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Devices for difficult emergency airway management in adults

INTRODUCTION

Emergency clinicians commonly encounter difficult airways. Estimates run as high as 20 percent for difficult airways [1] and approximately 1 percent for failed airways [2]. Difficulty in airway management is variably defined, and includes the need for excess lifting force, poor view of the vocal cords, multiple or prolonged attempts, multiple operators, and the use of multiple intubating devices.

A wide range of devices have been developed to aid in the management of the difficult airway. They incorporate a variety of fiberoptic, video, optical, and mechanical technologies to enable the operator to obtain a better view of the larynx and facilitate passage of an endotracheal tube (ETT) into the trachea. These devices are useful for management of the difficult or failed airway and for routine intubation.

This topic review will discuss the types of devices designed to facilitate management of difficult and failed airways. The overall approach to the management of such airways is reviewed elsewhere. (See "The difficult airway in adults" and "The failed airway in adults" and "The difficult pediatric airway".)

STYLETS

We define a stylet as a device loaded within the lumen of an endotracheal tube (ETT) in order to assist tracheal placement. A standard malleable metal stylet is inserted into an ETT to lend greater stiffness and thereby improve control. In contrast, specialized stylets facilitate intubation in situations of poor glottic exposure and if adapted with advanced optics, can provide a better view of the glottis than is obtained with direct laryngoscopy.

Endotracheal tube introducers (gum elastic bougie) — The endotracheal tube introducer (ETI) is an effective and inexpensive adjunct to difficult airway management that is easy to use. We recommend that an ETI be readily available in every emergency department. The technique for using these devices and evidence of their effectiveness are reviewed separately. (See "Endotracheal tube introducers (gum elastic bougie) for emergency intubation".)

            

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Literature review current through: Jun 2014. | This topic last updated: Jul 17, 2014.
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References
Top
  1. Murphy, M, Walls, RM. Identification of the Difficult and Failed Airway. In: Manual of Emergency Airway Management, 3rd, Walls, R, Murphy, MF (Eds), Lippincott, Williams and Wilkins, Philadelphia 2008. p.81.
  2. Sagarin MJ, Barton ED, Chng YM, et al. Airway management by US and Canadian emergency medicine residents: a multicenter analysis of more than 6,000 endotracheal intubation attempts. Ann Emerg Med 2005; 46:328.
  3. Soh CR, Kong CF, Kong CS, et al. Tracheal intubation by novice staff: the direct vision laryngoscope or the lighted stylet (Trachlight)? Emerg Med J 2002; 19:292.
  4. Margolis GS, Menegazzi J, Abdlehak M, Delbridge TR. The efficacy of a standard training program for transillumination-guided endotracheal intubation. Acad Emerg Med 1996; 3:371.
  5. Wik L, Naess AC, Steen PA. Intubation with laryngoscope versus transillumination performed by paramedic students on manikins and cadavers. Resuscitation 1997; 33:215.
  6. Hung OR, Pytka S, Morris I, et al. Clinical trial of a new lightwand device (Trachlight) to intubate the trachea. Anesthesiology 1995; 83:509.
  7. Berns SD, Patel RI, Chamberlain JM. Oral intubation using a lighted stylet vs direct laryngoscopy in older children with cervical immobilization. Acad Emerg Med 1996; 3:34.
  8. Tsutsui T, Setoyama K. [A clinical evaluation of blind orotracheal intubation using Trachlight in 511 patients]. Masui 2001; 50:854.
  9. Hung OR, Pytka S, Morris I, et al. Lightwand intubation: II--Clinical trial of a new lightwand for tracheal intubation in patients with difficult airways. Can J Anaesth 1995; 42:826.
  10. Kanaide M, Fukusaki M, Tamura S, et al. Hemodynamic and catecholamine responses during tracheal intubation using a lightwand device (Trachlight) in elderly patients with hypertension. J Anesth 2003; 17:161.
  11. Rhee KY, Lee JR, Kim J, et al. A comparison of lighted stylet (Surch-Lite) and direct laryngoscopic intubation in patients with high Mallampati scores. Anesth Analg 2009; 108:1215.
  12. Amornyotin S, Sanansilp V, Amorntien V, Tirawat P. Effectiveness of lightwand (Trachlight) intubation by 1st year anesthesia residents. J Med Assoc Thai 2002; 85 Suppl 3:S963.
  13. Konishi A, Kikuchi K, Sasui M. [Cervival spine movement during light-guided orotracheal intubation with lightwand stylet (Trachlight)]. Masui 1998; 47:94.
  14. Turkstra TP, Pelz DM, Shaikh AA, Craen RA. Cervical spine motion: a fluoroscopic comparison of Shikani Optical Stylet vs Macintosh laryngoscope. Can J Anaesth 2007; 54:441.
  15. Turkstra TP, Craen RA, Pelz DM, Gelb AW. Cervical spine motion: a fluoroscopic comparison during intubation with lighted stylet, GlideScope, and Macintosh laryngoscope. Anesth Analg 2005; 101:910.
  16. Hirabayashi Y, Hiruta M, Kawakami T, et al. Effects of lightwand (Trachlight) compared with direct laryngoscopy on circulatory responses to tracheal intubation. Br J Anaesth 1998; 81:253.
  17. Kihara S, Brimacombe J, Yaguchi Y, et al. Hemodynamic responses among three tracheal intubation devices in normotensive and hypertensive patients. Anesth Analg 2003; 96:890.
  18. Favaro R, Tordiglione P, Di Lascio F, et al. Effective nasotracheal intubation using a modified transillumination technique. Can J Anaesth 2002; 49:91.
  19. Fan KH, Hung OR, Agro F. A comparative study of tracheal intubation using an intubating laryngeal mask (Fastrach) alone or together with a lightwand (Trachlight). J Clin Anesth 2000; 12:581.
  20. Agrò F, Hung OR, Cataldo R, et al. Lightwand intubation using the Trachlight: a brief review of current knowledge. Can J Anaesth 2001; 48:592.
  21. Hung OR, Stewart RD. Lightwand intubation: I--a new lightwand device. Can J Anaesth 1995; 42:820.
  22. Phua DS, Mah CL, Wang CF. The Shikani optical stylet as an alternative to the GlideScope® videolaryngoscope in simulated difficult intubations--a randomised controlled trial. Anaesthesia 2012; 67:402.
  23. Kok T, George RB, McKeen D, et al. Effectiveness and safety of the Levitan FPS Scope™ for tracheal intubation under general anesthesia with a simulated difficult airway. Can J Anaesth 2012; 59:743.
  24. Kimura A, Yamakage M, Chen X, et al. Use of the fibreoptic stylet scope (Styletscope) reduces the hemodynamic response to intubation in normotensive and hypertensive patients. Can J Anaesth 2001; 48:919.
  25. Gravenstein D, Liem EB, Bjoraker DG. Alternative management techniques for the difficult airway: optical stylets. Curr Opin Anaesthesiol 2004; 17:495.
  26. Levitan RM, Kush S, Hollander JE. Devices for difficult airway management in academic emergency departments: results of a national survey. Ann Emerg Med 1999; 33:694.
  27. Birmingham B, Mentzer SJ, Body SC. Laryngeal mask airway for therapeutic fiberoptic bronchoscopic procedures. J Cardiothorac Vasc Anesth 1996; 10:519.
  28. Benumof JL. A new technique of fiberoptic intubation through a standard LMA. Anesthesiology 2001; 95:1541.
  29. Ianchulev SA. Through-the-LMA fiberoptic intubation of the trachea in a patient with an unexpected difficult airway. Anesth Analg 2005; 101:1882.
  30. Jöhr M, Berger TM. Fiberoptic intubation through the laryngeal mask airway (LMA) as a standardized procedure. Paediatr Anaesth 2004; 14:614.
  31. Hershey MD, Hannenberg AA. Gastric distention and rupture from oxygen insufflation during fiberoptic intubation. Anesthesiology 1996; 85:1479.
  32. Afilalo M, Guttman A, Stern E, et al. Fiberoptic intubation in the emergency department: a case series. J Emerg Med 1993; 11:387.
  33. Mlinek EJ Jr, Clinton JE, Plummer D, Ruiz E. Fiberoptic intubation in the emergency department. Ann Emerg Med 1990; 19:359.
  34. Schafermeyer RW. Fiberoptic laryngoscopy in the emergency department. Am J Emerg Med 1984; 2:160.
  35. Blanda M, Gallo UE. Emergency airway management. Emerg Med Clin North Am 2003; 21:1.
  36. Hamilton PH, Kang JJ. Emergency airway management. Mt Sinai J Med 1997; 64:292.
  37. Russi CS, Miller L, Hartley MJ. A comparison of the King-LT to endotracheal intubation and Combitube in a simulated difficult airway. Prehosp Emerg Care 2008; 12:35.
  38. Asai T, Shingu K. The laryngeal tube. Br J Anaesth 2005; 95:729.
  39. Calkins MD, Robinson TD. Combat trauma airway management: endotracheal intubation versus laryngeal mask airway versus combitube use by Navy SEAL and Reconnaissance combat corpsmen. J Trauma 1999; 46:927.
  40. Lighthall G, Harrison TK, Chu LF. Videos in clinical medicine: Laryngeal mask airway in medical emergencies. N Engl J Med 2013; 369:e26.
  41. Fukutome T, Amaha K, Nakazawa K, et al. Tracheal intubation through the intubating laryngeal mask airway (LMA-Fastrach) in patients with difficult airways. Anaesth Intensive Care 1998; 26:387.
  42. Parmet JL, Colonna-Romano P, Horrow JC, et al. The laryngeal mask airway reliably provides rescue ventilation in cases of unanticipated difficult tracheal intubation along with difficult mask ventilation. Anesth Analg 1998; 87:661.
  43. Jones JR. Laryngeal mask airway: an alternative for the difficult airway. AANA J 1995; 63:444.
  44. Asai T, Appadurai I. LMA for failed intubation. Can J Anaesth 1993; 40:802; author reply 803.
  45. Levy DM. LMA for failed intubation. Can J Anaesth 1993; 40:801.
  46. Brimacombe J, Berry A. LMA for failed intubation. Can J Anaesth 1993; 40:802.
  47. Rosenblatt WH, Murphy M. The intubating laryngeal mask: use of a new ventilating-intubating device in the emergency department. Ann Emerg Med 1999; 33:234.
  48. Levitan RM, Ochroch EA, Stuart S, Hollander JE. Use of the intubating laryngeal mask airway by medical and nonmedical personnel. Am J Emerg Med 2000; 18:12.
  49. Foley LJ, Ochroch EA. Bridges to establish an emergency airway and alternate intubating techniques. Crit Care Clin 2000; 16:429.
  50. Stanwood PL. The laryngeal mask airway and the emergency airway. AANA J 1997; 65:364.
  51. Young B. The intubating laryngeal-mask airway may be an ideal device for airway control in the rural trauma patient. Am J Emerg Med 2003; 21:80.
  52. Ferson DZ, Rosenblatt WH, Johansen MJ, et al. Use of the intubating LMA-Fastrach in 254 patients with difficult-to-manage airways. Anesthesiology 2001; 95:1175.
  53. Wakeling HG, Bagwell A. The intubating laryngeal mask (ILMA) in an emergency failed intubation. Anaesthesia 1999; 54:305.
  54. Joo HS, Rose DK. The intubating laryngeal mask airway with and without fiberoptic guidance. Anesth Analg 1999; 88:662.
  55. Asai T, Morris S. The laryngeal mask airway: its features, effects and role. Can J Anaesth 1994; 41:930.
  56. Gatward JJ, Cook TM, Seller C, et al. Evaluation of the size 4 i-gel airway in one hundred non-paralysed patients. Anaesthesia 2008; 63:1124.
  57. Theiler LG, Kleine-Brueggeney M, Kaiser D, et al. Crossover comparison of the laryngeal mask supreme and the i-gel in simulated difficult airway scenario in anesthetized patients. Anesthesiology 2009; 111:55.
  58. Theiler L, Gutzmann M, Kleine-Brueggeney M, et al. i-gel™ supraglottic airway in clinical practice: a prospective observational multicentre study. Br J Anaesth 2012; 109:990.
  59. Middleton PM, Simpson PM, Thomas RE, Bendall JC. Higher insertion success with the i-gel(®) supraglottic airway in out-of-hospital cardiac arrest: A randomised controlled trial. Resuscitation 2014; 85:893.
  60. Halwagi AE, Massicotte N, Lallo A, et al. Tracheal intubation through the I-gel™ supraglottic airway versus the LMA Fastrach™: a randomized controlled trial. Anesth Analg 2012; 114:152.
  61. Law J, Bair A, Capra J, et al. Characterization of airway device cuff volumes at simulated altitude. Aviat Space Environ Med 2011; 82:555.
  62. McQuibban GA. LMA-FasTrach. Can J Anaesth 1998; 45:95.
  63. Pollack CV Jr. The laryngeal mask airway: a comprehensive review for the Emergency Physician. J Emerg Med 2001; 20:53.
  64. Okuda K, Inagawa G, Miwa T, Hiroki K. Influence of head and neck position on cuff position and oropharyngeal sealing pressure with the laryngeal mask airway in children. Br J Anaesth 2001; 86:122.
  65. Keller C, Brimacombe J. The influence of head and neck position on oropharyngeal leak pressure and cuff position with the flexible and the standard laryngeal mask airway. Anesth Analg 1999; 88:913.
  66. Brimacombe J, Berry A. Leak reduction with the LMA. Can J Anaesth 1996; 43:537.
  67. Ramachandran SK, Mathis MR, Tremper KK, et al. Predictors and clinical outcomes from failed Laryngeal Mask Airway Unique™: a study of 15,795 patients. Anesthesiology 2012; 116:1217.
  68. Teoh WH, Lim Y. Comparison of the single use and reusable intubating laryngeal mask airway. Anaesthesia 2007; 62:381.
  69. Turan A, Kaya G, Koyuncu O, et al. Comparison of the laryngeal mask (LMA) and laryngeal tube (LT) with the new perilaryngeal airway (CobraPLA) in short surgical procedures. Eur J Anaesthesiol 2006; 23:234.
  70. Kurola J, Pere P, Niemi-Murola L, et al. Comparison of airway management with the intubating laryngeal mask, laryngeal tube and CobraPLA by paramedical students in anaesthetized patients. Acta Anaesthesiol Scand 2006; 50:40.
  71. Genzwuerker HV, Fritz A, Hinkelbein J, et al. Prospective, randomized comparison of laryngeal tube and laryngeal mask airway in pediatric patients. Paediatr Anaesth 2006; 16:1251.
  72. Klaver NS, Kuizenga K, Ballast A, Fidler V. A comparison of the clinical use of the Laryngeal Tube S and the ProSeal Laryngeal Mask Airway by first-month anaesthesia residents in anaesthetised patients. Anaesthesia 2007; 62:723.
  73. Yildiz TS, Solak M, Toker K. Comparison of laryngeal tube with laryngeal mask airway in anaesthetized and paralysed patients. Eur J Anaesthesiol 2007; 24:620.
  74. Dhonneur G, Ndoko SK, Yavchitz A, et al. Tracheal intubation of morbidly obese patients: LMA CTrach vs direct laryngoscopy. Br J Anaesth 2006; 97:742.
  75. Agro F, Frass M, Benumof JL, Krafft P. Current status of the Combitube: a review of the literature. J Clin Anesth 2002; 14:307.
  76. Lefrançois DP, Dufour DG. Use of the esophageal tracheal combitube by basic emergency medical technicians. Resuscitation 2002; 52:77.
  77. Davis DP, Valentine C, Ochs M, et al. The Combitube as a salvage airway device for paramedic rapid sequence intubation. Ann Emerg Med 2003; 42:697.
  78. Rabitsch W, Schellongowski P, Staudinger T, et al. Comparison of a conventional tracheal airway with the Combitube in an urban emergency medical services system run by physicians. Resuscitation 2003; 57:27.
  79. Blostein PA, Koestner AJ, Hoak S. Failed rapid sequence intubation in trauma patients: esophageal tracheal combitube is a useful adjunct. J Trauma 1998; 44:534.
  80. Mercer M. The role of the Combitube in airway management. Anaesthesia 2000; 55:394.
  81. Gaitini LA, Vaida SJ, Agro F. The Esophageal-Tracheal Combitube. Anesthesiol Clin North America 2002; 20:893.
  82. Idris AH, Gabrielli A. Advances in airway management. Emerg Med Clin North Am 2002; 20:843.
  83. Keller C, Brimacombe J, Boehler M, et al. The influence of cuff volume and anatomic location on pharyngeal, esophageal, and tracheal mucosal pressures with the esophageal tracheal combitube. Anesthesiology 2002; 96:1074.
  84. Shuster M, Nolan J, Barnes TA. Airway and ventilation management. Cardiol Clin 2002; 20:23.
  85. Agrò F, Frass M, Benumof J, et al. The esophageal tracheal combitube as a non-invasive alternative to endotracheal intubation. A review. Minerva Anestesiol 2001; 67:863.
  86. Mercer MH. An assessment of protection of the airway from aspiration of oropharyngeal contents using the Combitube airway. Resuscitation 2001; 51:135.
  87. Urtubia RM, Gazmuri RR. Is the combitube traumatic? Anesthesiology 2003; 98:1021.
  88. Urtubia RM, Cárcamo CR, Montes JM. Complications following the use of the Combitube, tracheal tube and laryngeal mask airway. Anaesthesia 2000; 55:597.
  89. Oczenski W, Krenn H, Dahaba AA, et al. Complications following the use of the Combitube, tracheal tube and laryngeal mask airway. Anaesthesia 1999; 54:1161.
  90. Moser MS. Piriform sinus perforation during esophageal-tracheal combitube placement. J Emerg Med 1999; 17:129.
  91. Richards CF. Piriform sinus perforation during Esophageal-Tracheal Combitube placement. J Emerg Med 1998; 16:37.
  92. Krafft P, Nikolic A, Frass M. Esophageal rupture associated with the use of the Combitube. Anesth Analg 1998; 87:1457.
  93. Krafft P, Frass M, Reed AP. Complications with the Combitube. Can J Anaesth 1998; 45:823.
  94. Walz R, Bund M, Meier PN, Panning B. Esophageal rupture associated with the use of the Combitube. Anesth Analg 1998; 87:228.
  95. Vézina D, Lessard MR, Bussières J, et al. Complications associated with the use of the Esophageal-Tracheal Combitube. Can J Anaesth 1998; 45:76.
  96. Klein H, Williamson M, Sue-Ling HM, et al. Esophageal rupture associated with the use of the Combitube. Anesth Analg 1997; 85:937.
  97. Guyette FX, Wang H, Cole JS. King airway use by air medical providers. Prehosp Emerg Care 2007; 11:473.
  98. Russi CS, Wilcox CL, House HR. The laryngeal tube device: a simple and timely adjunct to airway management. Am J Emerg Med 2007; 25:263.
  99. Winterhalter M, Kirchhoff K, Gröschel W, et al. The laryngeal tube for difficult airway management: a prospective investigation in patients with pharyngeal and laryngeal tumours. Eur J Anaesthesiol 2005; 22:678.
  100. Lutes M, Worman DJ. An unanticipated complication of a novel approach to airway management. J Emerg Med 2010; 38:222.
  101. Sakles JC, Mosier J, Chiu S, et al. A comparison of the C-MAC video laryngoscope to the Macintosh direct laryngoscope for intubation in the emergency department. Ann Emerg Med 2012; 60:739.
  102. Kory P, Guevarra K, Mathew JP, et al. The impact of video laryngoscopy use during urgent endotracheal intubation in the critically ill. Anesth Analg 2013; 117:144.
  103. Tremblay MH, Williams S, Robitaille A, Drolet P. Poor visualization during direct laryngoscopy and high upper lip bite test score are predictors of difficult intubation with the GlideScope videolaryngoscope. Anesth Analg 2008; 106:1495.
  104. Brown CA 3rd, Bair AE, Pallin DJ, et al. Improved glottic exposure with the Video Macintosh Laryngoscope in adult emergency department tracheal intubations. Ann Emerg Med 2010; 56:83.
  105. Noppens RR, Möbus S, Heid F, et al. Evaluation of the McGrath Series 5 videolaryngoscope after failed direct laryngoscopy. Anaesthesia 2010; 65:716.
  106. Piepho T, Fortmueller K, Heid FM, et al. Performance of the C-MAC video laryngoscope in patients after a limited glottic view using Macintosh laryngoscopy. Anaesthesia 2011; 66:1101.
  107. Griesdale DE, Liu D, McKinney J, Choi PT. Glidescope® video-laryngoscopy versus direct laryngoscopy for endotracheal intubation: a systematic review and meta-analysis. Can J Anaesth 2012; 59:41.
  108. Su YC, Chen CC, Lee YK, et al. Comparison of video laryngoscopes with direct laryngoscopy for tracheal intubation: a meta-analysis of randomised trials. Eur J Anaesthesiol 2011; 28:788.
  109. De Jong A, Molinari N, Conseil M, et al. Video laryngoscopy versus direct laryngoscopy for orotracheal intubation in the intensive care unit: a systematic review and meta-analysis. Intensive Care Med 2014; 40:629.
  110. Huang WT, Huang CY, Chung YT. Clinical comparisons between GlideScope video laryngoscope and Trachlight in simulated cervical spine instability. J Clin Anesth 2007; 19:110.
  111. Robitaille A, Williams SR, Tremblay MH, et al. Cervical spine motion during tracheal intubation with manual in-line stabilization: direct laryngoscopy versus GlideScope videolaryngoscopy. Anesth Analg 2008; 106:935.
  112. Kill C, Risse J, Wallot P, et al. Videolaryngoscopy with glidescope reduces cervical spine movement in patients with unsecured cervical spine. J Emerg Med 2013; 44:750.
  113. Mosier J, Chiu S, Patanwala AE, Sakles JC. A comparison of the GlideScope video laryngoscope to the C-MAC video laryngoscope for intubation in the emergency department. Ann Emerg Med 2013; 61:414.
  114. Jones PM, Turkstra TP, Armstrong KP, et al. Effect of stylet angulation and endotracheal tube camber on time to intubation with the GlideScope. Can J Anaesth 2007; 54:21.
  115. Sakles JC, Kalin L. The effect of stylet choice on the success rate of intubation using the GlideScope video laryngoscope in the emergency department. Acad Emerg Med 2012; 19:235.
  116. Turkstra TP, Harle CC, Armstrong KP, et al. The GlideScope-specific rigid stylet and standard malleable stylet are equally effective for GlideScope use. Can J Anaesth 2007; 54:891.
  117. Hsiao WT, Lin YH, Wu HS, Chen CL. Does a new videolaryngoscope (glidescope) provide better glottic exposure? Acta Anaesthesiol Taiwan 2005; 43:147.
  118. Sun DA, Warriner CB, Parsons DG, et al. The GlideScope Video Laryngoscope: randomized clinical trial in 200 patients. Br J Anaesth 2005; 94:381.
  119. Cooper RM, Pacey JA, Bishop MJ, McCluskey SA. Early clinical experience with a new videolaryngoscope (GlideScope) in 728 patients. Can J Anaesth 2005; 52:191.
  120. Lim Y, Yeo SW. A comparison of the GlideScope with the Macintosh laryngoscope for tracheal intubation in patients with simulated difficult airway. Anaesth Intensive Care 2005; 33:243.
  121. Hirabayashi Y, Hakozaki T, Fujisawa K, et al. [GlideScope videolaryngoscope: a clinical assessment of its performance in 200 consecutive patients]. Masui 2007; 56:1059.
  122. Nouruzi-Sedeh P, Schumann M, Groeben H. Laryngoscopy via Macintosh blade versus GlideScope: success rate and time for endotracheal intubation in untrained medical personnel. Anesthesiology 2009; 110:32.
  123. Aziz MF, Healy D, Kheterpal S, et al. 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.
  124. Schumann M, Biesler I, Börgers A, et al. Tracheal intubation in patients with odentogenous abscesses and reduced mouth opening. Br J Anaesth 2014; 112:348.
  125. Xue FS, Zhang GH, Li XY, et al. Comparison of hemodynamic responses to orotracheal intubation with the GlideScope videolaryngoscope and the Macintosh direct laryngoscope. J Clin Anesth 2007; 19:245.
  126. Xue FS, Zhang GH, Li XY, et al. Comparison of haemodynamic responses to orotracheal intubation with GlideScope videolaryngoscope and fibreoptic bronchoscope. Eur J Anaesthesiol 2006; 23:522.
  127. Cooper RM. Complications associated with the use of the GlideScope videolaryngoscope. Can J Anaesth 2007; 54:54.
  128. Vincent RD Jr, Wimberly MP, Brockwell RC, Magnuson JS. Soft palate perforation during orotracheal intubation facilitated by the GlideScope videolaryngoscope. J Clin Anesth 2007; 19:619.
  129. Asai T, Enomoto Y, Shimizu K, et al. The Pentax-AWS video-laryngoscope: the first experience in one hundred patients. Anesth Analg 2008; 106:257.
  130. Asai T, Liu EH, Matsumoto S, et al. Use of the Pentax-AWS in 293 patients with difficult airways. Anesthesiology 2009; 110:898.
  131. Komatsu R, Kamata K, Hamada K, et al. Airway scope and StyletScope for tracheal intubation in a simulated difficult airway. Anesth Analg 2009; 108:273.
  132. Hoshijima H, Kuratani N, Hirabayashi Y, et al. Pentax Airway Scope(®) vs Macintosh laryngoscope for tracheal intubation in adult patients: a systematic review and meta-analysis. Anaesthesia 2014.
  133. Asai T, Enomoto Y, Shingu K, Okuda Y. [Pentax AWS airway scope]. Masui 2007; 56:862.
  134. Liu EH, Goy RW, Tan BH, Asai T. Tracheal intubation with videolaryngoscopes in patients with cervical spine immobilization: a randomized trial of the Airway Scope and the GlideScope. Br J Anaesth 2009; 103:446.
  135. Malik MA, Subramaniam R, Churasia S, et al. Tracheal intubation in patients with cervical spine immobilization: a comparison of the Airwayscope, LMA CTrach, and the Macintosh laryngoscopes. Br J Anaesth 2009; 102:654.
  136. Aoi Y, Inagawa G, Nakamura K, et al. Airway scope versus macintosh laryngoscope in patients with simulated limitation of neck movements. J Trauma 2010; 69:838.
  137. Shippey B, Ray D, McKeown D. Case series: the McGrath videolaryngoscope--an initial clinical evaluation. Can J Anaesth 2007; 54:307.
  138. Shippey B, Ray D, McKeown D. Use of the McGrath videolaryngoscope in the management of difficult and failed tracheal intubation. Br J Anaesth 2008; 100:116.
  139. Taylor AM, Peck M, Launcelott S, et al. The McGrath® Series 5 videolaryngoscope vs the Macintosh laryngoscope: a randomised, controlled trial in patients with a simulated difficult airway. Anaesthesia 2013; 68:142.
  140. Rosenstock CV, Thøgersen B, Afshari A, et al. Awake fiberoptic or awake video laryngoscopic tracheal intubation in patients with anticipated difficult airway management: a randomized clinical trial. Anesthesiology 2012; 116:1210.
  141. Kaplan MB, Ward DS, Berci G. A new video laryngoscope-an aid to intubation and teaching. J Clin Anesth 2002; 14:620.
  142. Aziz MF, Dillman D, Fu R, Brambrink AM. Comparative effectiveness of the C-MAC video laryngoscope versus direct laryngoscopy in the setting of the predicted difficult airway. Anesthesiology 2012; 116:629.
  143. Maassen R, Lee R, Hermans B, et al. A comparison of three videolaryngoscopes: the Macintosh laryngoscope blade reduces, but does not replace, routine stylet use for intubation in morbidly obese patients. Anesth Analg 2009; 109:1560.
  144. Ng I, Hill AL, Williams DL, et al. Randomized controlled trial comparing the McGrath videolaryngoscope with the C-MAC videolaryngoscope in intubating adult patients with potential difficult airways. Br J Anaesth 2012; 109:439.
  145. Lieberman, N, Hakim, AR, Lemberg, L, et, al. Trueview® Blade Improves Laryngeal View When Compared to Macintosh Blade. Anesthesiology 2003; 99:A565.
  146. Khan, Y, Jain, S, Khan, RM, et, al. Use of Macintosh, Trueview, and Airtraq Laryngoscopes for Intubation of Immobilized Manikins Head. Anesthesiology 2007; 107:A588.
  147. Lu Y, Jiang H, Zhu YS. Airtraq laryngoscope versus conventional Macintosh laryngoscope: a systematic review and meta-analysis. Anaesthesia 2011; 66:1160.
  148. Maharaj CH, O'Croinin D, Curley G, et al. A comparison of tracheal intubation using the Airtraq or the Macintosh laryngoscope in routine airway management: A randomised, controlled clinical trial. Anaesthesia 2006; 61:1093.
  149. Maharaj CH, Costello JF, McDonnell JG, et al. The Airtraq as a rescue airway device following failed direct laryngoscopy: a case series. Anaesthesia 2007; 62:598.
  150. Turkstra TP, Pelz DM, Jones PM. Cervical spine motion: a fluoroscopic comparison of the AirTraq Laryngoscope versus the Macintosh laryngoscope. Anesthesiology 2009; 111:97.
  151. Hirabayashi Y, Fujita A, Seo N, Sugimoto H. A comparison of cervical spine movement during laryngoscopy using the Airtraq or Macintosh laryngoscopes. Anaesthesia 2008; 63:635.
  152. Di Marco P, Scattoni L, Spinoglio A, et al. Learning curves of the Airtraq and the Macintosh laryngoscopes for tracheal intubation by novice laryngoscopists: a clinical study. Anesth Analg 2011; 112:122.
  153. Maharaj CH, Costello JF, Harte BH, Laffey JG. Evaluation of the Airtraq and Macintosh laryngoscopes in patients at increased risk for difficult tracheal intubation. Anaesthesia 2008; 63:182.