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Optimal length of the pre-inserted tracheal tube for excellent view in nasal fiberoptic intubation

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Author(s)
Jiwon LeeJung‑Man LeeJeong Jin MinChang‑Hoon KooHyun Jeong Kim
Keimyung Author(s)
Lee, Ji Won
Department
Dept. of Anesthesiology & Pain Medicine (마취통증의학)
Journal Title
Journal of Anesthesia
Issued Date
2016
Volume
30
Issue
2
Keyword
Airway managementFiberoptic intubationBronchoscopeTracheal tubeLaryngeal opening
Abstract
Purpose Inexperienced physicians frequently have difficulty
performing nasal fiberoptic intubation. A pre-inserted
tracheal tube of the appropriate length allows an excellent
view of the laryngeal opening. The purpose of this study
was to determine the ideal length of a pre-inserted tracheal
tube for nasal fiberoptic intubation and to investigate
if it could be predicted from easily measureable patient
parameters.
Methods This was an observational study in which data
on adult patients (n = 150) requiring nasal intubation were
collected and analyzed by stepwise regression. During the
pre-anesthesia examination, a right-angled gauge was used
to measure the distance from the mid-point of the lateral
border of the nares to the tragus of the ear (NT distance)
and to the mandibular angle (NM distance). The distance
from the tragus to the mandibular angle (TM distance)
was also measured. The age, sex, height, and weight of
each patient were recorded. After induction of anesthesia,
the minimum and maximum lengths of the pre-inserted
tracheal tube that provided an excellent view of laryngeal
opening during nasal fiberoptic intubation were measured.
The optimal length was calculated, and an equation was
derived through stepwise regression analysis.
Results The optimal length for each patient could be reliably
predicted using the equation (distances in cm, weight
in kg): optimal length (cm) = 1.952 + 0.051 × height
(cm) + 0.354 × NM distance (cm) − 0.011 × weight (kg)
(r2 = 0.460, P < 0.001).
Conclusion The optimal length of pre-inserted tracheal
tube for nasal fiberoptic intubation can be predicted using
a newly developed formula with three patient parameters,
namely, height, the NM distance, and weight. Application
of this equation in the clinical setting should facilitate nasal
fiberoptic intubation.
Keimyung Author(s)(Kor)
이지원
Publisher
School of Medicine
Citation
Jiwon Lee et al. (2016). Optimal length of the pre-inserted tracheal tube for excellent view in nasal fiberoptic intubation. Journal of Anesthesia, 30(2), 187–192. doi: 10.1007/s00540-015-2088-7
Type
Article
ISSN
0913-8668
Source
http://lps3.dx.doi.org.proxy.dsmc.or.kr/10.1007/s00540-015-2088-7
DOI
10.1007/s00540-015-2088-7
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/33249
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Anesthesiology & Pain Medicine (마취통증의학)
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