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Haematology
Published in Paul Bentley, Ben Lovell, Memorizing Medicine, 2019
Vascular:FBC, film and clotting times are normalTourniquet Hess test: Blood pressure cuff inflated for 5 min; count petechiae within 2.5 cm diameter circle measured 4 cm below cubital fossa; if >20 petechiae = capillary fragility ↑
H
Published in Anton Sebastian, A Dictionary of the History of Medicine, 2018
Hess Test Used to detect capillary fragility with the help of sphygmomanometer cuff to raise venous pressure. Devised by NewYork physician, Alfred Fabian Hess (1875–1933). He divided his time between the Rockefeller Institute and the Babies Hospital at Bellevue. He showed that rubella was caused by a virus and wrote books on scurvy and rickets.
Vitamins, trace elements and metals
Published in Martin Andrew Crook, Clinical Biochemistry & Metabolic Medicine, 2013
Many of the signs and symptoms of scurvy are related to deficient collagen formation and include the following. Fragility of vascular walls causing a bleeding tendency, often with a positive Hess test; petechiae and ecchymoses; swollen, tender, spongy, bleeding gums; and, sometimes, haematuria, epistaxis and retinal haemorrhages. In infants, subperiosteal bleeding and haemarthroses are extremely painful and may lead to permanent joint deformities.Poor wound healing.Deficiency of bone matrix causing osteoporosis and poor healing of fractures. In children, bone formation is impaired at the epidiaphyseal junctions, which look ‘frayed’ radiologically and can mimic non-accidental injury. The enzyme procollagen hydroxylase is mediated by vitamin C and is important for the intracellular matrix. In children there are tender limbs due to poor osteoid, costochondral bleeding (scorbutic rosary) and ground-glass bone X-ray appearance.Anaemia, possibly due to impaired erythropoiesis and poor iron absorption. The anaemia is aggravated by bleeding.
Divergence bias in Hess compared to Harms screen strabismus testing
Published in Strabismus, 2021
Muriel Dysli, Fabienne C. Fierz, Daniel Rappoport, Tanja Schmückle Meier, Klara Landau, Christopher J. Bockisch, Konrad P. Weber
The Hess and the Harms test both are haploscopic screen tests that are widely used, especially in European countries, to map ocular deviation. In our study, we found a significant exodeviation shift in the Hess test and nPCT compared to the Harms test for horizontal eye position in strabismus patients, that appears related to the nearer viewing distance of both the Hess test and nPCT relative to the Harms test.