Manageiro V.,National Institute Of Health Dr Ricardo Jorge |
Ferreira E.,National Institute Of Health Dr Ricardo Jorge |
Cougnoux A.,Clermont University |
Albuquerque L.,Centro Hospitalar Of Coimbra |
And 3 more authors.
Antimicrobial Agents and Chemotherapy | Year: 2012
The clinical Klebsiella pneumoniae INSRA6884 strain exhibited nonsusceptibility to all penicillins tested (MICs of 64 to >2,048 μg/ml). The MICs of penicillins were weakly reduced by clavulanate (from 2,048 to 512 μg/ml), and tazobactam restored piperacillin susceptibility. Molecular characterization identified the genes blaGES-7 and a new β-lactamase gene, blaSHV-107, which encoded an enzyme that differed from SHV-1 by the amino acid substitutions Leu35Gln and Thr235Ala. The SHV-107-producing Escherichia coli strain exhibited only a β-lactam resistance phenotype with respect to amoxicillin, ticarcillin, and amoxicillin-clavulanate combination. The kinetic parameters of the purified SHV-107 enzyme revealed a high affinity for penicillins. However, catalytic efficiency for these antibiotics was lower for SHV-107 than for SHV-1. No hydrolysis was detected against oxyimino-β-lactams. The 50% inhibitory concentration (IC50) for clavulanic acid was 9-fold higher for SHV-107 than for SHV-1, but the inhibitory effects of tazobactam were unchanged. Molecular dynamics simulation suggested that the Thr235Ala substitution affects the accommodation of clavulanate in the binding site and therefore its inhibitory activity. Copyright © 2012, American Society for Microbiology. All Rights Reserved.
Pereira B.J.,Centro Hospitalar Of Coimbra
UroToday International Journal | Year: 2012
Primary adult soft tissue sarcomas represent 1% of all cancers and represent a treatment challenge for surgeons and oncologists. Of these sarcomas, 15% are located in the retroperitoneum. Randomized series that have examined both radiation therapy and chemotherapy have not shown a survival benefit. Conversely, radiotherapy may delay the time to local recurrence but not overall survival. Our review presents medical records of 5 consecutive patients undergoing retroperitoneal sarcoma excision from May 2004 through February 2006. Images were obtained from the patients' exams and during their surgical procedures. Surgery is the only potential curative treatment. As "retroperitoneal surgeons," urologists are completely able to approach these kinds of tumors. © 2012 Digital Science Press, Inc.
Nunes J.,Centro Hospitalar Of Coimbra
Acta médica portuguesa | Year: 2012
Selective and bilateral involvement of the limbic system by gliomas is rarely reported. The authors report the case of a 58 years-male complaining of short-term memory loss in the preceding three weeks. The initial MRI revealed areas of hyperintensity on T2 and FLAIR sequences involving both hippocampus, amygdala, parahippocampus gyrus and the fornix, with contrast enhancement in the right mesial temporal region. Limbic encephalitis diagnosis was assumed and steroid therapy was applied. All other evaluation work-up was negative and follow-up imaging was compatible with tumor. The neuropathologic study of the right temporal lesion revealed glioblastoma multiforme. Glioblastoma can crossover through the commissural white matter to the opposite cerebral hemisphere, most often through the corpus callosum. However, selective and bilateral invasion of the limbic system is rare and when it occurs it may mimic limbic encephalitis.
Guimaraes C.,Centro Hospitalar Of Coimbra
BMJ case reports | Year: 2012
Acute fibrinous and organising pneumonia (AFOP) was recently described as an unusual pattern of diffuse lung disease. Particular characteristics make the differential diagnosis with the well recognised clinical patterns of diffuse alveolar damage, cryptogenic organising pneumonia or eosinophilic pneumonia. The lack of hyaline membranes, the presence of intra-alveolar fibrin, absence of noticeable eosinophils and patchy distribution suggests that AFOP define a distinct histological pattern. The authors describe the case of a woman diagnosed with AFOP after surgical lung biopsy, in association with primary biliary cirrhosis. The patient presented dyspnoea, fatigue, dry cough and thoracic pain. The CT scan showed bilateral patchy infiltrates predominantly in the lower lobes. Flexible bronchoscopy and subsidiary techniques were inconclusive and biopsy through video-assisted thoracoscopic surgery led to anatomopathological diagnosis of AFOP. The patient is having a good clinical response to prednisone.
Costa Gomes B.,Centro Hospitalar Of Coimbra
Acta médica portuguesa | Year: 2012
Central Nervous System (CNS) infection by Human Immunodeficiency Virus (HIV) occurs early in the course of the disease and is associated with changes that can reach any level of the neuroaxis. Neuroimaging plays an increasingly important role both in diagnosis and in longitudinal monitoring of these complications, which can be divided into three major categories: injuries directly associated with HIV, opportunistic infections and malignancies. To identify and to describe the neuroradiological changes found in a population of HIV positive patients. Retrospective study with analysis of clinical processes and review of neuroimaging studies of HIV positive patients admitted to the Centro Hospitalar de Coimbra - E.P.E. in the period between 1st January 2008 and 31st March 2011. During the study period we identified 337 episodes of hospitalization of patients with HIV infection, accounting for a total of 196 patients. Of these, 88 underwent at least one neuroimaging examination, with a mean age of 47.1 (27-89) years, of which 75% were males. In 12.5% of the examinations we did not find any relevant changes. In 69.3% atrophy was observed, in 31.2% sequelae lesions with different aetiologies (vascular, infectious), and eight cases of HIV encephalitis were identified. In 19.3% of patients it was diagnosed the presence of an opportunistic infection (11 cases of toxoplasmosis, four of progressive multifocal leukoencephalopathy, one case of tuberculosis and one of neurosyphilis). There were also 10 cases with evidence of recent vascular lesions. Although considered in the differential diagnosis in some cases, in our sample we did not identify any case of tumours. Recognition of CNS changes associated with HIV infection and of their imaging patterns is of critical importance to the establishment of the diagnosis and to the appropriate treatment. Advanced techniques of Magnetic Resonance Imaging may have an important role in this context.