Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «D»:
Douglas, pouch of
Douglas, pouch of: An extension of the peritoneal cavity between the rectum and back wall of the uterus.
The term "cul-de-sac," aside from being any "blind pouch or cavity that is closed at one end," is used specifically to refer to the rectouterine pouch. From that fact comes:
Culdoscopy, the int...
Doula: 1. A non-medical assistant in childbirth. A doula is not
the father but is usually a woman who is experienced in childbirth. The role of
the doula is to provide the mother with physical and emotional assistance
before, during, or after childbirth. Also known as a birth assistant, birth
Dowager's hump: An abnormal outward curvature of the vertebrae of upper back. Compression of the front (anterior) portion of the involved vertebrae leads to forward bending of the spine (kyphosis) and creates a hump at the upper back.
Dowager's hump is due to osteoporosis changes in the thoracic sp...
Down syndrome: A common chromosome disorder due to
an extra chromosome number 21 (trisomy 21). Down syndrome causes
mental retardation, a characteristic face, and multiple
malformations. Down syndrome is a relatively common birth defect. The
chromosome abnormality affects both the physical and ...
Down syndrome critical region
Down syndrome critical region: (Abbreviated DSCR) A region on the long (q) arm of chromosome 21 thought to be responsible for some, if not all, of the features of Down syndrome. A number of genes in this region may be involved in the production of the Down syndrome phenotype.
These genes may include...
Down syndrome features
Down syndrome features: Children with Down syndrome have multiple malformations and mental impairment due to the presence of extra material from chromosome 21.
Among the more common physical features are hypotonia (floppiness), small head with brachycephaly, epicanthic folds across the inside corn...
Down-regulation: See: Downregulation....
Downregulation: An decrease in the number of receptors on the surface of target cells, making the cells less sensitive to a hormone or another agent. Some receptors can be rapidly down regulated.
Doxorubicin cardiomyopathy: Heart disease due to the drug doxorubicin (brand name:Adriamycin), a potent broad-spectrum antitumor agent effective in treating a variety of cancers including solid tumors and leukemia. Unfortunately, its clinical use is limited by dose-dependent cardiac side effects tha...
Doxycycline: Brand name: Vibramycin. A synthetic broad-spectrum antibiotic derived from tetracycline. Doxycycline is used for many different types of infections, including respiratory tract infections due to Hemophilus influenzae, Streptococcus pneumoniae, or Mycoplasma pneumoniae. It is also used f...
Doyle, Sir Arthur Conan
Doyle, Sir Arthur Conan: See: Conan Doyle, Sir Arthur....
Doyne honeycomb retinal dystrophy
Doyne honeycomb retinal dystrophy: Abbreviated DHRD. An eye disease also known as malattia leventinese. See: Malattia leventinese....
DPC4: See: MADH4....
DPT: Diphtheria-Pertussis-Tetanus vaccine. Today the more
frequent abbreviation is DTP (for Diphtheria-Tetanus-Pertussis vaccine)....
DPT immunization: Immunization to protect against
diphtheria, pertussis (whooping cough), and tetanus. DPT immunizations are given in a series of 5 shots at
2, 4, 6, 18 months of age and 4-6 years of age. Thanks to vaccination programs, these
diseases have become less common. However, there are sti...