期刊
BRITISH JOURNAL OF ANAESTHESIA
卷 84, 期 1, 页码 28-32出版社
PROF SCI PUBL
DOI: 10.1093/oxfordjournals.bja.a013376
关键词
blood, specific heat capacity; blood, packed cell volume; heart, cardiopulmonary bypass; temperature, body; temperature, regulation
Extracorporeal circuits such as cardiopulmonary bypass (CPB) and renal dialysis machines cause active and/or passive loss of body heat. Attempts to quantify this heat. loss are generally based on the Fick principle which requires knowledge of the specific heat capacity (SHC) of blood. As changes in packed cell volume are common, we investigated the effect of these changes on the SHC of blood over a range of packed cell volumes (PCV) from whole blood at 43.1% (3594 J kg(-1) degrees C-1) to pure Hartmann's solution (4153 J kg(-1) degrees C-1). The SHC of other fluids used during CPB was also measured and found to be 4139 J kg(-1) degrees C-1 and 4082 J kg(-1) degrees C-1 far normal saline and Gelofusine, respectively. The maximum variability in SHC over the range of PCV values encountered during CPB was calculated to be small (5.5%). We conclude that: use of a constant value of SHC for calculation of thermal energy transfer is currently justified.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据