O objetivo do presente trabalho consiste em estudar o comportamento térmico das panelas durante as etapas do ciclo operacional utilizando modelos de transferência de calor e simulação computacional. A partir dos resultados do estudo se procurou fazer modificações com o intuito de diminuir as perdas de energia calorífica durante as etapas do processo produtivo. Através da modelagem matemática, medições na planta e simulações computacionais foram determinadas as quedas de temperatura e perdas de calor das panelas. A partir daí foram propostas mudanças operacionais e físicas que após testes práticos e ou simulações computacionais se mostraram eficientes para a diminuição das perdas caloríficas e menor consumo de energia elétrica no forno-panela. Palavras-chave: Panela de aciaria; Simulação computacional; Controle da temperatura em panelas; Ciclo operacional de panelas.
0,05). Os escores da escala de Ramsay não diferiram entre os tipos de opioides utilizados no intraoperatório (p>0,05). CONCLUSÃO: O único fator independentemente associado à dor na sala de recuperação pós-anestésica foi o tipo de opioide utilizado na indução anestésica. A dor pós-operatória ainda é um evento frequente que acomete a maioria dos pacientes e protocolos de analgesia precisam ser implementados para minimizar os efeitos que a dor subtratada pode causar.]]>
BACKGROUND AND OBJECTIVES: Compare anesthesia techniques with sufentanil and intraoperative infusion of remifentanil or dexmedetomidine, and to then analyze their associations with the incidence of pain and other complications in the post-anesthesia care unit. METHODS: A retrospective analytical observational study conducted in a reference center for bariatric surgery in São Paulo, São Paulo State, Brazil. Patients (n=120) included in the study were randomly selected using this site's anesthesia records for bariatric surgery. Four 30-patient groups were established: G1-induction with 0.5 µg.kg-1 sufentanil associated with the continuous infusion of remifentanil; G2-induction with 0.7 µg.kg-1 sufentanil associated with the continuous infusion of remifentanil; G3-induction with 0.5 µg.kg-1 sufentanil associated with the continuous infusion of dexmedetomidine; and G4-induction with 0.7 µg.kg-1 sufentanil associated with the continuous infusion of dexmedetomidine. Significance was set at p<0.05. RESULTS: The incidence of pain in the post-anesthesia care unit was 52.5% (n=63). It was considered intense in 36.11% of these cases. The incidence of pain in the post-anesthesia care unit was lower in patients receiving a continuous infusion of dexmedetomidine relative to those who received remifentanil infusion. Sufentanil dosage in anesthesia induction did not influence the incidence of pain (G1=G2>G3=G4; p<0.05). The occurrence of respiratory complications did not differ significantly between the groups. CONCLUSION: The use of dexmedetomidine proved to be better for analgesia in the post-anesthesia care unit, and it did not increase the risk of respiratory complications when compared to the continuous infusion of remifentanil, regardless of the sufentanil dose used for induction.
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