Have you ever been to a hospital to see a patient who is unable to eat by mouth, and they are being given fluids through a large bag through a vein? We often think of it as saline. But it's not always just saline. Sometimes it's a special fluid that contains all the nutrients a person needs to survive. That's what we call 'intravenous nutrition', or in medical terms, Parenteral Nutrition .
Simply put, what is Parenteral Nutrition?
Simply put, this is when you bypass your digestive system (the entire system from your mouth to your anus) entirely and deliver nutrients directly to your body through a blood vessel. The word "parenteral" means "outside the digestive system."
You may have heard of enteral nutrition. This involves giving liquid food directly into the stomach or small intestine through a tube inserted through the nose or a small opening in the stomach. But with parenteral nutrition, this entire system is bypassed and nutrients are added directly into the bloodstream. In some medical conditions, this method may be needed for a short or long period of time. Some people are given this to supplement the food they eat by mouth. Others need to get all their calories through this intravenous nutrition.
What are the main types of this method?
This method of parenteral nutrition can be divided into two main types. One is based on the amount of nutrition given, and the other is based on the type of vein used to provide nutrition. Let's understand both of these clearly.
1. Sorting by the amount of nutrition provided
There are two main types of this.
| Nutritional system | Simply put... |
|---|---|
| Partial Parenteral Nutrition (PPN) | This is given in addition to other nutritional methods. Imagine that a person can eat a little by mouth, but it is not enough to provide the body with the nutrients it needs, and he is suffering from malnutrition. In such cases, this method is used to provide some of the missing nutrients or extra calories. |
| Total Parenteral Nutrition (TPN) | This is a method of giving complete nutrition through a vein. This is necessary for people who cannot use their digestive system at all. Due to some medical conditions, they are unable to digest food and absorb nutrients. At other times, it is necessary to give the digestive system a complete rest and allow it to heal. In such cases, TPN is used. |
2. Classification by the type of vein used
| Type of vein | Description |
|---|---|
| Through a main vein (Central Parenteral Nutrition - CPN) | This involves feeding into a large, main vein in the body. This is usually the Superior Vena Cava, a large vein under the collarbone that goes directly to the heart. Because this vein is large, it can deliver a more concentrated, high-calorie liquid nutrient quickly. This is why it is used to provide total parenteral nutrition (TPN). |
| Through a small, peripheral vein (Peripheral Parenteral Nutrition - PPN) | This involves feeding into a small vein in the arm, leg, or neck. Because it is easy to do, this method is used to provide temporary partial nutrition (PPN). |
What does this nutritional liquid contain?
This is a chemical formula. But this is not something that is given to everyone in the same way. According to your body's needs, based on your blood test results, you are given a customized nutritional solution.
It can contain all six essential nutrients for the body in varying amounts:
- Water
- Carbohydrates (for energy)
- Proteins (for body growth and repair)
- Fat (for energy and essential fatty acids)
- Vitamins
- Mineral salts
This nutritional formula is so complete that, if desired, a person could live on this system for the rest of their lives without taking anything by mouth.
In what situations are these methods used?
When is partial nutrition (PPN) necessary?
PPN is often used temporarily. For example, it is used to give someone a quick boost of energy before gradually transitioning them to tube feeding or oral feeding. Also, patients who are hospitalized for long periods of time may become malnourished for various reasons. PPN is also commonly used to provide them with additional nutrition.
When is total parenteral nutrition (TPN) needed?
If your digestive system is not functioning at all, or if you have a gastrointestinal disease that requires complete rest for that system, you may need TPN.
Here are some specific situations where TPN may be necessary:
- Major abdominal surgery
- Chemotherapy for cancer
- Reduced blood flow to the intestines (Intestinal ischemia)
- Intestinal obstructions in the small or large intestine
- Intestinal dysfunction (Prolonged ileus)
- Gastrointestinal bleeding
- Damage to the intestines due to radiation treatment (Radiation enteritis)
- Extremely premature birth
- Necrotizing enterocolitis in infants
- Prolonged diarrhea
- Inflammatory bowel diseases such as Crohn's disease
- Short bowel syndrome (a condition that occurs after part of the intestine is surgically removed)
- Graft-versus-host disease of the gut
How is the preparation and implementation of this treatment done?
This is a very planned and collaborative effort by a team of doctors.
Preparing for treatment
Your medical team (doctors, nurses, and nutritionists) will carefully review your health history, body mass index (BMI), and blood test results to determine the nutritional formula you need. This nutritional liquid is prepared by a specialist in doses that are sufficient for 24 hours. It should be refrigerated until the day you need it. It is taken out a few hours before use and allowed to come to room temperature.
How to insert a catheter into the body
Inserting the tube, called a catheter, into your body is a minor surgical procedure. Before this is done, you will be given a numbing medication to numb the pain and calm you down. Then, the area where the catheter will be inserted will be thoroughly cleaned and disinfected.
The doctor inserts a guidewire into the vein using a needle, then removes the needle and threads the catheter through the wire into the vein. An ultrasound or X-ray may be used to check that it is in the right place.
Three main types of catheters are used:
- External “tunneled” catheter: This is designed to go a short distance under the skin and come out from a different location.
- Fully implanted catheter: This is completely under the skin. When feeding is needed, a needle is inserted into a special port under the skin and connected to it.
- Peripherally inserted central catheter (PICC): This is inserted through a vein in the upper arm and threaded to a main vein near the heart. This is usually used for people who need nutrition for less than 6 weeks.
The most important thing is to carry out this entire process under very clean, sterile conditions, as there is a risk of infection.
How is nutrition provided and monitored?
Feeding is usually a 10-12 hour process, so many people do it at night when they go to bed. This treatment can be done in a hospital, long-term care facility, or even at home .
If you are doing this at home, the medical team will provide you or your caregiver with full training, including how to recognize signs of infection, how to keep the equipment clean, and how to change the tubes.
The medical team will constantly monitor you during treatment.
- It measures the amount of fluid entering and leaving your body.
- Weight and height are checked regularly.
- Blood tests are done at regular intervals to see if changes to the nutritional formula are needed.
In particular, they focus on these things:
- Electrolytes and kidney function (BUN/Creatinine)
- Blood sugar levels (avoid hyperglycemia or hypoglycemia)
- Mineral levels
- Liver function indicators (Aminotransferases, Bilirubin)
What are the advantages and dangerous risks of this method?
Like any medical treatment, this one has both benefits and risks.
Benefits
The main benefit of this method is that it gives your digestive system the rest it needs to heal after a serious illness or surgery. It also helps strengthen the body by providing the necessary nutrition for patients who are hospitalized for a long time, especially the elderly. It is a life-saving treatment for those whose digestive system is permanently damaged and for babies who are born prematurely and cannot eat normally.
Risks and Complications
This method carries a higher risk of complications than enteral feeding. The two main problems are the risk of germs entering the bloodstream through the catheter and the weakening of the digestive system due to prolonged disuse.
| Common complication | A simple explanation |
|---|---|
| Infection | Bacteria can enter the bloodstream through the catheter. If this infection spreads throughout the body, it can cause a life-threatening condition called sepsis . |
| Blood clots | Blood clots can form where the catheter connects to the vein. |
| Weakening of the digestive system (GI atrophy) | After about two weeks of not using the system, its performance begins to decline. However, it gradually returns to normal when you start eating again. |
| Sugar level imbalances | Hyperglycemia or hypoglycemia are common and can be managed by adjusting insulin and nutritional regimens. |
| Liver problems | About 50% of people who take this treatment long-term may develop liver disease (PNALD) within 5-7 years. The exact cause of this is not known. |
| Gallbladder problems | Because the digestive system is not functioning, bile in the gallbladder cannot be released and can accumulate, forming stones. |
| Bone demineralization | People who receive this treatment for a long time may develop bone thinning diseases such as osteoporosis due to vitamin and mineral deficiencies (calcium, magnesium, vitamin D). |
In addition, there are other potential risks, such as injury during catheter insertion, fluid overload, and feeling hungry.
How do you start eating by mouth again?
Although parenteral nutrition can be done long-term, doctors always try to switch you back to tube feeding or oral feeding as soon as possible. The reason for this is to avoid long-term complications.
This transition is done very gradually and slowly because, like your underlying medical condition, a digestive system that has been "dormant" for a while will not suddenly start working.
1. Start with a clear liquid diet .
2. If the body responds well to it, then switch to a full liquid diet .
3. Finally, gradually introduce solid foods .
Even after stopping this treatment, the medical team will continue to monitor your weight and nutritional levels for some time.
Parenteral Nutrition is a medical treatment that is used in the most severe cases, but sometimes it is necessary to save a life. If this is necessary for you or a loved one, it can be a bit of a difficult and new experience. But after a while, it will become part of your daily routine. The most important thing is to follow the instructions given by the medical team exactly and to inform them of any problems.
Take-Home Message
- Parenteral Nutrition is a method of delivering nutrition directly into the bloodstream through a vein when the digestive system cannot be used.
- There are two main types: PPN, which is given as supplemental nutrition, and TPN, which provides complete nutrition.
- Although this is a life-saving treatment, there are serious risks, such as infections, blood clots, and liver problems.
- This treatment should always be carried out under the close supervision of a team of doctors, nurses, and nutritionists.
- If you or a loved one has to undergo this treatment at home, it is essential to receive proper training and take great care with cleanliness. If you have any concerns or questions, talk to your doctor immediately.
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