ankle /brachial pressure is index used to determine vascular disease
it have many value
>1.4 = calcification-vessel hardening = refer to vascular specialist
1-1.4=normal = no need to refer
0.9-1=acceptable = no need to refer
0.8-0.9=some arterial disease =treat risk factor
0.5-0.8=moderate arterial disease =refer to vascular specialist
<0.5 = severe arterial disease = refer to vascular specialist
according to leg ischemia , there is fontine classification
I : asymptomatic
IIa: mild claudication
IIb: moderate-severe claudication
III: ischemic rest pain
IV: ulceration or gangrene
so if patient present to you with leg pain you should cover this points in the history
1-is claudication severe(make patient can't keep walking) or mild(II)
2-is there rest pain (III)
3-by examination , is there ulceration-gangrene(IV)