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Airway evaluation and Management

Airway evaluation and Management. By :Dr. Adel Elshimy. Lecture Objectives. Students at the end of the lecture will be able to : Describe the applied anatomy of the airway. Conduct a preoperative airway assessment . Identify a potentially difficult airway.

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Airway evaluation and Management

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  1. Airway evaluation andManagement By :Dr. Adel Elshimy

  2. Lecture Objectives Students at the end of the lecture will be able to : • Describe the applied anatomy of the airway. • Conduct a preoperative airway assessment . • Identify a potentially difficult airway. • Learn about management of airway obstruction. • Become familiar with airway equipment. • Understand issues around aspiration prophylaxis. • Become familiar with controlled ventilation. • Appreciate ways of monitoring of ventilation and oxygenation.

  3. AIRWAY CONTROL Opening the Airway Jaw thrust Head tilt–chin lift

  4. AIRWAY CONTROL Oropharyngeal Airway

  5. Mask Ventilation • Oral airway • Two-handed technique

  6. AIRWAY CONTROL Oropharyngeal Airway (cont.)

  7. AIRWAY CONTROL Nasopharyngeal Airway (cont.)

  8. OXYGENATION AND VENTILATION Bag-Valve-Mask (cont.) With oxygen reservoir

  9. Esophageal-Tracheal Combitube A = esophageal obturator; ventilation into trachea through side openings = B C = tracheal tube; ventilation through open end if proximal end inserted in trachea D = pharyngeal cuff; inflated through catheter = E F = esophageal cuff; inflated through catheter = G H = teeth marker; blindly insert Combitube until marker is at level of teeth E Distal End A C H Proximal End B D F G

  10. L M A

  11. Usage L M A

  12. Indications of intubation • Resuscitation (CPR) • Prevention of lung soiling • Positive pressure ventilation (GA) • Pulmonary toilet • Patent airway (coma or near coma) • Respiratory failure(CO2 retention )

  13. Airway Anatomy • Innervation • Vagus n. • Superior laryngeal n. • External branch – motor to cricothyroid m. • Internal branch – sensory larynx above TVC’s • Recurrent laryngeal n. • Right – subclavian • Left – Aortic arch (board question) • Motor to all other muscles, Sensory to TVC’s and trachea

  14. Management I-History: previous history of difficulty is the best predictor Inquire about:-Nature of difficulty -No of trials -Ability to ventilate bet trials -Maneuver used -Complications II-Snoring and sleep apnea( prdictors of DMV)

  15. LEMON -Look for any obvious anomaly • Morbid obesity(BMI) • Skull • Face • Jaw • Mouth,teeth • Neck

  16. Examination I-The 3 joints movements • A-O joint(15-20 degrees) Presence of a gap bet the Occiput and C1 is essential • The cervical spine(range>90) • T.M joint: • -subluxation (1 finger)

  17. Examine Airway The 3 – 3 – 2 rule • Mouth open: 3 fingers • Mentum to hyoid: 3 fingers • Floor of mouth to thyroid cartilage: 2 fingers LEMON

  18. Examine Airway • Mouth open: 3 fingers • Allows insertion of tube, laryngoscope • Mentum to hyoid: 3 fingers • Predicts ability to lift tongue into mandible LEMON

  19. Mallampatti Mallampatti test: Based on the hypothesis That when the base of the Tongue is disproportionally Large it will overshadow the larynx

  20. -Simple easy test,correlates with what is seen during laryngoscopy or Cormack-Lehene grades ,but 1-moderate sensitivity and specificity(12% false +ve) 2-Inter observer variation 3-Phonation increases false negative view

  21. II-Wilson test -Consists of 5 easily assessed factors • Body wight(n=0 ,>90=1,>110=2) • Head and neck movement • Jaw movement • Receding jaw • Buck teeth Each factor assigned as o ,1 ,2 max is 10

  22. Obstruction • Apparent cause e.g. goitre • OSA • Noisy breathing or stridor • Signs of upper airway obstruction • Other causes

  23. Neck Mobility Prior condition • Surgery • Rheumatoid arthritis • Osteoarthritis • Others LEMON

  24. Proper Equipment -Bag and mask,oxygen source -Airways oro and nasopharyngeal -Laryngosopes different blades -ETT different sizes -suction on

  25. Airway gadgets

  26. Mask Ventilation • Induction of anesthesia produces upper airway relaxation and possible collapse • Downward displacement of mask with thumb and index finger

  27. Requirement of successful intbatin • 1-Normal roomy mandible • 2-Normal T-M, A-O , and C-spine

  28. Positioning for successful intubation 3-Alignment of 3 axes or Assuming sniffing position -Any anomaly in these 3 joints A-O, T-M or C-spine can result In difficult intubation

  29. Endotracheal Intubation • Look for epiglottis • If initially not found insert laryngoscope further • If this maneuver does not work slowly pull laryngoscope back • Once epiglottis visualized, push laryngoscope into vallecula and apply traction at 45 degree angle to “push” epiglottis up and out of the way

  30. Confirm tube position • Direct visualization of ETT between cords • Bronchoscopy ;carina seen • Continuous trace of capnography • 3 point auscultation • Esophageal detector device • Other as bilateral chest movement,mist in the tube,CXR

  31. Rapid sequence induction • Indications • Technique: -Preoxygenation -IV induction with sux -Cricoid pressure -Intubate, inflate the cuff ,confirm position -Release cricoid and fix the tube

  32. Cricoid pressure Cricoid Pressure

  33. Complications of intubation 1-Inadequate ventilation 2-Esophageal intubation 3-Airway obstruction 4-Bronchospasm 5-Aspiration 6- Trauma 7-Stress response

  34. Difficult airway • Causes -Congenital -Acquired

  35. Airway gadgets

  36. Bullard Wu Scope Rigid Fiberoptic Scope Fiberoptic

  37. Upsher GlideScope Rigid Fiberoptic Scope Fiberoptic

  38. L M A

  39. Difficult airway • Expected from history,examination Secure airway while awake under LA • Unexpected different options Priority for maintenance of patent airway and oxygenation

  40. Transtracheal Jet Ventilation TTJV

  41. Ventilation • Spontaneous ventilation • Controlled ventilation • Minute volume divider -Tidal volume 10 mls/kg -Respiratory rate to maintain normocarbia -I:E ratio

  42. Recommendations • Adequate airway assessment to pick up expected D.A to be secured awake • Difficult intubation cart always ready • Pre oxygenation as a routine • Maintenance of oxygenation not the intubation should be your aim • Use the technique you are familiar with • Always have plan B,C,D in unexpected D.A

  43. References • Anesthesia and resuscitation Dr. H .Braden chapters 1,2 Airway and ventilation • Lecture notes on clinical anesthesia Carl Gwinnutt 2nd edition Chapter 2 page 18-29

  44. Dr. Adel Elshimy Date: 18/10/2011 Thank You 

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