The controlled application of graded external pressure to a limb or tissue using bandages, multilayer systems or elastic garments to reduce interstitial fluid, support venous and lymphatic return, limit venous hypertension and thereby manage oedema and its local complications.

Principle

Externally applied, distal-to-proximal pressure gradients increase starling and lymphatic drainage efficiency and reduce venous pooling; the effect depends on magnitude, gradient, and tissue compliance.

Demonstration

Illustrative scenario → A patient with unilateral leg oedema after deep venous thrombosis: assessment documents limb circumference and ankle–brachial index; a trained clinician applies a multilayer bandage with greater distal pressure tapering proximally; over days limb circumference decreases and patient reports less heaviness, while circulation is monitored to avoid ischemia.

Misapplication

Assuming higher uniform pressure will always produce better oedema reduction; applying excessive pressure or eliminating the distal-to-proximal gradient; or using compression without evaluating arterial perfusion—these errors can produce skin breakdown or ischemia, especially in peripheral arterial disease.

Consequence

When correctly applied and monitored, compression reduces interstitial fluid volume and venous hypertension, facilitating wound healing and symptom relief; when misapplied it can cause skin injury, ischemic complications, or ineffective oedema control.

Reversal

The principle does not apply when arterial inflow is critically reduced (e.g., severe peripheral arterial disease) or when there is uncontrolled local infection or acute decompensated heart failure; in those conditions compression may be contraindicated or must be modified under specialist guidance.

Boundary

Clearly within: graduated multilayer bandaging or medical-grade compression garments for venous leg oedema and lymphedema. Boundary case: mild mixed (arterial + venous) disease where compression must be reduced and arterial status monitored. Clearly outside: simple elastic sleeves applied without gradient or pressure control, and pneumatic devices intended for intermittent prophylaxis rather than sustained graduated compression.

Semantic Tension

Compression must balance oedema reduction and venous support against preserving arterial perfusion and skin integrity; increasing pressure improves drainage but raises risk to arterial flow and tissue viability.

Synthesis

Compression Therapy is a mechanical, gradient-dependent intervention: its benefit arises from controlled redistribution of fluid and support of impaired venous/lymphatic return, not from generic tightness; safe, effective use therefore requires measurement, appropriate pressure gradation, and ongoing vascular and skin monitoring.