Levin E, Muravchick S, Gold M I
Anesth Analg. 1981 Nov;60(11):814-7.
Density and specific gravity (SG) were determined at two or more temperatures between 23 and 37 C for 15 samples of normal human cerebrospinal fluid (CSF) and CSF mixed with tetracaine, and for tetracaine solutions commonly used for spinal anesthesia. Density was determined from measured weight and volume, and SG was calculated using the density of water at the same temperature. With 95% confidence limits, SG of normal human CSF at 37 C ranges from 1.0063 to 1.0075, less variation than previously reported. Changes in temperature altered the densities of dextrose, tetracaine, and CSF, alone or in combination, in a parallel manner, but SG remained constant for each solution over the observed temperature range.
在23至37摄氏度之间的两个或多个温度下，测定了15份正常人脑脊液（CSF）样本、与丁卡因混合的脑脊液样本以及常用于脊髓麻醉的丁卡因溶液的密度和比重（SG）。通过测量重量和体积来确定密度，并使用相同温度下水的密度计算比重。在95%置信区间内，37摄氏度时正常人脑脊液的比重范围为1.0063至1.0075，变化比先前报道的要小。温度变化以平行方式单独或联合改变了葡萄糖、丁卡因和脑脊液的密度，但在观察到的温度范围内，每种溶液的比重保持恒定。
