IV Therapy Complications
What Healthcare Professionals Should Know
Understanding risks, recognizing early warning signs, and managing complications in intravenous therapy practice.
Intravenous therapy is one of the most widely used methods of administering fluids, medications, nutrients and other treatments in healthcare. Although IV access is routine in many clinical environments, it is not risk-free.
For healthcare professionals, safe IV therapy involves much more than successfully placing a catheter or starting an infusion. Practitioners must be able to recognize early signs of complications, understand the factors that increase risk, monitor patients appropriately and respond according to clinical protocols and their professional scope of practice.
Common IV therapy complications include infiltration, extravasation, phlebitis, catheter occlusion, infection, hematoma, catheter dislodgement and adverse reactions to infused substances.
Large-Scale Evidence on IV Complications
Phlebitis rate in peripheral IV catheters (defined diagnostic standard)
Systematic review & meta-analysis of 76,977 peripheral IV catheters
A systematic review and meta-analysis examining 76,977 peripheral intravenous catheters found that complications remain common. Reported pooled rates included approximately:
- 19.3% phlebitis (with defined diagnostic standard)
- 13.7% infiltration or extravasation
- 8% occlusion
- 7.3% leakage
- 6.4% pain
- 6% catheter dislodgement
For clinicians providing IV therapy, these findings reinforce an important principle: successful IV therapy depends on prevention, monitoring and early complication recognition—not simply catheter insertion.
In This Guide
The 9 Most Common IV Therapy Complications
Peripheral IV therapy complications can generally be divided into several categories. Some complications primarily affect the catheter site, while others may involve the patient's systemic response to the infusion. The severity also varies considerably. A minor infiltration may resolve without long-term consequences, whereas extravasation of a tissue-damaging substance, severe infection or a significant systemic reaction can require urgent medical intervention.
Infiltration
Infiltration occurs when a non-vesicant IV solution unintentionally enters the surrounding tissue instead of remaining within the vein. It may occur if the catheter becomes displaced, passes through the vessel wall or no longer sits correctly within the vein.
Common Findings:
- Swelling around the IV site
- Coolness of the surrounding skin
- Discomfort or tenderness
- Slowing or interruption of the infusion
- Leakage near the insertion site
- Changes in skin appearance
The significance of infiltration depends on the amount and type of fluid involved and the patient's underlying clinical condition. Infiltration should not simply be considered an inconvenience—it represents loss of reliable vascular access and may interrupt treatment.
Extravasation
Extravasation is related to infiltration, but the terms should not be used interchangeably. Infiltration generally refers to unintended leakage of a non-vesicant fluid, whereas extravasation refers to leakage of a substance capable of causing tissue injury.
Possible Signs:
- Pain or burning
- Swelling
- Erythema
- Blistering
- Changes in skin color
- Reduced infusion flow
- Tissue changes around the catheter site
This distinction is clinically important because certain medications or solutions may cause significant local damage if they escape the vein. The appropriate response depends heavily on the substance involved. Healthcare professionals should follow institutional protocol, medication-specific recommendations and escalation pathway rather than relying on a single management approach for every extravasation event.
Infiltration vs. Extravasation
| Infiltration | Extravasation |
|---|---|
| Fluid leaks into surrounding tissue | A potentially tissue-damaging substance leaks into surrounding tissue |
| Usually involves a non-vesicant solution | Involves a vesicant or otherwise harmful substance |
| Severity varies with volume and patient factors | May result in more significant tissue injury |
| Requires recognition and appropriate management | Often requires substance-specific management and escalation |
Phlebitis
Phlebitis refers to inflammation of a vein. Peripheral IV catheters can contribute to phlebitis through mechanical irritation, chemical irritation or other factors.
Clinical Findings:
- Pain or tenderness
- Redness
- Warmth
- Swelling
- A palpable or hardened vein
- Discomfort along the course of the vessel
The CDC has historically advised that peripheral venous catheters should be removed when patients develop signs of phlebitis such as warmth, tenderness, erythema or a palpable venous cord, as well as when infection or catheter malfunction is present. Risk may be influenced by catheter characteristics, insertion site, solution properties, catheter movement and duration of use.
IV Catheter Occlusion
Occlusion occurs when an IV catheter no longer permits normal infusion or aspiration.
Potential Contributors:
- Mechanical obstruction
- Catheter kinking
- Catheter positioning
- Clot formation
- Precipitation or incompatibility
- Compression around the catheter
An occluded catheter should not automatically be treated as something that simply needs to be "forced open." The practitioner must first understand why the catheter is not functioning and follow the relevant clinical protocol. In the systematic review of peripheral catheter complications, occlusion occurred in approximately 8% of catheters included in the pooled analysis.
IV-Related Infection
Any procedure that breaches the skin creates an opportunity for microorganisms to enter tissues or the bloodstream. Peripheral IV catheters generally have a lower bloodstream infection risk than many central venous devices, but infection remains an important clinical consideration.
Potential Warning Signs:
- Redness
- Increasing tenderness
- Warmth
- Swelling
- Drainage
- Fever or systemic symptoms without another clear explanation
Catheter-related infections can range from localized site infections to more serious bloodstream infections. Infection prevention therefore begins before the catheter is inserted. Important principles include appropriate hand hygiene, aseptic technique, skin preparation, appropriate catheter-site care, minimizing unnecessary manipulation and ongoing inspection of the access site.
Hematoma and Bleeding
A hematoma can form when blood escapes from the vessel into surrounding tissue during or after venipuncture.
Possible Contributing Factors:
- Vessel injury during insertion
- Multiple insertion attempts
- Inadequate pressure after catheter removal
- Anticoagulant use
- Fragile vessels
- Patient-specific bleeding risks
Minor bruising may be self-limited, but significant swelling, persistent bleeding or unusual pain requires appropriate clinical assessment. A patient's medication history and bleeding risk should therefore be considered before and during IV therapy.
Catheter Dislodgement and Leakage
Peripheral IV catheters can move from their original position, leading to complications.
Consequences of Dislodgement:
- Infiltration
- Leakage
- Loss of vascular access
- Interruption of therapy
- Patient discomfort
- Need for catheter replacement
In the systematic review by Marsh and colleagues, pooled catheter dislodgement was estimated at approximately 6% and leakage at approximately 7.3%. Securement and routine site assessment are therefore important parts of peripheral IV management.
Adverse Reactions During IV Therapy
Not every complication originates from the catheter itself. Patients may react to a medication, nutrient, fluid or other substance administered intravenously.
Possible Symptoms:
- Flushing
- Nausea
- Dizziness
- Rash
- Itching
- Changes in blood pressure
- Respiratory symptoms
- Cardiovascular symptoms
- Other systemic reactions
Some reactions may be mild, while others can become medical emergencies. This is why patient assessment before treatment and monitoring during an infusion are essential. IV therapy should not be reduced to selecting an infusion formula and connecting it to a patient.
Fluid-Related Complications
Intravenous fluids can also create risk when the amount, composition or rate of administration is inappropriate for the individual patient.
This is particularly important for patients with conditions affecting fluid balance, cardiovascular function or renal function. A patient's ability to tolerate intravenous fluid cannot be assumed simply because an infusion is commonly used.
Important for Wellness Professionals: For professionals working in wellness or medical aesthetic environments, this point is particularly important. The commercial popularity of hydration therapy does not remove the need for medical assessment.
What Causes IV Therapy Complications?
IV complications rarely have only one cause. Risk may arise from a combination of patient factors, catheter factors, infusion factors, and technique/process factors.
- Difficult venous access
- Fragile veins
- Advanced age
- Chronic diseases
- Impaired circulation
- Previous vascular history
- Medication use
- Fluid-balance disorders
- Allergy history
- Catheter size
- Catheter type
- Insertion location
- Securement
- Movement
- Duration of use
- Insertion technique
- Hand hygiene
- Skin preparation
- Failure to reassess
- Poor stabilization
- Inadequate monitoring
- Failure to recognize symptoms
This is one reason IV therapy training should address complete clinical systems rather than simply teaching venipuncture.
Infusion Factors
The infused substance itself matters. Important considerations can include:
- pH
- Osmolality
- Concentration
- Rate of infusion
- Medication compatibility
- Vesicant or irritant properties
Clinical Framework: Assessment, Monitoring & Prevention
Why Patient Assessment Matters Before IV Therapy
Many complications can be reduced when appropriate risks are identified before treatment begins. A structured patient assessment may consider:
- Relevant medical history
- Current medications and supplements
- Allergies
- Previous infusion reactions
- Cardiovascular history
- Renal function where relevant
- Current symptoms
- Treatment indication
- Relevant laboratory results when indicated
- Hydration and fluid status
- Contraindications to the proposed therapy
Important: The exact assessment required depends on what is being administered and the clinical setting. A hydration infusion and an IV medication are not identical interventions, and the same screening process should not automatically be applied to every therapy.
Monitoring During IV Therapy
IV monitoring should include both the patient and the vascular access site. Practitioners should remain alert to changes such as:
- New pain
- Swelling
- Redness
- Leakage
- Changes in infusion flow
- Burning or discomfort
- Rash
- Dizziness
- Respiratory changes
- Cardiovascular symptoms
- Other unexpected patient complaints
Can IV Therapy Complications Be Prevented?
Not every complication is preventable. However, risk can often be reduced through systematic clinical practice.
Key Prevention Principles:
- Appropriate Patient Selection: Confirm that the treatment is suitable for the patient and the clinical indication.
- Proper Vascular Access Selection: Select an appropriate device, vein and insertion location for the intended therapy.
- Aseptic Technique: Follow current infection-prevention practices during insertion, access and maintenance.
- Secure Catheter Placement: Minimize unnecessary catheter movement.
- Evaluate the Infusion Itself: Understand the characteristics, compatibility and risks of administered substances.
- Monitor Continuously: Reassess the patient and the IV site throughout treatment.
- Respond Early: Small changes can be clinically important. Do not wait for a complication to become severe before reassessing the infusion.
- Document Appropriately: Document assessment findings, treatment information, complications and actions taken according to applicable standards.
- Maintain Emergency Readiness: Clinics providing IV treatments should have appropriate protocols, equipment and escalation processes for adverse events.
Why Complication Management Matters in IV Therapy Training
A course that focuses only on infusion recipes or catheter placement provides an incomplete view of IV practice. Healthcare professionals should understand:
- Why complications occur
- Which patients may be at higher risk
- How to identify early warning signs
- How infiltration differs from extravasation
- How to recognize phlebitis
- How to identify catheter dysfunction
- How to monitor patients during treatment
- How infection-prevention principles apply
- When a treatment should be stopped or reassessed
- When escalation is required
- How to document an adverse event
These competencies are especially important as IV hydration and nutrient-based therapies expand beyond hospitals into medical clinics, wellness practices and aesthetic medicine environments.
Key Takeaways
IV therapy is widely used, but routine use should never lead to complacency.
The most important complications healthcare professionals should understand include infiltration, extravasation, phlebitis, catheter occlusion, infection, hematoma and bleeding, catheter dislodgement, adverse infusion reactions, and fluid-related complications.
Evidence demonstrates that peripheral IV catheter complications are not rare. In a large systematic review covering more than 76,000 catheters, phlebitis and infiltration/extravasation were among the most frequently reported complications.
The safest approach is therefore not simply learning how to initiate IV therapy. It is developing the clinical judgment required to assess patients, select appropriate treatment, monitor vascular access, identify complications early and respond appropriately.
For healthcare professionals, complication recognition should be considered a core competency of IV therapy practice.
Frequently Asked Questions
Phlebitis and infiltration/extravasation are among the most frequently reported peripheral IV catheter complications. A systematic review involving 76,977 catheters found pooled rates of approximately 19.3% for defined phlebitis and 13.7% for infiltration/extravasation.
Infiltration generally occurs when a non-vesicant solution leaks from the vein into surrounding tissue. Extravasation involves leakage of a substance capable of causing tissue damage and may require more urgent, substance-specific management.
Possible signs include swelling, coolness, discomfort, leakage and changes in infusion flow around the catheter site.
Phlebitis may present with tenderness, warmth, erythema, swelling or a palpable vein. CDC guidance recommends removal of peripheral venous catheters when signs of phlebitis, infection or catheter malfunction occur.
Yes. Although bloodstream infection associated with peripheral catheters is relatively uncommon compared with some central venous devices, local and systemic infections remain clinically important because peripheral IV catheters are used very frequently.
Yes. Patients can experience adverse or hypersensitivity reactions to substances administered intravenously. The risk depends on the substance and the patient. Appropriate pre-treatment assessment and monitoring are therefore essential.
Risk reduction involves appropriate patient assessment, proper catheter selection and insertion, aseptic technique, catheter-site monitoring, understanding the infused substance, early recognition of problems and appropriate clinical response.
New or increasing pain should not automatically be considered normal. Pain can be associated with catheter movement, irritation, infiltration, phlebitis, extravasation or other complications and should prompt clinical reassessment.
References
Marsh N, Webster J, Ullman AJ, Mihala G, Cooke M, Chopra V, Rickard CM. Peripheral intravenous catheter non-infectious complications in adults: a systematic review and meta-analysis. Journal of Advanced Nursing. PMID: 33016412.
Webster J, Osborne S, Rickard CM, Marsh N. Clinically-indicated replacement versus routine replacement of peripheral venous catheters. Cochrane Database of Systematic Reviews.
Centers for Disease Control and Prevention. Guidelines for the Prevention of Intravascular Catheter-Related Infections.
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