Biliary Dyskinesia

What happens in biliary dyskinesia

The gallbladder stores bile made by the liver. After a meal, especially a fatty one, the hormone cholecystokinin (CCK) makes the gallbladder contract and push bile into the small intestine. In biliary dyskinesia the gallbladder contracts weakly or in an uncoordinated way. The resulting pressure and stretching are thought to cause pain similar to a gallstone attack, called biliary colic.

A related condition, functional sphincter of Oddi disorder, involves the muscle valve where the bile and pancreatic ducts enter the intestine.

Symptoms

The Rome IV criteria describe biliary-type pain as:

• pain in the upper middle belly and/or upper right belly
• building up to a steady level and lasting 30 minutes or longer
• recurring at different intervals, not daily
• severe enough to interrupt daily activities or lead to an ER visit
• not significantly related to bowel movements, not relieved by changing position or by antacids

Other symptoms may include:

• pain spreading to the back or right shoulder blade
• nausea and vomiting
• bloating and belching
• pain after fatty or large meals, or at night

Causes and risk factors

The exact cause is unknown. Possible contributors include reduced sensitivity of the gallbladder to CCK, inflammation of the gallbladder wall (chronic acalculous cholecystitis), and a heightened sensitivity of the nerves of the gut. It is more common in women and is increasingly diagnosed in adolescents.

Before diagnosing biliary dyskinesia, doctors must exclude gallstones, which are far more common.

Diagnosis

1. History: pain pattern matching biliary pain.
2. Abdominal ultrasound: must show no gallstones, sludge or gallbladder wall thickening.
3. Blood tests: liver enzymes, bilirubin, lipase and amylase are usually normal.
4. Upper endoscopy: to rule out ulcers, gastritis and reflux, which cause similar pain.
5. HIDA scan (cholescintigraphy) with CCK: a radioactive tracer is injected and fills the gallbladder. CCK is then given and the percentage of tracer the gallbladder empties is measured. A gallbladder ejection fraction below about 40% supports the diagnosis. Some medicines, such as opioids, can affect the result.
6. Other tests as needed: CT or MRCP (MRI of the bile ducts), and cardiac assessment if heart pain is possible.

Biliary dyskinesia vs other causes of upper belly pain

Treatment

Gallbladder removal

Laparoscopic cholecystectomy is the most common treatment for people who have typical biliary pain, a low ejection fraction and no other cause. Many patients report relief, but studies show mixed results, and a sizable minority continue to have pain afterward. The benefit appears greatest when pain closely matches the classic pattern. Some experts suggest that pain reproduced by CCK during the scan, or a very low ejection fraction, may predict better outcomes, but evidence is not conclusive.

Risks of surgery include bile duct injury (rare), infection, bleeding, and post-cholecystectomy diarrhea.

Non-surgical approaches

• Diet: smaller, lower-fat meals may reduce episodes.
• Pain management: for acute episodes; avoid opioids for regular use where possible, as they worsen biliary spasm.
• Medicines for gut sensitivity: low-dose tricyclic antidepressants or other neuromodulators, particularly if functional dyspepsia overlaps.
• Ursodeoxycholic acid is sometimes tried, with limited evidence.
• Watchful waiting: some people's symptoms settle over time.

Outlook

Biliary dyskinesia is not dangerous in the way gallstones can be. It does not usually cause infection, jaundice or pancreatitis. The main issue is pain and quality of life. Discuss the likely benefit of surgery with a surgeon or gastroenterologist, including the possibility that pain may continue.

Frequently asked questions

What are the symptoms of biliary dyskinesia?

The main symptom is episodes of steady pain in the upper right or upper middle belly, lasting 30 minutes or more, often after fatty meals, sometimes spreading to the back or right shoulder. Nausea, vomiting and bloating are common. Ultrasound shows no gallstones.

What is a normal gallbladder ejection fraction?

A gallbladder ejection fraction of about 40% or more after CCK is generally considered normal on a HIDA scan. A result below about 40% (some centers use 35% or 38%) suggests the gallbladder is not emptying well and supports a diagnosis of biliary dyskinesia.

Does biliary dyskinesia require surgery?

Not always. Gallbladder removal helps many people with typical pain and a low ejection fraction, but not everyone improves. Some people manage with diet changes and medicines. The decision depends on how severe and typical the symptoms are and after other causes are ruled out.

Can biliary dyskinesia go away on its own?

Sometimes. Symptoms can improve over months in some people, especially with dietary changes. Others have persistent episodes. If pain is frequent and disruptive and tests support the diagnosis, surgery is often discussed.

What foods should I avoid with biliary dyskinesia?

Large, high-fat meals are the most common trigger, such as fried foods, fatty meats, rich sauces and full-fat dairy. Eating smaller, lower-fat meals spread through the day may reduce episodes. Keep a food diary to identify personal triggers.