Hypospadias
A birth defect in which the urethra opens on the underside of the penis or below the penis. Treatment involves surgery to repair and reconstruct the urethra.
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- Hypotension
Any blood pressure that is below the normal expected for an individual in a given environment. Hypotension is the opposite of hypertension (abnormally high blood pressure). Hypotension is a relative term because the blood pressure normally varies greatly with activity, age, medications, and underlying medical conditions. Low blood pressure can result from conditions of the […]
- Hypotension, orthostatic
A temporary lowering of blood pressure, usually related to suddenly standing up. Healthy people may experience orthostatic hypotension if they rise quickly from a seated position, especially after a meal. Orthostatic hypotension occurs most commonly in older people. The change in position causes a temporary reduction in blood flow and therefore a shortage of oxygen […]
- Hypotension, postural
from sitting to standing or from lying down to sitting or standing. Postural hypotension is more common in older people. The change in position causes a temporary reduction in blood flow and therefore a shortage of oxygen to the brain. This leads to lightheadedness and, sometimes, a “black out” episode, a loss of consciousness. Tilt-table […]
- Hypotensive
Hypertensive; Normotensive.
- Hypothalamic hamartoma
A benign tumor of the hypothalamus, the area of the brain that controls body temperature, hunger, and thirst. (In technical terms, the hypothalamus lies beneath a structure known as the thalamus and forms the floor of the third ventricle of the brain.) A small hypothalamic hamartoma can cause the person to feel as though they […]