Gallstones (cholelithiasis)

The term cholelithiasis refers to the presence of gallstones. These can occur either in the gallbladder (cholecystolithiasis), the bile ducts (choledocholithiasis) or in the small bile ducts of the liver (cholangiolithiasis). Around 10 to 15 % of the population have gallstones, although most of those affected remain symptom-free. Small gallstones are also often referred to as bile sand, sludge or gallstones.

The human body produces around 700 ml of yellow-brown to olive-green bile per day, which enables (fat) digestion in the small intestine. This consists of

• Water (82 %)

• electrolytes

• Bile acids (subject to the enterohepatic circulation)

• Phospholipids (especially lecithin)

• cholesterol

• bilirubin

• proteins

The most common forms of gallstones are cholesterol, pigment and mixed gallstones. Cholesterol stones and mixed gallstones together account for around 80 % of gallstones in industrialized countries. Pigment stones account for around 20% of gallstones.

Gallstones are caused by an incorrect composition of the bile. If there is an imbalance of soluble substances, gallstones can form.

Risk factors for the development of gallstones:

• older age

• female gender

• pregnancy

• beingoverweight (obesity)

• positive family history

• certain ethnic background

• Diabetes (diabetes mellitus type 2)

• Rapid weight reduction (e.g. dieting)

The most important risk factors for gallstones can be easily remembered using the 6F rule. These are: female, fat, fertile, forty, familial and fair.

Underlying diseases that can favor the occurrence of gallstone disease are

• a disturbed enterohepatic circulation (e.g. in Crohn's disease)

• Haemolytic anaemia

• hyperparathyroidism

• LPAC syndrome ("low phospholipid associated cholelithiasis")

• Cystic fibrosis

• Meulengracht's disease

• Myotonic dystrophy

Gallstones often cause no symptoms, so that around 75% of those affected remain asymptomatic. The typical symptom of gallstones in the gallbladder (cholecystolithiasis) is biliary colic. Symptoms are also frequently triggered by an obstruction or inflammation of the bile ducts.

Patients with symptomatic gallstones (around 25% of those affected) have an increased risk of a number of complications (e.g. pancreatitis, gallbladder inflammation).

Symptoms that can occur as a result of gallbladder disease are

• Cramp-like or persistent pain in the right upper abdomen (colic)

• Dull, non-specific upper abdominal pain

• Pain after eating

• Pain that radiates to the right shoulder

• Feeling of fullness

• Nausea

• vomiting

If the stones are located in the bile ducts and obstruct the outflow of bile, further symptoms may occur:

• Yellowing of the skin and eyes (jaundice, icterus)

• dark urine

• pale stools

• chills

• fever

• Signs of sepsis

Biliary colic lasting more than 5 hours is usually caused by a complicated gallstone disease. About half of all people with biliary colic experience another colic or other gallstone complications within a year.

In the case of symptomatic gallstone disease, a detailed medical history and clinical examination findings are crucial for the diagnosis. Pressure pain often occurs in the right upper abdomen.

An ultrasound examination of the upper abdomen (upper abdominal sonography) is particularly suitable for diagnosing gallstones, for example in the gallbladder. Upper abdominal sonography can also be used to assess the intrahepatic bile ducts. Computed tomography (CT) is particularly suitable in complicated cases or in an emergency situation - here, for example, a gallbladder perforation or pancreatitis can be detected.

The Murphy sign describes an examination in which the patient takes a deep breath and the doctor simultaneously palpates with his fingers under the right costal arch (area of the gallbladder). If the gallbladder is inflamed, this causes pain and the doctor can feel the gallbladder.

Laboratory examination

The blood test is usually unremarkable in the case of simple biliary colic. In the case of gallbladder inflammation or inflammation of the bile ducts, there is often an increase in white blood cells (leukocytosis) and an increase in C-reactive protein (CRP).

Asymptomatic gallstone disease does not need to be treated. Only around 1% of asymptomatic gallstones develop into gallstones with symptoms within a year. However, if symptoms occur in the course of the gallstones, this is usually an indication for laparoscopic removal of the gallbladder (cholecystectomy). The recurrence rate for symptomatic gallstone disease is around 50% with a complication rate of 1 to 3% per year.

Symptomatic therapy

Spasmolytics (e.g. intravenous N-butylscopolamine) can be used for acute biliary colic. Contraindications such as glaucoma, cardiac arrhythmia or pregnancy should be taken into account. Painkillers such as metamizole, paracetamol or opiate derivatives such as pethidine are also suitable for the symptomatic treatment of pain. Antibiotic therapy (e.g. ceftriaxone plus metronidazole) is often recommended for acute gallbladder inflammation or inflammation of the bile ducts (cholangitis). The most common pathogens of gallbladder inflammation are enterococci or Escherichia coli.

Conservative stone therapy

If the risk of surgery is high, conservative litholysis using ursodeoxycholic acid (UDCA) can be performed. However, this is only recommended for small gallbladder stones < 5 mm. In addition, therapy should be continued for a further three months if the patient is stone-free (confirmed by ultrasound).

Complications that can occur in the course of gallstone disease are

• Acute inflammation of the gallbladder(cholecystitis)

• Inflammation of the bile ducts (cholangitis)

• Inflammation of the pancreas(pancreatitis)

• Jaundice (icterus)

• Increased risk of gallbladder or bile duct cancer

Operations on the gallbladder and bile ducts are relatively low-risk routine procedures and are therefore generally well tolerated by patients. In addition, the complication rate is usually low. Unfortunately, non-surgical treatments for gallstone disease have a high recurrence rate.

The most common complication of gallstone disease is acute inflammation of the gallbladder (cholecystitis) due to obstruction of the bile duct. In rare cases, the stone may also break through into the abdominal cavity or the small intestine (perforation). In most people, the bile duct leads into the small intestine together with the pancreatic duct. An obstruction with a backlog can therefore trigger an inflammation of the pancreas(acute pancreatitis).

No specific measures are currently known to prevent gallstones. In general, a healthy lifestyle with a balanced diet and regular physical activity (sport) is recommended.

Risk factors for gallstones are obesity and a diet high in cholesterol and low in fiber. These factors should be kept as low as possible, even if gallstones have already occurred in the past.