ABSTRACT
An extensive range of biocompatible materials has been used in patients. Diverse biomedical applications demand different properties of materials, implicating mechanical, physical, chemical, and biochemical properties. Amongst biocompatible ceramics, zirconia-based biomaterials are considered as a biomaterial for retexture of hard tissues related to their excellent mechanical properties and good biological and chemical compatibilities. Zirconia is used in dentistry and in orthopedics, specifically in the area of femoral heads for total hip replacements.
ABSTRACT
Intravascular papillary endothelial hyperplasia (IPEH) or reactive vascular endothelial lesion is a rare benign condition and is also known as Masson’s haemangioma. Blood vessel injury or venous thrombosis may predispose to this condition. Distinction of reactive entities from neoplastic condition like angiosarcoma is important. A case of cutaneous IPEH in forearm of an adult male is being reported here.
ABSTRACT
Determinamos la acción de los cambios hormonales, progesterona y estrogeno sobre la hematopoyesis, hemostasia, coagulacion y fibrinolisis, en mujeres nativas de la altura. Se estudio 50 casos, con se respectiva ficha clinica, antes y despues de ciclo menstrual. Se correlacionaron factores geneticos (Grupos, sanguineos: A, B, O). Los sujetos del grupo O y AB, mostraron disminucion significativa de sus reticulocitos (p<0.001). En cambio, los del grupo A y B, aumentaron el numero de estas celulas (p<0.001). Ademas en el grupo sanguineo O, se observo que hacen uso de las reservas de Fe (Protoporfirina), a diferencia de los otros grupos. Referente a la hemostasia, el estudio cuantitativo y cualitativo (numeracion, agragacion y fragilidad capilar), mostraron una disminucion significativa (p<0.05 - p<0.001). En la coagulacion se observo una disminucion significativa en cuanto a la actividad protrombinica y del tiempo de tromboplastina parcial, (p<0.005 y 0.0001). Esto expliacria los sangrados menstruales prolongados y abundantes. Finalmente, la fibrinolisis tuvo valores superiores a 3 horas, en relacion a os valores normales (12 hrs. 30 min). De este trabajo concluimos, que los factores geneticos influyen en la Eritropoyesis, la Hemostasia, Coagulación y Fribrinolisis, en los sujetos de la altura, lo que nos permitira continuar estos estudios, referentes a la Eritrocitosis de nuestro medio.
Subject(s)
Humans , Female , Adolescent , Adult , Partial Thromboplastin Time , Blood Platelets/cytology , Blood Platelets/physiology , Thromboplastin/physiology , Hormones/biosynthesis , Hormones/metabolism , Reference Values , Hemoglobin A/physiology , Menstrual Cycle/physiology , Blood Coagulation Factors/physiology , Blood Group Antigens/physiology , Hematocrit/trends , Data Collection/trendsABSTRACT
Heart rate (FC) response to perfusion with isoprenaline is decreased in sealevel natives on expuser to high altitude hypoxia. Since noredraline concentration in plasma is elevated under these condition as phenomenon of downregulation of the betareceptors (BAR) cuold be evoked. For the fisrt time, this aspect was explored in a population native from and residing at 3600 m consisting of normocythemics (HAN) and polycythemics (HAP). the results were compared to those obtained from a sealevel population, exmined in normoxia (SLN) at 4800 m (J. Appl. Physiol. 65:1975-61, 1988). The dose necessary to increase FC by 25 beats per min (125) was identical for HAN and HAP as well as SLN. This iondicates that the chronotropic responses is igual in the two populations when they are studied in their habitual environment; to the contrary, this response is diminished in SLH, thus correlating to the phenomenon of downregulation.