When you take medication for a long time, especially when you have to inject it into a vein, it's so annoying to have to stick needles in your veins every day, isn't it? Sometimes it's hard to find a vein, and if you keep sticking needles in your veins, you can damage them. So today we're talking about a special device that can be very helpful for both patients and doctors in situations like this. That's what we call a central line, or CVC.
What exactly is a central line (CVC)?
Simply put, a central line is a very thin, long, flexible tube that is inserted into a large vein in your body. It is usually inserted into a large vein in your neck, chest, groin, or arm, and the other end of the tube is threaded into the main vein that carries blood to the heart (the `vena cava`).
Think of it like a special 'highway' that's placed in your bloodstream. Through this 'highway', doctors and nurses can easily access your bloodstream.
The protruding part of this tube can be of two types:
1. As a hub: This is the part that is visible through your skin. This is where things like the saline tube that gives you medication are connected.
2. As a port: This is a small device, about the size of a coin, that is inserted under the skin. Only a small incision in the skin is visible. When medication needs to be given, a special needle is inserted through that incision and into the skin.
The biggest advantage of this is that once you have it inserted, you can do many things like take medicine, draw blood, and give saline, without having to get a needle every time for a long time .
What is the difference between a central line and a regular cannula (Peripheral IV)?
There are three main differences between the cannula (also called a 'catheter') that we usually get in the hospital and this central line. You'll easily understand it when you look at this table.
| Reason for the change | Central Line (CVC) | Normal cannula (Peripheral IV) |
|---|---|---|
| Place of insertion into the body | It is injected into a large, deep vein in the neck, chest, groin, or upper arm. | It is usually injected into a small vein that is visible above the skin, usually in the arm or hand. |
| Size and length | This tube is very long and thick. It needs to be long because it needs to go close to the heart. Sometimes there are ones with two or three tubes (lumens). These are used to give several types of medication at once. | This is short and subtle. It only goes a short distance into the vein. |
| The time it can be kept in the body | Depending on the type, it can be kept for weeks, months, or even years . | Usually it needs to be changed every few days . |
Who needs this central line?
Doctors often decide to place a central line like this when a patient needs long-term treatment. For example:
- For cancer patients: Continue giving chemotherapy.
- For kidney patients: Hemodialysis for the blood purification process.
- For people taking intravenous antibiotics for a long time: Some severe infections require weeks of medication.
- For those who need frequent blood draws: People with blood disorders need to have blood samples taken regularly.
- For those who cannot eat through the digestive system: Some patients need to be fed directly into the veins.
- In an emergency: In cases such as ``hypovolemic shock``, when a large amount of fluid or blood needs to be given at once after a major accident.
- For those receiving treatment from home: This makes it easier to receive some treatments from home.
What types of central lines are there?
Your doctor will choose the type that is right for you based on your medical condition and how long you want to keep it. There are several main types.
| Type name | Description (How does this work?) | Usually used time |
|---|---|---|
| Non-tunneled Central Venous Catheter | This is injected directly into a vein in the neck, chest, or groin. It is used in emergencies and for short-term needs. | Less than 2 weeks |
| PICC Line (Peripherally Inserted Central Catheter) | This is inserted through a vein in the upper arm and sent to the heart. Since it is in the arm, it is a little easier for daily activities. | From a few weeks to a few months |
| Tunneled Central Venous Catheter | This is done through a minor surgical procedure. There are two places where the tube is inserted into the vein and where it exits the skin. The tube comes out through a small "tunnel" under the skin. This reduces the risk of infection. (Example: Broviac®, Hickman® ) | For several months or longer |
| Subcutaneous Port (Implanted Port) | This is a device that is completely hidden under the skin. It is inserted through a small surgery. Nothing is visible from the outside. A needle is inserted above the skin only when medication is needed. There is no restriction on bathing or swimming. (Example: Port-a-Cath ) | For very long-term use, more than 3 months |
How do you install this central line?
This procedure is performed by a doctor who has received special training for this purpose. The procedure may vary slightly depending on the type of CVC you have.
What happens before the central line is placed?
Your doctor will explain the procedure to you, including the benefits and risks. This is a good time to ask any questions you may have. Your consent will then be obtained. In an emergency, there may be no time for this discussion. You will be positioned (usually lying down) and connected to monitors to monitor your heart rate and blood pressure.
What happens when you put this on?
Most of the time, you will be given a numbing medicine so you won't feel any pain. You may also be put to sleep (sedation). The procedure usually goes like this:
1. The area of skin where the needle will be inserted is thoroughly cleaned and disinfected.
2. They inject medicine to numb the area.
3. Then, with the help of an ultrasound scanner, the vein is precisely located and a needle is inserted into it.
4. A thin wire (guidewire) is passed through the needle and into the vein.
5. The puncture site is slightly enlarged with a small blade, and a device called a dilator is used to make room for the CVC tube.
6. Then, the CVC tube is slowly passed over the wire and into the vein, stopping when it reaches the correct position near the heart.
7. Finally, the exposed part of the tube is sutured to the skin and a bandage is applied to keep the area clean.
A tunneled CVC and port are placed using a small surgical procedure. In the case of a port, a small 'pocket' is created under the skin, the port is placed inside, and the skin is sewn closed.
What happens after you put it on?
After the procedure is complete, a chest X-ray will be taken to make sure the CVC tube is in the correct position and that there are no other problems. If everything is OK, you will be given instructions on when you can go home and how to care for it at home.
What are the benefits of having a central line inserted?
- Reduces the frequency of needle pricks: This reduces the damage to your veins. It also eliminates the fear and discomfort of needle pricks.
- Less pain: Some medications can cause inflammation and pain in the vein when given through a regular cannula. This discomfort is much less with a CVC.
- Long-term use: People who receive continuous treatment do not need to change the cannula every day.
Are there any risks involved?
As with any medical procedure, there are some minor risks, but these don't occur very often.
The main and most common risk is infection . We call this `(Catheter-Related Bloodstream Infection - CRBSI)`. If the area where the tube comes out of the skin is not kept clean, germs can enter.
In addition, there are several other problems that can arise during or after laying the line:
- Bleeding.
- Lung damage (pneumothorax).
- Damage to veins or arteries.
- Blood clot inside a vein (thrombosis).
Your medical team will do their best to minimize these risks, and the most important thing you can do on your part is to keep the CVC site very clean and follow your doctor's instructions carefully.
When you should call your doctor immediately
If you notice any of the symptoms below while you are at home, you should call your doctor immediately without delay . These could be signs of an infection.
| Risk symptoms - pay attention immediately | |
|---|---|
| - Fever. | - Pain or soreness at or around the CVC insertion site. |
| - Redness or red streaks around the skin. | - Swelling of the surrounding skin or feeling warm to the touch. |
| - Yellow or green pus-like fluid is leaking. | - If the CVC tube appears to be protruding (meaning it may be coming loose). |
Also, if your CVC accidentally comes out completely, see a doctor immediately.
Take-Home Message
- A central line (CVC) is a very important device that helps patients receive treatment easily and safely, avoiding the need for daily needles during long-term treatments.
- Your doctor will determine the type of CVC that is right for you based on your needs.
- The main risk of this is infection, so it is essential to keep the skin in and around the CVC very clean.
- If you notice any signs of infection, such as fever, redness, swelling, pain, or pus, tell your doctor immediately.
- If you have any questions or doubts about this, feel free to talk to your doctor about it.
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