• Yansong Li, Ying Xie, and Xinchuan Wei.
• Department of Anesthesiology, West China Hospital of Sichuan University, 610041, ChengDu, China. liyansong.inter@163.com
• J Anesth. 2013 Aug 1;27(4):557-62.

PurposeNowadays the size of the streamlined liner of the pharynx airway (SLIPA™) is selected by matching the width of the thyroid cartilage of the patient to the widest dimension of the SLIPA™. The objective of this work was to improve the method of selection by matching the distance between the otobasion inferius and the most inferior margin of the cricoid cartilage (O-C) to the length of the SLIPA™ chamber.Methods100 patients (ASAI-II) scheduled to undergo operations under general anesthesia were randomly divided into two groups, group A (size selected by matching O-C with SLIPA™ chamber length, n = 50) and group B (size selected by matching the width of the thyroid cartilage with the widest dimension of the SLIPA™, n = 50). We measured the distance between the nasopharynx and the interarytenoid fold (N-I) and investigated the correlation between O-C and N-I at the neutral head position. Number of attempts, insertion time, blood on the device, leakage, and the need to change sizes were assessed.ResultsA positive correlation (r = 0.68, p < 0.05) was detected between N-I and O-C. Leakage was observed in 6 % (n = 3) of group A patients and in 20 % (n = 10) of group B patients (p < 0.05).ConclusionCompared with the classic size-selection method, matching the width of the thyroid cartilage with that of the SLIPA™, the size-selection method of matching SLIPA™ chamber length to O-C for adult patients is more accurate.

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