“Compression therapy is one of the most effective treatments in vascular medicine — and one of the most dangerous when applied to the wrong patient. The key is always to assess first.”
By Dr. Rahul Agarwal | Consultant Vascular & Endovascular Surgeon, CARE Hospitals, Banjara Hills, Hyderabad
Compression therapy — the application of external graduated pressure to the leg — is the cornerstone of venous ulcer treatment. Used correctly, it heals the majority of venous leg ulcers within 12–24 weeks. Used incorrectly — particularly in a patient with arterial disease — it can cause severe tissue damage and even limb loss.
🩹 How Compression Therapy Works
Venous ulcers result from chronic venous hypertension: incompetent vein valves or post-thrombotic damage allow blood to pool in the lower leg, increasing capillary pressure, causing leakage, inflammation, and ultimately skin breakdown. Compression therapy works by:
- Reducing venous pressure in the lower leg by externally compressing the superficial venous system
- Improving venous return toward the heart with every step (calf muscle pump augmentation)
- Reducing oedema and interstitial fluid that impairs tissue oxygen delivery
- Reducing fibrin deposition around capillaries that creates the “cuff” blocking oxygen diffusion
🧶 Types of Compression Therapy
Multi-Layer Compression Bandaging
The gold standard for active venous ulcer treatment. Four-layer bandaging (or two-layer high-compression equivalent) applies 35–40 mmHg at the ankle, graduating to lower pressure at the knee. Applied by trained nurses, changed weekly. Healing rates of 70–75% at 12 weeks in uncomplicated venous ulcers.
Compression Stockings
For maintenance once the ulcer has healed, and for prevention of recurrence. Class 2 (23–32 mmHg) or Class 3 (34–46 mmHg) depending on venous disease severity. Must be worn daily and replaced every 3–6 months as they lose elasticity.
Pneumatic Compression Devices
Intermittent pneumatic compression (IPC) devices — inflatable sleeves worn on the leg — simulate the calf muscle pump. Used for patients unable to ambulate, or as adjunct therapy. Also used for lymphoedema management.
⚠️ When Compression Is Dangerous: Absolute Contraindications
This is the most important section of this article. Compression therapy applied to a limb with inadequate arterial supply can cause catastrophic tissue death.
- ABI below 0.5: Severe arterial disease — full compression absolutely contraindicated; even light compression may be harmful
- ABI 0.5–0.8: Moderate arterial disease — compression contraindicated or only applied with extreme caution and specialist oversight; reduced compression (below 20 mmHg) may be appropriate
- ABI above 0.8: Compression generally safe
- Acute DVT: Compression not used acutely until anticoagulation established
- Uncontrolled heart failure: Moving large volumes of fluid from legs to central circulation can precipitate pulmonary oedema
The rule: always measure ABI before applying compression to any leg wound. This takes 10 minutes and is non-negotiable.
❓ Frequently Asked Questions
My nurse applied compression and my pain got much worse. What should I do?
Remove or loosen the bandage immediately and seek medical review the same day. Worsening pain under compression suggests arterial compromise. The ABI needs to be measured urgently before any further compression is applied. Do not reapply until arterial status is confirmed adequate.
How long do I need to wear compression stockings after my ulcer heals?
Indefinitely, in most cases. Venous insufficiency is a chronic condition. Without compression, venous hypertension recurs and ulcer recurrence rates reach 40–60% within 5 years. Daily compression stocking wear is the most effective single intervention to prevent recurrence.
🔑 Key Insights: Compression therapy is highly effective for venous ulcers — healing 70–75% within 12 weeks. It works by reducing venous pressure, improving venous return, and reducing oedema. ABI below 0.8 means arterial disease is present and compression is dangerous without specialist input. ABI below 0.5 is an absolute contraindication. Always check ABI before applying compression to any lower limb wound.
📚 Related Reading
- Varicose Veins & Venous Disease
- Venous vs Arterial vs Diabetic Ulcer: How to Tell the Difference
- Why Some Wounds Don’t Heal
👨⚕️ About the Author
Dr. Rahul Agarwal is a Consultant Vascular & Endovascular Surgeon at CARE Hospitals, Banjara Hills, Hyderabad. He manages venous insufficiency, venous ulcers, and varicose veins, and works with wound care teams to ensure compression therapy is applied safely and effectively.
Medical Disclaimer: This article is intended for general patient education only and does not constitute individualised medical advice. Always consult a qualified medical professional for diagnosis and treatment specific to your condition.