Nursing care
Venous Leg Ulcers nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Venous leg ulcers are treated with compression bandaging, but compression is only applied once an ankle-brachial index confirms adequate arterial flow, because compressing an ischaemic leg can cause tissue death. Assessment focuses on the wound bed, surrounding skin and pulses. Elevation, exercise and moisture-balanced dressings support healing alongside compression.
The pathophysiology in one pass
Venous leg ulcers form because the calf muscle pump has failed to return blood against gravity. Valve incompetence in the deep or superficial veins lets blood reflux downward, so pressure builds in the lower leg with every stance and step. Over months to years that sustained venous hypertension pushes fluid, fibrin and red cells out into the surrounding tissue.
The result is the picture nurses recognise on sight: a shallow, irregularly shaped ulcer above the medial malleolus, ruddy granulation tissue, moderate to heavy exudate, and skin nearby that is haemosiderin-stained, indurated and often eczematous. Healing stalls because the tissue is congested, not because it is starved of blood. That distinction is the reason the treatment is compression rather than the interventions used for an arterial wound.
Assessment findings that matter
Before any dressing goes on, the ankle-brachial index is measured. This single number decides whether compression can be applied at all — an ABI above roughly 0.8 supports standard compression, a borderline result calls for modified or reduced compression under specialist guidance, and a low ABI means arterial disease is present and compression must be withheld. Compressing an arterial leg cuts off the flow that limb already lacks and can precipitate critical ischaemia and amputation.
Beyond the ABI, assess the ulcer's location, size, depth and exudate volume, and check for the classic venous signs: lipodermatosclerosis, ankle flare, atrophie blanche, and pitting oedema that improves with elevation. Palpate pedal pulses and compare both legs. Pain in venous ulcers is typically dull and eases with elevation, unlike the severe, unremitting pain of an ischaemic ulcer. Document all of this at baseline so healing can be tracked objectively.
What the exam asks about this
NCLEX-style questions on venous leg ulcers almost always test whether the candidate checks arterial status before reaching for compression. Expect a stem describing a leg ulcer with oedema and stasis changes, followed by an answer set that includes compression bandaging, elevation, and an ABI or Doppler assessment — the correct sequence is ABI first, compression second.
Other recurring angles include distinguishing venous from arterial ulcer characteristics (location, pain pattern, pulse quality, wound appearance), recognising signs of superimposed infection, and identifying appropriate dressing choices for a moderately exudating wound. Questions may also present a scenario where a patient with a venous ulcer also has diminished pulses, expecting the test-taker to flag this as a reason to hold compression and escalate for vascular assessment rather than proceed as usual.
Nursing interventions in priority order
Confirm the ABI or arrange for one before initiating or continuing compression therapy. Once arterial sufficiency is confirmed, apply the prescribed compression system, whether that is a multi-layer bandage, compression stocking, or wrap system, and reassess fit and tolerance regularly, since limb size changes as oedema reduces.
Elevate the legs above heart level whenever the patient is seated or in bed, and encourage ankle pumps and short, regular walks to reactivate the calf muscle pump. Clean the wound bed with saline, select a dressing matched to exudate volume, protect the surrounding fragile skin from maceration with a barrier product, and address any dermatitis. Reinforce adherence, since compression only works if it is worn consistently, and most recurrence follows early discontinuation.
Medications and monitoring
There is no drug that heals a venous ulcer on its own; compression and elevation remain the core treatment. Topical corticosteroids may be prescribed short-term for surrounding venous eczema, and emollients help maintain skin integrity between flares. Oral antibiotics are reserved for confirmed clinical infection, not for a wound that is simply colonised or malodorous, since routine antibiotic use does not speed healing and drives resistance.
Monitor for pain, increasing exudate, spreading erythema, odour and fever, all of which suggest infection rather than expected wound drainage. Track wound dimensions and tissue type at each dressing change against the baseline measurements taken at assessment, and monitor limb circumference to gauge oedema response to compression over the following weeks.
When to escalate
Escalate for vascular referral if the ABI is borderline or low, if pulses are diminished or absent, or if the patient reports rest pain, since these all point toward mixed or arterial disease that changes the entire treatment plan. A wound that fails to reduce in size after several weeks of correctly applied compression also warrants specialist review rather than continued unchanged management.
Escalate urgently for signs of cellulitis, spreading erythema, fever, or sudden increase in pain, exudate or odour, which suggest infection requiring culture and antibiotics. Any suspicion of malignant change within a chronic ulcer, such as a wound that fails to heal over many months or develops an unusual raised or friable edge, should prompt biopsy referral.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our med-surg practice questions are the closest set to what this page covers.
One question from the med-surg set
A client with chronic obstructive pulmonary disease has an oxygen saturation of 88% on 2 L/min via nasal cannula and is alert with no distress. What should the nurse do first?
Rationale
In COPD a saturation of 88–92% is the therapeutic target, not an emergency, and this client is alert with no distress. The first action is the independent nursing intervention that is least invasive and most likely to help: sit them up and reassess. Turning the oxygen up to 6 L/min risks blunting the hypoxic drive, and calling rapid response or drawing an ABG escalates ahead of an assessment you have not finished.
Answer: B
Common questions
Why do you check the ABI before applying compression?
Compression works by supporting venous return, but it also restricts arterial inflow. If a leg already has reduced arterial supply, adding compression can push it into critical ischaemia. The ABI tells you whether the arterial circulation can tolerate that added pressure before you commit to a compression regimen.
What ABI result means compression is unsafe?
An ABI below roughly 0.5 to 0.6 generally means compression should not be applied, and a low-to-borderline result calls for vascular specialist input before any compression is used. Local protocols vary on exact cut-offs, so follow your facility's wound care pathway.
How do you tell a venous ulcer from an arterial one at the bedside?
Venous ulcers sit near the medial malleolus, are shallow with irregular borders and heavy exudate, and the pain eases with elevation. Arterial ulcers occur more distally, over pressure points or toes, look punched-out and pale, and the pain worsens with elevation and improves when the leg is dependent.
Can a venous leg ulcer heal without compression?
Healing is far less likely without compression, because it is the intervention that directly addresses the underlying venous hypertension. Dressings and skin care support the wound bed, but they do not correct the pressure problem driving the ulcer.
How long does compression therapy need to continue?
Compression continues until the ulcer has healed, and many patients then move to lifelong maintenance compression stockings to prevent recurrence, since the underlying venous insufficiency does not resolve. Recurrence rates are high when compression is stopped after healing.
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