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Drugs and diseases reference index

Drugs and diseases reference index
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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «H»:

  1. Hydrocele Hydrocele
    Hydrocele: Accumulation of fluid in the coat around the testis. Small hydroceles tend to disappear by a year of age while larger hydroceles may persist and warrant surgery. ...
  2. Hydrocephalus Hydrocephalus
    Hydrocephalus: Hydrocephalus is an abnormal buildup of cerebrospinal fluid (CSF) in the ventricles of the brain. The fluid is often under increased pressure and can compress and damage the brain. Hydrocephalus can arise before birth or any time afterward. It may be due to many causes including a...
  3. Hydrocephalus ex-vacuo Hydrocephalus ex-vacuo
    Hydrocephalus ex-vacuo: What is termed "hydrocephalus ex-vacuo" occurs when there is damage to the brain caused by stroke or injury, and there may be an actual shrinkage of brain substance. Although there is more CSF than usual, the CSF pressure itself is normal in hydrocephalus ex-vacuo. Hydroceph...
  4. Hydrocephalus, acquired Hydrocephalus, acquired
    Hydrocephalus, acquired: Hydrocephalus due to a postnatal cause, something that happened sometime after birth....
  5. Hydrocephalus, communicating Hydrocephalus, communicating
    Hydrocephalus, communicating: Hydrocephalus in which there is no obstruction to the flow of the cerebrospinal fluid (CSF). Specifically, there is no obstruction within the ventricular system of the brain or where the CSF passes into the spinal canal. By process of elimination, the hydrocephalus is d...
  6. Hydrocephalus, congenital Hydrocephalus, congenital
    Hydrocephalus, congenital: Hydrocephalus present at birth....
  7. Hydrocephalus, Macewen sign of Hydrocephalus, Macewen sign of
    Hydrocephalus, Macewen sign of: A sign to detect hydrocephalus (and brain abscess). Percussion (tapping) on the skull at a particular spot (near the junction of the frontal, temporal and parietal bones) yields an unusually resonant sound in the presence of hydrocephalus or a brain abscess. ...
  8. Hydrocephalus, normal pressure Hydrocephalus, normal pressure
    Hydrocephalus, normal pressure: See: Normal pressure hydrocephalus....
  9. Hydrocephaly Hydrocephaly
    Hydrocephaly: Also known as hydrocephalus, this is an abnormal buildup of cerebrospinal fluid (CSF) in the ventricles of the brain. The fluid is often under increased pressure and can compress and damage the brain. Hydrocephalus can arise before birth or any time afterward. It may be due to man...
  10. Hydrogen Hydrogen
    Hydrogen: The most plentiful element in the universe and one present in all organic compounds. Hydrogen is a gas with an atomic number of 1 and the symbol H. Two isotopes of hydrogen -- deuterium and tritium -- have been used as tracers in metabolic studies. Tritium is a long-lived weak emitter of ...
  11. Hydrogen cyanide Hydrogen cyanide
    Hydrogen cyanide: See: Cyanide....
  12. Hydronephrosis Hydronephrosis
    Hydronephrosis: Distention of the kidney with urine. Due to obstruction of urine outflow (for example, by a stone blocking the ureter, the tube going from the kidney to the bladder). ...
  13. Hydrophobia Hydrophobia
    Hydrophobia: 1. Literally, an irrational fear of water, to drink or to swim in. Someone who is scared of the water is hydrophobic. 2. A term once commonly used for rabies because in the later stages of that disease, the animal (or person) has difficulty swallowing and so fears a drink of water. Fro...
  14. Hydrops fetalis Hydrops fetalis
    Hydrops fetalis: Gross edema (swelling), usually with anemia, of the fetus. It can be due to Rh blood group incompatibility, in which antibodies crossing the placenta from the mother destroy the red blood cells of the fetus. It can also be caused by a lethal form of the genetic disorder thalas...
  15. Hydrostatic weighing Hydrostatic weighing
    Hydrostatic weighing: See: Underwater weighing....