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.
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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