A complication of diabetes in which the patient is unaware of a deep drop in blood sugar because it fails to trigger the secretion of epinephrine which generates the characteristic symptoms of hypoglycemia (such as palpitations, sweating, anxiety) that serve to warn the patient of the dropping blood glucose. The patient can then take action and eat to help reverse the hypoglycemia.
Hypoglycemia unawareness can result in prolonged exposure to hypoglycemia, resulting in a seizure, loss of consciousness, or brain damage. The development of hypoglycemia unawareness also makes intensified blood glucose control more difficult and puts the patient at risk for severe hypoglycemia-related complications.
Relating to hypoglycemia, an abnormally low level of the sugar glucose in the blood, usually a complication of diabetes, in which the body does not produce enough insulin to fully metabolize glucose. Hypoglycemic symptoms include tiredness, dizziness, confusion, increased heart rate, and a cold, clammy feeling. The treatment of hypoglycemia is careful diet, including eating […]
A condition in which decreased production of gonadal hormones leads to below-normal function of the gonads and to retardation of sexual growth and development in children. (The gonads are the ovaries and testes and the hormones they normally produce include estrogen, progesterone, and testosterone.)
The result of a cross between genetically unlike parents. A hybrid is therefore the offspring of parents who differ in regard to the particular gene in question.
- Hyaluronic acid
A viscous slippery substance that lubricates the joints, maintains the shape of the eyeballs, and is a key component of connective tissue. On a more technical level, hyaluric acid is an glycosaminoglycan (formerly called a mucopolysaccharide), a long unbranched polysaccharide (complex sugar), composed of repeating dimeric units of glucuronic acid and N acetyl glucosamine.
- Hyaline membrane disease
A respiratory disease of the newborn, especially the premature infant, in which a membrane composed of proteins and dead cells lines the alveoli (the tiny air sacs in the lung), making gas exchange difficult or impossible. The word “hyaline” comes from the Greek word “hyalos” meaning “glass or transparent stone such as crystal.” The membrane […]