A thermodynamic assessment of therapeutic hypothermia techniques

Autor(es)

Keutenedjian Mady, Carlos Eduardo ^{[1, 2]} ; Henriques, Izabela Batista ^[1] ; de Oliveira, Jr., Silvio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Polytech Sch, BR-05508900 Sao Paulo - Brazil

^[2] Univ Estadual Campinas, Fac Mech Engn, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENERGY; v. 85, p. 392-402, JUN 1 2015.
• Citações Web of Science: 2

Resumo

According to literature, therapeutic hypothermia has been applied for treating conditions that causes an interruption in the delivery of oxygen to the brain, giving the patient better chances of survival with a neurological recovery and without any irreversible damage to the brain. Hypothermia is also used during surgeries and circulatory arrest. In this article, the objective temperature of hypothermia is 32 degrees C, which is considered mild: 32-35 degrees C. Three techniques of hypothermia induction were considered: external blood cooling, endovascular cooling with a catheter insertion and water bath. Energy and exergy analyses were performed to determine the clinical effectiveness of these techniques and to evaluate the best test parameters, from which it was possible to calculate the body internal temperature, destroyed exergy and exergy efficiency. Moreover, it was proposed an exergy performance index, which takes into account the ability of a given technique to change the exergy of the body. Results indicate that therapeutic hypothermia takes the subject to a state of lower destroyed exergy and higher body exergy efficiency. The exergy performance index shows that lower rates of cooling lead to a better transformation of the exergy removed from the body into variation of the body exergy. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/17578-0 - Indicadores termodinâmicos para realização de diagnóstico de patologias: aplicações às patologias provocadas por desequilíbrios ambientais urbanos
• Beneficiário: Carlos Eduardo Keutenedjian Mady
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 14/11142-3 - Estudo comparativo do comportamento exergético de um anfíbio com o do ser humano
• Beneficiário: Carlos Eduardo Keutenedjian Mady
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado