A central venous catheter (CVC) is a long, thin tube placed into a large vein and threaded until the tip sits near the heart. It provides reliable access to the bloodstream for delivering medications, fluids, or nutrition that can’t safely go through a regular IV. More than one type exists, and which one you get depends on how long you’ll need it and what it’s being used for.
How It Works
A standard IV goes into a small vein in your hand or forearm. A central venous catheter goes into one of the body’s large veins, most commonly in the neck (internal jugular vein), below the collarbone (subclavian vein), or the upper thigh (femoral vein). From there, the catheter is advanced until the tip rests in either the superior vena cava or inferior vena cava, the two largest veins that feed directly into the heart.
Because these veins carry high volumes of blood flow, medications delivered through a CVC are diluted almost instantly. That makes central lines essential for drugs that would damage smaller veins, including chemotherapy agents, blood pressure medications used in critical care, and concentrated nutrient solutions. A central line can also be used for hemodialysis, plasma exchange, and certain cardiac procedures that require direct access to the large veins near the heart.
Why a Central Line Is Needed
The most common reasons for placing a CVC fall into a few categories. Some medications are simply too harsh for small peripheral veins. Chemotherapy drugs, for instance, can cause tissue damage if they leak out of a small vein, and high-concentration salt or sugar solutions can irritate vein walls. Delivering them through a central line eliminates that risk.
Long-duration treatments also call for central access. If you need weeks of IV antibiotics or total parenteral nutrition (liquid nutrition delivered directly into the bloodstream), a peripheral IV would need to be replaced every few days. A central line can stay in place much longer, reducing the number of needle sticks. Specialized procedures like hemodialysis require the high flow rates that only a large-bore central catheter can provide.
Types of Central Venous Catheters
There are four main types, each designed for a different duration and situation.
- Non-tunneled catheters are the most common short-term option. They’re inserted directly through the skin into a large vein in the neck, chest, or groin. They can have up to three separate channels (lumens) for delivering different medications at the same time. They’re designed to stay in place for roughly two to three weeks.
- PICC lines (peripherally inserted central catheters) go in through a vein in the upper arm and are threaded until the tip reaches a large central vein near the heart. Because the insertion site is in the arm rather than the neck or chest, placement carries a lower risk of serious complications. PICCs can remain in place for up to six months, making them a good fit for courses of IV antibiotics or chemotherapy that last several weeks to a few months.
- Tunneled catheters (such as Hickman or Broviac lines) are placed through a short tunnel created under the skin before entering the vein. The tunnel helps anchor the catheter and creates a barrier against infection. These are built to last months to years and are often used for long-term chemotherapy, parenteral nutrition, or frequent blood draws.
- Implanted ports are completely buried under the skin. A small reservoir (the port) sits beneath the skin of the chest, connected to a catheter that runs into a large vein. To use it, a nurse pushes a special needle through the skin into the port. When not in use, there’s nothing visible on the outside, which makes ports the most discreet option. They can last for years and are popular for cancer patients who need intermittent chemotherapy cycles over a long treatment period.
How a Central Line Is Placed
Placement is typically done at the bedside or in a procedure room using local anesthesia, so you’re awake but the area is numbed. Real-time ultrasound guidance is now the standard of care. The ultrasound lets the clinician see the vein on a screen and guide the needle precisely into it, which significantly reduces the risk of complications compared to the older landmark-based technique, where clinicians relied on surface anatomy alone to find the vein.
Once the needle enters the vein, a thin guidewire is fed through it, the needle is removed, and the catheter is slid over the wire into position. For most people the procedure takes 15 to 30 minutes. A chest X-ray is taken immediately afterward to confirm that the catheter tip is in the right spot and to check for complications like a collapsed lung (pneumothorax). The standard reference point on the X-ray is the carina, the spot where the windpipe divides into the two main airways, which is visible on about 96% of chest films and sits at a predictable level relative to the heart.
Risks and Complications
Central lines are generally safe, but they do carry more risk than a peripheral IV. Research published in the New England Journal of Medicine found that more than 15% of patients experience a significant complication, whether mechanical, infectious, or related to blood clots.
Mechanical complications happen during or shortly after insertion. These include accidental puncture of an artery, bleeding, and pneumothorax (air leaking into the space around the lung, which can make it partially collapse). Ultrasound guidance has made these events less common, but they haven’t been eliminated entirely.
Infection is the most closely watched risk. Central line-associated bloodstream infections (CLABSIs) occur when bacteria travel along the catheter into the blood. These infections can be serious, but rates have been declining nationally. CDC data from 2024 shows a 9% decrease in CLABSIs compared to the 2015 baseline, with improvements in both intensive care units and general hospital wards. Strict hygiene protocols during insertion, regular dressing changes, and removing the catheter as soon as it’s no longer needed are the primary strategies for keeping infection risk low.
Blood clots can form around the catheter tip or along the vein wall. This is more common with catheters that stay in place for longer periods. Symptoms of a catheter-related clot include swelling, pain, or redness near the insertion site or along the arm or neck.
Caring for a Central Line at Home
If you’re sent home with a PICC line, tunneled catheter, or port, you’ll be taught how to maintain it. The most important routine task is flushing. Each lumen needs to be rinsed after every use with a saline syringe, and sometimes with a heparin syringe as well. Heparin is a blood-thinning solution that helps prevent clots from blocking the catheter. Flushing should be done gently, using a push-pause technique rather than forcing fluid through all at once.
The dressing over the insertion site needs to be changed on a regular schedule, typically once a week or whenever it becomes damp, loose, or dirty. The caps on the end of the catheter (called claves) should be replaced when the dressing is changed and after blood draws. Keeping the site clean and dry is the single most important thing you can do to prevent infection. Signs of trouble include redness, swelling, warmth, or drainage around the insertion site, as well as fever or chills, which can indicate a bloodstream infection.
How a Central Line Is Removed
Removal is simpler and faster than insertion. For non-tunneled catheters and PICC lines, the catheter is gently pulled out at the bedside. The key safety concern during removal is preventing air from entering the vein, which can cause an air embolism. To reduce this risk, you’ll be asked to lie flat or in a slight head-down position, and to hold your breath or hum at the moment the catheter is withdrawn. After removal, the exit site is covered with an airtight, ointment-based dressing, and pressure is applied for 5 to 10 minutes.
Tunneled catheters require a small incision to free the cuff that anchors them under the skin. Implanted ports are removed through a minor surgical procedure, usually under local anesthesia, since the entire device sits beneath the skin.