The difficult airway with recommendations for management - Part 2 - Difficult airway

Canadian Journal of Anesthesia

Volumn 60, Issue 11, 2013, Pages 1119-1138

  Law, J Adam ^a   Broemling, Natasha ^b   Cooper, Richard M ^b   Drolet, Pierre ^b   Duggan, Laura V ^b   Griesdale, Donald E ^b   Hung, Orlando R ^b   Jones, Philip M ^b   Kovacs, George ^b   Massey, Simon ^b   Morris, Ian R ^b   Mullen, Timothy ^b   Murphy, Michael F ^b   Preston, Roanne ^b   Naik, Viren N ^b   Scott, Jeanette ^b   Stacey, Shean ^b   Turkstra, Timothy P ^b   Wong, David T ^b  

^a DALHOUSIE UNIVERSITY   (Canada)

^b NONE

Author keywords

[No Author keywords available]

Indexed keywords

AIRWAY; AIRWAY CREATION DEVICE; ANESTHESIOLOGY; ARTICLE; ASPIRATION; CANADA; CATHETER; CONSENSUS; ELECTIVE SURGERY; EMERGENCY MEDICINE; EMERGENCY SURGERY; ENDOTRACHEAL INTUBATION; EVIDENCE BASED MEDICINE; FACE MASK; GENERAL ANESTHESIA; HUMAN; INTENSIVE CARE; LARYNGEAL MASK; LARYNGOSCOPE; LARYNGOSCOPY; LOCAL ANESTHESIA; MEDICAL DECISION MAKING; MEDICAL SOCIETY; MORBIDITY; MORTALITY; NONHUMAN; OXYGENATION; PRACTICE GUIDELINE; PREDICTION; PRIORITY JOURNAL; RANDOMIZED CONTROLLED TRIAL (TOPIC); RESPIRATION CONTROL; SUPRAGLOTTIC DEVICE; SYSTEMATIC REVIEW (TOPIC); TRACHEOTOMY; TREATMENT INDICATION; UNCONSCIOUSNESS; VIDEOLARYNGOSCOPE; WAKEFULNESS;

AIRWAY MANAGEMENT; ANESTHESIA, GENERAL; CANADA; HUMANS; INTUBATION, INTRATRACHEAL; LARYNGEAL MASKS; LARYNGOSCOPY; OXYGEN; WAKEFULNESS;

EID: 84887420838     PISSN: 0832610X     EISSN: 14968975     Source Type: Journal    
DOI: 10.1007/s12630-013-0020-x     Document Type: Article

References (152)

1. Murphy M, Hung O, Launcelott G, Law JA, Morris I. Predicting the difficult laryngoscopic intubation: are we on the right track? Can J Anesth 2005; 52: 231-5.
2. Rosenblatt WH, Wagner PJ, Ovassapian A, Kain ZN. Practice patterns in managing the difficult airway by anesthesiologists in the United States. Anesth Analg 1998; 87: 153-7.
3. Jenkins K, Wong DT, Correa R. Management choices for the difficult airway by anesthesiologists in Canada. Can J Anesth 2002; 49: 850-6.
4. Zugai BM, Eley V, Mallitt KA, Greenland KB. Practice patterns for predicted difficult airway management and access to airway equipment by anaesthetists in Queensland. Australia. Anaesth Intensive Care 2010; 38: 27-32.
5. Crosby ET, Cooper RM, Douglas MJ, et al. The unanticipated difficult airway with recommendations for management. Can J Anaesth 1998; 45: 757-76.
6. Henderson JJ, Popat MT, Latto IP, Pearce AC; Difficult Airway Society. Difficult Airway Society guidelines for management of the unanticipated difficult intubation. Anaesthesia 2004; 59: 675-94.
7. Apfelbaum JL, Hagberg CA, Caplan RA, et al. Practice guidelines for management of the difficult airway: an updated report by the American Society of Anesthesiologists Task Force on Management of the Difficult Airway. Anesthesiology 2013; 118: 251-70.
8. Petrini F, Accorsi A, Adrario E, et al. Recommendations for airway control and difficult airway management. Minerva Anestesiol 2005; 71: 617-57.
9. Boisson-Bertrand D, Bourgain JL, Camboulives J, et al. Difficult intubation. French Society of Anesthesia and Intensive Care. A collective expertise (French). Ann Fr Anesth Reanim 1996; 15: 207-14.
10. Braun U, Goldmann K, Hempel V, Krier C. Airway management. Guidelines of the German Society of Anesthesiology and Intensive Care. Anaesth Intensivmed 2004; 45: 302-06.
11. Cook T, Woodall N, Frerk C. 4th National Audit Project of the Royal College of Anaesthetists and the Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists; 2011.
12. Shiga T, Wajima Z, Inoue T, Sakamoto A. Predicting difficult intubation in apparently normal patients: a meta-analysis of bedside screening test performance. Anesthesiology 2005; 103: 429-37.
13. Law JA, Broemling N, Cooper RM, et al.; for the Canadian Airway Focus Group. The difficult airway with recommendations for management - Part 1 - Difficult tracheal intubation encountered in an unconscious/induced patient. Can J Anesth 2013; 60: this issue. DOI: 10.1007/s12630-013-0019-3.
14. Guyatt G, Gutterman D, Baumann MH, et al. Grading strength of recommendations and quality of evidence in clinical guidelines: report from an American College of Chest Physicians Task Force. Chest 2006; 129: 174-81.
15. Guyatt GH, Oxman AD, Vist GE, et al. GRADE: an emerging consensus on rating quality of evidence and strength of recommendations. BMJ 2008; 336: 924-6.
16. Croskerry P. Cognitive forcing strategies in clinical decisionmaking. Ann Emerg Med 2003; 41: 110-20.
17. Rocke DA, Murray WB, Rout CC, Gouws E. Relative risk analysis of factors associated with difficult intubation in obstetric anesthesia. Anesthesiology 1992; 77: 67-73.
18. Frerk CM. Predicting difficult intubation. Anaesthesia 1991; 46: 1005-8.
19. Hung O, Murphy M. Context-sensitive airway management. Anesth Analg 2010; 110: 982-3.
20. Khan ZH, Kashfi A, Ebrahimkhani E. A comparison of the upper lip bite test (a simple new technique) with modified Mallampati classification in predicting difficulty in endotracheal intubation: a prospective blinded study. Anesth Analg 2003; 96: 595-9.
21. Eberhart LH, Arndt C, Cierpka T, Schwanekamp J, Wulf H, Putzke C. The reliability and validity of the upper lip bite test compared with the Mallampati classification to predict difficult laryngoscopy: an external prospective evaluation. Anesth Analg 2005; 101: 284-9.
22. Eberhart LH, Arndt C, Aust HJ, Kranke P, Zoremba M, Morin A. A simplified risk score to predict difficult intubation: development and prospective evaluation in 3763 patients. Eur J Anaesthesiol 2010; 27: 935-40.
23. Savva D. Prediction of difficult tracheal intubation. Br J Anaesth 1994; 73: 149-53.
24. Mallampati SR, Gatt SP, Gugino LD, et al. A clinical sign to predict difficult tracheal intubation: a prospective study. Can Anaesth Soc J 1985; 32: 429-34.
25. Samsoon GL, Young JR. Difficult tracheal intubation: a retrospective study. Anaesthesia 1987; 42: 487-90.
26. Karkouti K, Rose K, Cohen M, Wigglesworth D. Models for difficult laryngoscopy. Can J Anaesth 2000; 47: 94-5.
27. el-Ganzouri AR, McCarthy RJ, Tuman KJ, Tanck EN, Ivankovich AD. Preoperative airway assessment: predictive value of a multivariate risk index. Anesth Analg 1996; 82: 1197-204.
28. Tse JC, Rimm EB, Hussain A. Predicting difficult endotracheal intubation in surgical patients scheduled for general anesthesia: a prospective blind study. Anesth Analg 1995; 81: 254-8.
29. Orozco-Diaz E, Alvarez-Rios JJ, Arceo-Diaz JL, Ornelas-Aguirre JM. Predictive factors of difficult airway with known assessment scales. Cir Cir 2010; 78: 393-9.
30. Arne J, Descoins P, Fusciardi J, et al. Preoperative assessment for difficult intubation in general and ENT surgery: predictive value of a clinical multivariate risk index. Br J Anaesth 1998; 80: 140-6.
31. Saghaei M, Safavi MR. Prediction of prolonged laryngoscopy. Anaesthesia 2001; 56: 1198-201.
32. Rose DK, Cohen MM. The airway: problems and predictions in 18,500 patients. Can J Anaesth 1994; 41(5 Pt 1): 372-83.
33. Reed MJ, Dunn MJ, McKeown DW. Can an airway assessment score predict difficulty at intubation in the emergency department? Emerg Med J 2005; 22: 99-102.
34. Wilson ME, Spiegelhalter D, Robertson JA, Lesser P. Predicting difficult intubation. Br J Anaesth 1988; 61: 211-6.
35. Brodsky JB, Lemmens HJ, Brock-Utne JG, Vierra M, Saidman LJ. Morbid obesity and tracheal intubation. Anesth Analg 2002; 94: 732-6.
36. 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: 1495-500.
37. 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.
38. Hung OR, Pytka S, Morris I, et al. Clinical trial of a new lightwand device (Trachlight) to intubate the trachea. Anesthesiology 1995; 83: 509-14.
39. Hung OR, Pytka S, Morris I, Murphy M, Stewart RD. Lightwand intubation: II-Clinical trial of a new lightwand for tracheal intubation in patients with difficult airways. Can J Anaesth 1995; 42: 826-30.
40. Kheterpal S, Han R, Tremper KK, et al. Incidence and predictors of difficult and impossible mask ventilation. Anesthesiology 2006; 105: 885-91.
41. Kheterpal S, Martin L, Shanks AM, Tremper KK. Prediction and outcomes of impossible mask ventilation: a review of 50,000 anesthetics. Anesthesiology 2009; 110: 891-7.
42. Langeron O, Masso E, Huraux C, et al. Prediction of difficult mask ventilation. Anesthesiology 2000; 92: 1229-36.
43. Yildiz TS, Solak M, Toker K. The incidence and risk factors of difficult mask ventilation. J Anesth 2005; 19: 7-11.
44. Gautam P, Gaul TK, Luthra N. Prediction of difficult mask ventilation. Eur J Anaesthesiol 2005; 22: 638-40.
45. Langeron O, Semjen F, Bourgain JL, Marsac A, Cros AM. Comparison of the intubating laryngeal mask airway with the fiberoptic intubation in anticipated difficult airway management. Anesthesiology 2001; 94: 968-72.
46. Giraud O, Bourgain JL, Marandas P, Billard V. Limits of laryngeal mask airway in patients after cervical or oral radiotherapy. Can J Anaesth 1997; 44: 1237-41.
47. Salvi L, Juliano G, Zucchetti M, Sisillo E. Hypertrophy of the lingual tonsil and difficulty in airway control. A clinical case (Italian). Minerva Anestesiol 1999; 65: 549-53.
48. Asai T, Hirose T, Shingu K. Failed tracheal intubation using a laryngoscope and intubating laryngeal mask. Can J Anesth 2000; 47: 325-8.
49. Ishimura H, Minami K, Sata T, Shigematsu A, Kadoya T. Impossible insertion of the laryngeal mask airway and oropharyngeal axes. Anesthesiology 1995; 83: 867-9.
50. Kumar R, Prashast, Wadhwa A, Akhtar S. The upside-down intubating laryngeal mask airway: a technique for cases of fixed flexed neck deformity. Anesth Analg 2002; 95: 1454-8.
51. Brimacombe JR. Laryngeal Mask Anesthesia: Principles and Practice. 2nd ed. Philadelphia: Saunders; 2005.
52. Li CW, Xue FS, Xu YC, et al. Cricoid pressure impedes insertion of, and ventilation through, the ProSeal laryngeal mask airway in anesthetized, paralyzed patients. Anesth Analg 2007; 104: 1195-8.
53. Ramachandran SK, Mathis MR, Tremper KK, Shanks AM, Kheterpal S. Predictors and clinical outcomes from failed Laryngeal Mask Airway Unique™: a study of 15,795 patients. Anesthesiology 2012; 116: 1217-26.
54. Aslani A, Ng SC, Hurley M, McCarthy KF, McNicholas M, McCaul CL. Accuracy of identification of the cricothyroid membrane in female subjects using palpation: an observational study. Anesth Analg 2012; 114: 987-92.
55. Elliott DS, Baker PA, Scott MR, Birch CW, Thompson JM. Accuracy of surface landmark identification for cannula cricothyroidotomy. Anaesthesia 2010; 65: 889-94.
56. Joo HS, Kapoor S, Rose DK, Naik VN. The intubating laryngeal mask airway after induction of general anesthesia versus awake fiberoptic intubation in patients with difficult airways. Anesth Analg 2001; 92: 1342-6.
57. Ferson DZ, Rosenblatt WH, Johansen MJ, Osborn I, Ovassapian A. Use of the intubating LMA-Fastrach in 254 patients with difficult-to-manage airways. Anesthesiology 2001; 95: 1175-81.
58. Timmermann A, Russo SG, Rosenblatt WH, et al. Intubating laryngeal mask airway for difficult out-of-hospital airway management: a prospective evaluation. Br J Anaesth 2007; 99: 286-91.
59. Cros AM, Maigrot F, Esteben D. Fastrach laryngeal mask and difficult intubation (French). Ann Fr Anesth Reanim 1999; 18: 1041-6.
60. Parmet JL, Colonna-Romano P, Horrow JC, Miller F, Gonzales J, Rosenberg H. The laryngeal mask airway reliably provides rescue ventilation in cases of unanticipated difficult tracheal intubation along with difficult mask ventilation. Anesth Analg 1998; 87: 661-5.
61. th National Audit Project of the Royal College of Anaesthetists and the Difficult Airway Society Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists; 2011. p. 86-95.
62. Ricard JD. High flow nasal oxygen in acute respiratory failure. Minerva Anestesiol 2012; 78: 836-41.
63. Ward JJ. High-flow oxygen administration by nasal cannula for adult and perinatal patients. Respir Care 2013; 58: 98-122.
64. Williams TA, Finn J, Perkins GD, Jacobs IG. Prehospital continuous positive airway pressure for acute respiratory failure: a systematic review and meta-analysis. Prehosp Emerg Care 2013; 17: 261-73.
65. Lenglet H, Sztrymf B, Leroy C, Brun P, Dreyfuss D, Ricard JD. Humidified high flow nasal oxygen during respiratory failure in the emergency department: feasibility and efficacy. Respir Care 2012; 57: 1873-8.
66. Zhou YF, Zhu SJ, Zhu SM, An XX. Anesthetic management of emergent critical tracheal stenosis. J Zhejiang Univ Sci B 2007; 8: 522-5.
67. Jeon HK, So YK, Yang JH, Jeong HS. Extracorporeal oxygenation support for curative surgery in a patient with papillary thyroid carcinoma invading the trachea. J Laryngol Otol 2009; 123: 807-10.
68. Tyagi I, Goyal A, Syal R, Agarwal SK, Tewari P. Emergency cardiopulmonary bypass for impassable airway. J Laryngol Otol 2006; 120: 687-90.
69. Sendasgupta C, Sengupta G, Ghosh K, Munshi A, Goswami A. Femoro-femoral cardiopulmonary bypass for the resection of an anterior mediastinal mass. Indian J Anaesth 2010; 54: 565-8.
70. Belmont MJ, Wax MK, DeSouza FN. The difficult airway: cardiopulmonary bypass-the ultimate solution. Head Neck 1998; 20: 266-9.
71. McGuire G, el-Beheiry H. Complete upper airway obstruction during awake fibreoptic intubation in patients with unstable cervical spine fractures. Can J Anesth 1999; 46: 176-8.
72. Ho AM, Chung DC, To EW, Karmakar MK. Total airway obstruction during local anesthesia in a non-sedated patient with a compromised airway. Can J Anesth 2004; 51: 838-41.
73. Martin R, Girouard Y, Cote DJ. Use of a laryngeal mask in acute airway obstruction after carotid endarterectomy (letter). Can J Anesth 2002; 49: 890.
74. Peterson GN, Domino KB, Caplan RA, Posner KL, Lee LA, Cheney FW. Management of the difficult airway: a closed claims analysis. Anesthesiology 2005; 103: 33-9.
75. Bogod D, Popat M. Tracheal intubation. In: Cook T, Woodall N, Frerk C (Eds). Fourth National Audit Project of the Royal College of Anaesthetists and The Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists; 2011: 96-104.
76. th National Audit Project of the Royal College of Anaesthetists and The Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists; 2011: 143-54.
77. Griesdale DE, Bosma TL, Kurth T, Isac G, Chittock DR. Complications of endotracheal intubation in the critically ill. Intensive Care Med 2008; 34: 1835-42.
78. Martin LD, Mhyre JM, Shanks AM, Tremper KK, Kheterpal S. 3,423 emergency tracheal intubations at a university hospital: airway outcomes and complications. Anesthesiology 2011; 114: 42-8.
79. Mort TC. Emergency tracheal intubation: complications associated with repeated laryngoscopic attempts. Anesth Analg 2004; 99: 607-13.
80. Hasegawa K, Shigemitsu K, Hagiwara Y, et al. Association between repeated intubation attempts and adverse events in emergency departments: an analysis of a multicenter prospective observational study. Ann Emerg Med 2012; 60: 749-54.e2.
81. Sakles JC, Chiu S, Mosier J, Walker C, Stolz U. The importance of first pass success when performing orotracheal intubation in the emergency department. Acad Emerg Med 2013; 20: 71-8.
82. Shaw IC, Welchew EA, Harrison BJ, Michael S. Complete airway obstruction during awake fibreoptic intubation. Anaesthesia 1997; 52: 582-5.
83. Mason RA, Fielder CP. The obstructed airway in head and neck surgery. Anaesthesia 1999; 54: 625-8.
84. Liistro G, Stanescu DC, Veriter C, Rodenstein DO, D'Odemont JP. Upper airway anesthesia induces airflow limitation in awake humans. Am Rev Respir Dis 1992; 146: 581-5.
85. Pandit JJ, Duncan T, Robbins PA. Total oxygen uptake with two maximal breathing techniques and the tidal volume breathing technique: a physiologic study of preoxygenation. Anesthesiology 2003; 99: 841-6.
86. Tanoubi I, Drolet P, Donati F. Optimizing preoxygenation in adults. Can J Anesth 2009; 56: 449-66.
87. Boyce JR, Ness T, Castroman P, Gleysteen JJ. A preliminary study of the optimal anesthesia positioning for the morbidly obese patient. Obes Surg 2003; 13: 4-9.
88. Dixon BJ, Dixon JB, Carden JR, et al. Preoxygenation is more effective in the 25 degrees head-up position than in the supine position in severely obese patients: a randomized controlled study. Anesthesiology 2005; 102: 1110-5.
89. Altermatt FR, Munoz HR, Delfino AE, Cortinez LI. Pre-oxygenation in the obese patient: effects of position on tolerance to apnoea. Br J Anaesth 2005; 95: 706-9.
90. Ramkumar V, Umesh G, Philip FA. Preoxygenation with 20 degrees head-up tilt provides longer duration of non-hypoxic apnea than conventional preoxygenation in non-obese healthy adults. J Anesth 2011; 25: 189-94.
91. Lane S, Saunders D, Schofield A, Padmanabhan R, Hildreth A, Laws D. A prospective, randomised controlled trial comparing the efficacy of pre-oxygenation in the 20 degrees head-up vs supine position. Anaesthesia 2005; 60: 1064-7.
92. Weingart SD, Levitan RM. Preoxygenation and prevention of desaturation during emergency airway management. Ann Emerg Med 2012; 59: 165-75.e1.
93. Baraka AS, Taha SK, Siddik-Sayyid SM, et al. Supplementation of pre-oxygenation in morbidly obese patients using nasopharyngeal oxygen insufflation. Anaesthesia 2007; 62: 769-73.
94. Taha SK, Siddik-Sayyid SM, El-Khatib MF, Dagher CM, Hakki MA, Baraka AS. Nasopharyngeal oxygen insufflation following pre-oxygenation using the four deep breath technique. Anaesthesia 2006; 61: 427-30.
95. Ramachandran SK, Cosnowski A, Shanks A, Turner CR. Apneic oxygenation during prolonged laryngoscopy in obese patients: a randomized, controlled trial of nasal oxygen administration. J Clin Anesth 2010; 22: 164-8.
96. Patel A, Pearce A. Progress in management of the obstructed airway. Anaesthesia 2011; 66(Suppl 2): 93-100.
97. Hillman DR, Platt PR, Eastwood PR. The upper airway during anaesthesia. Br J Anaesth 2003; 91: 31-9.
98. Hillman DR, Walsh JH, Maddison KJ, et al. Evolution of changes in upper airway collapsibility during slow induction of anesthesia with propofol. Anesthesiology 2009; 111: 63-71.
99. Walsh JH, Maddison KJ, Platt PR, Hillman DR, Eastwood PR. Influence of head extension, flexion, and rotation on collapsibility of the passive upper airway. Sleep 2008; 31: 1440-7.
100. Xue FS, Liao X, Wang Q, Yuan YJ, Xiong J, Liu JH. Is it unnecessary to confirm successful facemask ventilation before administration of a neuromuscular blocking agent? Anaesthesia 2011; 66: 519-20; author reply 520.
101. Pandit JJ. Checking the ability to mask ventilate before administering long-acting neuromuscular blocking drugs. Anaesthesia 2011; 66: 520-2; author reply 523-4.
102. Stone DJ, Gal TJ. Airway management. In: Miller RD, editor. Anesthesia. 3rd ed. New York: Churchill Livingstone; 1990. p. 1265-92.
103. Calder I, Yentis SM. Could 'safe practice' be compromising safe practice? Should anaesthetists have to demonstrate that face mask ventilation is possible before giving a neuromuscular blocker? Anaesthesia 2008; 63: 113-5.
104. Amathieu R, Combes X, Abdi W, et al. An algorithm for difficult airway management, modified for modern optical devices (Airtraq laryngoscope; LMA CTrach™): a 2-year prospective validation in patients for elective abdominal, gynecologic, and thyroid surgery. Anesthesiology 2011; 114: 25-33.
105. Goodwin MW, Pandit JJ, Hames K, Popat M, Yentis SM. The effect of neuromuscular blockade on the efficiency of mask ventilation of the lungs. Anaesthesia 2003; 58: 60-3.
106. Warters RD, Szabo TA, Spinale FG, DeSantis SM, Reves JG. The effect of neuromuscular blockade on mask ventilation. Anaesthesia 2011; 66: 163-7.
107. Walls RM. The emergency airway algorithms. In: Walls RM, Murphy MF, Luten RC, Schneider RE, editors. Manual of Emergency Airway Management. Philadelphia: Lippincott Williams & Wilkins; 2004. p. 8-21.
108. Benumof JL, Dagg R, Benumof R. Critical hemoglobin desaturation will occur before return to an unparalyzed state following 1 mg/kg intravenous succinylcholine. Anesthesiology 1997; 87: 979-82.
109. Kyle BC, Gaylard D, Riley RH. A persistent 'can't intubate, can't oxygenate' crisis despite rocuronium reversal with sugammadex. Anaesth Intensive Care 2012; 40: 344-6.
110. Curtis R, Lomax S, Patel B. Use of sugammadex in a 'can't intubate, can't ventilate' situation. Br J Anaesth 2012; 108: 612-4.
111. Ellis DY, Harris T, Zideman D. Cricoid pressure in emergency department rapid sequence tracheal intubations: a risk-benefit analysis. Ann Emerg Med 2007; 50: 653-65.
112. Brimacombe JR, Berry AM. Cricoid pressure. Can J Anaesth 1997; 44: 414-25.
113. Neilipovitz DT, Crosby ET. No evidence for decreased incidence of aspiration after rapid sequence induction. Can J Anesth 2007; 54: 748-64.
114. Smith KJ, Dobranowski J, Yip G, Dauphin A, Choi PT. Cricoid pressure displaces the esophagus: an observational study using magnetic resonance imaging. Anesthesiology 2003; 99: 60-4.
115. Palmer JH, Ball DR. The effect of cricoid pressure on the cricoid cartilage and vocal cords: an endoscopic study in anaesthetised patients. Anaesthesia 2000; 55: 263-8.
116. Clark RK, Trethewy CE. Assessment of cricoid pressure application by emergency department staff. Emerg Med Australas 2005; 17: 376-81.
117. Garrard A, Campbell AE, Turley A, Hall JE. The effect of mechanically-induced cricoid force on lower oesophageal sphincter pressure in anaesthetised patients. Anaesthesia 2004; 59: 435-9.
118. Aoyama K, Takenaka I, Sata T, Shigematsu A. Cricoid pressure impedes positioning and ventilation through the laryngeal mask airway. Can J Anaesth 1996; 43: 1035-40.
119. Asai T, Barclay K, McBeth C, Vaughan RS. Cricoid pressure applied after placement of the laryngeal mask prevents gastric insufflation but inhibits ventilation. Br J Anaesth 1996; 76: 772-6.
120. Hartsilver EL, Vanner RG. Airway obstruction with cricoid pressure. Anaesthesia 2000; 55: 208-11.
121. Howells TH, Chamney AR, Wraight WJ, Simons RS. The application of cricoid pressure. An assessment and a survey of its practice. Anaesthesia 1983; 38: 457-60.
122. Cook TM, Godfrey I, Rockett M, Vanner RG. Cricoid pressure: which hand? Anaesthesia 2000; 55: 648-53.
123. Rice MJ, Mancuso AA, Gibbs C, Morey TE, Gravenstein N, Deitte LA. Cricoid pressure results in compression of the postcricoid hypopharynx: the esophageal position is irrelevant. Anesth Analg 2009; 109: 1546-52.
124. Sellick BA. Cricoid pressure to control regurgitation of stomach contents during induction of anaesthesia. Lancet 1961; 2: 404-6.
125. Neelakanta G. Cricoid pressure is effective in preventing esophageal regurgitation. Anesthesiology 2003; 99: 242.
126. th National Audit Project of the Royal College of Anaesthetists and The Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists 2011: 155-64.
127. Ovassapian A, Salem MR. Sellick's maneuver: to do or not do. Anesth Analg 2009; 109: 1360-2.
128. Rosenblatt W, Ianus AI, Sukhupragarn W, Fickenscher A, Sasaki C. Preoperative endoscopic airway examination (PEAE) provides superior airway information and may reduce the use of unnecessary awake intubation. Anesth Analg 2011; 112: 602-7.
129. Cook TM, Morgan PJ, Hersch PE. Equal and opposite expert opinion. Airway obstruction caused by a retrosternal thyroid mass: management and prospective international expert opinion. Anaesthesia 2011; 66: 828-36.
130. th National Audit Project of the Royal College of Anaesthetists and The Difficult Airway Society. Major Complications of Airway Management in the United Kingdom. London: The Royal College of Anaesthetists; 2011: 165-73.
131. Hekiert AM, Mick R, Mirza N. Prediction of difficult laryngoscopy: does obesity play a role? Ann Otol Rhinol Laryngol 2007; 116: 799-804.
132. Lundstrom LH, Moller AM, Rosenstock C, Astrup G, Wetterslev J. High body mass index is a weak predictor for difficult and failed tracheal intubation: a cohort study of 91,332 consecutive patients scheduled for direct laryngoscopy registered in the Danish Anesthesia Database. Anesthesiology 2009; 110: 266-74.
133. Gonzalez H, Minville V, Delanoue K, Mazerolles M, Concina D, Fourcade O. The importance of increased neck circumference to intubation difficulties in obese patients. Anesth Analg 2008; 106: 1132-6.
134. Juvin P, Lavaut E, Dupont H, et al. Difficult tracheal intubation is more common in obese than in lean patients. Anesth Analg 2003; 97: 595-600.
135. Mashour GA, Kheterpal S, Vanaharam V, et al. The extended Mallampati score and a diagnosis of diabetes mellitus are predictors of difficult laryngoscopy in the morbidly obese. Anesth Analg 2008; 107: 1919-23.
136. Ezri T, Medalion B, Weisenberg M, et al. Increased body mass index per se is not a predictor of difficult laryngoscopy. Can J Anesth 2003; 50: 179-83.
137. Neligan PJ, Porter S, Max B, Malhotra G, Greenblatt EP, Ochroch EA. Obstructive sleep apnea is not a risk factor for difficult intubation in morbidly obese patients. Anesth Analg 2009; 109: 1182-6.
138. Rao SL, Kunselman AR, Schuler HG, DesHarnais S. Laryngoscopy and tracheal intubation in the head-elevated position in obese patients: a randomized, controlled, equivalence trial. Anesth Analg 2008; 107: 1912-8.
139. Collins JS, Lemmens HJ, Brodsky JB, Brock-Utne JG, Levitan RM. Laryngoscopy and morbid obesity: a comparison of the sniff and ramped positions. Obes Surg 2004; 14: 1171-5.
140. Cullen A, Ferguson A. Perioperative management of the severely obese patient: a selective pathophysiological review. Can J Anesth 2012; 59: 974-96.
141. Rose DK, Cohen MM, Wigglesworth DF, DeBoer DP. Critical respiratory events in the postanesthesia care unit. Patient, surgical, and anesthetic factors. Anesthesiology 1994; 81: 410-8.
142. Cheney FW, Posner KL, Lee LA, Caplan RA, Domino KB. Trends in anesthesia-related death and brain damage: a closed claims analysis. Anesthesiology 2006; 105: 1081-6.
143. Auroy Y, Benhamou D, Pequignot F, Bovet M, Jougla E, Lienhart A. Mortality related to anaesthesia in France: analysis of deaths related to airway complications. Anaesthesia 2009; 64: 366-70.
144. Mort TC. Continuous airway access for the difficult extubation: the efficacy of the airway exchange catheter. Anesth Analg 2007; 105: 1357-62.
145. Mort TC. Tracheal tube exchange: feasibility of continuous glottic viewing with advanced laryngoscopy assistance. Anesth Analg 2009; 108: 1228-31.
146. Difficult Airway Society Extubation Guidelines Group; Popat M, Mitchell V, Dravid R, et al. Difficult Airway Society Guidelines for the management of tracheal extubation. Anaesthesia 2012; 67: 318-40.
147. Cooper RM, Khan SM. Extubation and reintubation of the difficult airway. In: Hagberg CA, editor. Benumof and Hagberg's Airway Management. 3rd ed. Philadelphia: Elsevier-Saunders; 2012. p. 1018-46.
148. McDonnell NJ, Paech MJ, Clavisi OM, Scott KL, ANZCA Trials Group. Difficult and failed intubation in obstetric anaesthesia: an observational study of airway management and complications associated with general anaesthesia for caesarean section. Int J Obstet Anesth 2008; 17: 292-7.
149. Cooper RM. The use of an endotracheal ventilation catheter in the management of difficult extubations. Can J Anaesth 1996; 43: 90-3.
150. Cooper RM, Cohen DR. The use of an endotracheal ventilation catheter for jet ventilation during a difficult intubation. Can J Anaesth 1994; 41: 1196-9.
151. Duggan LV, Law JA, Murphy MF. Brief review: Supplementing oxygen through an airway exchange catheter: efficacy, complications, and recommendations. Can J Anesth 2011; 58: 560-8.
152. Higgs A, Swampillai C, Dravid R, et al. Re-intubation over airway exchange catheters - mind the gap (letter). Anaesthesia 2010; 65: 859-60.