Contrast in respiratory mechanics and blood gas between bronchial blocker and double lumen tube in one lung ventilation

Abstract

Objective To compare the influences between bronchial blocker (BB) and double lumen tube (DLT) in respiratory mechanics and blood gas in one lung ventilation. Methods Thirty-six patients undergoing pulmonary lobectomy or radical operation of esophageal carcinoma were randomized into group BB (17 cases) and group DLT (19 cases). In group BB,BB was intubated under the guidance of a fibreoptic bronchoscope after intubation of single lumen tube; while in group DLT, the position of the tube was confirmed using fibreoptic bronchoscopy after intubation. The peek airway pressure (Pmax) and pulmonary dynamic compliance (CLdyn) during double lung ventilation and one lung ventilation were recorded in recumbent position. Blood samples were taken from, radial artery 20 min after one lung ventilation for blood gas analysis,partial pressure of oxygen in artery(PaO2), partial pressure of carbon dioxide in artery(PaCO2), saturation of arterial blood oxygen (SaO2) were recorded. Results No significant difference was found in Pmax and CLdyn between two groups during double lung ventilation,but Pmax was significantly lower in group BB [(21.00 ± 3.59) cm H2O,1 cm H2O = 0.098 kPa] than that in group DLT [(26.89 ±4.21) cm H2O] (P＜0.05), and CLdyn was greater in group BB [(28.10 ±6.24) ml/cm H2O] than that in group DLT [(24.00±7.13) ml/cm H2O ] (P ＜ 0.05); there were no significant differences in PaO2, PaCO2, SaO2 betweentwo groups during one lung ventilation (P＞ 0.05). Conclusion The influence to respiratory mechanics in one lung ventilation is smaller using BB than using DLT, BB has blocker well applicable value in clinics. Key words: Bronchial blocker; Double lumen tube; One lung ventilation