (ABPI) will be less than 0.3.one should check blood pressure in all the 4 limbs.ABPI is checked in supine position;systolic blood pressure in upper and lower limbs is checked and higher value of each extremities is taken;ABPI is calculated.Results->0.9 is normal ;.70-0.89 is mild disease; 0.50-0.69 is moderate;< 0.50 is severe. Refer page no 171 of SRB's manual of surgery 5 th edition.