photodynamic therapy

photodynamic therapy
= PDT; = photoradiation therapy; = phototherapy; = photochemotherapy
1) a treatment for some types of superficial cancers. A light-sensitive agent is injected into the bloodstream and remains in cancer cells for a longer time than in normal cells. Exposure to laser radiation produces an active form of oxygen that destroys the treated cancer cells. The laser radiation can be directed through a fibreoptic bronchoscope into the airways, through a gastroscope into the oesophagus, or through a cystoscope into the bladder. PDT causes minimal damage to healthy tissue, but as it cannot pass through more than about 3 cm of tissue, it is restricted to treating tumours on or just under the skin or on the lining of internal organs. Photodynamic therapy makes the skin and eyes sensitive to light for six weeks or more after treatment.
2) a treatment for wet age-related macular degeneration that involves the intravenous injection of a light-sensitive agent, which passes to the abnormal leaking blood vessels in the retina. The agent is activated when a cold laser light is directed at the macula, sealing the abnormal vessels and thus preventing further leakage and macular damage. The effect is to limit visual loss and stabilize vision.

The new mediacal dictionary. 2014.

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  • PhotoDynamic Therapy — La Photo Dynamic Therapy est utilisée grâce a l inoculation de noyaux porphyrines dans la tumeur et un rayonnement ciblé sur ces noyaux permet la destruction de la tumeur. En effet les certaines porphyrines ont tendance à se concentrer dans les… …   Wikipédia en Français

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  • Photodynamic therapy — Treatment that destroys cancer cells with lasers and drugs that become active when exposed to light. * * * (PDT, photoradiation therapy, phototherapy, photochemotherapy) a treatment for some types of superficial cancers. A photosensitizing agent… …   Medical dictionary

  • photodynamic therapy — Therapeutic approach in which a light sensitive prodrug is given and then the target area (usually a tumour) is illuminated to generate the active drug in the right place …   Dictionary of molecular biology

  • photodynamic therapy — noun A treatment for some forms of cancer and some skin disorders, involving the use of photosensitive chemicals, and controlled and directed laser beams …   Wiktionary

  • photodynamic therapy — Treatment with drugs that become active when exposed to light. These drugs kill cancer cells …   English dictionary of cancer terms

  • photodynamic — Relating to the energy or force exerted by light. [photo + G. dynamis, force] * * * pho·to·dy·nam·ic dī nam ik adj of, relating to, or having the property of intensifying or inducing a toxic reaction to light (as the destruction of cancer cells… …   Medical dictionary

  • photoradiation therapy — photodynamic therapy …   The new mediacal dictionary

  • therapy — 1. The treatment of disease or disorder by any method. SEE ALSO: therapeutics. 2. In psychiatry, and clinical psychology, a short term for psychotherapy. SEE ALSO: psychotherapy …   Medical dictionary

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