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Soft Tissue Infiltration – Causes, Symptoms & Treatment

Soft tissue infiltration occurs when an infusion fluid or medication unintentionally leaks into surrounding tissue instead of entering the vein.

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Things worth knowing about "Soft Tissue Infiltration"

Soft tissue infiltration occurs when an infusion fluid or medication unintentionally leaks into surrounding tissue instead of entering the vein.

What is Soft Tissue Infiltration?

Soft tissue infiltration occurs when an intravenous (IV) infusion fluid or medication inadvertently leaks out of the vein and into the surrounding soft tissue. This typically happens when the IV cannula becomes dislodged or the vein wall is punctured. It is one of the most common complications associated with intravenous therapy in clinical settings.

Causes

Common causes of soft tissue infiltration include:

Dislodgement or misplacement of the IV cannula
Perforation of the vein wall due to mechanical pressure
Fragile or small veins, especially in elderly patients or children
Excessive movement of the affected limb during infusion
Inadequate securing of the IV access site
High infusion pressure or excessive flow rate

Symptoms

Symptoms of soft tissue infiltration can vary depending on the substance being infused. Common signs include:

Swelling and edema at or near the insertion site
Cool, pale, or tight skin in the affected area
Pain, burning sensation, or feeling of pressure
Slowed or stopped infusion flow
Redness or hardening of the surrounding tissue

When highly tissue-toxic substances (known as vesicants, such as certain chemotherapy agents) are involved, severe tissue damage and even necrosis can occur. This more serious form is referred to as extravasation.

Diagnosis

Diagnosis is primarily clinical. Nursing staff and physicians regularly inspect the IV site for early signs of infiltration. Diagnostic measures include:

Visual and manual inspection of the insertion site
Comparison of both limbs (e.g., measuring arm circumference)
Aspiration test: checking for blood backflow into the cannula
Ultrasound imaging of the affected tissue if the diagnosis is uncertain

Severity Grading

Infiltrations are often graded using standardized scales in clinical practice, such as the Infiltration Scale of the Infusion Nurses Society (INS), which classifies severity from 0 (no infiltration) to 4 (severe infiltration with risk of necrosis).

Treatment

Treatment depends on the severity and the type of substance infused:

Immediate action: Stop the infusion and remove the cannula
Elevation of the affected limb to promote lymphatic drainage
Application of cold (for non-vesicant substances) or warmth (for specific substances)
For vesicants: specific antidotes (e.g., hyaluronidase) or surgical intervention depending on the extent of damage
Close monitoring for signs of tissue necrosis or infection
Documentation and reporting as an adverse event if applicable

Prevention

The following measures are recommended to prevent soft tissue infiltration:

Careful selection and proper placement of the IV access site
Regular monitoring of the insertion site throughout the infusion
Use of appropriate cannula sizes and fixation materials
Training healthcare staff to recognize early signs of infiltration
Use of a central venous catheter (CVC) for high-risk substances

References

Infusion Nurses Society (INS) - Infusion Therapy Standards of Practice (2021). Journal of Infusion Nursing, 44(1S), S1-S224.
Dychter, S.S. et al. - Intravenous therapy: a review of complications and economic considerations of peripheral access. Journal of Infusion Nursing, 35(2), 84-91 (2012).
World Health Organization (WHO) - WHO Guidelines on the Use of Safety-Engineered Syringes for Intramuscular, Intradermal and Subcutaneous Injections in Health-Care Settings. WHO, Geneva (2016).

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