Assessment of liver tumor response to therapy: role of quantitative imaging.

Quantitative imaging is the analysis of retrieved numeric data from images with the goal of reducing subjective assessment. It is an increasingly important radiologic tool to assess treatment response in oncology patients. Quantification of response to therapy depends on the tumor type and method of treatment. Anatomic imaging biomarkers that quantify liver tumor response to cytotoxic therapy are based on temporal change in the size of the tumors. Anatomic biomarkers have been incorporated into the World Health Organization criteria and the Response Evaluation Criteria in Solid Tumors (RECIST) versions 1.0 and 1.1. However, the development of novel therapies with different mechanisms of action, such as antiangiogenesis or radioembolization, has required new methods for measuring response to therapy. This need has led to development of tumor- or therapy-specific guidelines such as the Modified CT Response Evaluation (Choi) Criteria for gastrointestinal stromal tumors, the European Association for Study of the Liver (EASL) criteria, and modified RECIST for hepatocellular carcinoma, among many others. The authors review the current quantification criteria used in the evaluation of treatment response in liver tumors, summarizing their indications, advantages, and disadvantages, and discuss future directions with newer methods that have the potential for assessment of treatment response. Knowledge of these quantitative methods is important to facilitate pivotal communication between oncologists and radiologists about cancer treatment, with benefit ultimately accruing to the patient.

Highly accelerated cardiac MRI using iterative SENSE reconstruction: initial clinical experience.

To evaluate the qualitative and quantitative performance of an accelerated cardiovascular MRI (CMR) protocol that features iterative SENSE reconstruction and spatio-temporal L1-regularization (IS SENSE). Twenty consecutively recruited patients and 9 healthy volunteers were included. 2D steady state free precession cine images including 3-chamber, 4-chamber, and short axis slices were acquired using standard parallel imaging (GRAPPA, acceleration factor = 2), spatio-temporal undersampled TSENSE (acceleration factor = 4), and IS SENSE techniques (acceleration factor = 4). Acquisition times, quantitative cardiac functional parameters, wall motion abnormalities (WMA), and qualitative performance (scale: 1-poor to 5-excellent for overall image quality, noise, and artifact) were compared. Breath-hold times for IS SENSE (3.0 ± 0.6 s) and TSENSE (3.3 ± 0.6) were both reduced relative to GRAPPA (8.4 ± 1.7 s, p < 0.001). No difference in quantitative cardiac function was present between the three techniques (p = 0.89 for ejection fraction). GRAPPA and IS SENSE had similar image quality (4.7 ± 0.4 vs. 4.5 ± 0.6, p = 0.09) while, both techniques were superior to TSENSE (quality: 4.1 ± 0.7, p < 0.001). GRAPPA WMA agreement with IS SENSE was good (κ > 0.60, p < 0.001), while agreement with TSENSE was poor (κ < 0.40, p < 0.001). IS SENSE is a viable clinical CMR acceleration approach to reduce acquisition times while maintaining satisfactory qualitative and quantitative performance.

[Prevalence of signs/symptoms suggestive of latex sensitization in health care workers.]. / Prevalência de sinais/sintomas sugestivos de sensibilização ao látex em profissionais de saúde.

BACKGROUND AND OBJECTIVES: In the literature, the references on adverse reactions to latex products have been significantly increasing for the last few years. However, it lacks Brazilian data regarding the prevalence of latex-related sensitization in health care workers. The objective of this study was to evaluate the prevalence of signs and symptoms suggestive of latex-related sensitization in health care workers. METHODS: Upon approval by the Ethics Committee it were selected a population of subjects from the Institution's departmental workforce: the Surgical Center Cleaning, Accounting and Nursing personnel and the physicians working at the Surgery, Gynecology, Obstetrics, Anesthesiology, Intensive Care Unit and Medical Clinics. After the informed consent has been obtained, the subjects were submitted to a questionnaire on: age, gender, professional category; type and length of time in contact with latex products; type of gloves; signs/symptoms suggestive of latex-related sensitization (LS) in and out of the hospital environment; signs/symptoms suggestive of atopy and food allergy. RESULTS: A total of 326 questionnaires were evaluated (193 women and 133 men, aged between 30 and 73 years old). Out of this total, 75% of interviewees had up to 10-year length of service in their professions. The prevalence of signs/symptoms suggestive of sensitization to latex in the hospital environment, between the group of employees working in the Accounting Sector (therefore not exposed to latex in the workplace) and the remaining employees (exposed to latex products in their working environment) was significantly different (p<0.001). Also, the percentage of signs/symptoms suggestive of LS in the hospital environment was higher in subjects showing higher average time of use of gloves per day. CONCLUSIONS: The present study demonstrated higher prevalence of signs/symptoms suggestive of LS among those workers exposed to latex products in the hospital environment and with higher contact time with any type of gloves. Therefore, it is clear the need to proceed with this research, for laboratorial confirmation of the latex-related sensitization, as well as that a proposal be submitted to the Institution towards the adoption of preventive measures regarding latex-related sensitization issue. Also, a consensus must exist to the fact that the health care workers comprise a population in risk for allergy to latex products.

Prevalência de sinais/sintomas sugestivos de sensibilização ao látex em profissionais de saúde / Prevalence of signs/symptoms suggestive of latex sensitization in health care workers

JUSTIFICATIVA E OBJETIVOS: As referências na literatura sobre reações aos derivados do látex têm aumentado significativamente nos últimos anos. Faltam, entretanto, dados do nosso país relativos à prevalência de sensibilização ao látex nos profissionais da área da saúde. O objetivo deste estudo foi avaliar a prevalência de sinais/sintomas sugestivos de sensibilização ao látex em profissionais da área da saúde. MÉTODO: Após aprovação pelo Comitê de Ética foram selecionados indivíduos pertencentes ao quadro da instituição: funcionários do Setor de Limpeza, Contabilidade e Divisão de Enfermagem do Centro Cirúrgico; Médicos da Cirurgia, Ginecologia, Obstetrícia, Anestesiologia, Unidade de Terapia Intensiva e Clínica Médica. Após consentimento informado, os indivíduos foram submetidos a um questionário sobre: idade, sexo, categoria profissional; tipo e tempo de contato profissional com derivados do látex; tipo de luva; sinais/sintomas sugestivos de sensibilização ao látex dentro e fora do ambiente hospitalar; sinais/sintomas sugestivos de atopia e de alergia a alimentos. RESULTADOS: Foram avaliados 326 questionários (193 mulheres e 133 homens, com idade entre 30 e 73 anos). Setenta e cinco por cento dos entrevistados apresentaram até 10 anos de tempo na profissão. A prevalência dos sinais/sintomas sugestivos de sensibilização ao látex dentro do ambiente hospitalar em relação aos grupos compostos pelos funcionários do Setor de Contabilidade (não expostos a derivados do látex no ambiente de trabalho) e o restante dos indivíduos (expostos a derivados do látex no ambiente de trabalho) mostrou diferença significativa (p < 0,001). A porcentagem de sinais/sintomas sugestivos de sensibilização ao látex no ambiente hospitalar foi maior nos indivíduos com maior tempo médio de uso de luvas por dia. CONCLUSÕES: Este estudo mostrou maior prevalência de sinais/sintomas sugestivos de sensibilização ao látex entre os profissionais expostos aos derivados do látex em ambiente hospitalar e com maior tempo de contato com luvas de qualquer tipo. Assim, torna-se clara a necessidade de se prosseguir esta pesquisa, para confirmação laboratorial da sensibilização ao látex, assim como propor à Instituição a adoção de medidas de prevenção da sensibilização ao látex. Deve haver conscientização de que profissionais da área da saúde constituem uma população de risco para alergia aos derivados do látex.