Ischaemia in diabetes

sally.florey · Mar 8, 2009

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Hi, Can anyone please tell me why an ischaemic diabetic foot can be red? Thanks.

twirly · Mar 8, 2009

Hi Sally,

An interesting article: http://www.aswcjournal.com/pt/re/ad...JfvN1yrtgXhDGyxL!1689917466!181195629!8091!-1

Pallor and dependent rubor TOP
In the patient with arterial insufficiency, the skin of the affected extremity will be pale when the extremity is elevated to 45 degrees. With the foot in this position, test the patient's capillary refill by compressing the pad of the great toe between the forefinger and thumb. Capillary refill time should be less than 3 seconds in normal tissue. Longer refill indicates decreased perfusion.
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When the affected extremity is placed below the level of the knee (dependent position), the foot becomes dark red or ruddy. This is known as dependent rubor or reactive hyperemia. It occurs because gravity is helping the capillaries fill with blood when the foot is in this position.
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Also? A/V shunting? arterial/venous shunting.

http://physrev.physiology.org/cgi/content/abstract/83/3/933

More detailed pt. history including medication may assist you with more responses.

Best regards,

Mandy.

PS. Google Scholar: http://scholar.google.co.uk/scholar?hl=en&lr=&q= diabetic arterial insufficiency&btnG=Search

sally.florey Member

twirly Well-Known Member

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