Conclusion
It is important to prevent desaturation in order to ensure process safety and comfort during the EBUS-TBNA under intravenous sedation. Our study showed that Oxygen delivery via nCPAP was shortened the mean desaturation time during EBUS-TBNA when compared with Oxygen delivery through a simple mask at the same dose of anesthetic drugs. We advise the use of nCPAP during EBUS-TBNA under intravenous sedation to all patients. And we strongly suggest that the patients with high Mallampati score will benefit from nCPAP.