About Primary Sclerosing Cholangitis

Overview

Primary sclerosing cholangitis (PSC) is a chronic liver disease characterized by inflammation and scarring of the bile ducts both inside and outside the liver. This inflammation and scarring can eventually lead to narrowing or blockage of the bile ducts. When the bile ducts are narrowed or blocked, bile, which is a digestive fluid produced by the liver, builds up in the liver and causes further damage. PSC is believed to be an autoimmune disease, where the immune system mistakenly attacks the healthy cells of the bile ducts. Over time, PSC can progress to cirrhosis and potentially liver failure. Common symptoms include fatigue, abdominal discomfort, severe itching, jaundice (yellowing of the skin and eyes), and an enlarged spleen. Treatment for PSC focuses on managing symptoms and preventing complications.

Causes and Risk Factors

Primary sclerosing cholangitis (PSC) is a rare disease that mainly affects the bile ducts inside and outside the liver. The exact cause of PSC is still unclear, but researchers believe it arises from a combination of genetic and environmental factors. Specific genetic variations, particularly in genes involved in immune function, may increase the risk of developing PSC. The most commonly associated genes belong to a family called the human leukocyte antigen (HLA) complex, which helps the immune system distinguish between self and foreign proteins.

Non-modifiable risk factors are risk factors that cannot be changed. Non modifiable risk factors for PSC include:

• Family history: PSC often occurs in several members of a family, suggesting a genetic predisposition. Immediate family members of someone with PSC have an increased risk of developing the condition.
• Inflammatory bowel disease: People with ulcerative colitis and to a lesser extent Crohn’s disease are at higher risk for PSC.

Modifiable risk factors are risk factors that can be changed or influenced. Modifiable risk factors for PSC include:

• Smoking
• Excess alcohol intake
• Obesity

It's important to note that even though these risk factors exist, most people who develop PSC do not have any identifiable risk factors. If you have concerns about your risk or symptoms related to PSC, it's best to consult with your healthcare professional for appropriate evaluation and guidance.

Symptoms

The most common early symptoms of primary sclerosing cholangitis include extreme tiredness, abdominal pain, and itchiness. As the condition progresses or reaches higher severity, other common symptoms may occur, such as:

• Yellowing of the skin and eyes (jaundice)
• Fever, night sweats, and chills
• Nausea
• Weight loss
• Dark colored urine and light colored stools
• Vitamin deficiencies
• Enlarged liver or spleen

It's important to note that some people with PSC may be asymptomatic or have only mild symptoms in the early stages.

Diagnosis

To diagnose primary sclerosing cholangitis, doctors commonly perform the following examinations, tests, and procedures:

• Medical history: Your healthcare provider will gather information about your medical history and any previous diagnoses.
• Physical exam: The healthcare provider will conduct a physical exam to look for physical signs of a medical problem, such as pain, swelling, or masses in the abdominal area of the body.
• Genetic tests: These laboratory tests can help identify genetic changes associated with PSC.
• Blood tests: These tests help evaluate liver function and check for specific markers associated with PSC.
• Imaging: Magnetic resonance imaging (MRI), computed tomography (CT), or ultrasound may be used to visualize the bile ducts and rule out other causes of bile duct damage.
• Specialized imaging tests: Doctors may use specialized imaging tests used primary to examine the bile ducts. These include:
  • Endoscopic retrograde cholangiopancreatography (ERCP), which is a technique combines endoscopy with x-rays.
  • Percutaneous transhepatic cholangiography (PTC), which is a technique that utilizes a special dye injected into the bile ducts to enable the doctor to better see the bile ducts on x-ray.
• Liver biopsy: A small sample of liver tissue is taken for microscopic examination to confirm the diagnosis and assess the extent of liver damage.
• Transient elastography: This test measures liver stiffness and can help provide information about the extent of fibrosis of the liver, which may occur as a complication of PSC.

Each case is unique and your healthcare provider will recommend specific examinations, tests, and procedures based on your individual situation. It's important to follow up with your healthcare provider if your symptoms worsen or change after the initial evaluation.

Treatment Options

The goals of treatment for primary sclerosing cholangitis are to manage symptoms and prevent complications. Treatment options include:

Medications:

• Ursodeoxycholic acid (UDCA): This helps increase bile flow and reduce itching. It may help slow down liver damage progression.
• Obeticholic acid: This medication helps control bile acid production and flow.
• Bile acid sequestrants: These medications bind to bile acids and may help reduce itching caused by high levels of bile acids.
• Antihistamines: These medications may help reduce itching.

Procedures:

• Balloon dilatation or stents: These approaches are used to open narrowed bile ducts and improve bile flow. In some cases, they are performed during an endoscopic retrograde cholangiopancreatography (ERCP) procedure. In other cases, this may be performed during a surgical procedure.
• Liver transplant: Considered if PSC leads to liver failure.

The effectiveness of these treatments may vary among individuals. Treatment decisions should be individualized based on patient characteristics, goals, concerns, and practical issues. Consult with a healthcare professional about specific medication dosing and potential side effects.