0.9% sodium chloride (normal saline) is the most frequently administered intravenous fluid in modern healthcare. In the United States, normal saline accounts for an estimated 70–80% of all crystalloid IV fluids used in hospitals, with over 200 million liters administered annually .1,2 Globally, normal saline remains the most commonly used crystalloid, representing approximately 60–70% of IV crystalloid use worldwide, across emergency care, perioperative medicine, critical care, pediatrics, oncology, and general medical wards .3,4
Despite being classified as a non‑vesicant and generally perceived as low risk, saline infiltration and extravasation are not harmless events and present their own potential risks. When unrecognized or detected late, isotonic fluids can produce tissue ischemia, nerve injury, compartment syndrome, infection, permanent functional impairment, and the need for surgical intervention.
For healthcare leaders, this represents both a patient safety obligation and a system level risk affecting quality metrics, length of stay, litigation exposure, and organizational reputation.
Normal saline is frequently delivered through peripheral IV catheters (PIVs) as continuous infusions lasting 12–24 hours or longer, as intermittent medication carriers, or as repeated flushes.
Peripheral IV infiltration is not an isolated nursing complication, but a high‑frequency risk inherent to routine care—often underrecognized due to the absence of chemical tissue toxicity. Normal saline is administered across virtually all hospital units, including NICU, pediatrics, ICU, surgical, oncology, and general wards. It is the most used crystalloid worldwide due to low cost, availability, and its isotonic properties.
Infiltration Incidence by Population
- Adults: Peripheral IV infiltration occurs in 13–20% of PIVs 2
- Pediatrics: Reported infiltration rates range from 32–46%5
- Neonates (NICU): Rates as high as 70%, driven by fragile vasculature and limited ability to communicate discomfort5,6
- High‑acuity units (ICU, oncology): Rates between 30–70%, influenced by sedation, immobility, pressurized infusions, and prolonged dwell times 5,6
Mechanism of Injury
While normal saline lacks vesicant properties, injury arises through volume‑mediated tissue compression, not chemical toxicity:
- Infiltrated saline increases interstitial pressure
- Rising pressure compromises capillary perfusion
- Resultant ischemia leads to tissue necrosis
- Nerve compression produces sensory or motor deficits
Large volume infiltrations can therefore produce injury patterns indistinguishable from vesicant extravasation.
Clinical Manifestations
Early Symptoms
- Localized swelling, tightness, discomfort
- Coolness or pallor related to reduced capillary refill due constricted/decreased blood flow
- Reduced infusion flow
- Pump pressure alarms
Progressive Complications
- Compartment syndrome due to rising tissue pressure, with documented cases requiring emergency fasciotomy4
- Nerve ischemia and compression, resulting in temporary or permanent sensory and motor deficits4,6
- Skin necrosis and tissue breakdown, occasionally necessitating surgical debridement 2,6
Severe and Long Term Outcomes
Although uncommon, severe outcomes are well documented in the literature:
- Loss of limb function or amputation secondary to untreated compartment syndrome4
- Secondary infection in compromised tissue planes 6
- Chronic pain, scarring, and functional impairment, particularly following delayed recognition 2,5
High Risk Populations
Certain patients are disproportionately vulnerable:
- Neonates and pediatric patients (fragile veins, non‑verbal)
- Sedated or mechanically ventilated ICU patients
- Older adults with reduced subcutaneous tissue integrity
- Oncology patients with venous fragility from repeated access and therapy
- Patients in lengthy operations, where IV site is under the sterile drapes and not checked for hours.
Why Traditional Monitoring Is Insufficient
Intermittent visual inspection:
- Often misses early pressure‑related changes
- Is unreliable in patients who are sedated, edematous, or immobilized
- Depends heavily on staffing ratios, lighting, and clinical experience
Root‑cause analyses consistently identify delayed detection, rather than incorrect insertion technique, as the leading contributor to severe injury.
Evidence Based Prevention Strategies
- Hourly site assessment using validated infiltration grading scales
- Avoidance of high‑risk insertion sites, particularly near joints
- Education of clinicians and families on early warning signs
- Continuous IV site monitoring for high‑risk populations
A 2023 BMJ Open study found that adding continuous IV site monitoring to standard assessment was associated with a substantial reduction in both the incidence and severity of infiltration injuries in neonatal patients.6
Leadership Call to Action
Saline infiltration is detectable, and preventable—and it can happen to any clinician on any shift. Even with excellent technique and vigilance, early signs can be subtle, patients may be unable to report symptoms, and workload pressures can delay recognition.
To support clinicians and protect patients, healthcare organizations should:
- Track peripheral IV infiltration and extravasation events by severity, focusing on learning and improvement—not performance blame
- Incorporate standardized infiltration grading into quality dashboards, so trends are identified before harm occurs
- Position IV site monitoring as a patient‑safety support tool, designed to assist clinicians during busy shifts, nights, and high‑acuity care— complimenting, not replacing current clinical practice
Harm from saline infiltration is not a failure of individual clinicians. It is a systems vulnerability that requires systems‑level support, so clinicians can deliver safe care with confidence, even under real‑world conditions.
- StatPearls. Intravenous Fluids: Crystalloids and Colloids. National Center for Biotechnology Information.
https://www.ncbi.nlm.nih.gov/books/NBK539863/ - Helm RE, Klausner JD, Klemperer JD, Flint LM, Huang E. Accepted but unacceptable: peripheral IV catheter failure. Journal of Infusion Nursing. 2015;38(3):189–203.
https://pubmed.ncbi.nlm.nih.gov/25724368/ - StatPearls. Normal Saline. National Center for Biotechnology Information.
https://www.ncbi.nlm.nih.gov/books/NBK545210/ - Huang DT, Murugan R. Is normal saline solution an acceptable choice of fluid for stable patients? Annals of Emergency Medicine. 2019;73(2):170–171.
- Cleveland Clinic Journal of Medicine. Peripheral intravenous catheter complications. CCJM. 2023;90(10):665–672.
https://www.ccjm.org/content/90/10/665 - BMJ Open. Continuous IV site monitoring in pediatric populations. 2023;13:e064372.