Nocturia
Excessive urinating at night. Nocturia can be normal and more common with aging. Nocturia can also be a sign of an underlying condition, such as diabetes or urinary infection.
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- Nocturnal amblyopia
Amblyopia refers to blindness so nocturnal amblyopia is, literally, night blindness. Listed in medical dictionaries under “Nyctalopia” from the Greek nyct (night) + aloas (obscure or blind) + opsis (vision), the condition involves impaired vision in dim light and in the dark due to impaired function of specific vision cells (namely, the rods) in the […]
- Nocturnal enuresis
Bedwetting at night. From the Greek “enourin” meaning “to urinate in.”
- Node
Literally a knot, a node is a collection of tissue. For example a lymph node, is a collection of lymphoid tissue. A nodule is a small node, a little collection of tissue.
- Node, atrioventricular
The electrical relay station between the upper and lower chambers of the heart. Abbreviated AV node. Electrical signals from the atria must pass through the AV node to reach the ventricles. The AV node, which controls the heart rate, is one of the major elements in the cardiac conduction system. The AV node serves as […]
- Node, AV
The AV node (AV stands for atrioventricular) is an electrical relay station between the atria (the upper) and the ventricles (the lower chambers of the heart). Electrical signals from the atria must pass through the AV node to reach the ventricles. The AV node is one of the major elements in the cardiac conduction system, […]