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Drugs and diseases reference index

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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «L»:

  1. Laryngoscopy Laryngoscopy
    Laryngoscopy: Examination of the larynx with a mirror (indirect laryngoscopy) or with a laryngoscope (direct laryngoscopy). The laryngoscope is a flexible, lighted tube used to look at the inside of the larynx (the voice box). The laryngoscope is inserted through the mouth into the upper airway....
  2. Laryngostasis Laryngostasis
    Laryngostasis: More commonly known as croup, this is an infection of the larynx, trachea, and the bronchial tubes, that occurs mainly in children. It is usually caused by viruses, less often by bacteria. Symptoms include a cough that sounds like a barking seal and a harsh crowing sound during i...
  3. Laryngotomy Laryngotomy
    Laryngotomy: Surgical opening of the larynx, the voice box....
  4. Larynx Larynx
    Larynx: The larynx is the portion of the breathing, or respiratory, tract containing the vocal cords which produce vocal sound. It is located between the pharynx and the trachea. The larynx, also called the voice box, is a 2-inch-long, tube-shaped organ in the neck. We use the larynx when we breath...
  5. Larynx transplant Larynx transplant
    Larynx transplant: A transplant of the larynx, or voicebox. This procedure permits a human-sounding voice with inflection, range, and qualities unique to the patient, and normal swallowing. The risks of the procedure include those of organ rejection and immunosuppression therapy....
  6. Laser Laser
    Laser: A powerful beam of light that can produce intense heat when focused at close range. Lasers are used in medicine in microsurgery, cauterization, for diagnostic purposes, etc. For example, lasers are employed in microsurgery to cut tissue and remove tissue. Technical Note: A laser concentrates ...
  7. Laser coagulation Laser coagulation
    Laser coagulation: The coagulation (clotting) of tissue using a laser. A coagulation laser produces light in the visible green wavelength that is selectively absorbed by hemoglobin, the pigment in red blood cells, in order to seal off bleeding blood vessels. There is also, for example, electrocoagu...
  8. Laser surgery Laser surgery
    Laser surgery: A type of surgery that uses the cutting power of a laser beam to make bloodless cuts in tissue or remove a surface lesion such as a skin tumor. There are a number of different types of lasers that differ in emitted light wavelengths and power ranges and in their ability to clot, cut, ...
  9. Laser surgery, YAG Laser surgery, YAG
    Laser surgery, YAG: The use of a YAG (yttrium-aluminum-garnet) laser to do surgery. One use for a YAG laser in surgery is to punch a hole in the iris to relieve increased pressure within the eye from acute angle-closure glaucoma. In this type of glaucoma, there is a sudden (acute) increase in pres...
  10. Laser, argon Laser, argon
    Laser, argon: See: Argon laser....
  11. Laser, excimer Laser, excimer
    Laser, excimer: See: Excimer laser....
  12. Laser-assisted in situ keratomileusis Laser-assisted in situ keratomileusis
    Laser-assisted in situ keratomileusis: A kind of laser eye surgery designed to change the shape of the cornea to eliminate or reduce the need for glasses and contact lenses in cases of severe myopia (nearsightedness). The procedure is best known as LASIK, an acronym for laser-assisted in situ ker...
  13. LASIK LASIK
    LASIK: Abbreviation standing for laser-assisted in situ keratomileusis, a kind of laser eye surgery designed to change the shape of the cornea to eliminate or reduce the need for glasses and contact lenses in cases of severe myopia (nearsightedness). Before LASIK, the most common form of laser ey...
  14. Lassa fever Lassa fever
    Lassa fever: An acute viral infection found in the tropics, especially in West Africa. Epidemics of Lassa fever have occurred in countries such as Sierra Leone, Congo (formerly Zaire), Liberia and Nigeria. The disease was discovered in 1969 when two missionary nurses died of it in the village ...
  15. Lassa virus Lassa virus
    Lassa virus: The deadly cause of Lassa fever. Lassa virus is a virulent and highly transmissible RNA virus that belongs to the arenavirus group. Lassa virus was discovered in 1969 by a team led by Dr. Jordi Casals-Ariet. See also: Lassa fever; and Casals-Ariet, Jordi....