title: [Intraoperative monitoring of pressure within saline-filled, endotracheal tube cuff in adult patients undergoing CO2 laser laryngomicrosurgery].
abstract: In laser laryngomicrosurgery, saline is injected into the endotracheal tube cuff to prevent airway fire. Utilizing regression analyses, we investigated the relation between the saline volume required to obtain optimal intracuff pressure and tracheal diameters in patients undergoing laser laryngomicrosurgery as well as in model tracheas. Although excellent linear correlations were found between the saline volume and the diameter of model tracheas, no significant linear or non-linear correlation was found between the saline volume and the patient's tracheal diameter. In the model tracheas, a rate of rise in the intracuff pressure caused by increments in the injected volume was far steeper when saline was injected into the cuff than when air was injected into the cuff. Addition of only 0.2 ml saline could result in large (> 50 mmHg) increases in the intracuff pressure. Also in patients, addition of 1 ml could result in notable (> 50 mmHg) increases in the intracuff pressure. These results suggest that the saline volume necessary to obtain optimal intracuff pressure is difficult to be predicted from the patient's tracheal diameter, and that slight increases in the saline volume may cause excessive increases in the intracuff pressure. The intracuff pressure should be tightly monitored in patients undergoing laser laryngomicrosurgery.
authors.affiliation: Department of Anesthesiology and Critical Care Medicine, Kyushu University Hospital, Faculty of Medicine, Kyushu University, Fukuoka 812-8582.
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Matsuo
authors.forename: Takasi
authors.initials: T
authors.lastname: Akata
authors.forename: Ken
authors.initials: K
authors.lastname: Yamaura
authors.forename: Keiko
authors.initials: K
authors.lastname: Morikawa
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kandabashi
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Ueda
authors.forename: Kohei
authors.initials: K
authors.lastname: Tohyama
authors.forename: Shosuke
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000295:instrumentation*; D007825:Laryngectomy / Q000379:methods*; D053685:Laser Therapy; D008297:Male; D008365:Manometry / Q000379:methods; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D011237:Predictive Value of Tests; D012965:Sodium Chloride
chemical_list: D012965:Sodium Chloride