Gamero F U, Ushizima M R, Cestari I A
Department of Physiology and Biophysics, ICB, University of São Paulo, Brazil.
Artif Organs. 2001 Nov;25(11):890-4. doi: 10.1046/j.1525-1594.2001.06899.x.
A novel optical reflectance transducer for continuous and real time monitoring of oxygen saturation (So2) in extracorporeal tubings during cardiopulmonary bypass (CPB) is described. The optical transducer integrates 2 light-emitting diodes and a photodiode. The transducer is attached to the extracorporeal tubing by a transparent flow through a 3/8 x 3/8 inch connector/cuvette. Four transducers were built and evaluated in vitro in a mock extracorporeal system at a controlled So2. The correlation index (r2) between the So2 measured by the transducers and values determined by a commercial blood gas analyzer was 0.998 with an absolute difference < 0.5%. The performance of the transducer was also evaluated during 16 CPB surgeries in patients with an r2 of 0.873 and an absolute difference < 3.5%. The results obtained demonstrate the applicability of the optical reflectance transducer for monitoring So2 in the tubings of the CPB circuit.
描述了一种新型光学反射换能器，用于在体外循环（CPB）期间连续实时监测体外管道中的氧饱和度（So2）。该光学换能器集成了2个发光二极管和1个光电二极管。换能器通过一个透明流路，经3/8×3/8英寸连接器/比色皿连接到体外管道。制作了4个换能器，并在体外模拟系统中于受控的So2条件下进行了体外评估。换能器测得的So2与商用血气分析仪测定值之间的相关指数（r2）为0.998，绝对差值<0.5%。在16例CPB手术患者中对换能器的性能也进行了评估，r2为0.873，绝对差值<3.5%。所获得的结果证明了光学反射换能器在监测CPB回路管道中So2方面的适用性。
