 This study found that the cuff pressure needed to fully seal the airway using the minimal occlusive volume MOV technique was significantly lower than the cuff pressure needed to do so using the spirometer technique. The MOV technique required a cuff pressure of 16.7 cmH2O while the spirometer technique required a cuff pressure of 18.7 cmH2O. This means that the spirometer technique requires a cuff pressure that is 2.0 cmH2O higher than the MOV technique and this difference is statistically significant p equals 0.003. Therefore, when using the spirometer technique, it is necessary to increase the cuff pressure by approximately 4 cmH2O in order to ensure complete airway sealing. This article was authored by Hyoyeon Park, Mina Kim, and Jun Yeong In.