Terkawi AS, Karakitsos D, Elbarbary M. Ultrasound for the anesthesiologists: present and future. Sci World J. 2013;2013:683-5.

Osman A, Sum KM. Role of upper airway ultrasound in airway management. J Intensive Care. 2016;4:52.

Kristensen MS, Teoh WHL. The ultrasound probe in the hands of anesthesiologists: a powerful new tool for airway management. Anesthesiol News. 2013:23-30.

Soltani Mohammadi S, Saliminia A, Nejatifard N. Usefulness of ultrasound view of larynx in pre-anesthetic airway assessment: a comparison with Cormack-Lehane classification during direct laryngoscopy. Anesth Pain Med. 2016;6:e39566.

Adhikari S, Zeger W, Schmier C. Pilot study to determine the utility of point-of-care ultrasound in the assessment of difficult laryngoscopy. Acad Emerg Med. 2011;18:754-8.

Ezri T, Gewurtz G, Sessler DI. Prediction of difficult laryngoscopy in obese patients by ultrasound quantification of anterior neck soft tissue. Anaesthesia. 2003;58:1111-4.

Komatsu R, Sengupta P, Wadhwa A. Ultrasound quantification of anterior soft tissue thickness fails to predict difficult laryngoscopy in obese patients. Anaesth Intensive Care. 2007;35:32-7.

Tsui BC, Hui C. Challenges in sublingual airway ultrasound interpretation. Can J Anesth. 2009;56:393-4.

Hui C, Tsui BC. Sublingual ultrasound examination of the airway: a pilot study. Canadian Anesthesiologists's Society Annual Meeting 2009. 2009.

Gupta D, Srirajakalidindi A, Ittiara B. Ultrasonographic modification of Cormack Lehane classification for pre-anesthetic airway assessment. Middle East J Anesthesiol. 2012;21:835-42.

Litman RS, Weissend EE, Shibata D. Developmental changes of laryngeal dimensions in unparalyzed, sedated children. Anesthesiology. 2003;98:41-5.

Lakhal K, Delplace X, Cottier JP. The feasibility of ultrasound to assess subglottic diameter. Anaesth Analg. 2007;104:611-4.

Shibasaki M, Nakajima Y, Ishii S. Prediction of pediatric endotracheal tube size by ultrasonography. Anesthesiology. 2010;113:819-24.

Sustić A, Miletić D, Protić A. Can ultrasound be useful for predicting the size of a left double-lumen bronchial tube? Tracheal width as measured by ultrasonography versus computed tomography. J Clin Anesth. 2008;20:247-52.

Xia CX, Zhu Q, Cheng Y. Sonographic assessment of hypopharyngeal carcinoma: preliminary study. J Ultrasound Med. 2011;30:217-25.

Komatsu M, Komatsu T, Inove K. Ultrasonography of Zenker's diverticulum: special reference to differential diagnosis from thyroid nodules. Eur J Ultrasound. 2000;11:123-5.

Lichtenstein D, Biderman P, Meziere G. The "sinusogram", a real-time ultrasound sign of maxillary sinusitis. Intensive Care Med. 1998;24:1057-61.

Kundra P, Mishra SK, Ramesh A. Ultrasound of the airway. Indian J Anaesth. 2011;55:456-62.

Hung TY, Li S, Chen PS. Bedside ultrasonography as a safe and effective tool to diagnose acute epiglottitis. Am J Emerg Med. 2011;29:351-3.

Ko DR, Chung YE, Park I. Use of bedside sonography for diagnosing acute epiglottitis in the emergency department: a preliminary study. J Ultrasound Med. 2012;31:19-22.

Siegel HE. The use of simultaneous ultrasound and polysomnography for diagnosis of obstructive sleep apnea. Neurology. 1999;52:A110-1.

Lahav Y, Rosenzweig E, Heyman Z. Tongue base ultrasound: a diagnostic tool for predicting obstructive sleep apnea. Ann Otol Rhinol Laryngol. 2009;118:179-84.

Liu KH, Chu WCW, To KW. Sonographic measurement of lateral parapharyngeal wall thickness in patients with obstructive sleep apnea. Sleep. 2007;30:1503-8.

Apfelbaum JL, Hagberg CA, Caplan RA. 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.

Elliott DS, Baker PA, Scott MR. Accuracy of surface landmark identification for cannula cricothyroidotomy. Anaesthesia. 2010;65:889-94.

Marciniak B, Fayoux P, Hebrard A. Airway management in children: ultrasonography assessment of tracheal intubation in real time?. Anesth Analg. 2009;108:461-5.

Fiadjoe JE, Stricker P, Gurnaney H. Ultrasound-guided tracheal intubation. A novel intubation technique. Anesthesiology. 2012;117:1389-91.

Abhishek C, Munta K, Rao SM. End-tidal capnography and upper airway ultrasonography in the rapid confirmation of endotracheal tube placement in patients requiring intubation for general anaesthesia. Indian J Anaesth. 2017;61:486-9.

Hsieh KS, Lee CL, Lin CC. Secondary confirmation of endotracheal tube position by ultrasound image. Crit Care Med. 2004;32:S374-7.

Sim SS, Lien WC, Chou HC. Ultrasonographic lung sliding sign in confirming proper endotracheal intubation during emergency intubation. Resuscitation. 2012;83:307-12.

Gerscovich EO, Cronan M, McGahan JP. Ultrasonographic evaluation of diaphragmatic motion. J Ultrasound Med. 2001;20:597-604.

Lichtenstein D, Lascols N, Prin S. The lung pulse: an early ultrasound sign of complete atelectasis. Intensive Care Med. 2003;29:2187-92.

Hosseini JS, Talebian MT, Ghafari MH. Secondary confirmation of endotracheal tube position by diaphragm motion in right subcostal ultrasound view. Int J Crit Illn Inj Sci. 2013;3:113-7.

Ma G, Davis DP, Schmitt J. The sensitivity and specificity of transcricothyroid ultrasonography to confirm endotracheal tube placement in a cadaver model. J Emerg Med. 2007;32:405-7.

Hatfield A, Bodenham A. An emerging role in anaesthesia and intensive care. Br J Anaesth. 1999;83:789-800.

Goksu E, Sayraç V, Oktay C. How stylet use can affect confirmation of endotracheal tube position using ultrasound. Am J Emerg Med. 2010;28:32-4.

Kerforne T, Petitpas F, Scepi M. Accurate and easy to learn ultrasound sign to confirm correct tracheal intubation in cadaver model. Br J Anaesth. 2013;11:510-1.

Raphael DT, Conard FU. Ultrasound confirmation of endotracheal tube placement. J Clin Ultrasound. 1987;15:459-62.

Chou HC, Tseng WP, Wang CH. Tracheal Rapid Ultrasound Exam (T.R.U.E.) for confirming endotracheal tube placement during emergency intubation. Resuscitation. 2011;82:1279-84.

Adi O, Chuan TW, Rishya M. A feasibility study on bedside upper airway ultrasonography compared to waveform capnography for verifying endotracheal tube location after intubation. Crit Ultrasound J. 2013;5:7.

Simon M, Metschke M, Braune SA. Death after percutaneous dilatational tracheostomy: a systematic review and analysis of risk factors. Crit Care. 2013;17:R258.

Bertram S, Emshoff R, Norer B. Ultrasonographic anatomy of the anterior neck: implications for tracheostomy. J Oral Maxillofac Surg. 1995;53:1420-4.

Sustic A, Kovac D, Zgaljardic Z. Ultrasound-guided percutaneous dilatational tracheostomy: a safe method to avoid cranial misplacement of the tracheostomy tube. Intensive Care Med. 2000;26:1379-81.

Hatfield A, Bodenham A. Portable ultrasonic scanning of the anterior neck before percutaneous dilatational tracheostomy. Anaesthesia. 1999;54:660-3.

Muhammad JK, Major E, Wood A. Percutaneous dilatational tracheostomy: haemorrhagic complications and the vascular anatomy of the anterior neck. A review based on 497 cases. Int J Oral Maxillofac Surg. 2000;29:217-22.

Hardee PS, Ng SY, Cashman M. Ultrasound imaging in the preoperative estimation of the size of tracheostomy tube required in specialized operations in children. Br J Oral Maxillofac Surg. 2003;41:312-6.

Orr JA, Stephens RS, Mitchell VM. Ultrasound guided localization of the trachea. Anaesthesia. 2007;62:966-74.

Dinsmore J, Hear AMB, Green RJ. The use of ultrasound to guide time-critical cannula tracheotomy when anterior neck airway anatomy is unidentifiable. Eur J Anaesthesiol. 2011;28:506-10.

Vieira D, Lages N, Dias J. Ultrasound-guided retrograde intubation. Anaesthesia. 2013;68:1075-6.

Epstein SK. Extubation. Respir Care. 2002;47:483-4.

Teixeira C, Maccari JG, Vieira SR. Impact of a mechanical ventilation weaning protocol on the extubation failure rate in difficult-to-wean patients. J Bras Pneumol. 2012;38:364-71.

Ding LW, Wang HC, Wu HD. Laryngeal ultrasound: a useful method in predicting post-extubation stridor. A pilot study. Eur Respir J. 2006;27:384-9.

Jiang JR, Tsai TH, Jerng JS. Ultrasonographic evaluation of liver/spleen movements and extubation outcome. Chest. 2004;126:179-85.

Blumhof S, Wheeler D, Thomas K. Change in diaphragmatic thickness during the respiratory cycle predicts extubation success at various levels of pressure support ventilation. Lung. 2016;194:519-25.

Farghaly S, Hasan AA. Diaphragm ultrasound as a new method to predict extubation outcome in mechanically ventilated patients. Aust Crit Care. 2017;30:37-43.