Arterial vs venous ulcers: assess perfusion before choosing care

Link the wound to the circulation problem

Arterial disease limits delivery of oxygen and nutrients needed for tissue survival and healing. Ischaemic ulcers often occur on the feet or toes and may look sharply defined or punched out. Surrounding skin may be shiny or hairless, and the limb can become pale and cool when raised. An arterial wound can be painful, but coexisting nerve damage may reduce sensation, so lack of pain is not reassuring by itself.

Venous disease creates a different problem: persistent high pressure in leg veins damages the skin. Ulcers commonly occur on the lower leg, particularly the inner aspect, with ankle swelling, itching and discoloured or hardened surrounding skin. The question is therefore about both the wound and its setting. Location provides a clue, but the circulation assessment and the history carry more weight than a rule that every ankle wound must be venous.

Assess the whole limb before assigning a label

Review previous ulcers, diabetes, vascular disease, deep vein thrombosis, mobility and recent injury. Assess the skin, swelling, pain and pulses, and document the wound using the local assessment method. A person can have more than one contributor to poor healing. When findings suggest both venous congestion and impaired arterial supply, keep mixed disease in the differential instead of forcing the patient into a simple study-table category.

An ankle-brachial pressure assessment with Doppler compares ankle and arm pressures and helps evaluate arterial supply before compression is selected. It answers a different question from describing the wound surface. If the case supplies a vascular test result, interpret it within the assessment and the prescribed pathway. A nurse who recognises concerning circulation findings should escalate them rather than treating a completed dressing change as proof that the underlying problem has been addressed.

Match compression and positioning to the assessment

Compression is a central treatment for an appropriately assessed venous ulcer because it improves venous return. It should be selected and applied by trained clinicians using the vascular findings and care plan. Significant arterial insufficiency changes its safety. A question that proposes routine strong compression before assessing arterial supply contains a meaningful problem even if the wound appears venous and the patient has obvious oedema.

For a venous ulcer, prescribed compression, movement where appropriate and elevation can help reduce swelling. Arterial ulcers require attention to the inadequate blood supply and specialist assessment, alongside wound protection and the prescribed dressing plan. Do not carry a venous positioning instruction over automatically to an ischaemic limb. Worsening pain, colour change or new numbness during treatment needs prompt reassessment; continue evaluating the person, not just the bandage or wound bed.

Reason through a hypothetical dressing decision

Imagine an original practice case: a patient has a lower-leg ulcer, ankle oedema and longstanding skin discoloration. A second assessment finds a cool foot and concern about the pedal pulses. The options are to apply routine strong compression immediately, assume the oedema excludes arterial disease, obtain the required vascular assessment before choosing compression or provide only a new dressing and end the assessment. The vascular assessment is the strongest choice.

The venous clues explain why compression was considered, but the additional perfusion findings mean the plan needs clarification. Choosing compression immediately ignores information that directly affects treatment safety. Choosing a dressing alone addresses the surface without resolving the circulation question. In a revised scenario with arterial supply already assessed and an appropriate compression order in place, applying the prescribed treatment could be correct. Notice how the missing prerequisite, rather than the ulcer label, changes the answer.

Sources and further reading

MedlinePlus: Ischemic Ulcers. Arterial wound mechanism, appearance, limb findings and altered pain with nerve damage.

NHS: Venous Leg Ulcer. Venous pressure, common location, surrounding skin changes and associated swelling.

NHS: Venous Leg Ulcer Diagnosis. History, pulse assessment and Doppler pressure testing before compression decisions.

NHS: Venous Leg Ulcer Treatment. Trained compression care, swelling management and symptoms requiring reassessment.