A Case of Using Open-Close Valve during One Lung Ventilation: A case report / 대한마취과학회지

One lung ventilation for thoracic surgery may reduce arterial oxygen saturation by ventilation-perfusion mismatching and by increasing intrapulmonary shunting. We experienced a 52 year old male patient with a lung abscess, who showed arterial desaturation after one-lung ventilation. The authors tried to increase arterial oxygen saturation by applying positive end-expiratory pressure (PEEP) and continuous positive airway pressure (CPAP) to dependent and nondependent lung, respectively. However, arterial oxygen saturation did not increase. So, we applied partial differential lung ventilation using an open-close valve designed by the authors, and arterial oxygen saturation increased rapidly. The advantages of the open-close valve are its straightforward use and ease of manipulation. We report a case involving the use of this open-close valve in a desaturated patient during one lung ventilation.

Serum S100 beta Protein as a Marker of Cerebral Damage during Cardiopulmonary Bypass / 대한마취과학회지

BACKGROUND: S100 beta protein has been reported to be an early marker of brain injury. It is released from the glial cell and Schwann cell specifically after brain injury, and it,s serum concentration correlates with the severity of injury. The aim of this study was to measure the serum concentration of S100 beta protein during cardiac surgery and to reveal the correlation between cerebral oxygenation and S100 beta protein. METHODS: Eighteen patients undergoing cardiac surgery using cardiopulmonary bypass (CPB) were enrolled in this study. After induction of general anesthesia, the arterial-jugular venous oxygen difference (AjDO2), regional cerebral oxygen saturation (rSO2) and lactate oxygen index (LOI) were measured. They were measured after induction (T0), during CPB (T1) and at the end of CPB (T2). Serum S100beta protein was measured at T0, T2, T3 (5 hours after CPB), and T4 (24 hours after CPB) using an immunoluminometric assay. We observed correlations between rSO2, AjDO2, LOI and the S100beta protein concentration. RESULTS: Serum concentrations of S100 beta protein were 0.18 +/- 0.20, 5.72 +/- 4.25, 1.06 +/- 1.38 and 0.58 +/- 0.44 (micro gram/L) at T0, T2, T3 and T4 respectively (normal value