Hydrocephalus, normal pressure
Normal pressure hydrocephalus.
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- Hydrocephaly
In infants the most obvious sign of hydrocephalus is usually an abnormally large head. (That is one reason a baby’s head should be measured at every well-baby visit). Symptoms of hydrocephalus in an infant may include vomiting, sleepiness, irritability, an inability to look upwards, and seizures. In older children and adults there is no head […]
- Hydrogen
The most plentiful element in the universe and one present in all organic compounds. Hydrogen is a gas with an atomic number of 1 and the symbol H. Two isotopes of hydrogen — deuterium and tritium — have been used as tracers in metabolic studies. Tritium is a long-lived weak emitter of radiation and can […]
- Hydronephrosis
Distention of the kidney with urine. Hydronephrosis is caused by obstruction of urine outflow (for example, by a stone blocking the ureter).
- Hydrophobia
1. Literally, an irrational fear of water, to drink or to swim in. Someone who is scared of the water is hydrophobic. 2. A term once commonly used for rabies because in the later stages of that disease, the animal (or person) has difficulty swallowing and so fears a drink of water. From hydro-, water […]
- Hydrops fetalis
Gross edema (swelling), usually with anemia, of the fetus. It can be due to Rh blood group incompatibility, in which antibodies crossing the placenta from the mother destroy the red blood cells of the fetus. It can also be caused by a lethal form of the genetic disorder thalassemia, alpha thalassemia, in which alpha-chain polypeptides […]