A customized stylet for GlideScope® insertion of double lumen tubes
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KeywordsTracheal Intubation Difficult Airway Double Lumen Tube Tube Curvature Tube Exchanger
To the Editor,
We undertook a preliminary study to observe the efficiency of the GR-DLT-S for primary insertion of a DLT with the GLS in patients presenting a normal upper airway. After obtaining Research Ethics Board approval from our institution, 50 adult patients scheduled for thoracic surgery and requiring lung isolation were enrolled after written informed consent. Exclusion criteria included patients with anticipated difficult bag-mask ventilation of the lungs or anticipated difficult tracheal intubation according to the standard criteria,2 such as Mallampati class > 3.
Following application of routine monitors, pre-oxygenation, induction, and paralysis, tracheal intubation with the DLT was undertaken using both the GLS and the GR-DLT-S. Forty-nine (98%) patients received tracheal intubation using the combination of DLT/GLS/GR-DLT-S. The mean time required for intubation was 46.3 (32.3) sec. The number of attempts was one in 37 patients (74%), two in 11 patients (22%), and three in one patient (2%). None of the subjects experienced complications associated with DLT insertion.
Three publications have described the use of the Glidescope® to facilitate DLT tracheal intubation. In 2005, Hernandez et al. described the first use of the GLS to introduce a DLT.3 In 2008, Chen et al. described a failure to insert a DLT with the GLS. They used the GLS to introduce a SLT, and afterwards, they used a tube exchanger to replace the SLT with a DLT, also with the assistance of the GLS.4 Finally, Bustamante et al. described a case report where bending the malleable stylet and sequential rotation of the DLT enabled them to introduce the DLT successfully. These authors reported a dozen successful cases using this technique.5 Over the past five years, we had several cases where we failed to intubate the trachea with a DLT using a similar method. The failed cases involved patients with little room to maneuver the DLT due to a large tongue or a small mouth opening. In these cases, the malleable stylet was not sufficiently rigid to maintain the optimal tube curvature. Since the introduction of the GR-DLT-S, tracheal intubation with the DLT has been successful using this new device in more than 15 patients with either a proven or an anticipated difficult airway.
In conclusion, based on our initial experience, we suggest that the GR-DLT-S is effective when used in combination with the GLS to insert a DLT in patients with a normal upper airway and also in patients with small and anticipated difficult upper airways. An option to consider is the use of the semi-rigid stylet (GR-DLT-S) especially designed to establish and maintain the optimal curvature of the DLT when combined with the GLS.
Intramural departmental sources.
In collaboration with Verathon Medical Canada ULC, the authors designed a new semi-rigid intubating stylet, the GlideRite DLT Stylet® (GR-DLT-S), which can be used for primary DLT intubation with the GLS.
- 1.Aziz MF, Healy D, Kheterpal S, Fu RF, Dillman D, Brambrink AM. Routine clinical practice effectiveness of the Glidescope in difficult airway management: an analysis of 2,004 Glidescope intubations, complications, and failures from two institutions. Anesthesiology 2011; 114: 34-41.PubMedCrossRefGoogle Scholar