What Happens If an IV Is Put in Wrong?

A misplaced or poorly secured IV can trigger problems ranging from a painful swollen arm to, in rare cases, tissue death or bloodstream infection. The most common issue is infiltration, where fluid leaks out of the vein and pools in surrounding tissue, but the spectrum of complications extends to vein inflammation, nerve injury, accidental injection into an artery, and even fragments of a broken catheter traveling toward the lungs. What actually happens depends on where the catheter ends up, what fluid is being infused, and how quickly the problem is caught.

Infiltration and Why It Is the Most Common Problem

Infiltration occurs when the IV catheter tip slips out of the vein, or punctures through the vein wall, and the fluid being infused drains into the soft tissue around it instead of flowing through the bloodstream. You might notice swelling, coolness, and tightness at the IV site, and the skin sometimes looks pale or puffy. With ordinary saline or balanced fluids, mild infiltration often resolves on its own once the IV is removed and the area is elevated. But the consequences scale with volume and substance. A large-volume infiltration can build pressure inside a tissue compartment, and in extreme cases that pressure becomes a surgical emergency.

A review of infiltration injuries found that about 9% led to a superficial soft tissue infection, roughly 3% caused tissue death or hard scabbing, and about 2% resulted in a full-thickness wound. Long-term defects occurred in around 5% of cases, though none involved permanent loss of hand or arm function.¹ Those numbers offer some reassurance, but the picture changes when the fluid leaking out isn’t a benign saline solution.

Extravasation With Harmful Drugs

Extravasation is the term used when the substance leaking into tissue is something inherently damaging, like certain chemotherapy agents, strong electrolytes (calcium, potassium), or vasopressors. The consequences can be far worse than a swollen arm. Vesicant chemotherapy drugs, for example, are capable of destroying tissue on contact. If the leak goes unnoticed, the damage can progress to tissue necrosis, disfigurement, and permanent impairment of the affected limb.² In the broadest terms, outcomes from infiltration and extravasation range from mild local irritation all the way to amputation.³

Treatment depends on the drug involved. For some agents, the antidote hyaluronidase is injected under the skin around the leak site to help the body disperse and absorb the escaped fluid faster. In one reported case of a large paclitaxel extravasation, subcutaneous hyaluronidase plus dry warm compresses resolved the patient’s skin symptoms within days, with only mild discomfort during treatment.⁴ For other vesicant drugs, cold compresses or specific antidotes like dexrazoxane are the standard. The key variable is time: the faster extravasation is recognized and the IV is stopped, the less tissue damage occurs.

Compartment Syndrome From Fluid Buildup

The most feared mechanical complication of infiltration is acute compartment syndrome, where leaked fluid accumulates enough volume and pressure inside a fascial compartment of the hand or forearm that blood flow to the muscles and nerves is choked off. This is a surgical emergency. If the pressure isn’t relieved quickly with fasciotomies (incisions to open the compartment), permanent muscle death and nerve damage can follow.⁵

A systematic review of IV-infiltration cases that escalated to compartment syndrome found that nearly half involved the hand or forearm, and most were caused by IV contrast or fluids delivered through pressurized systems.⁶ Pressurized infusions push fluid out faster once the catheter migrates, which is why power-injected contrast during CT scans carries a higher risk than a gravity drip. Patients who are sedated, very young, or unable to report pain are at particular risk because the early warning signs go unnoticed.

Vein Inflammation

Phlebitis, or inflammation of the vein wall, is one of the most frequent complications of any peripheral IV, whether or not it was placed perfectly. The vein becomes red, warm, tender, and sometimes swollen along its course. A misplaced or poorly secured catheter makes phlebitis more likely because the catheter tip irritates the vein wall with every small movement. Computational modeling shows that catheter placement near the vessel edge, rather than centrally within the vein, creates a stagnant recirculation zone of slow-moving blood behind the catheter tip. That zone produces abnormally low shear stress on the vessel wall, which is associated with inflammation and clot formation.⁷

How long the catheter stays in place matters a great deal. One prospective study found that catheters left in for 72 hours or longer were significantly more likely to cause phlebitis, and that forearm placement was associated with phlebitis that developed after the catheter was removed. Certain antibiotics, particularly oxacillin, clarithromycin, and ceftriaxone, also showed a link to post-infusion vein inflammation.⁸ Phlebitis usually resolves with removal of the catheter and warm compresses, but occasionally it progresses to suppurative (infected) phlebitis, which requires antibiotics and sometimes surgical drainage.

Accidental Arterial Injection

Arteries sometimes run close to veins, and in rare cases a catheter intended for a vein ends up in an artery instead. The consequences are immediate and dramatic. Patients often feel intense pain within seconds of the injection, followed by tingling, burning, and visible skin changes like mottling or blanching in the hand and fingers. Over the following days, further vascular compromise can develop: pulselessness, bluish discoloration, and numbness. If the blood supply is severely compromised, compartment syndrome, tissue necrosis, gangrene, and permanent loss of function can follow within a week or two.⁹

The severity depends heavily on what drug is pushed into the artery. Many medications are formulated with a pH or particle size that is tolerable in the venous system but devastating when delivered into a smaller, higher-pressure arterial network. The result is vasospasm, endothelial damage, and clotting that can propagate distally. Accidental arterial cannulation is most likely at sites where arteries sit superficially, such as the wrist near the radial artery, or the antecubital fossa where the brachial artery passes close to common venipuncture veins.

Nerve Damage

Peripheral nerves travel in close proximity to veins throughout the arm and hand, and a needle or catheter can nick or penetrate a nerve during insertion. When this happens, the patient typically feels a sharp, electric-shock-like pain shooting down the arm or into the fingers. The damage may be temporary, resolving over weeks, or in some cases it becomes permanent.¹⁰

Direct puncture isn’t the only route to nerve injury. Nerve compression can develop secondary to a large infiltration or a hematoma at the puncture site. When fluid or blood collects in a confined space around a nerve, the sustained pressure damages nerve fibers even without direct contact. Hematomas are especially likely when inadequate pressure is applied after a failed stick or when an arterial puncture site isn’t held properly.¹¹ Warning signs include persistent numbness, tingling, weakness, or pain that continues well after the catheter is removed. Anyone experiencing these symptoms should report them, because early recognition allows for splinting, physical therapy, and in some cases surgical exploration before permanent damage sets in.

Bloodstream Infection

An IV catheter is essentially an open highway from the outside world into the bloodstream, and bacteria can travel along it. The risk is much lower with a peripheral IV than with a central line, but it is not zero. A large meta-synthesis pooling data from over 14,600 peripheral catheters found a bloodstream infection rate of about 0.04% per catheter, or roughly 0.12 infections per 1,000 catheter-days.¹² Those are small numbers, but in hospitals placing millions of IVs a year, even a tiny percentage translates to real cases.

Dwell time is a consistent risk factor. One study found that 80% of peripheral-IV bloodstream infections occurred after the catheter had been in place more than four days, with Staphylococcus aureus responsible for a fifth of those late infections.¹³ Patients at higher risk included men over 60 with difficult vein access, people with cancer, and those who had catheters left in place despite signs of trouble at the insertion site.¹² A separate retrospective cohort studying emergency-department admissions found that about 0.25% of patients who received an IV and were subsequently hospitalized developed a catheter-related bloodstream infection.¹⁴

Rare Complications That Sound Alarming

Two uncommon but attention-grabbing complications deserve a mention: air embolism and catheter fracture.

An air embolism occurs when air enters the bloodstream through the IV line. With peripheral IVs, this is uncommon because the volumes of air that sneak in during a normal line change or tubing disconnect are usually too small to cause problems. The body absorbs trace amounts of venous air without incident. It takes a significant bolus of air, or air entering a central vein near the heart, to produce symptoms like sudden chest pain, shortness of breath, or cardiovascular collapse. Case reports of symptomatic air embolism from peripheral IVs exist but are rare and often involve unusual circumstances like a disconnected line left open at or above heart level.¹⁵

Catheter shearing is another rare event. It happens when the plastic catheter is pulled back over the metal needle during insertion, or when excessive force is applied, causing the catheter to snap. A fragment left inside a vein can migrate through the venous system toward the heart or lungs, creating a risk of pulmonary embolism. When a broken piece is identified, it typically needs to be retrieved, often through a minimally invasive catheter-based procedure.¹⁶

Who Faces a Higher Risk of Problems

Not everyone’s veins cooperate equally. The first IV attempt fails in roughly 12 to 26% of adults and 24 to 54% of children.¹⁷ Factors that make insertion harder include obesity, dehydration, chronic illness that degrades vein quality (such as diabetes, kidney disease, or prolonged chemotherapy), dark skin that makes veins harder to see, and extremes of age. Infants and elderly patients have small, fragile veins that puncture through more easily. Difficult access means more needle sticks, and each failed attempt raises the risk of hematoma, nerve injury, and patient distress.

When peripheral access fails repeatedly, clinicians may escalate to more invasive options like a central venous catheter or intraosseous access, both of which carry their own distinct risk profiles, including higher infection rates and procedural complications.¹⁸ The irony is that the patients most likely to need an IV urgently are often the same ones in whom it is hardest to place.

How Ultrasound Guidance Changes the Equation

One of the clearest advances in reducing IV complications is ultrasound-guided insertion. Instead of relying on landmarks and touch alone, a clinician uses a handheld probe to see the vein in real time and watch the needle enter it. For patients with difficult veins, the difference is significant. One emergency-department study found that ultrasound-guided insertion raised the first-attempt success rate from about 51% to 84%, cut the average time to get the line in by nearly half, and reduced the overall complication rate from around 16% to about 6%.¹⁹ A meta-analysis of eight studies reported even more striking reductions in vascular injury and hematoma formation during the puncture itself.²⁰

There is a nuance worth noting, though. Ultrasound helps a lot at the moment of insertion, but a systematic review and meta-analysis covering over 78,000 participants found that it did not significantly improve post-insertion outcomes like catheter failure rates or dwell time once the line was in and secured.²¹ In other words, ultrasound gets the catheter in more safely, but whether it stays working depends on securement, catheter size, the patient’s movement, and the solutions being infused. The technology helps solve one half of the problem.

What Multiple Attempts Feel Like for the Patient

Beyond the physical complications, there is a real psychological toll to a botched IV. An emergency-department study measured pain scores on a 100-millimeter scale and found that patients who needed multiple needle sticks reported pain scores roughly double those of patients who got the IV on the first try. Patients who endured three or more attempts rated the pain about 33 millimeters higher than single-stick patients, and those with five attempts reported the highest average pain in the study.²² More than half of the multiple-stick group said the IV placement was the most painful part of their entire emergency visit.

The ripple effect extends beyond pain. Patients who experience multiple needle attempts or IV-related complications are more likely to lose trust in their healthcare providers and report anxiety about future procedures. Satisfaction with IV placement tracks closely with satisfaction with the overall hospital stay.²³ For patients with chronic illnesses who face repeated hospitalizations, each bad experience compounds into vein-access anxiety that makes future insertions harder as the patient tenses up, veins constrict, and the cycle feeds itself.

The Financial and Legal Side

IV complications carry costs that extend well beyond the bedside. When infiltration or extravasation causes significant harm, the resulting treatment, extended hospital stays, and potential surgeries add up. The legal exposure is real as well: a report from the UK’s National Health Service found that extravasation injury claims between 2010 and 2021 cost the system £16 million, combining both legal fees and damages paid out.²⁴ In the United States, where litigation costs run even higher, infiltration injuries are a well-recognized source of malpractice claims in nursing and hospital settings. The bulk of successful claims involve cases where the complication was missed or documented too late, not simply cases where the first stick was difficult.

Hospitals increasingly track IV-related complications as quality metrics, tying them to nurse staffing ratios, training protocols, and adoption of technologies like ultrasound and near-infrared vein finders. From the patient’s perspective, the practical takeaway is straightforward: if your IV site starts swelling, turning red, hurting more than it should, or feeling cold and tight, tell someone immediately. Most serious IV complications are not the result of the initial mistake alone but of the mistake going unrecognized long enough for the damage to escalate.