Category: H

  • Hostile work environment

    Place of employment in which a reasonable person would find conditions that are abusive or intolerable. Prohibited conduct may take place repeatedly and may include physical intimidation; sexual harassment; or political, racial, religious, or sex-based discrimination.  

  • High-speed engine

    A machine that rotates a dental instrument in excess of 12,000 rpm.  

  • High enema

    An enema designed to reach most of the colon. A rubber tube is inserted into the rectum to carry water as far as possible.  

  • Hypoxic encephalopathy

    The neurological damage that results from depriving the brain of oxygen or blood, or both, for several minutes. The damage may range from a transient loss of short-term memory to persistent vegetative coma. Many conditions can result in an oxygen deficiency in the brain, which is acutely dependent on oxygen, blood, and glucose to work…

  • Herpetic encephalitis

    Encephalitis caused by infection of the brain with herpes simplex virus- 1 (or, less often, herpes simplex virus-2). This relatively common form of encephalitis typically involves the inferior surfaces of the temporal lobes and may cause hemorrhagic necrosis of brain tissue. It is fatal in at least one third of all cases. Acyclovir (or one…

  • Hemorrhagic encephalitis

    Herpes encephalitis in which there is hemorrhage along with brain inflammation.  

  • Hereditary Elliptocytosis

    An inherited condition in which the red blood cells are oval or elliptical. This anomaly occurs in about 1 in every 2000 births.  

  • Hydrogen electrode

    An electrode that absorbs and measures hydrogen gas; used as the reference for pH measurement in research laboratories.  

  • High-altitude pulmonary edema

    Pulmonary edema that may occur in aviators, mountain climbers, or anyone exposed to decreased atmospheric pressure.  

  • Hypostatic ectasia

    Dilatation of a blood vessel from the pooling of blood in dependent parts, especially the legs.