Biliary Drainage & Stenting (PTBD)

Introduction

If your doctor has spoken to you about biliary drainage and stenting, you are likely dealing with a blockage of the bile ducts — the small tubes that carry bile from the liver and gallbladder to the intestine. When these ducts are blocked, bile backs up into the liver. This causes jaundice (yellow skin and eyes), itching, dark urine, pale stools, and sometimes infection. Over time, it can damage the liver and make a person very unwell.

Biliary drainage and stenting, also called PTBD (percutaneous transhepatic biliary drainage), is an image-guided procedure that opens this blockage from the outside. An interventional radiologist uses X-ray and ultrasound to guide a fine needle through the skin into a bile duct inside the liver, and then places a thin tube (a catheter) or a small mesh or plastic tube (a stent) to let the bile flow again. The procedure does not involve a large cut, and most patients feel meaningful relief from jaundice and itching within a few days.

This guide explains why PTBD is performed, how it compares with other ways of unblocking the bile ducts, what happens before, during, and after the procedure, what to expect at home with a drain or stent in place, and the longer-term outlook. It is written for patients who have been told they need biliary drainage, or who have just had a drain placed and want to understand what comes next.

What Is Biliary Drainage and Stenting?

Bile is a fluid made by the liver that helps digest fats. It travels through a network of small tubes — the bile ducts — into the duodenum, which is the first part of the small intestine. If any point in this network is blocked, bile cannot drain. The pressure rises inside the liver, and bile components spill into the bloodstream, producing the symptoms of obstructive jaundice.

Biliary drainage and stenting is a way of bypassing or opening this blockage using image guidance rather than surgery or endoscopy. The full medical name is percutaneous transhepatic biliary drainage — “percutaneous” means through the skin, “transhepatic” means through the liver, and “biliary drainage” means draining bile. The short form, PTBD, is what most clinicians use.

The procedure is performed by an interventional radiologist, a doctor who specialises in image-guided treatments. There are two closely related interventions that often happen together or in stages:

• Biliary drainage — placement of a thin catheter into a blocked bile duct so that bile can drain out, either into a bag outside the body, into the intestine, or both.
• Biliary stenting — placement of a small tube (made of metal mesh or plastic) inside the bile duct itself, holding the narrowed area open from the inside so that bile flows normally into the intestine and no external tube is needed.

For some patients, a drain is placed first to relieve the urgent problem, and a stent is placed later once swelling settles or once the cause of the blockage is better understood. For others, drainage alone is the long-term plan. The right path depends on the underlying cause, your overall health, and what other treatment is planned.

Why Is PTBD Performed?

The bile ducts can become blocked for many reasons. PTBD is considered when the blockage is causing symptoms or harm and cannot be safely or successfully treated through endoscopy (ERCP). The most common reasons doctors use PTBD include:

• Cancers that narrow the bile ducts. Cancers of the bile duct (cholangiocarcinoma), gallbladder, pancreas (especially of the pancreatic head), and the ampulla of Vater can press on or grow into the bile ducts. PTBD relieves jaundice so the patient feels better and so other treatments — surgery, chemotherapy, or radiation — can be planned more safely.
• Benign strictures. Scar-tissue narrowings of the bile ducts can occur after gallbladder surgery, liver transplant, chronic pancreatitis, or primary sclerosing cholangitis.
• Stones the endoscopist cannot reach. When stones are stuck high up in the bile ducts or above a previous surgical change to the anatomy (such as Roux-en-Y gastric bypass or hepaticojejunostomy), endoscopic removal may be impossible.
• Bile leaks. A leak from the bile ducts after surgery or trauma can sometimes be controlled by placing a drain that diverts bile away from the leak.
• Cholangitis. This is a serious infection of the bile ducts that develops when bile is blocked. Urgent drainage can be life-saving.
• Preparation for surgery. Some patients with very high bilirubin levels need their liver function to improve before major surgery, such as a Whipple procedure. PTBD can lower bilirubin before the operation.

The shared goal across these situations is the same: restore bile flow, relieve symptoms, and protect the liver and the body from the consequences of obstruction.

Who Is a Candidate?

Whether PTBD is the right choice for a particular patient is a clinical decision made by a team that usually includes a gastroenterologist or hepatologist, a surgeon, an oncologist (where cancer is involved), and the interventional radiologist. The decision considers:

• The cause and location of the blockage. Blockages high in the liver (hilar) are often easier to reach percutaneously than endoscopically; blockages near the lower end of the bile duct may be reached either way.
• Whether ERCP has been tried or is feasible. Endoscopy is usually the first choice when anatomy allows. PTBD is preferred or required when ERCP fails or cannot be performed.
• The patient's overall condition. PTBD can be done in patients who are too unwell for surgery, and it is often the safer option in acute infection.
• Bleeding risk. Clotting tests are checked before the procedure. Significant bleeding tendencies, low platelets, or blood thinners may need to be corrected or paused first.
• Ascites. A large amount of fluid in the abdomen can make the procedure more difficult; sometimes it is drained first.
• The treatment plan as a whole. If the patient is heading for surgery that will reconstruct the bile ducts, the drain placement may be planned to support that surgery. If the goal is long-term symptom relief in advanced cancer, a stent strategy may be planned.

Alternatives to PTBD

Biliary obstruction does not always need a percutaneous approach. The main alternatives are:

ERCP (Endoscopic Retrograde Cholangiopancreatography)

ERCP is an endoscopic procedure in which a long flexible tube with a camera is passed through the mouth, stomach, and into the duodenum, where the bile duct opens. From there, instruments can be guided up into the bile ducts to remove stones, take biopsies, or place stents. For most blockages in the lower bile duct, ERCP is the first option recommended by gastroenterology societies because it does not involve going through the liver. PTBD is often considered when ERCP fails, is not technically possible because of altered anatomy, or cannot reach the blockage.

Endoscopic ultrasound-guided drainage (EUS-BD)

In specialised centres, an endoscopic ultrasound can be used to drain the bile ducts from inside the stomach or duodenum, creating a connection (a fistula) between the bile duct and the gut. This newer technique is becoming more widely used as an alternative to PTBD in some cases. Availability and expertise vary by centre.

Surgical bypass

A surgeon can create a new connection between the bile duct and the small intestine, bypassing the blockage. This is a larger operation and is generally reserved for patients who are fit for surgery and for whom less invasive options are not suitable or are expected to fail. In advanced pancreatic cancer, for example, a surgical bypass may be done at the same time as another operation.

Treating the underlying cause

In some situations — for example, when shrinking a tumour with chemotherapy reduces the pressure on the bile duct — treating the cause is part of the longer-term plan, even if a drain or stent is needed first to relieve the immediate problem.

Choosing among these options is not a simple ranking. It depends on anatomy, the cause of the blockage, the patient's overall condition, and the expertise available. PTBD is one of the most reliable ways to drain bile when other routes are blocked.

Types of Biliary Drains and Stents

External drain

A catheter is placed so that one end sits in a bile duct above the blockage, and the other end exits through the skin and is connected to a drainage bag. All bile drains outside the body. This is often the first step when the blockage is tight and the radiologist cannot pass a wire through it on the first try, or when the goal is to rest the bile ducts (for example, in severe infection).

Internal-external drain

The catheter passes through the blockage, with side holes both above and below it. One end exits through the skin (so it can be flushed and checked), but bile drains both into the intestine through the catheter's internal end and, if needed, out through the bag. Many patients move from an external drain to an internal-external drain once the radiologist is able to cross the narrowed segment.

Internal stent (metal or plastic)

Once the blockage is crossed and the situation is stable, an internal stent may be placed inside the bile duct. The external catheter is then removed, leaving nothing on the outside of the body. Two main stent types are used:

• Self-expanding metal stents (SEMS) — small mesh tubes that expand to keep the duct open. They tend to stay open longer and are often chosen for cancers that are not going to be removed by surgery.
• Plastic stents — thinner tubes that work well for shorter periods. They are sometimes used as a temporary measure, especially in benign disease where the duct may eventually heal.

The choice between drain and stent, and between metal and plastic, is made by the team based on the cause of the blockage, the expected length of treatment, and whether surgery is planned later.

Preparing for the Procedure

PTBD is usually planned, although in cases of severe infection (cholangitis) it may be done urgently. Preparation typically includes:

• Imaging. An ultrasound, CT scan, or MRI of the bile ducts (MRCP) is reviewed to plan the safest route into the liver and to understand the level of the blockage.
• Blood tests. Liver function, kidney function, blood count, and clotting tests are checked. If clotting is abnormal, plasma, vitamin K, or platelets may be given to reduce bleeding risk.
• Medication review. Blood thinners (such as warfarin, clopidogrel, or direct oral anticoagulants) are usually paused for a set number of days before the procedure. Diabetic medicines, particularly metformin, may be adjusted around contrast use. Do not stop any medication without instruction.
• Antibiotics. A dose of intravenous antibiotics is usually given before the procedure to reduce the risk of infection, because the bile ducts are often colonised with bacteria.
• Fasting. You will be asked not to eat for several hours before the procedure. Sips of water with medications are sometimes allowed; the team will tell you what applies to you.
• Consent. The interventional radiologist will explain what is planned, the alternatives, the risks, and what to expect afterwards. This is the right time to ask questions about the drain, what it will look like, how long it may stay in, and what daily life with it involves.

What Happens During the Procedure

PTBD is performed in an interventional radiology suite, which is similar to an operating theatre but equipped with X-ray and ultrasound imaging.

Most patients receive sedation (medicine through a vein that makes you relaxed and drowsy) along with local anaesthetic at the skin entry site. General anaesthesia is used less often, mainly in children or in patients who cannot lie still. You will be monitored throughout — heart rate, blood pressure, oxygen, and breathing.

1. You lie on your back on the imaging table. The skin on the right side of your upper abdomen (and sometimes the left, depending on which duct is chosen) is cleaned and covered with sterile drapes.
2. Local anaesthetic is injected into the skin and deeper tissues.
3. Using ultrasound and X-ray guidance, the radiologist passes a fine needle through the skin, between the ribs, and into a bile duct inside the liver. A small amount of contrast (X-ray dye) is injected to confirm the position and to show the bile duct anatomy on the X-ray.
4. A thin wire is passed through the needle into the duct. The needle is exchanged for a small sheath, and the radiologist works wires and catheters down towards the blockage.
5. If the blockage can be crossed in the same session, a catheter is passed through it so that the tip sits in the intestine beyond the blockage. If not, an external drain is left above the blockage and a second attempt is planned later.
6. The catheter is stitched to the skin and connected to a drainage bag. If a stent is being placed, it is positioned across the narrowing and expanded; in some cases the external catheter is removed at the end, and in others it is kept for a short time before removal.

The procedure typically takes between 45 minutes and two hours, depending on the complexity. You may feel pressure or discomfort during certain steps; tell the team so that pain relief can be adjusted.

Recovery and Aftercare

The first hours and days in hospital

You will be moved to a recovery area and then back to the ward. Most patients stay in hospital for at least one to several nights so the team can watch for bleeding, infection, and bile leak, and so the drain output can be observed. Pain at the skin entry site and in the right shoulder (referred pain from the diaphragm) is common in the first day or two and usually responds to standard pain medicines.

Bilirubin levels start to fall within a day or two of successful drainage. Itching often improves first, followed by the yellow colour, which can take one to several weeks to clear depending on how high the levels were.

Learning to live with a drain

• Emptying and recording. You will be asked to measure the bile output each day. A sudden large increase, a sudden drop, or a change to bloody fluid should be reported.
• Cleaning the skin around the drain and changing the dressing as instructed.
• Securing the catheter so it is not tugged. Most drains have a fixation suture; an additional dressing or strap is often used.
• Flushing the drain with sterile saline, usually once or twice a day. The nurse will demonstrate this and watch you do it.
• Capping the drain (closing it off so bile flows internally rather than into the bag) may be possible once the team confirms it is safe. Many internal-external drains can be capped during the day and opened to the bag at night.
• Showering. Most patients can shower with a waterproof cover over the dressing. Soaking in a bath or swimming is generally avoided while the drain is in place.

Diet and activity

There is no special diet after PTBD, although a balanced, low-fat diet can be easier on digestion in the early days. Light activity is encouraged from the day after the procedure. Heavy lifting and strenuous exercise are usually avoided for the first one to two weeks, and longer if the team advises. Driving is usually possible once you no longer need strong pain medicines and can move freely.

Drain or stent changes

Drains are not permanent. Plastic drains usually need to be exchanged every two to three months to prevent them becoming blocked or infected. Exchange is a shorter procedure done in the interventional radiology suite, usually under light sedation. Metal stents, once placed internally, do not need routine exchange but can become blocked over time and may need further intervention.

Risks and Complications

PTBD is generally a safe procedure when performed by an experienced team, but it does carry risks. Knowing what to watch for helps you and your family respond quickly if something is wrong.

Early risks

• Bleeding. Because the catheter passes through the liver, bleeding into the bile ducts, around the liver, or out through the drain can occur. Most bleeding is minor and settles on its own; rarely, it requires transfusion or an additional procedure to stop it.
• Infection and cholangitis. Bile that has been blocked is often colonised with bacteria. Manipulating it can release bacteria into the bloodstream, causing fever and chills. Antibiotics before and after the procedure reduce this risk. Severe infection (sepsis) is uncommon but serious.
• Bile leak. Bile may leak around the catheter or into the abdomen, causing pain and sometimes peritonitis (irritation of the abdominal lining).
• Pneumothorax or pleural effusion. If the needle passes near the lung, air or fluid can collect around the lung. This is uncommon and usually treated with a small chest drain if needed.
• Pain. Discomfort at the skin site and in the right shoulder is normal for a few days.
• Contrast reaction. The X-ray dye used during the procedure can rarely cause allergic reactions or affect kidney function.

Later risks

• Drain blockage. Bile and debris can clog the catheter over time, causing pain, fever, or return of jaundice. Routine flushing reduces this risk; exchange of the drain is the usual solution.
• Drain dislodgement. The catheter can be pulled out accidentally. If this happens, contact the interventional radiology service promptly; the tract can usually be re-used if the issue is addressed within a day or two.
• Stent blockage or migration. Internal stents can become blocked by tumour growth or debris, or can shift out of position. Further intervention may be needed.
• Skin irritation around the drain site.

When to call the team urgently

Contact the team that placed your drain if you develop:

• Fever, chills, or shaking
• New or worsening abdominal pain
• Yellow skin or eyes coming back, or itching returning
• The drain falling out, leaking around the skin, or no longer draining
• Bile that has turned bloody or very dark
• Shortness of breath

Life After PTBD

The experience of living with biliary drainage varies widely depending on the underlying reason it was placed.

For some patients, PTBD is a bridge to a definitive treatment. A patient being prepared for a Whipple procedure or another major operation may have a drain in for a few weeks to bring bilirubin down before surgery, after which the drain is removed in theatre or shortly after.

For patients with advanced cancer, PTBD or an internal stent may stay in place long-term to keep bile flowing. The focus shifts to comfort, daily life, and avoiding complications. Routine drain exchanges, regular blood tests to check liver function, and clear instructions for when to call the team are all part of this plan.

For patients with benign strictures, internal drains or stents may be used for months while the duct heals or is reshaped, and eventually the catheter may be removed entirely.

Most patients adjust to living with a drain after the first one to two weeks, once the dressing routine becomes familiar and confidence returns. Family support and good communication with the interventional radiology team make a substantial difference.

PTBD in Children

PTBD is uncommon in children but is sometimes used in specialised centres — for example, after liver transplant complications, in biliary atresia, or for certain tumours. The principles are similar to those in adults, but the equipment is smaller and the procedure is performed under general anaesthesia. Care is led by paediatric interventional radiologists working with paediatric surgeons and hepatologists. Parents will receive specific instructions tailored to the child's diagnosis and care plan.

Frequently Asked Questions

Will I be awake during the procedure?

Most adults have sedation rather than general anaesthesia, so you are drowsy and comfortable but breathing on your own. You may have hazy memory of the procedure. The team will discuss what type of anaesthesia is best for your situation.

How quickly will my jaundice improve?

Itching often improves within a day or two. The yellow colour of the skin and eyes fades more slowly because bilirubin needs time to clear from tissues. Most patients see a clear difference within one to two weeks, and complete clearance can take longer if levels were very high.

How long will the drain stay in?

This depends on why it was placed. Some drains stay for only a few weeks; others stay for many months. Plastic external or internal-external drains are usually exchanged every two to three months. Once an internal stent is in place, an external catheter is often removed.

Can I shower with the drain?

Yes, in most cases. The drain site is covered with a waterproof dressing during showering. Baths, swimming, and submerging the site are usually avoided. Your nurse will give specific instructions.

What if the drain falls out at home?

Contact the interventional radiology team as soon as possible. If the drain has been in for some time, a tract through the liver has formed, and a new drain can often be placed through the same tract if you are seen quickly. Do not try to push it back in yourself.

Will I still need other treatments after PTBD?

Yes, in most cases. PTBD treats the blockage but does not treat the underlying cause. Depending on your diagnosis, you may still need surgery, chemotherapy, radiation, endoscopy for stones, or treatment for inflammation. The drain helps make those treatments safer and more effective.

Why did the doctor choose PTBD instead of ERCP?

ERCP is usually tried first when the anatomy allows. PTBD is often chosen when ERCP has not succeeded, when the blockage is high in the bile ducts (closer to the liver), or when previous surgery has changed the anatomy so that the endoscope cannot reach the bile duct opening. The decision is made by the team based on imaging and your overall situation.

Can the drain be replaced with a stent so I don't have an external tube?

In many cases, yes. Once the team has crossed the blockage and the situation is stable, an internal stent can often be placed and the external catheter removed. Whether this is suitable for you depends on the cause of the blockage and the longer-term plan.

Will the drain affect my digestion?

If bile is draining externally into a bag rather than into the intestine, you may notice paler stools and some loose stools, especially after fatty foods. Capping the drain (when allowed) or switching to internal drainage usually returns digestion to normal. Some patients are asked to drink the bile output (mixed with juice) to replace its digestive role; this is a specific instruction from the team and is not done routinely.

Is the drain painful?

Most patients describe discomfort rather than sharp pain at the skin site, especially when moving or coughing in the first week. Right shoulder discomfort is common in the first day or two. Standard pain relief is usually enough. Persistent or worsening pain should be reported.

Conclusion

Biliary drainage and stenting (PTBD) is a well-established image-guided way of relieving blockage in the bile ducts when endoscopy cannot do the job, or when a more durable internal solution is needed. For patients with obstructive jaundice from cancer, stones, scarring, or infection, it can bring rapid relief of symptoms, protect the liver, and open the way for further treatment.

The procedure itself is short, and most patients recover quickly from the placement. The bigger adjustment, when it is needed, is to life with a drain or stent — the routine of dressings, flushing, and watching for warning signs. With clear instructions, good support, and regular contact with the interventional radiology team, most patients manage this well, and many move on to an internal stent or to definitive treatment of the underlying cause. The decisions about which drain, which stent, and what next are made together with the team caring for you, based on your diagnosis, your anatomy, and your overall plan of care.