Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic

This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic

Estudo comparativo dos meios de contraste baritado e iodado-iônico e não-iônico no trato respiratório de ratos Comparative study of barium and iodine agents - ionic and nonionic on the respiratory tract of the rats

OBJETIVO: Durante estudos radiológicos pode ocorrer a passagem do meio de contraste para a árvore traqueo-brônquica, determinando reações adversas e até fatais. O objetivo deste estudo é conhecer as alterações desencadeadas no trato respiratório pela presença do meio de contraste. MÉTODOS: Utilizaram-se 91 ratos divididos, aleatoriamente, em 4 grupos. Um grupo de controle não manipulado com 7 animais e os demais grupos com 21 ratos. O grupo controle manipulado recebeu solução fisiológica e os grupos de experimento: bário, iodo ônico e iodo não iônico conforme o grupo a que pertenciam. Sob anestesia e visibilização direta da traquéia, injetou-se 0,75 ml/kg (0,25 ml) do meio de contraste de acordo com o grupo ao qual pertencesse o animal. Realizaram-se as aferições com 1 hora, 1 dia e 1 semana. Os ratos foram sorteados para a autanásia nos três tempos estudados. Fez-se documentação radiográfica seguida da ressecção dos pulmões e exame histo-patológico. RESULTADOS: Na primeira hora, no grupo que recebeu bário, os campos médios e o superior direito ficaram acometidos. Nos grupos que receberam iodo iônico e iodo não iônico, todo o pulmão direito mostrava-se opacificado. Nas avaliações de uma dia e 1 semana os grupos que receberam iodo estavam normais enquanto que o grupo que recebeu bário mostrava comprometimento dos campos médios. No estudo histo-patológico observou-se, no grupo que recebeu bário, na avaliação de uma semana, grande quantidade de macrófagos intra-alveolares, perivasculares e peribrônquicos. CONCLUSÃO: Os contrastes iodados iônico e não iônico levam a alterações passageiras enquanto que o bário promove reação inflamatória crônica com manutenção da tradução radiográfica, no rato.<br>PURPOSE: During roadiologic studies, passage of the contrast medium to the tracheobronchial tree may occur, causibng adverse or even fatal reactions. The objective of the present study was to determine the changes in the respiratory tract triggered by the presence of contrast medium. METHODS: Ninety-one rats were divided at random into 5 groups, i.e., an intact control group of 7 animals and 4 groups of 21 rats each. The manipulated control group received physiological saline and the experimental groups respectively received barium, ionic iodine and non-ionic iodine. Under anesthesia and direct visualization of the trachea, 0.75 ml/kg (0.25 ml) of the contrast medium was injected into the animals of each group. The effects of the procedure were determined after 1 hour, 1 day and 1 week, with the animals being sacrificed at each time point by drawing lots. Radiographic documentation was obtained, followed by resection and histopathologic examination of the lungs. RESULTS: After 1 hour, the middle fields and the right upper field were involved in the group injected with barium. In the groups injected with ionic iodine and non-ionic iodine, the entire right lung was found to be opacified. After 1 day and 1 week, the groups injected with iodine were normal, whereas the group injected with barium showed involvement of the middle fields. After 1 week, histopathologic examination revealed that the group injected with barium exhibited large amounts of intra-alveolar, perivascular and peribronchial macrophages CONCLUSION: The ionic and non-ionic iodine contrast media led to temporary changes, whereas barium promoted a chronic inflammatory reaction with maintenance of radiographic translation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

A hydrothermal (HTMW) microwave method was used to synthesize ordered–disordered BaZrO3 (BZ) nanoparticles at temperature of 140 °C with times ranging from 15 min to 2 h. X-ray diffraction results verified the formation of BZ crystallites at a soaking time of 2 h while infrared data showed no traces of carbonate. Field emission scanning microcopy revealed a homogeneous size distribution of nanometric BZ powders. HTMW produced nanoparticles of pure BZ phase, with a size ranging from 40 to 80 nm. These results are in agreement with Raman scattering values which show that the HTMW synthesis route is rapid and cost effective. This method could be used as an alternative to obtain BZ nanoparticles as compared to other chemical methods. Intense photoluminescence in disordered BZ powders was observed at room temperature. The key of mystery of the intense PL emission is related to order–disorder structural in BZ lattic