Analytical modeling of the thermomechanical behavior of ASTM F-1586 high nitrogen austenitic stainless steel used as a biomaterial under multipass deformation.

Precipitation-recrystallization interactions in ASTM F-1586 austenitic stainless steel were studied by means of hot torsion tests with multipass deformation under continuous cooling, simulating an industrial laminating process. Samples were deformed at 0.2 and 0.3 at a strain rate of 1.0s(-1), in a temperature range of 900 to 1200°C and interpass times varying from 5 to 80s. The tests indicate that the stress level depends on deformation temperature and the slope of the equivalent mean stress (EMS) vs. 1/T presents two distinct behaviors, with a transition at around 1100°C, the non-recrystallization temperature (Tnr). Below the Tnr, strain-induced precipitation of Z-phase (NbCrN) occurs in short interpass times (tpass<30s), inhibiting recrystallization and promoting stepwise stress build-up with strong recovery, which is responsible for increasing the Tnr. At interpass times longer than 30s, the coalescence and dissolution of precipitates promote a decrease in the Tnr and favor the formation of recrystallized grains. Based on this evidence, the physical simulation of controlled processing allows for a domain refined grain with better mechanical properties.

Onychomadesis outbreak linked to hand, foot, and mouth disease, Spain, July 2008.

In July 2008 an onychomadesis outbreak in a nursery setting was reported in Saragossa (Spain). Some of the cases had previously suffered from hand, foot and mouth disease (HFMD). In order to study the outbreak and to determine the relation between the two diseases, two epidemiological studies were conducted: a descriptive study focused on cases and a retrospective cohort study. Samples from stool, pharynx and nails were obtained from cases for microbiological analysis. During the study period, 27 children fulfilled the case definition. The average age was 1.8 years. A case shed on average four nails (minimum one maximum twelve). Twenty-four of the 27 cases had previously presented with HFMD which started an average of 40 days before the onset of onychomadesis (relative risk: 14). Unidentified non-polio enterovirus (n=10), coxsackie B1 (n=4) and coxsackie B2 virus (n=3) were isolated in 28 specimens obtained from 14 cases. The analysis showed a strong association between HMFD and onychomadesis. Microbiological results have not been conclusive; consequently more studies are necessary to determine the causal agent of infectious onychomadesis.

[Preseptal and orbital cellulitis in childhood: response to intravenous antibiotics]. / Celulitis preseptal y orbitaria en la infancia: respuesta a antibioterapia intravenosa.

PURPOSE: To evaluate retrospectively the response of preseptal and orbital cellulitis in children to empiric antibiotic treatment. METHOD: We included nine patients (five male and four female) admitted to our hospital between October 2002 and October 2003 because of preseptal or orbital cellulitis. RESULTS: Four patients (44.4%) responded to empiric antibiotic treatment (R); five (55.5%) did not respond (NR) and required a second antibiotic to resolve the infection. The presence of an upper respiratory infection was the most common associated disease in both groups, R and NR. However we also found two cases of acute dacryocystitis in the NR. Four patients (44.4%) were treated with cefotaxime intravenously with the infection resolving in three of these. Five patients (55.6%) were treated with cefuroxime intravenously as first empiric option, however only one patient responded. CONCLUSIONS: We found a high prevalence of acute dacryocystitis as a potential cause of the cellulitis. Children with preseptal and orbital cellulitis responded better to cefotaxime than to cefuroxime. The presence of acute dacryocystitis was associated with a lack of response to cefuroxime.

[Palpebral metastasis revealing a gastric adenocarcinoma]. / Metástase palpebral reveladora de adenocarcinoma gástrico.

The authors present a case of a gastric adenocarcinoma in which the major manifestation was cutaneous metastases of the eyelids--in a review of the literature, no reports were found. Based upon this unusual case and in light of present knowledge, we decided to revise the concept of cutaneous metastases secondary to internal neoplasia, in particular, these with a gastric localization.

[Significance of the captopril test in the diagnosis of primary hyperaldosteronism --apropos of 4 clinical cases]. / O valor do teste do captopril no diagnóstico do hiperaldosteronismo primário--a propósito de 4 casos clínicos.

We describe four cases of primary hyperaldosteronism whose initial presentation was a moderate to severe hypertension. In three patients an adrenal adenoma was found; in another patient was due to unilateral adrenal hyperplasia. A good therapeutic response was achieved in all cases by unilateral adrenalectomy. The captopril test (Lyons version) proved useful to exclude essential hypertension and, may be, in distinguishing the new sub-types of primary hyperaldosteronism recently described. Indeed, only in the case of unilateral adrenal hyperplasia a fall in plasma aldosterone levels was observed. However, we feel that further investigation is needed to clarify this point.