Category: H
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Hypotonic saline
An aqueous solution of sodium chloride of less than 0.85%.
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Hypertonic saline
An aqueous solution of sodium chloride of greater than 0.85%.
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Hypoechoic rim
In ultrasonography, a thin border (2 mm or less) around a body part that produces few echoes. The rim is sometimes seen around abscesses, other inflamed structures, structures with many blood vessels at their edges, or the normal fetal heart.
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Hemorrhagic retinitis
Retinitis with pronounced hemorrhage into the retina.
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Histiocytic medullary reticulosis
A form of malignant histiocytosis marked by anemia; granulocytopenia; enlargement of the spleen, liver, and lymph nodes; and phagocytosis of red blood cells.
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Home remedy
A traditional therapy often utilizing natural products, nutritional supplements, or physical measures. Its effectiveness may be supported by familial, local, or culturally accepted stories or rituals. Also called a folk remedy
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Hyperacute rejection
Immediate, intense, and irreversible destruction of grafted material due to preformed antibodies. These antibodies are most common in patients who have rejected a previously transplanted organ or who have received multiple blood transfusions. The risk of hyperacute rejection has been nearly eliminated by testing the recipient’s blood for antibodies against donor lymphocytes before surgery.
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Hepatojugular reflux
Distention of the veins of the neck when the liver is compressed during physical examination of the abdomen. Neck vein filling during liver examination commonly is seen in patients with congestive heart failure but also may be a normal finding.
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Hepatorenal recess
A deep pocket inside the upper right peritoneal cavity between the liver and the peritoneal surface of the right kidney. When a person is lying on his back, fluid from the omental bursa will pool into the hepatorenal recess.
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Homing receptor
An adhesion molecule on leukocytes that binds to endothelial cells in blood vessels. It is used by white blood cells to guide them to inflamed or infected tissues in the body.