Repeated attempts improve tracheal tube insertion time using the intubating laryngeal airway in a mannequin.

STUDY OBJECTIVE: To determine if repeated performance of endotracheal tube insertion via the intubating laryngeal airway (ILA) would shorten insertion time in mannequins. DESIGN: Prospective study. SETTING: Clinical Skills Laboratory, Department of Anesthesia, Toronto Western Hospital. PARTICIPANTS: 65 department anesthesiologists. MEASUREMENTS: After a video training session, anesthesiologists with no previous experience with the ILA performed 5 consecutive ILA-guided tracheal tube intubations on a mannequin. Each participant completed Task 1: insertion of an ILA; Task 2: blind insertion of a tracheal tube through the ILA, and Task 3: removal of the ILA. The time required for each task and the total intubation time for the three tasks over the 5 attempts were recorded. These times were compared using repeated-measures analysis of variance. The success rate among the 5 attempts was compared using Chi-Square analyses. MAIN RESULTS: A total of 65 anesthesiologists performed 5 ILA-guided tracheal intubations each. Total intubation time decreased from the first to the fifth attempt (92.6 ± 22.7 sec, 74.5 ± 19.2 sec, 66.5 ± 16.5 sec, 65.9 ± 19.9 sec, and 60.8 ± 16.3 sec; P < 0.001). Significant differences in intubation times were noted between the first and second, and the second and third attempts (P < 0.001 and P = 0.02, respectively). The success rate did not change over the 5 attempts (84.6%, 89.2%, 84.6%, 89.2%, and 90.8%; P = 0.737). CONCLUSIONS: Total intubation time decreased by 34% (92.6 to 60.8 sec) over the 5 attempts in mannequins. The success rate ranged from 84.6% to 90.8% and did not differ significantly over the 5 attempts.

Improved esophageal patency when inserting the ProSeal laryngeal mask airway with an Eschmann tracheal tube introducer.

PURPOSE: We hypothesized that a more accurate alignment of the tip of the drain tube with the upper esophageal opening would be achieved in adult patients, as confirmed by fibreoptic bronchoscopy, by placing the ProSeal laryngeal mask airway (PLMA) by means of guiding it over an Eschmann tracheal tube introducer, commonly know as a gum elastic bougie (GEB), that was previously inserted into the esophagus, rather than by placing the PLMA with a curved metal introducer (IT). METHODS: Seventy-five adult elective surgery patients, whose airway management involved a PLMA, were randomly allocated to either the GEB- or IT-guided techniques. After inserting the PLMA, alignment of the tip of the drain tube relative to the esophageal opening was verified by a fibrescope introduced through the drain tube. Placing the fibrescope through the PLMA identified the glottic structures. The primary endpoint indicating the proper alignment of the tip of the drain tube of the PLMA with the upper esophageal opening was the ability to pass the fibrescope into the esophagus through the drain tube by a distance >35 cm without obstruction and the ability to simultaneously visualize the esophageal mucosa. RESULTS: The overall success rates of PLMA insertion were similar in the GEB and IT groups. However, the mean airway insertion times were longer with the GEB than with the IT-PLMA. The GEB group achieved proper alignment of the drain tube and the upper esophageal opening more frequently than the IT group (97% confidence interval (CI(95)) 91.5-100% vs 81% CI(95) 68.5-93.5% of subjects, respectively; P = 0.027). When the GEB was used to place the PLMA, the patients' vocal cords were visualized more frequently than when the IT technique was used (100% vs 73% CI(95) 58.9-87.1% of subjects, respectively; P = 0.003). CONCLUSION: Fibreoptic bronchoscopy confirmed that GEB is superior to the IT technique in ensuring precise alignment of the tip of the drain tube of the PLMA with the upper esophageal opening. Accurate positioning may better preserve gastroesophageal drainage function of the PLMA.

Lighted stylet-guided intubation via the intubating laryngeal airway in a patient with Hallermann-Streiff syndrome.

PURPOSE: Hallermann-Streiff syndrome is a congenital syndrome associated with oculomandibulofacial abnormalities and potentially difficult airways. This case report describes the novel use of a lighted stylet-guided tracheal tube insertion through a new supraglottic airway, the intubating laryngeal airway (ILA), in a patient with Hallermann-Streiff syndrome who had anticipated difficult airway. CLINICAL FEATURES: A 26-year-old male with Hallermann-Streiff syndrome was scheduled for a vitrectomy. The patient had mandibulofacial dystocia with a bird-like appearance, a mouth opening of 4 cm, a receding chin, and a Mallampati class 3 examination. The surgeon requested muscle paralysis and no movement during surgery. After receiving midazolam, fentanyl and propofol, a size 3.5 ILA was inserted and lung ventilation was easy to perform. A 7.5-mm internal diameter tracheal tube was mounted on a lighted stylet with its inner rigid stylet removed. After succinylcholine administration, the lighted stylet-tracheal tube assembly was inserted via the ILA until the transillumination just vanished below the sternal notch. The lighted stylet was removed, the circuit was connected, and capnography confirmed tracheal placement of tube. The ILA was deflated and left in situ. Upon emergence from anesthesia, the tracheal tube, and subsequently the ILA, were removed without complications. CONCLUSIONS: This case presents a novel use of a lighted stylet-guided tracheal tube insertion through the ILA in a patient with Hallermann-Streiff syndrome. This intubation technique can be considered in patients with difficult airways as a primary route of intubation, or as a secondary rescue strategy.