Category: D
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Definitive callus
The exudate found between two ends of a fractured bone, that develops into true bone.
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Dystrophic calcification
The deposition of calcium salts in dead, dying, or necrotic tissues.
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Duodenal bulb
The upper duodenal area just beyond the pylorus.
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Ductal carcinoma in situ of the breast
A cluster of malignant cells in the mammary ducts. If left untreated, as many as 50% of patients with DCIS will develop invasive cancer. Because these cells grow in the ducts, they develop without forming a palpable mass. In its early stage this condition can be diagnosed through the use of mammography.
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Direct measurement of blood pressure
Determination of the blood pressure within the lumen of an artery or within a chamber of the heart with a catheter introduced into the organ and attached to a pressure-monitoring transducer. It is done by placing a sterile needle or small catheter inside an artery and having the blood pressure transmitted through that system to…
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Defibrinated blood
Whole blood from which fibrin has been removed. It does not clot.
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Digital block
The injection of a regional anesthetic into the proximal portion of a finger or toe.
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Dry birth
A colloquial and imprecise term for a birth that follows premature rupture of membranes.
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Direct bilirubin
Bilirubin conjugated by the liver cells to form bilirubin diglucuronide, which is water-soluble and excreted in urine.
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Dropped beat
A single interruption in the regular pacing of the electrical and mechanical activity of the heart. A specific kind of heart rhythm disorder is defined by the omission of one single heart contraction in the ventricles. The subsequent heartbeat usually occurs a bit ahead of schedule and tends to be stronger than the norm; it’s…