Compression Therapy in Wound Care: Selection Guide

Compression Therapy in Wound Care: Getting the Selection Right

Compression therapy wound care is the single most important intervention for venous leg ulcers, and the intervention most frequently performed inadequately. Venous leg ulcers account for approximately 70-80% of all lower-extremity ulcers, and the underlying pathology — venous insufficiency with sustained ambulatory venous hypertension — cannot be corrected with dressings alone. Without compression, venous ulcers do not heal. With compression, healing rates of 65-75% at 24 weeks are achievable. The difference is not marginal — it is the difference between chronic wound management and wound closure.

This guide covers compression level selection, system comparisons, contraindications, pre-compression vascular assessment, and the patient education strategies that determine whether compression actually gets worn.

Compression Levels by Clinical Indication

Compression is classified by the amount of pressure delivered at the ankle, measured in millimeters of mercury (mmHg). The correct level depends on the clinical indication and the patient's arterial status.

Light Compression (15-20 mmHg)

Indications: Mild edema, early chronic venous insufficiency without ulceration, post-treatment maintenance, pregnant patients with varicosities
Typical devices: Over-the-counter compression stockings
Clinical role in wound care: Post-healing maintenance for patients who have completed active treatment and have closed ulcers. Not adequate for active venous ulcers.

Moderate Compression (20-30 mmHg)

Indications: Moderate edema, chronic venous insufficiency with skin changes (lipodermatosclerosis, hemosiderin staining) but no active ulceration, post-DVT syndrome, mild lymphedema
Typical devices: Prescription compression stockings, single-layer wraps
Clinical role in wound care: Transition compression for patients stepping down from therapeutic compression after ulcer closure. May be appropriate for very shallow, low-exudate venous ulcers in patients who cannot tolerate higher compression.

Therapeutic Compression (30-40 mmHg)

Indications: Active venous leg ulcers, moderate to severe chronic venous insufficiency, moderate lymphedema, post-venous procedure support
Typical devices: Multi-layer compression bandage systems, adjustable compression wraps, strong compression stockings
Clinical role in wound care: The therapeutic target for most active venous leg ulcers. This is the compression level that drives venous ulcer healing.

High Compression (40-50+ mmHg)

Indications: Severe lymphedema, refractory venous ulcers not responding to 30-40 mmHg compression, post-lymphedema decongestive therapy maintenance
Typical devices: Short-stretch bandage systems, multi-layer high-compression systems, pneumatic compression devices
Clinical role in wound care: Reserved for patients with severe venous or lymphatic disease who have not responded to standard therapeutic compression and who have confirmed adequate arterial perfusion.

ABI Assessment Before Compression

Why This Step Is Non-Negotiable

Applying compression to a limb with significant arterial insufficiency can cause tissue ischemia and limb-threatening injury. The ankle-brachial index (ABI) is the screening test that identifies patients who cannot safely receive standard compression.

How to Interpret ABI for Compression Decisions

ABI > 0.8: Safe for full therapeutic compression (30-40 mmHg). Proceed with compression therapy.
ABI 0.5-0.8: Reduced compression only (15-23 mmHg) under clinical supervision. The limb has mixed arterial-venous disease. Consider referral to vascular surgery before initiating compression.
ABI < 0.5: Compression is contraindicated. The limb has significant arterial insufficiency. Refer to vascular surgery for revascularization assessment before any compression is applied.
ABI > 1.3: Non-compressible (calcified) vessels — the ABI is falsely elevated and unreliable. Use toe pressures or TcPO2 for vascular assessment instead. This is common in diabetic patients and patients with renal disease.

When to Reassess ABI

At initial evaluation before starting compression
If the patient develops new symptoms suggesting arterial insufficiency (claudication, rest pain, color changes)
Annually for patients on long-term compression therapy
After any vascular intervention

For patients with venous leg ulcers, comprehensive compression therapy for venous ulcers including the FAQ on common clinical questions provides additional guidance.

Multi-Layer vs Single-Layer Compression Systems

Multi-Layer Bandage Systems

Multi-layer compression bandages (e.g., Profore, Coban 2, Dyna-Flex) deliver sustained therapeutic compression through multiple components that work together:

Orthopaedic wool/padding layer — redistributes pressure over bony prominences and absorbs exudate
Crepe/conforming layer — smooths the padding and adds light compression
Compression layer(s) — elastic and/or cohesive bandages that deliver the target pressure
Cohesive outer layer — holds the system together and provides additional compression

Advantages:

Delivers consistent graduated compression regardless of patient activity level
Accommodates wound dressings underneath
Can be left in place for up to 7 days between visits
Graduated compression (higher at ankle, decreasing toward knee) is built into the application technique

Disadvantages:

Requires trained clinician for application — improper technique can deliver inadequate or dangerous compression
Bulky — limits footwear options and patient mobility
Not reusable — each application requires new components
Application takes 10-15 minutes per limb

Adjustable Compression Wraps

Adjustable compression wraps (e.g., CircAid, FarrowWrap, Juzo) use inelastic or semi-elastic material with hook-and-loop closures that the patient adjusts throughout the day.

Advantages:

Patient can reapply and adjust compression independently between visits
Easier for patients to manage for hygiene and wound inspection
Reusable — lower long-term supply cost
Can be donned over wound dressings

Disadvantages:

Requires patient education and adequate hand dexterity to apply correctly
Compression level depends on how tightly the patient fastens the wrap — inconsistent if the patient does not understand the correct tension
May not deliver as consistent graduated compression as multi-layer systems

Compression Stockings

Compression stockings are primarily maintenance devices used after ulcer closure to prevent recurrence. They are not well-suited for managing active ulcers with significant exudate because they are difficult to apply over wound dressings and do not accommodate dressing bulk.

Post-healing protocol: Once a venous ulcer has closed, transition the patient to knee-high compression stockings at 30-40 mmHg for life. The patient needs at least two pairs — one to wear while the other is laundered. Replace stockings every 3-6 months as the elastic degrades with washing.

Patient Education for Compression Adherence

The Adherence Problem

Compression therapy works only when worn consistently. Studies show that 30-65% of patients with venous leg ulcers do not wear their compression as prescribed. The result is predictable: non-adherent patients have healing rates indistinguishable from untreated patients.

What to Communicate to Patients

Frame the conversation around the mechanism, not the instruction:

"Your wound exists because gravity is pulling blood into your legs faster than your veins can push it back up." — this explains why elevation and compression both help, and why the wound returns when compression stops.
"Compression does more healing work than the dressing underneath it." — patients often focus on the wound dressing and undervalue compression.
"After the wound heals, you will wear lighter compression stockings for life." — set the expectation early that compression is permanent management, not temporary treatment.

Common Barriers and Solutions

"It's too tight / uncomfortable" — ensure the correct compression level is prescribed (not all patients need 30-40 mmHg). Check ABI — discomfort may indicate unrecognized arterial disease. Ensure padding layer is adequate over bony prominences.
"I can't put it on myself" — teach the patient or caregiver application technique. For stockings, provide a stocking donner device. Consider adjustable wraps that are easier to self-apply.
"It's too hot" — this is a compliance issue, not a clinical contraindication. Acknowledge the discomfort and reinforce the clinical necessity.
"My skin itches underneath" — moisturize the skin before applying compression. Use a skin-protective barrier. Itching may also indicate dermatitis requiring treatment.

For deeper guidance on the relationship between compression therapy and CPT billing codes, see the complete wound care coding reference.

Key Takeaways

ABI assessment before compression is non-negotiable — compression on a limb with ABI < 0.5 risks ischemia; ABI 0.5-0.8 allows only reduced compression under supervision.
Therapeutic compression at 30-40 mmHg is the target for active venous leg ulcers and is the compression level that drives healing in the clinical evidence.
Multi-layer bandage systems deliver the most consistent graduated compression but require trained clinician application; adjustable wraps offer patient independence at the cost of consistency.
Post-healing compression stockings (30-40 mmHg) for life are essential to prevent recurrence — without maintenance compression, venous ulcer recurrence rates exceed 70% within one year.
Patient adherence determines outcomes — educate patients on the mechanism (venous hypertension), address barriers proactively (fit, discomfort, dexterity), and set the expectation that compression is lifelong management.