A CVC, or central venous catheter, is a long, flexible plastic tube placed into one of the large veins near your heart. Unlike a standard IV in your hand or arm, which typically lasts only a few days, a central line can stay in place for weeks, months, or even years. It’s used when you need medications, fluids, or nutrition delivered directly into a high-volume vein, or when doctors need reliable access for frequent blood draws.
Why You Might Need a CVC
Central lines are placed when a regular IV won’t do the job. Some medications, like chemotherapy drugs, are too harsh for small veins and can damage them. Other situations simply require vein access that lasts longer than a peripheral IV can provide. Common reasons for getting a CVC include:
- Chemotherapy that would irritate smaller veins
- Long-term antibiotics lasting weeks or months
- Dialysis for kidney failure
- Nutritional support delivered directly into the bloodstream
- Blood or platelet transfusions
- Frequent blood draws to monitor a condition
- Emergency fluids or blood during shock or trauma
Where a CVC Gets Placed
The catheter tip sits in a large vein just above or near the heart, but the entry point on your body depends on the type of line and your medical situation. The three main insertion sites are the neck (internal jugular vein), just below the collarbone (subclavian vein), and the groin (femoral vein).
The right side of the neck is the most commonly preferred spot because the vein there is larger and provides the straightest path to the heart. The collarbone site carries a slightly higher risk of a collapsed lung or bleeding. The groin site has a higher risk of infection and is generally avoided in patients who are obese. Your medical team picks the site based on your body, your condition, and how long the line will be needed.
Types of Central Lines
Not all CVCs are the same. There are four main types, each designed for different situations and timeframes.
Non-Tunneled Catheters
These are inserted directly through the skin into a central vein. They’re the quickest to place, making them the go-to choice in emergencies or short-term hospital stays. The tradeoff is that they carry the highest infection risk among central line types.
PICC Lines
A peripherally inserted central catheter enters through a vein in your upper arm rather than your neck or chest. The catheter is longer (20 cm or more) and threads through until the tip reaches a large vein near the heart. PICCs have a lower infection rate than non-tunneled lines and are commonly used for weeks-long antibiotic courses or chemotherapy that doesn’t require the highest flow rates.
Tunneled Catheters
These are threaded under the skin for several inches before entering the vein. The tunneling creates a barrier against bacteria, and a small cuff on the catheter encourages tissue to grow around it, anchoring it in place and further reducing infection risk. Tunneled lines are built for longer use, often months.
Implanted Ports
A port is a small reservoir placed completely under the skin, usually on the upper chest. When you need treatment, a nurse accesses the port by pressing a special needle through the skin into the reservoir. Between treatments, there’s nothing visible outside your body. Ports have the lowest infection risk of all central line types and require no daily care at home when not in use. They’re a common choice for people receiving chemotherapy over many months. The downside is that placing and removing a port requires a minor surgical procedure.
How Insertion Works
For most CVCs, you’ll lie flat or with your head tilted slightly downward. This position fills the target vein with blood, making it easier to access and reducing the chance of air entering the bloodstream. The insertion area is cleaned with an antiseptic solution, and the medical team wears full sterile gear: mask, cap, gown, sterile gloves, and a large sterile drape covering your body.
Ultrasound guidance is now standard practice. The doctor uses an ultrasound probe to see the vein on a screen in real time, which dramatically reduces complications. A 2024 systematic review in JAMA Internal Medicine found that ultrasound guidance cut the rate of accidentally hitting an artery by about 80% and reduced the risk of a collapsed lung by about 75% compared to using anatomical landmarks alone.
Once the vein is located, a needle is inserted under ultrasound view. A thin wire is then fed through the needle into the vein, the needle is removed, and the catheter is slid over the wire into position. The wire comes out, and the catheter is secured with sutures or an adhesive device. A chest X-ray usually confirms the tip is in the right spot. The whole process typically takes 30 to 60 minutes, though emergency placements can be faster.
Risks and Complications
Central lines are generally safe, but they do carry real risks. Based on a large meta-analysis, roughly 30 out of every 1,000 patients with a CVC in place for three days will experience at least one serious complication, including arterial puncture, collapsed lung, infection, or blood clot.
The most closely watched risk is a central line-associated bloodstream infection, or CLABSI. Bacteria can travel along the catheter into the bloodstream, causing a potentially dangerous infection. Hospitals follow strict prevention protocols: daily assessment of whether the line is still needed, regular dressing changes, antiseptic cleaning of all access points before each use, and daily skin cleansing with antiseptic solution for ICU patients. These bundled practices have significantly reduced infection rates over the past two decades.
Mechanical complications happen mostly during or shortly after insertion. A collapsed lung (pneumothorax) can occur when the catheter is placed near the collarbone or neck, though ultrasound guidance has made this uncommon, occurring in roughly 2 to 3 per 1,000 insertions when ultrasound is used. Blood clots can form around the catheter tip over time, sometimes causing swelling in the arm, neck, or leg depending on where the line sits.
Caring for Your CVC at Home
If you go home with a central line, you’ll need to keep it clean and functioning. Transparent dressings over the insertion site are changed every seven days. If gauze is used instead, it gets changed every 48 hours. Any dressing that gets wet, dirty, or starts peeling needs to be replaced right away.
Flushing keeps the line from clogging. Each opening (lumen) of the catheter is flushed with 10 ml of saline solution after medications, after blood draws, and every 12 hours if the line isn’t being used. The flush is done with a push-pause technique: push a small amount, pause, push again, and repeat until the full amount is delivered. You’ll always use a 10 cc syringe or larger, because smaller syringes create too much pressure and can damage the catheter.
You’ll want to keep the site dry during showers (waterproof covers are available) and avoid tugging on the line. Signs of trouble include redness, swelling, or warmth around the insertion site, fever, chills, or any fluid leaking from the catheter.
How a CVC Is Removed
Removal is simpler than insertion but still follows careful steps. The biggest concern is preventing air from entering the vein through the catheter tract. You’ll lie flat or with your head tilted slightly downward so that pressure inside the vein stays higher than the outside air.
Just as the last portion of the catheter is pulled out, you’ll be asked to bear down as if straining (called a Valsalva maneuver), which temporarily raises pressure in your veins and keeps air out. If you can’t do this, the team will time the removal to coincide with the moment you breathe out. An airtight dressing goes over the site immediately after. You’ll stay lying flat for about 30 minutes afterward, giving the tract time to begin closing and the dressing time to form a seal.