[L. trias, fr. Gr. trias, stem triad-, group of three]
1. A group of three things having something in common, e.g., a syndrome.
2. A trivalent element or radical.
The biological parents of a child, the adoptive parents, and the child who is adopted.
SEE: Austrian triad
SEE: Beck triad
SEE: Bergman triad
SEE: Carney triad
The enzymatically active mechanism found in serine proteases, consisting of three amino acids SER-HIS-ASP (serine, histidine, and aspartic acid).
SEE: Charcot, Jean M.
SEE: Currarino triad
SEE: Dieulafoy, Georges
A triad consisting of abnormal eating habits (eating disorders or disordered eating), amenorrhea, and osteoporosis among young female athletes. It is most common in sports in which low body weight has a beneficial effect on performance or appearance, e.g., gymnastics, running, swimming, and figure skating. Males participating in the same sports or in wrestling may also suffer the health-related effects of excessive training or abnormally restrictive eating. Disordered eating is often the first condition in the triad to appear.
Signs of the disorder include excessive training, food restriction, ritualized eating habits, and other obsessive behavior, binging and purging, fatigue, anemia, depression, and electrolyte imbalances. Fractures occur because of bone loss, which may not be reversible.
Screening female high school or younger at-risk athletes for disordered eating and menstrual irregularities is recommended as a first step in preventing development of the disorder. During physical exams required for participation in sports, athletes should be asked about food intake within the past 24 hr, perceived ideal weight, forbidden foods, and use of diet aids. Some women and coaches believe that amenorrhea is a normal consequence of athletic training rather than a sign of injury to the hypothalamic-pituitary axis. A dual-energy x-ray absorptiometry (DEXA) scan or similar study should be considered in athletes with amenorrhea lasting at least 6 months. The patient, dietitian, and primary care provider should agree on a goal weight, after considering the weight requirements for the sport.
A collective term for three related forms of localized skin abscess: hidradenitis suppurativa, acne conglobata, and dissecting cellulitis of the scalp.
SEE: Garland triad
The combination of acidosis, coagulopathy, and hypothermia in a critically ill patient. It is an indication of very severe illness and has a poor prognosis.
SEE: Saint triad
SEE: Samter triad
1. A colloquial term for a dislocation of the elbow accompanied by fractures of the coronoid process of the ulna and of the radial head. The injury produces an unstable joint.
2. A knee injury in which a tear in the anterior cruciate ligament and in the medial collateral ligament occur at the same time as a medial meniscus tear.
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