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Hepatitis C
The Liver
The liver is the largest organ in the body. It is found high in the
right upper abdomen, behind the ribs. It is a very complex organ and
has many functions. They include:
- Storing energy in the form of sugar (glucose)
- Storing vitamins, iron, and other minerals
- Making proteins, including blood clotting factors, to keep the
body healthy and help it grow
- Processing worn out red blood cells
- Making bile which is needed for food digestion
- Metabolizing or breaking down many medications and
alcohol
- Killing germs that enter the body through the intestine
The liver shoulders a heavy work load for the body, and almost
never complains. It even has a remarkable power to regenerate itself.
Still it should not be taken for granted. The liver is subject to
illnesses, such as hepatitis B, which may lead to serious liver
damage.
What is Hepatitis?
When cells in the body are injured by such things as chemicals or
infection, the area that is hurt becomes inflamed. Hepatitis is
inflammation of the liver, which in turn causes damage to individual
liver cells. It is most often caused by viral infection. However, it
can also be caused by alcohol, certain drugs, chemicals or poisons,
or other diseases.
Hepatitis may be either acute or chronic. In acute hepatitis the
inflammation develops quickly, and lasts only a short period of time.
The patient usually recovers completely, but it can take up to
several months. Occasionally, a person fails to recover fully, and
the hepatitis becomes chronic. In other words, it continues at a
smoldering pace. Chronic hepatitis can develop over a number of years
without the patient ever having acute hepatitis or even feeling sick.
As the liver repairs itself, fibrous tissue develops, much like a
scar forms after a cut or injury to the skin heals. Advanced scarring
of the liver is called cirrhosis. Over time, cirrhosis irreversibly
damages the liver, eventually ending in liver failure.
What is Hepatitis C?
Hepatitis C is caused by a virus (medically abbreviated as HCV). This
type of viral hepatitis is different from the others in an important
way. All patients with hepatitis A and most with hepatitis B develop
an acute infection, recover completely, and develop antibodies that
protect them from ever getting the disease again. However, the
hepatitis C virus is a "quick-change" artist. Once inside the body,
it changes its form to evade discovery and attack by the immune
system. Scientists have already identified many forms of HCV, and
patients infected with one type are not necessarily safe from other
types. Hepatitis C patients do develop antibodies, but they are not
curative or protective as in hepatitis A or B. Hepatitis C antibodies
may not completely rid the body of the virus. Therefore, most people
infected with the HCV virus will develop chronic hepatitis.
Current
estimates are that 3.5 million Americans carry the virus that causes
hepatitis C, and 150,000 people become infected with HCV each year.
This virus is known to be spread through infected blood, blood
products, and needles. Prior to the late 1980s, people were most at
risk for contracting the disease through blood transfusions. However,
a blood test was developed at that time to detect the virus, and the
blood supply is now always tested to prevent spread of the disease in
this way. Even so, there is a very slight risk for those who must
receive blood products on a regular basis, such as hemophiliacs and
patients on hemodialysis. Health care workers are also at risk. At
this time, the people most at risk for getting hepatitis C are IV
drug users who share needles. There are also a larger number of cases
among east Asians. In about 40% of all cases of hepatitis C, it is
unknown how the patient was infected with the virus. This situation
is known as community acquired disease.
Symptoms and Diagnosis
Most patients with hepatitis C do not have symptoms. This is
especially true early in the disease. If there are symptoms, they are
usually mild and flu-like -- perhaps nausea and fatigue. It can take
from 2 to 26 weeks for the disease to develop once the patient is
infected with HCV. Routine blood tests will show an elevation in
certain liver enzymes, especially one called the ALT. The physician
can then order a specific blood test to determine if the patient has
hepatitis C.
Chronic Hepatitis C
Hepatitis C is a cause for concern for two reasons. First, most cases
become chronic. Second, patients seldom become acutely ill, so it is
possible for them to have the disease for some time before it is
diagnosed. Late in the disease, fatigue may become increasingly
severe. If cirrhosis has developed, other more serious symptoms may
occur. However, the elevation in the blood ALT may not correlate with
the degree of liver inflammation. In other words, a high ALT may not
necessarily mean there is a serious degree of inflammation.
Conversely, a low or normal blood ALT level may be present even
though there is chronic liver damage. For this reason, a liver biopsy
is almost always required to determine how serious the disease may
be. Under local anesthesia, a slender needle is inserted into the
right lower chest. A small piece of liver tissue is taken out with
the needle and examined under a microscope. A biopsy can show if
cirrhosis is present and how far it has progressed. It is believed
that about 20% of the patients with chronic hepatitis C will develop
cirrhosis, and a few of those will go on to develop liver cancer. It
may take from 10 to 40 years for serious liver damage to occur.
Treatment
Both the patient and physician have a role in treating hepatitis C. It is now known that alcohol use, even in socially accepted amounts, makes the liver disease worse. So while the virus is present in the body, it is best to avoid alcohol altogether. Patients should also discuss the use of over-the-counter medicines with the physician. Some drugs such as acetaminophen (Tylenol) that may not be normally toxic can worsen liver damage in HCV. Of course, a healthy diet is always important. The patient will also want to discuss vaccination against hepatitis viruses A and B. If a person with HCV becomes infected with either of these other viruses, the outcome could be quite severe. The patient should be careful to avoid the possibility of getting these other diseases. This means no IV drugs or unprotected sex with a new partner with unknown sexual activity history.
Now to medicines. As of 1999, there are two programs available to treat HCV. One is the use of interferon (IFN) by itself. IFN is a synthetic form of a substance the body naturally produces to fight infections and strengthen the immune system. There are some bothersome side effects with the drug, such as fatigue and flu-like symptoms following each injection. Usually, interferon is injected three times a week for at least six months and often for a year. The second treatment is to combine IFN with an oral medication called ribavirin. This is particularly helpful in treating those patients who have not responded to IFN alone. A side effect of ribavirin is a mild anemia or low red cell count in the blood.
HCV Carriers
Certain people infected with HCV have a positive HCV blood test, but
a normal liver enzyme test. These individuals are often called HCV
carriers, and they can pass the virus on to others. Although they
appear not to be seriously ill, there is recent evidence that even
these people may have chronic hepatitis. Therefore, each should be
evaluated by a liver specialist.
Sex and Pregnancy
The risk of transmitting HCV sexually is low compared to hepatitis B
and AIDS. In marriages and long-term relationships with monogamous
partners, it is often the case that one person is HCV positive and
the partner is HCV negative. The current medical recommendation is
that in these circumstances, sexual practices need not be changed.
However, when people have multiple sex partners or new partners, they
should never engage in unprotected sex.
It appears that in pregnancy, HCV is passed on to the fetus less
than 5% of the time. It may depend on how high the mother's blood
virus level is during pregnancy. Therefore, hepatitis C infected
women should always consult with their physicians before becoming
pregnant.
Prevention
|There is no vaccine currently available to protect against hepatitis
C, as there is with hepatitis A and hepatitis B. People can prevent
getting hepatitis C by not sharing anything that is likely to hold
and transmit blood -- razors, manicure tools, toothbrushes, and
especially IV drug needles. Practices such as ear piercing and
tattooing should be avoided in places where sterile conditions are
questionable. Until all circumstances under which HCV can be
transmitted have been thoroughly identified, it should be assumed
that every person with hepatitis C can pass the virus on to others.
Therefore everyone, especially health care workers, should avoid
coming in contact with blood and body fluids from infected
individuals.
Liver Transplantation
Liver transplantation is a newer, successful form of therapy for
people with a badly damaged liver. Liver transplants have become more
common for people with chronic hepatitis C who develop
life-threatening liver damage. However, since these patients continue
to carry the virus, they will almost always reinfect their new
livers. Nevertheless, with continuing treatment for the chronic
infection, liver transplantation offers these patients longer life
and improved quality of life.
Summary
Hepatitis C is a serious disease that often results in long-term
complications. Many patients infected with HCV develop chronic
hepatitis C. Some people become carriers of HCV without knowing it.
For this reason it is important to prevent spread of the disease by
lifestyle practices that avoid contact with infected blood and body
fluids. Researchers are continually learning more about hepatitis C,
and research into new treatments is ongoing. Chronic hepatitis C
patients who are monitored frequently and follow the advice of their
physicians have every reason to be hopeful about the future.
Related Diseases
Hepatitis
| Cirrhosis
Related Procedures
Liver
Biopsy | Liver
Transplant
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This material does not cover all information and is
not intended as a subsitute for professional care. Please consult
with your physician on any matters regarding your health.
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Copyright
Chek Med Systems®, Inc., All Rights Reserved.
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