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P. R. S. Ribeiro, L. Pezza, H. R. Pezza. Determinao espectrofotomtrica de metildopa em formulaes farmacuticas. Resumo: Um novo mtodo espectrofotomtrico, simples, preciso, rpido e de baixo custo para determinao de metildopa em formulaes farmacuticas descrito neste trabalho. Este mtodo baseado na reao de complexao do metildopa com molibdato. A absorbncia do produto colorido resultante foi medida a 410 nm. A Lei de Beer foi obedecida em um intervalo de concentrao de 50 200 mg L-1 de metildopa com um excelente coeficiente de correlao r 0, 9999 ; . Os excipientes comumente usados como aditivos em formulaes farmacuticas contendo metildopa no interferem no mtodo proposto. Os resultados mostram um mtodo simples, exato, rpido e que pode ser aplicado para a determinao rotineira de metildopa em produtos farmacuticos. Os resultados obtidos a partir da anlise destes produtos pelo mtodo proposto concordaram muito bem com aqueles obtidos a partir do mtodo oficial descrito na Farmacopia Brasileira a um nvel de confiana de 95%. Palavras-chave: metildopa; espectrofotometria; medicamentos; molibdato de amnio. CONCLUSIONS Tricyclic antidepressants are less commonly associated with torsade de pointes than are antipsychotic drugs, particularly low-dose phenothiazine agents. However, there are enough case reports of tricyclic antidepressant-induced torsade de pointes to justify physicians' concern, particularly in cases of tricyclic antidepressant overdose. It seems likely that potassium-channel blockade best explains the capacity of tricyclic antidepressants to prolong the QT interval and provoke torsade de pointes. Use of a combination of tricyclic antidepressants and low-dose phenothiazines and, perhaps, other antipsychotic drugs ; may place the patient at increased risk for torsade de pointes. As is the case with antipsychotic drugs, factors such as age, sex, drug dose, coprescription of metabolic inhibitors, hypokalemia, hypomagnesemia, metabolic and cardiovascular disease, personal history of syncope, family history of sudden cardiac death, and QTc interval prolongation are probably risk factors for tricyclic antidepressant-induced torsade de pointes. The recent emergence of Brugada syndrome and associated torsade de pointes and sudden cardiac death apparently exacerbated by tricyclic antidepressant administration raises new concerns in psychopharmacology. More information will be necessary to place this syndrome into proper perspective for the psychiatrist. 11. The milligram molecular weight of a compound is the sum of the a w s all the atoms that appear in its chemical formula, with the weights expressed in . 12. Using Table 1-1 in this subcourse and rounding the atomic weights to the nearest whole number, what is the milligram molecular weight of sodium bicarbonate, NaHCO3? Atoms: Na + H. I feel like im going out of my mind sinus sprays don't work sudafed and benydryl doesnt help either. Table II. Disaccharide composition of the CS chains of CSPG purified from bovine tracheal cartilage and cCSA Composition % mol ; a di-0S CSPG I ; CSPG II ; CSA cCSA fraction I cCSA fraction II.

81% ; had a proliferation index greater than 5%. All but one adenoma had proliferation indices less than 2.4%, and most 19 23, 83% ; had a proliferation index equal or less than 1%. There was no significant difference in the proliferation indices of carcinomas with metastases and carcinomas with vascular invasion alone. Discussion Diagnosing malignancy in adrenocortical neoplasms can be very challenging for the pathologist. In human medicine, a combination of clinical, histologic, and immunohistochemical criteria are used to differentiate between adenomas and carcinomas of the adrenal cortex.2, 3, 6, 912, In our study, 10 histopathologic criteria were determined to be diagnostically useful in differentiating between adrenocortical adenomas and carcinomas in dogs. These included size, peripheral fibrosis, capsular invasion, trabecular growth pattern, hemorrhage, necrosis, single-cell necrosis, hematopoiesis, fibrin thombi, and cytoplasmic vacuolation Table 1 ; . As humans, carcinomas were significantly larger than adenomas.6, 11, 17, 29 The difference in tumor size may serve as an indicator of malignancy in diagnostic imaging studies or at surgery. However, some caution is required because adrenocortical adenomas in dogs have been reported to measure up to 6 diameter.7 The importance of evaluating growth pattern is manifold. The trabecular growth pattern is easily identifiable because artifactual separation often highlights the trabecular, almost papillary, pattern. This pattern was significantly associated with carcinomas. Moreover, most of the carcinomas with metastases had a trabecular growth pattern, suggesting that this growth pattern may be associated with a more aggressive biological behavior. The fibrin thrombi, a feature of adenomas, were usually located in large dilated veins and, therefore, thought to be due to blood stasis. Hematopoiesis, another easily identifiable feature, was present in 83% 19 23 ; of the adenomas and only 12% 3 26 ; of the and sulfasalazine. The Center for Bio-Medical Communication, Inc CBC ; is accredited by the Accreditation Council for Continuing Medical Education ACCME ; to provide continuing medical education for physicians.This CME activity was planned and produced in accordance with the ACCME essentials.