Acute and Critical Care

Randomized Controlled Trial

Comparison of Intubation Success Rate and Times Required for Intubation by Glottic Exposure Methods with Glidescope(R): Hyung Seo Jang, Jun Bum Park, Jae Hoon Oh, Chang Sun Kim, Hyuk Joong Choi, Bo Seung Kang, Tae Ho Lim, Hyung Goo Kang; Korean J Crit Care Med. 2013;28(4):241-246.; DOI: https://doi.org/10.4266/kjccm.2013.28.4.241

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Abstract PDF: BACKGROUND
The glottis can be exposed by a Glidescope(R) during endotracheal intubation using either the epiglottis or valleculae elevation method. We compared the epiglottis and valleculae elevation methods for endotracheal intubations performed with a Glidescope(R) using differences in success rate, time spent for tracheal intubation and percent of glottic opening.
METHODS
Forty medical students without experience using a Glidescope(R) participated in this prospective, randomized study in which they intubated a tracheal tube into a manikin. All participants performed tracheal intubation using the 2 forementioned methods. Twenty students exposed the vocal cord by placing the blade tip in the valleculae (valleculae elevation method; VEM). The other 20 students directly elevated the epiglottis with the blade (epiglottis elevation method; EEM). We separated intubating time into 3 parts: turnaround time to exposing the vocal cord, tube passing time and first ventilating time.
RESULTS
The success rate of tracheal intubation using VEM (86.7%, 104/120) was higher than that using EEM (65.8%, 79/120) (p < 0.001). VEM resulted in a lower total intubation time (VEM vs. EEM, 23.5 +/- 5.3 vs. 29.0 +/- 8.7, p = 0.001). The key factor of this difference was the tube passing time (VEM vs. EEM, 7.4 +/- 2.5 vs. 12.8 +/- 7.4, p < 0.001).
CONCLUSIONS
Exposing the vocal cord by using VEM during tracheal intubation with a Glidescope(R) can increase the success rate of tracheal intubation and shorten the time of endotracheal intubation in novices.

Original Articles

Comparison of Cervical Spine Movement by Airway Equipment during Orotracheal Intubation: A Manikin Pilot Study: Sang Hyun Lee, Hyuk Choong Choi, Hyung Goo Kang, Bo Seung Kang, Tai Ho Lim; Korean J Crit Care Med. 2010;25(4):230-234.; DOI: https://doi.org/10.4266/kjccm.2010.25.4.230

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Abstract PDF: BACKGROUND
In patients with limited cervical spine movement, equipment for orotracheal intubation should achieve sufficient laryngeal exposure with the least cervical spine movement. This study was designed to compare movement of the cervical spine during the orotracheal intubation with various intubating equipment.
METHODS
Twelve emergency physicians & residents with a total experience of >50 cases of endotracheal intubation in two emergency centers were assigned to perform orotracheal intubation with four different airway devices, including the Macintosh laryngoscope (ML), DCI video laryngoscope (DCI), Airway Scope (AWS) and Levitan Scope (LS), using the same manikin (Ambu(R) airway management trainer) in random sequences. Movement of the C-spine was examined by measuring the angle formed by two lines which are parallel to the anterior surface of the C2 and C7 vertebrae bodies. The angle was measured when Cormack-Lehane grade II glottis exposure was achieved during intubation.
RESULTS
Mean cervical spine movements were 37.6 +/- 9.2degrees, 32.2 +/- 14.2degrees, 32.2 +/- 6.45degrees and 17.4 +/- 10.0degrees with the ML, DCI (p = 0.347), AWS (p = 0.094), and LS (p < 0.001), respectively, compared to that of ML. Cervical spine movement by LS was 54% less than that by ML. LS produced less cervical spine movement in comparison to DCI (p = 0.013) and AWS (p = 0.001).
CONCLUSIONS
The Levitan Scope produced less movement of the cervical spine when compared to the Macintosh laryngoscope, DCI video-laryngoscope and Airway Scope during orotracheal intubation in a single airway training manikin model.

Evaluation of the Efficacy of the Flexiblade Laryngoscope in Endotracheal Intubation: Sun Young Jang, Sang Kyi Lee; Korean J Crit Care Med. 2001;16(1):42-47.

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Abstract PDF: BACKGROUND
A new laryngoscope, Flexiblade has flexible adjustable rigid blade. The Flexiblade is composed of a handle and a blade with an adjunct trigger. Squeezing the trigger changes the blade curvature from nearly a straight Miller blade into a curved Macintosh blade. This study was designed to evaluate the clinical application of the Flexiblade laryngoscope in endotracheal intubation for adult patients.
METHODS
Following the induction of general anesthesia and muscle paralysis, the laryngoscopic views of 50 patients were measured while five different blade positions in the oral cavity were performed. The laryngoscopic view which was described by Cormack and Lehane was classified from grade 1 to grade 4 except one blade position. Adjusting maneuvers such as laryngeal lift and/or a styletted intubation were used to facilitate a tracheal intubation. Complications which were directly related to the Flexiblade laryngoscope were also evaluated.
RESULTS
In use of the Flexiblade laryngoscope just like straight Miller blade, the vocal cord (< or =grade 2) were exposured in 82% of the patients. The 96% of patients showed a good vocal cord exposure (< or =grade 2) with a partial depression of the triggers of the laryngoscope. Overall rate of a successful intubation was 98%. In partial depression of trigger of the Flexiblade laryngoscope compared with neutral position, 22 patients of 26 patients with laryngoscopic view of grade 2 were improved by one grade, and 15 patients of the 17 patients with laryngoscopic view of grade 3 were improved by more than one grade.
CONCLUSIONS
The Flexiblade laryngoscope is useful for endotracheal intubation for adult patients.

An Anthropometric Measurements of the Upper Airway Using Fiberoptic Laryngoscope in Korean Adults: Sang Kyi Lee, Chun Won Yoo; Korean J Crit Care Med. 1997;12(2):143-150.

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Abstract PDF: Introduction: An anthropometric distance is crucial for an easy endotracheal intubation and correct placement of endotracheal tube in the trachea. There may be a racial difference of the anthropometric measurement. So we measured the anthropometric distances of the upper airway in Korean adult patients.
METHODS
A standard anesthetic induction and maintenance was performed in 100 adult patients following endotracheal intubation. Various anthropometric measurements were determined while the patients head were in a neutral position. Thyromental and sternomental distance were measured. A distance from upper central incisor to carina or cricoid cartilage was directly measured using fiberoptic laryngoscope. However, the length from upper central incisor to midtrachea & the cricoid cartilage-carina distance were indirectly calculated from the above measured distances. Correlation analyses were also performed between age, height, or weight and the above measured anthropometric distances.
RESULTS
The mean distances from upper central incisor to carina, cricoid cartilage or midtrachea were 25.5+/-1.8, 13.9+/-1.9, or 19.8+/-1.8cm respectively. The mean distance from cricoid cartilage to carina was 11.6+/-1.4cm. Thyromental and thyrosternal distance were 6.6+/-0.9 and 15.7+/-1.5cm respectively. All mean anthropometric distances of male were longer than those of female patients. Thirty-eight patients (38%) had the thyromental distance < or = 6cm while one patient (1%) had thyrosternal distance < or = 12.5cm. A good correlation (r< or =0.6) was observed between height and upper central incisor-carina distance.
CONCLUSIONS
This study suggests that these measured anthropometric data are useful for an easy endotracheal intubation and accurate endotracheal placement in the trachea.

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