Results: There were 56 perfusionists in this study. Pressure average of 56 measurements of dynamic calibration was 434 ± 214 mmHg; 76% of measurements were within the recommended range for the use of the dynamic calibration method (between 150 and 500 mmHg).Conclusion: Brazilians perfusionists tend to adjust roller pumps with less occlusive settings. The amplitudes of the dynamic calibration pressure tend to be smaller for more experienced perfusionists because their skills increase with 206VIEIRA JUNIOR, FU ET AL -Brazilian perfusionists and arterial roller pump adjustment: comparison between static and dynamic calibration method Bras Cir Cardiovasc 2011;26(2):205-12 Rev

Resumo: O texto é registro de parte de um trabalho de tese em andamento cujo objeto empírico é o cartaz utilizado nas manifestações de junho de 2013 no Brasil e pesquisado a partir dos estudos em midiatização. Destaca-se a presença dos cartazes nas ruas e nas redes sociais digitais, constituindo-se como suporte responsivo, ativo, no processo comunicacional; como dispositivos da circulação interacional, nas redes e nas ruas. Palavras-chave: Midiatização, cartaz, manifestações, dispositivo, circulação interacional. Abstract: The text is part record of an ongoing thesis whose empirical object is the poster used in the manifestations of June 2013 in Brazil and researched from the studies in mediatization. It stands out the presence of the posters in the streets and digital social networks, constituting as responsive, active support in the communicational process; as devices of the interactional circulation, in the networks and in the streets.

Cardiopulmonary bypass is a procedure in which blood circulates outside the body in order to maintain oxygenation and blood flow conditions during the performance of certain surgical procedures; for this procedure, it is used a set of equipments whose function is to temporarily replace the heart and lungs. However, the cardiopulmonary bypass is perceived by the body as an aggressor agent and one of the main parameters related to the damage it causes is hemolysis. The use of driving pumps is a cause of hemolysis in procedures involving cardiopulmonary bypass and one of the main types of driving pumps is the roller pump. Hemolysis caused by the use of roller pump is mainly due to the degree of roller occlusion used. There are two methods commonly used for adjusting the roller pump: the method of drop rate and the dynamic calibration method. In this work, we developed a device to assist the perfusionist adjust roller pumps by a less occlusive method, the dynamic calibration method. The device is based on a PIC 18F4523 microcontroller and is used in conjunction with disposable pressure transducers commonly used in surgical procedures. We have characterized three pressure transducers in the range of 0 to 1000 mmHg. Calibration results obtained with the prototype were compared with those obtained with a data acquisition board. Two of the three transducers were submitted to fatigue tests and one was kept as a reference. To validate the constructed device, being used to perform dynamic calibration, adjustments were at 150, 250, 350, 450 and 500 mmHg, in each set were performed eight simultaneous measurements of dynamic calibration mean pressure with the device and with a data acquisition board. After all tests were conducted, the transducers were recharacterized. The three characteristic curves obtained in the initial characterization showed statistically equivalence (p > 0.05) among themselves. After the fatigue tests no changes were observed in the responses of pressure transducers in the beginning and in the end of the tests, at the same pressure points (p > 0.05). Measurements of dynamic calibration pressure obtained with the prototype showed statistically equivalence (p > 0.05) throughout the tested pressure range, when compared with the results obtained with the data acquisition board. We conclude that the transducers currently used in surgical procedures may be used for dynamic calibration without losing their characteristics and that the constructed device can be used in surgery to adjust the roller pumps by the dynamic calibration method.