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Koch, Walter

(kōk) German surgeon, 1880–1962.

K.'s node Atrioventricular node.

Kocher reflex

(kō′kĕr) [Emil Theodor Kocher, Swiss surgeon, 1841–1917] A contraction of abdominal muscles following moderate compression of the testicle.

Kock pouch, Koch pouch

(kok) [Nils Kock, 20th-cent. Swedish surgeon] A continent ileostomy, constructed with a reservoir that holds intestinal waste until a catheter is used to empty it.


A genus of gram-positive cocci that cause disease primarily in immunocompromised or otherwise weakened human hosts. The cocci cluster, often in tetrads, and are catalase-positive and coagulase-negative. Species in the genus include K. kristinae, K. rosea, and K. rhizophila.

Koebner phenomenon

(kĕb′nēr) [Heinrich Koebner, Ger. dermatologist, 1838– 1904] The appearance of a skin lesion as a result of nonspecific trauma (e.g., sunlight, burn, operative wound). It will appear at the trauma site and may be of a type found elsewhere on the skin. It may be seen in lichen planus or eczema but is particularly characteristic of psoriasis. The lesion must be sufficient to act on the papillary and epidermal layers of the skin and will appear in 3 to 18 days following the trauma.


Formula for potassium hydroxide.

Köhler, Alban, Kohler, Alban

(kōl′ĕr, köl′ĕr) Ger. radiologist, 1874–1947.

K. disease 1. Aseptic necrosis of the navicular bone of the wrist. 2. Osteochondrosis of the head of the second metatarsal bone of the foot.

K. syndrome Pain in the midfoot with accompanying point tenderness over the navicular bone, with increased density and narrowing of the tarsal navicular on radiographs. Most patients respond to 6 weeks' immobilization in a cast with no long-term sequelae.

Kohlman Evaluation of Living Skills

(kōl′măn) ABBR: KELS. A standard assessment for determining the ability of an individual to perform self-care and community living tasks. The assessment includes an interview and tasks that measure self-care, safety and health, money management, transportation and telephone use, and work and leisure behaviors.


(koy-lō-nĭk′ē-ă) [″ +1 onyx, nail] Dystrophy of the fingernails in which they are thin and concave with raised edges. This condition is sometimes associated with iron-deficiency anemia. It is often called spooning of nails.


(koy″lō-stĕr′nē-ă) [″ + Gr. sternon, sternum] Condition in which the chest has a funnel-like depression in the middle of the thoracic wall.

Kondoleon operation

(kon-dō′lē-on) [Emmanuel Kondoleon, Gr. surgeon, 1879–1939] The surgical removal of layers of subcutaneous tissue to relieve elephantiasis.



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