Hepatitis C

Hepatitis C is a viral infection that causes liver inflammation, sometimes leading to serious liver damage. The hepatitis C virus (HCV) spreads through contaminated blood.

Until recently, hepatitis C treatment required weekly injections and oral medications that many HCV-infected people couldn't take because of other health problems or unacceptable side effects.

That's changing. Today, chronic HCV is usually curable with oral medications taken every day for two to six months. Still, about half of people with HCV don't know they're infected, mainly because they have no symptoms, which can take decades to appear. For that reason, the U.S. Centers for Disease Control and Prevention recommends a one-time screening blood test for everyone at increased risk of the infection. The largest group at risk includes everyone born between 1945 and 1965 — a population five times more likely to be infected than those born in other years.

Symptoms 

Symptoms

Long-term infection with the hepatitis C virus (HCV) is known as chronic hepatitis C. Chronic hepatitis C is usually a "silent" infection for many years, until the virus damages the liver enough to cause the signs and symptoms of liver disease. Among these signs and symptoms are:

• Bleeding easily
• Bruising easily
• Fatigue
• Poor appetite
• Yellow discoloration of the skin and eyes (jaundice)
• Dark-colored urine
• Itchy skin
• Fluid buildup in your abdomen (ascites)
• Swelling in your legs
• Weight loss
• Confusion, drowsiness and slurred speech (hepatic encephalopathy)
• Spider-like blood vessels on your skin (spider angiomas).

Every chronic hepatitis C infection starts with an acute phase. Acute hepatitis C usually goes undiagnosed because it rarely causes symptoms. When signs and symptoms are present, they may include jaundice, along with fatigue, nausea, fever and muscle aches. Acute symptoms appear one to three months after exposure to the virus and last two weeks to three months.

Acute hepatitis C infection doesn't always become chronic. Some people clear HCV from their bodies after the acute phase, an outcome known as spontaneous viral clearance. In studies of people diagnosed with acute HCV, rates of spontaneous viral clearance have varied from 14 to 50 percent. Acute hepatitis C also responds well to antiviral therapy.

Causes

Hepatitis C infection is caused by the hepatitis C virus. The infection spreads when blood contaminated with the virus enters the bloodstream of an uninfected person.

Globally, HCV exists in several distinct forms, known as genotypes. The most common HCV genotype in North America and Europe is type 1. Type 2 also occurs in the United States and Europe, but is less common than type 1. Both type 1 and type 2 have also spread through much of the world, although other genotypes cause a majority of infections in the Middle East, Asia and Africa.

Although chronic hepatitis C follows a similar course regardless of the genotype of the infecting virus, treatment recommendations vary depending on viral genotype.

Risk factors

• Are a health care worker who has been exposed to infected blood, which may happen if an infected needle pierces your skin
• Have ever injected or inhaled illicit drugs
• Have HIV
• Received a piercing or tattoo in an unclean environment using unsterile equipment
• Received a blood transfusion or organ transplant before 1992
• Received clotting factor concentrates before 1987
• Received hemodialysis treatments for a long period of time
• Were born to a woman with a hepatitis C infection
• Were ever in prison
• Were born between 1945 and 1965, the age group with the highest incidence of hepatitis C infection

Your risk of hepatitis C infection is increased if you:

Complications

Hepatitis C infection that continues over many years can cause significant complications, such as:

• Scarring of the liver (cirrhosis). After 20 to 30 years of hepatitis C infection, cirrhosis may occur. Scarring in your liver makes it difficult for your liver to function.
• Liver cancer. A small number of people with hepatitis C infection may develop liver cancer.
• Liver failure. Advanced cirrhosis may cause your liver to stop functioning.

Diagnosis

Screening for hepatitis C

Health officials recommend that anyone at high risk of exposure to HCV get a blood test to screen for hepatitis C infection. People who may want to talk to their doctors about screening for hepatitis C include:

• Anyone who has ever injected or inhaled illicit drugs
• Anyone who has abnormal liver function test results with no identified cause
• Babies born to mothers with hepatitis C
• Health care and emergency workers who have been exposed to blood or accidental needle sticks
• People with hemophilia who were treated with clotting factors before 1987
• People who have ever undergone long-term hemodialysis treatments
• People who received blood transfusions or organ transplants before 1992
• Sexual partners of anyone diagnosed with hepatitis C infection
• People with HIV infection
• Anyone born from 1945 to 1965
• Anyone who has been in prison

Other Blood Tests:

If an initial blood test shows that you have hepatitis C, additional blood tests will:

• Measure the quantity of the hepatitis C virus in your blood (viral load)
• Identify the genotype of the virus.

Tests for liver damage

Doctors typically use one or more of the following tests to assess liver damage in chronic hepatitis C.

• Magnetic resonance elastography (MRE). A noninvasive alternative to a liver biopsy (see below), MRE combines magnetic resonance imaging technology with patterns formed by sound waves bouncing off the liver to create a visual map showing gradients of stiffness throughout the liver. Stiff liver tissue indicates the presence of fibrosis, or scarring of the liver, as a result of chronic hepatitis C.
• Transient elastography. Another noninvasive test, transient elastography is a type of ultrasound that transmits vibrations into the liver and measures the speed of their dispersal through liver tissue to estimate its stiffness.
• Liver biopsy. Typically done using ultrasound guidance, this test involves inserting a thin needle through the abdominal wall to remove a small sample of liver tissue for laboratory testing.

Treatment 

Antiviral medications

Hepatitis C infection is treated with antiviral medications intended to clear the virus from your body. The goal of treatment is to have no hepatitis C virus detected in your body at least 12 weeks after you complete treatment.

Researchers have recently made significant advances in treatment for hepatitis C using new, "direct-acting" anti-viral medications, sometimes in combination with existing ones. As a result, people experience better outcomes, fewer side effects and shorter treatment times — some as short as eight weeks. The choice of medications and length of treatment depend on the hepatitis C genotype, presence of existing liver damage, other medical conditions and prior treatments.

Due to the pace of research, recommendations for medications and treatment regimens are changing rapidly. It is therefore best to discuss your treatment options with a specialist.

Throughout treatment your care team will monitor your response to medications.

Liver transplantation.

If you have developed serious complications from chronic hepatitis C infection, liver transplantation may be an option. During liver transplantation, the surgeon removes your damaged liver and replaces it with a healthy liver. Most transplanted livers come from deceased donors, though a small number come from living donors who donate a portion of their livers.

In most cases, a liver transplant alone doesn't cure hepatitis C. The infection is likely to return, requiring treatment with antiviral medication to prevent damage to the transplanted liver. Several studies have demonstrated that new, direct-acting antiviral medication regimens are effective at curing post-transplant hepatitis C. Treatment with direct-acting antivirals can also be effective in appropriately selected patients before liver transplantation.

Vaccinations

Although there is no vaccine for hepatitis C, your doctor will likely recommend that you receive vaccines against the hepatitis A and B viruses. These are separate viruses that also can cause liver damage and complicate the course of chronic hepatitis C.

Source :http://www.mayoclinic.org/