Autoimmune hepatitis (AIH) affects 100,000 to 200,000 people in the United States, accounting for 6% of liver transplants, according to the National Digestive Diseases Information Clearinghouse. It's a form of hepatitis in which an individual's immune system attacks his or her liver.
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Approximately 78% of those with AIH are women, and it occurs in all ethnic groups. The frequency of AIH among patients with chronic liver disease in North America is between 11% and 23%. Without treatment, AIH can lead to cirrhosis, liver failure, and death.
In this article, we'll discuss the management of a patient with AIH.
Regardless of the underlying cause, hepatitis can affect the liver's ability to carry out vital functions, including controlling and storing proteins, fats, carbohydrates, vitamins, and minerals; making proteins and clotting factors; and producing bile. The liver also regulates hormones and filters poisons, bacteria, toxins, and medications from the blood.
The word hepatitis is a general term that refers to any inflammation of the liver caused by many underlying pathologies. Inflammation is followed by a disruption in normal blood flow through the liver (ischemia), leading to necrosis.
Hepatitis is most frequently caused by a virus, particularly hepatitis A virus (HAV), hepatitis B virus (HBV), and hepatitis C virus (HCV). Although HAV is generally self-limiting and has a good prognosis, HBV and HCV-affecting 1.2 million and 3.2 million Americans, respectively-may progress to hepatic fibrosis (scarring), especially without aggressive treatment.
Fibrosis is a mechanism for the liver to repair itself from the effects of inflammation. However, depending on the stage, fibrosis may further impair blood flow through the liver, leading to cirrhosis, which occurs when there's excessive scarring that reduces blood supply, resulting in liver failure.
Nonviral causes of hepatitis include nonalcoholic fatty liver disease, alcoholic hepatitis, toxin-induced hepatitis, drug-induced hepatitis, and AIH. Viral and nonviral causes of hepatitis can lead to fibrosis, cirrhosis, and liver failure, increasing the patient's risk of hepatic carcinoma.
Let's take a closer look at AIH, which is caused by an overactive immune system.
How it happens
AIH is a disease in which a person's own immune system attacks liver cells, leading to inflammation. The immune system overacts and the body incorrectly identifies the liver as foreign (not belonging to the body). When this occurs, the immune system produces protective antibodies (autoantibodies) that attack the "enemy" organ. AIH may coexist with other autoimmune disorders (see Diseases associated with AIH).
Certain human leukocyte antigens (HLAs) found on chromosome number 6 may predispose a person to AIH. These antigens are HLA-DR3 and HLA-DR4. Researchers posit that a cascade of T cell-mediated events is triggered in AIH, leading to progressive inflammation and fibrosis of the liver.
The measles virus, hepatitis viruses, cytomegalovirus, and Epstein-Barr virus may be potential triggers in genetically predisposed individuals. However, these suspected triggers remain controversial among researchers, and the evidence implicating hepatitis viruses is weak.
Some medications, including, but not limited to, methyldopa, isoniazid, and phenytoin, and some herbs can cause liver injury that mimics AIH.
AIH is classified as type 1, type 2, or type 3.
* Type 1 is the most common form of AIH and can occur at any age. About 50% of these patients have other autoimmune diseases. It's characterized by two autoantibodies: antinuclear antibody (ANA) and smooth muscle antibody (SMA).
* Type 2 is most common among young women and girls, and often occurs with other autoimmune disorders. Patients with type 2 AIH have the liver kidney microsomal antibody.
* Type 3 is diagnosed when a patient doesn't initially present with autoantibodies but may have other histologic (liver biopsy) or lab evidence and signs and symptoms that meet the criteria for a diagnosis of AIH. This occurs in about 20% of patients with AIH, who usually develop autoantibodies during the course of the disease.
Signs and symptoms checklist
The onset of AIH most often begins with insidious symptoms, such as fatigue, joint aches, loss of appetite, and malaise. In fact, these symptoms may be so subtle that the patient doesn't seek medical care. Some individuals only experience a vague feeling of abdominal discomfort; however, increasing fatigue, the onset of jaundice, and changes in stool color are the most common reasons for seeking medical care in 80% of AIH cases.
Jaundice arises late and may follow several months of nonspecific symptoms. The jaundice phase includes yellowing of the eyes (sclera), mucous membranes, and skin; dark urine; and light to pale color stools. It correlates with a rising serum bilirubin level. As the disease progresses, the serum albumin level may decrease as the serum bilirubin rises.
The patient may also experience a low-grade fever, nausea, muscle aches and pains, and abdominal discomfort and/or pain. Jaundice tends to cause itching because of bile salts on the skin. Enlargement of the liver (hepatomegaly) may or may not be present, especially in the early stages of AIH.
The only way to differentiate one type of hepatitis from another is through lab analysis and liver biopsy-the gold standard for a diagnosis of AIH.
Increased serum globulins (protein), the presence of autoantibodies, negative viral hepatitis markers, and increased liver enzymes point toward a diagnosis of AIH. In fact, severe AIH usually, but not always, results in alanine aminotransferase (ALT) and aspartate transaminase (AST) levels 7 to 10 times the upper limit of normal (see Assessing selected liver function tests).
A liver biopsy is essential for a diagnosis of AIH. A classic finding in AIH is interface hepatitis-the infiltration of lymphocytes and plasma cells that causes inflammation throughout the hepatic parenchyma (bulk of the functioning liver) to the portal tracts (connective tissue containing branches of the portal vein and hepatic artery that bring blood to the sinusoids). Interface hepatitis may also occur in liver injury induced by drugs or viruses; however, some differences exist. For example, severe portal inflammation, prominent plasma cells, and fibrosis differentiate AIH from drug- and/or medication-induced hepatitis.
The liver biopsy also classifies the severity of fibrosis into five stages:
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|Table Assessing selected liver function tests|
* stage 0-no fibrosis
* stage 1-mild fibrosis
* stage 2-moderate fibrosis
* stage 3-severe fibrosis, sometimes called precirrhosis
* stage 4-severe fibrosis with cirrhosis.
A diagnosis of AIH is based on a careful evaluation of histologic (liver biopsy) findings, abnormal levels of serum globulins (proteins), the presence of autoantibodies and elevated liver enzymes, and patient history. Patient assessment includes an evaluation of preexisting physical conditions, medications, and social history of alcohol consumption, use of illicit drugs, and any exposure to blood and body fluids of others.
The International Autoimmune Hepatitis Group diagnostic criteria are used to establish a diagnosis of AIH. Simplified scoring criteria are also used by some healthcare professionals to diagnosis AIH. However, this simplified scoring needs more evidence-based research to ensure that it measures the scope of symptoms to establish a definitive diagnosis of AIH.
The goal of treatment is to stop the body's attack on the liver by suppressing the immune system. The standard medication therapy for AIH is the administration of corticosteroids, such as prednisone, and the steroid-sparing immunosuppressant azathioprine. Prednisone is gradually decreased over a period of 4 to 8 weeks in parallel to an improvement of liver enzymes. Caution is necessary with the use of azathioprine because it can cause hepatotoxicity (see Standard first-line medication therapy for AIH). Other medications that may be used include the second-generation corticosteroid budesonide and the steroid-sparing immunosuppressant mycophenolate mofetil (MMF).
It's imperative to ensure that the patient's symptoms result from AIH and not viral hepatitis before starting treatment. For example, if a patient is suspected of having AIH but he or she actually has viral hepatitis, the administration of prednisone will harm the patient by increasing viral replication. On the other hand, if a patient is suspected of having viral hepatitis but he or she actually has AIH, the administration of antiviral agents places the patient at greater risk for liver failure.
|Table Standard first-line medication therapy for AIH|
AIH tends to be a chronic disorder that's characterized by periods of remission (symptoms controlled) and relapses (worsening of symptoms). However, AIH usually responds well to therapy. In fact, a patient's dramatic improvement with immunosuppressive therapy is one diagnostic feature of AIH. Approximately 80% of patients achieve remission within 18 months of starting therapy.
Early diagnosis and treatment is crucial to control inflammation and reduce fibrosis before the disease progresses to cirrhosis. The liver has an amazing ability to heal itself, especially in the early stages of fibrosis. It isn't likely that fibrosis will be reversed after cirrhosis is present. Cirrhosis can lead to portal hypertension, ascites, and hepatic encephalopathy. A liver transplant is the only option at this point to save the patient's life.
Let's take a look at a case study to illustrate the diagnosis and treatment of AIH.
Our patient is a 54-year-old man with a 15-year history of systemic lupus erythematosus (SLE), which has manifested itself in the central nervous system, peripheral nervous system, and the patient's skin. Immunosuppressant medications were prescribed to keep the SLE under control. Liver enzymes were routinely monitored every 4 months to detect any changes in disease processes and/or toxic effects of medications, including azathioprine and MMF, on the liver.
Trended liver enzyme results over a 15-year period were generally within normal range, with occasional very slight elevations that quickly returned to normal in subsequent checkups. However, the ALT and AST values increased dramatically over a 4-week period, indicating an immune attack on the patient's liver.
The patient didn't feel ill as the immune attack unfolded, but did experience a vague feeling of abdominal fullness that didn't prevent him from normal physical activities. He also experienced a 2-day episode of a "stomach bug" that included a low-grade fever and light-yellow color stools.
The patient returned to the rheumatologist within a few days of recovering from the "stomach bug" to recheck the liver enzymes-ALT was 127; AST, 59; and alkaline phosphatase (ALP), 137. He had no hepatomegaly or jaundice. A viral hepatitis profile and computed tomography (CT) scan of the abdomen were negative. Azathioprine (50 mg/day) was held to rule out any toxic effects of this medication on the liver, but MMF (1,000 mg/day) was continued.
Within a week, the ALT and AST levels critically increased to 3,345 U/L (50 X upper normal) and 1,100 U/L, respectively. The ALP level was only slightly elevated at 154 U/L. Serum bilirubin was increasing and serum albumin decreasing, indicating that severe liver damage was unfolding, which would likely lead to liver failure (see supplemental content on the Nursing made Incredibly Easy! iPad app).
The patient also had a positive test for ANA and C-reactive protein, and a decrease in serum complement-indicators of inflammation. Serum creatinine was increasing, which indicated that the inflammation was extending from the liver to the kidneys. The patient didn't feel or look ill, but was subsequently hospitalized.
A hepatologist joined the rheumatologist in the patient's care during the 4-day hospital stay. A repeat viral hepatitis profile was negative, and the patient's medication and social history were ruled out as possible causes for the elevated liver enzymes. A preliminary diagnosis of AIH was made.
It was thought that the patient's current immunosuppressive medications were causing the globulin levels to be depressed, whereas they're usually elevated in AIH. He underwent a CT-guided liver biopsy with procedural sedation. The pathology report showed extensive interface hepatitis with prominent plasma cells, moderate-to-severe inflammation, and at least stage 2 fibrosis. The bile ducts weren't affected.
A final diagnosis was made: SLE-induced AIH. A diagnosis of AIH was atypical in this patient because of his gender and that he developed the disease while receiving immunosuppressant medications for SLE. The patient met the criteria for a definitive diagnosis of AIH before starting medication therapy (see supplemental content on the Nursing made Incredibly Easy! iPad app).
Additional immunosuppression was imperative to save the patient's liver from failing. The patient received an infusion of 1,000 mg of methylprednisolone, followed by prednisone (40 mg/day). The rheumatologist tapered the prednisone over several months to correlate with an improvement in liver enzymes. Increasing doses of azathioprine and MMF were included to allow a lower dose of prednisone. The patient was also placed on monthly infusions of belimumab, a monoclonal antibody that was approved by the FDA in 2011 specifically for the treatment of SLE (see supplemental content on the Nursing made Incredibly Easy! iPad app).
The patient will likely be on medication therapy for the rest of his life. The current regimen of low-dose prednisone with azathioprine and MMF is working well. It's hopeful that the prednisone will be discontinued and a lower dose of azathioprine and MMF will maintain remission. A second liver biopsy may be performed at some point to determine if there's histologic improvement.
Receiving a diagnosis of AIH can cause your patient to experience shock, fear, frustration, and anxiety about the uncertainty of the disease. Depression may also occur as your patient attempts to cope with the disease and the effects of medications. Make sure you explain to your patient that prednisone can cause agitation, irritability, distraction, and insomnia and that azathioprine and prednisone also caused easy bruising. Tell your patient that he or she might gain weight while taking prednisone because it causes the body to conserve sodium that leads to fluid retention. The patient in our case study experienced these signs and symptoms, but he actually lost weight, which is atypical while on corticosteroid therapy.
Provide your patient with accurate information about AIH and all forms of hepatitis so he or she can teach others about the diagnosis. The education and nursing care you provide your patient will give him or her confidence to embrace the challenges of coping with chronic illness. The patient in our case report achieved remission in a relatively short time by adhering to the treatment regimen and working alongside his healthcare team.
Unique disease, unique patients
Not all hepatitis is the same, so it's important to distinguish among the various types of hepatitis to manage your patient accurately and safely. Assessing the patient's health and social history, analyzing lab and imaging studies, and collaborating with an interprofessional healthcare team will promote safe care. Teach your colleagues about the similarities and differences among the various types of hepatitis. A diagnosis of AIH is a frightening experience for your patient. Offer him or her reassurance as you provide evidence-based nursing care.
Diseases associated with AIH
* Primary biliary cirrhosis
* Primary sclerosing cholangitis
* Inflammatory bowel disease
* Celiac disease
* Systemic sclerosis (scleroderma)
* Rheumatoid arthritis
* Mixed connective tissue disease
* Sjogren syndrome
* Fibrosing alveolitis
* Hemolytic anemia
* Multiple sclerosis
* Myasthenia gravis
* Mononeuritis multiplex
* Antiphospholipid antibody syndrome
did you know?
AIH was initially known as lupoid hepatitis in the 1950s because of its similarity to SLE. AIH has also been referred to in the literature as chronic active hepatitis.
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On the web
* American Association for the Study of Liver Diseases:http://www.aasld.org/practiceguidelines/Documents/AIH2010.pdf
* American Liver Foundation:http://www.liverfoundation.org/abouttheliver/info/aihep
* Mayo Clinic:http://www.mayoclinic.com/health/autoimmune-hepatitis/DS00676
* National Digestive Diseases Information Clearinghouse:http://digestive.niddk.nih.gov/ddiseases/pubs/autoimmunehep
* U.S. National Library of Medicine:http://www.livertox.nih.gov/Phenotypes_auto.html
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