“…One of the positive features of the Taper guard Evac tracheal tubes used in this study is the shape of the cuff, which is a tapered shape, and at least one place in the trachea is completely fitted with this cuff, and leakage does not occur from this area, and therefore microaspiration Also, these tubes suck subglottic secretions and probably for these reasons, the relative success of this group was achieved in this study. However, the higher mortality in this group is probably related to the design of this tracheal tube, which has a separate lumen for suctioning secretions, but this lumen has led to an increase in the thickness of the tube and its hardness, and as a result, mucosal damage to the trachea increases [11] [12].…”