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Medical Dictionary     D
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  • D
    Suffix indicating the presence of deuterium in a compound in concentrations above normal, thus labeling the compound; subscripts (d2, d3, etc.) indicate the number of such atoms so fortified.
  • D & C

    D & C: Dilatation and curettage, a minor operation in which the cervix is expanded enough (dilatation) to permit the cervical canal and uterine lining to be scraped with a spoon-shaped instrument called a curette (curettage).

  • D antigen
    one of 6 antigens that comprise the Rh locus. Antibody induced by D antigen is the most frequent cause of hemolytic disease of the newborn.
  • D loop
    a structure in replicating circular DNA.

    Alternate names: displacement loop

  • D wave
    a positive or negative deflection in the electroretinogram occurring when a light stimulus is removed (off-response).
  • D&C
    Abbreviation for dilatation and curettage.
  • D&E
    Abbreviation for dilatation and evacuation; dilation and extraction.
  • débouchement
    Opening or emptying into another part.
  • débridement
    Excision of devitalized tissue and foreign matter from a wound.
  • décollement
    Rarely used term for surgical separation of tissues or organs which are adherent, either normally or pathologically.
  • déjà voulu
    A term for a type of disturbance of memory in which a person believes that his or her present desires are exactly the same as desires held some time earlier.
  • déjà vu phenomenon
    the mental impression that a new experience (a scene, sight, sound, or action) has happened before; a common phenomenon in normal people that may occur more frequently or continuously in those with certain emotional or organic disorders. Also variously referred to as déjà entendu, déjà éprouvé, déjà fait, déjà pensé, déjà raconté, déjà vécu, or déjà voulu, depending on the experience or sense that is evoked.
  • Döderlein bacillus
    a large, gram-positive bacterium occurring in normal vaginal secretions; although thought by some to be identical with Lactobacillus acidophilus, the identity of Döderlein bacillus is still doubtful.
  • Döhle bodies
    discrete round or oval bodies ranging in diameter from just visible to 2 mcm, which stain sky blue to gray blue with Romanowsky stains, found in neutrophils of patients with infections, burns, trauma, pregnancy, or cancer.

    Alternate names: Döhle inclusions, leukocyte inclusions

  • Dührssen incisions
    three surgical incisions of an incompletely dilated cervix, corresponding roughly to 2-, 6-, and 10-o'clock, used as a means of effecting immediate delivery of the fetus when there is an entrapped head during a breech delivery.
  • Dürck nodes
    perivascular chronic inflammatory infiltrates in the brain, occurring in human trypanosomiasis.
  • d'Arcet metal
    an alloy of lead, bismuth, and tin; used in dentistry.
  • d'Arsonval galvanometer
    a sensitive galvanometer consisting of a moving coil suspended in a permanent magnetic field between delicate metallic wires or ribbons that serve as both torsion springs and conductors; a mirror on the coil deflects a beam of light along the scale.
  • d'Espine sign
    bronchophony over the spinous processes heard, at a lower level than in health, in pulmonary tuberculosis; an echoed whisper following a spoken word, heard in the stethoscope placed over the seventh cervical or first or second dorsal spine, in cases of tuberculosis of the mediastinal glands.
  • d'Ocagne nomogram
    an alignment chart consisting of an arrangement of three or more graduated lines (straight or curved), each constituting a scale of values of a variable, constructed so that any straight line crossing these scales connects the simultaneously compatible values; from values for any two variables, the values of all other variables can be determined.
  • d-
    Suffix indicating the presence of deuterium in a compound in concentrations above normal, thus labeling the compound; subscripts (d2, d3, etc.) indicate the number of such atoms so fortified.
  • d-3-hydroxybutyric acid dehydrogenase
    an enzyme that reversibly catalyzes the interconversion of the two main ketone bodies, catalyzing acetoacetate + NADH + H+ ⇄ d-3-hydroxybutyrate + NAD+.
  • d-amphetamine phosphate
  • d-amphetamine sulfate
  • d-digitoxose
    The carbohydrate moiety found in digitalis glycosides; 2,6-dideoxy-d-ribo-hexose.
  • d-dimer
    a dimer byproduct resulting from fibrinolysis; produced by cross linkage of d-domain fibrin monomers by activated factor XIII, fibrin stabilizing factor; present in low levels in normal animals, but found at particularly high levels in association with thrombotic and hemostatic disorders; assayed as an adjunctive diagnostic tool in conditions such as malignant neoplasia, infectious disease, immune-mediated hemolytic anemia, immune-mediated thrombocytopenia, hyperadrenocorticism, pulmonary thromboembolism, and disseminated intravascular coagulation or DIC. d-dimer production requires both plasmin and thrombin activation. Note that generation of fibrin/fibrinogen degradation products (FDPs) requires only plasmin action on fibrin or fibrinogen. d-dimers clear through urinary excretion, so assay may show falsely increased levels during renal dysfunction. Laboratory ELISA measurement can identify fibrinolysis.
  • d-dimer test
    test that detects the cross-linked fibrin degradation fragment, d-dimer. Elevations in this fragment are seen in primary and secondary fibrinolysis; during thrombolytic or defibrination therapy with tissue plasminogen activator; as a result of thrombotic disease, such as deep-vein thrombosis, pulmonary embolism or DIC; in vasoocclusive crisis of sickle cell anemia; in malignancies; and in surgery.
  • d-epirhamnose
    occurs in plants and bacteria in combination with diacylglycerol and is often sulfated (at C-6) in glycolipids.

    Alternate names: quinovose

  • d-galacturonic acid
    The d-isomer is an oxidation product of d-galactose, in which the 6-CH2OH group has become a –COOH group; occurs in many natural products (pectins) and cell walls.

    Alternate names: pectic acid

  • d-glucose
    a dextrorotatory monosaccharide (hexose) found in the free state in fruits and other parts of plants, and combined in glucosides, disaccharides (often with fructose in sugars), oligosaccharides, and polysaccharides; it is the product of complete hydrolysis of cellulose, starch, and glycogen. Free glucose also occurs in the blood, where it is a principal energy source for use by body tissues (normal human concentration, 70–110 mg per 100 mL); in diabetes mellitus, it appears in the urine. The epimers of d-glucose are d-allose, d-mannose, d-galactose, and l-idose. Dextrose should not be confused with the l-isomer, which is sinistrose.

    Alternate names: cellohexose

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