Determination of pressure in a non-ventilated lung using high-flow oxygen insufflation during one-lung ventilation in videothoracoscopic surgery

The objective was to determine the pressure in the non-ventilated lung using different flows of high flow oxygen insufflation (HFOI) during one-lung ventilation. Materials and methods . The study included 20 patients who underwent videothoracoscopic lobectomy for malignant tumors of the peripheral bronchus. After induction of anesthesia, direct sequential laryngoscopy and tracheal intubation were performed: 1) installation of a double-lumen tube (DLT); 2) verification of the correctness of the installation using a video bronchoscope. All patients were given HFOI to the non-ventilated lung via the DLT circuit. The study was divided into seven stages, at each of which HFOI was performed for 10 minutes and the pressure in the non-ventilated lung was recorded: stage I – 80 l/min, stage II – 70 l/min, stage III – 60 l/min, stage IV – 50 l/min, stage V – 40 l/min, stage VI – 30 l/min, stage VII – 20 l/min. Results . At stage I of the study with HFOI of 80 l/min, the pressure in the non-ventilated lung was 2 ± 0 cm Н 2 О, at stages II – VI (HFOI in the range from 70 to 30 l/min) – 1.0 ± 0 centimeter of water column and at stage VII (HFOI 20 l/min) – 0 ± 0 cm Н 2 О. Conclusion . The pressure in the non-ventilated lung when using high-flow oxygen insufflation under one-lung ventilation at a flow rate of 80 l/min is 2 cm Н 2 О, from 30 to 70 l/min – 1 cm Н 2 О, 20 l/min – 0 cm Н 2 О.