| Factors Affecting the Intracuff Pressure of Wire-reinforced Endotracheal Tubes during General Anesthesia Using Nitrous Oxide. |
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Sinyoung Kang, Hee Jung Baik, Yun Jin Kim, Jong Hak Kim |
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Department of Anesthesiology, Ewha Womans University Medical Center, College of Medicine, Ewha Womans University, Seoul, Korea. baikhj@ewha.ac.kr. |
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| Abstract |
BACKGROUND
We evaluated the factors affecting the need for cuff deflation to maintain intracuff pressure (P(cuff)) below 22 mmHg in two types of wire-reinforced endotracheal tubes; type A: Safety-Flex(TM) (Mallinckrodt, Athlone, Ireland) and type B: Insung(R) (Insung, Seoul, Korea).
METHODS
Eighty patients were randomly divided into four groups (n = 20 for each); Group F-A: female, type A; Group F-B: female, type B; Group M-A: male, type A; Group M-B: male, type B. Sealing volume and sealing pressure (SP) were measured. Whenever Pcuff reached 22 mmHg during N2O administration, the cuff was deflated to SP. Elapsed time to first deflation (1-CP22) and deflation frequencies were recorded.
RESULTS
Specific cuff compliance (C(cuff)) was higher in type A than that in type B (P < 0.05). More patients in Group F-B and M-B needed deflation than those in Group F-A and M-A, respectively (P < 0.05). 1-CP22 in patients intubated with type B was shorter than with type A (P < 0.05). In both tubes type A and B, SP was higher in patients who needed deflation compared to ones that did not (P < 0.05).
CONCLUSIONS
Use of wire-reinforced tubes with high C(cuff) decreases the frequency of deflation. Low SP also reduces the need for cuff deflation to keep the P(cuff) below 22 mmHg during N2O anesthesia. |
| Key Words:
endotracheal intubation; general anesthesia; nitrous oxide |
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