Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Hepatic encephalopathy: Brain dysfunction directly due to liver dysfunction, most often recognized in advanced liver disease. Hepatic encephalopathy may cause disturbances of consciousness and progress to coma.
Hepatic encephalopathy is sometimes said to be synonymous with hepatic coma but this is i...
Hepatic hemangioma: A common benign tumor of the liver made up of small blood vessels. It is 4-6 times more common in women than men. These tumors are usually small, a quarter inch (less than 1 cm) in diameter, cause no problems and are discovered incidentally in the course of testing for an unrelat...
Hepatic transplant: See: Liver transplant....
Hepatic vein: One of the veins which drains blood from the liver....
Hepatico-: A combining form used before a consonant to indicate a relationship to a hepatic duct or the liver. From the Greek hepar meaning liver....
Hepatitis: Inflammation of the liver from any cause.
Hepatitis is most often viral, due to infection with one of the hepatitis viruses (A, B, C, D, and E) or another virus (such as those that cause infectious mononucleosis, cytomegalovirus disease, or yellow fever). The main nonviral causes of hepa...
Hepatitis A: Inflammation of the liver caused by the
hepatitis A virus (HAV). HAV is usually transmitted from person to person by food or drink that has been contaminated with the stool of a person with hepatitis A. This type of transmission is called "fecal-oral." The virus is more easily spread i...
Hepatitis A immunization
Hepatitis A immunization: When immediate protection
against hepatitis A (infectious hepatitis) is needed, immunoglobulins are used. Protection
is effective only if given within 2 weeks of exposure and lasts but 2-4 months.
Immunoglobulins can be used to protect household contacts of someone with acu...
Hepatitis B: Inflammation of the liver due to the
hepatitis B virus (HBV), once thought to be passed only through blood
products. It is now known that hepatitis B can also be transmitted
via needle sticks, body piercing and tattooing using un sterilized
instruments, the dialysis process, sexual ...
Hepatitis B immunization
Hepatitis B immunization: Hepatitis B (hep B) vaccine
gives prolonged protection, but 3 shots over a half year are usually required. In the
U.S., all infants receive hep B vaccine. Two vaccines (Energix-B, and Recombivax-HB) are
available in the US. The first dose of hep B vaccine is frequently give...
Hepatitis C: Inflammation of the liver due to the
hepatitis C virus (HCV), which is usually spread by blood
transfusion, hemodialysis, and needle sticks. HCV causes most
transfusion-associated hepatitis, and the damage it does to the liver
can lead to cirrhosis and cancer. Transmission of the ...
Hepatitis C virus
Hepatitis C virus: A single-stranded RNA virus in the Flaviviridae family that causes hepatitis C. Abbreviated HCV. The HCV genome contains some 10,000 nucleotides and encodes a single polyprotein of 3,000 amino acids. HCV was discovered in 1989. Before that time, hepatitis C was referred to as non-...
Hepatitis D: Liver inflammation due to the
hepatitis D virus (HDV), which only causes disease in
patients who already have the hepatitis B virus.
Transmission is via infected blood, needles, or sexual
contact with an infected person. Symptoms are identical to
those of hepatitis B. Chronic infec...
Hepatitis D, E, F, and G
Hepatitis D, E, F, and G: Lesser known (than hepatitis
A, B, and C), the most significant of these seems to be type D, or the delta agent, which
only causes disease in the presence of the hepatitis B virus....
Hepatitis E: A form of liver disease characterized by inflammation of the liver due to infection with the hepatitis E virus (HEV). Usually a mild disease, hepatitis E but can in rare cases prove fatal, particularly in pregnant women.
HEV is transmitted via food or drink that has been handled by an...