Anesthetic management of maxillofacial surgery

1. Anesthetic management of maxillofacial surgery By: Alaa Samir El Kateb Lecturer of anesthesia and intensive care Ain Shams university

2. Objectives: • - Preoperative airway assessment. • - Learn how to perform awake intubation. • - How to draw a fluid chart. • - What is massive blood transfusion and its • complications. • - Know complications and prevention of • hypothermia.

3. Le fort classification Transverse crossing floor of nose, separating of the palate from the maxilla. Fracture of maxilla, where body of the maxilla is separated from the facial skeleton (pyramidal in shape) The entire maxilla and one or more facial bones are completely separated from the craniofacial skelton

4. Anesthetic consideration • Airway management (intubation & • extubation) • Blood loss • Hypothermia • Eye protection

5. Airway management!

6. Airway Anatomy

7. Airway assessment • 1- HISTORY: • *Rheumatoid - *Morbid obese • *Submandibular abscess *Retropharyngeal abscess • *Neoplasm, Radiation, *Scleroderma • *Previous tracheostomy *Prolonged intubation • *Bleeding lesions *Syndroms e.g. Down • *Mandibular, maxillary &/or cervical spine fractures • *History of difficult intubation

8. Cont. Preoperative airway evaluation • 2- PHYSICAL EXAMINATION: • Thick , short & muscular neck • Receding or hypoplastic mandible • Edentulous, prominent incisors • High arched palate, large tongue • Presence of ear or hand deformities

9. Cont. Preoperative airway evaluation • Hyomental distance: 2 fingers • Thyromental distance: 6.5 cm • Mouth opening: (TMJ) 3-4 cm • Neck Movement: 35 degree flexion at • lower cervical and 80 degree • extension at atlanto-occipital

10. Cont. Preoperative airway evaluation • Mallampati’s : sitting, vocalizing, tongue protruded

11. - Cormack and Lehane scale The vocal cords visible The vocal cords partially visible (posterior commissure) Epiglottis Not seen Only epiglottis

12. El-Ganzouri risk index

13. Awake intubationpreparation

14. Innervation of nasal, oropharyngeal & laryngeal cavities • Nasal/Nasopharyngeal Cavity –Trigeminal Nerve (CN V) • Oropharynx- • Glossopharyngeal Nerve (CN IX) • Larynx & Trachea – • Branches of the Vagus Nerve (CN X)

15. Anesthesia of the Nasal Mucosa and Nasopharynx(Sphenopalatine ganglion and ethmoid nerve) • - Lidocaine + epinephrine or • lidocaine + phenylephrine • - Long cotton-tipped applicators: • 1st: 45 degree to the hard palate • 2nd: parallel to the dorsal surface of the nose • - Left in place for 5 minutes • - Should be done bilaterally

16. II. Anesthesia of the mouth, oropharynxand base of tongue (Glossopharyngeal & superior laryngeal nerves) • - Lidocaine gel on tongue blade and • patient "sucks“. Peak on set 15 min. • OR Lidocaine can be placed in a • nebulizer for 5-7 min • OR The tongue and posterior pharynx • are sprayed with the atomizer.

17. Glossopharyngeal nerve block

18. Superior laryngeal nerve block

19. III. Anesthesia of the hypopharynx, larynx and trachea Transtracheal block (RLN)

20. After anesthetizing the airway you may use: • Direct laryngoscopy • Blind intubation • Retrograde intubation • Fiberoptic intubation • PLEASE • Maintain spontaneous breathing

21. combitube ctrach COPA ILMA

22. LMA_supreme2 glidescope video assessted AIRtraq

23. TruView

24. Nasal intubation • - Vasoconstrictor 30-45 minutes earlier. • - Insert ETT parallel to hard palate. • - Bevel is medial (turbinates are lateral) • - During blind nasal: • _ Introduce the ETT during inspiration • _ You may use capnography

25. Fiberoptic bronchoscopy • - May turn to be an emergency situation. • - If to be used, use it as the first choice. • - Pull the tongue forward, jaw thrust. • - Put the patient in sitting position. • - Keep the midline against hard palate. • - You may dim room light and use it as • illuminating stylet.

26. Retrograde intubation

27. - For nasal intubation!!

28. Submental intubation

29. Safe extubation • “air leak test” is done to evaluate whether or not the patient is capable of breathing spontaneously • You may use a hollow introducer or a tube-exchanger, bronchoscope or NGT

32. Blood loss

33. - Wide pore canula / central venous access Fluid therapy Deficit Maintenance Losses • Ryle • UOP • Bleeding • 3rd space • loss Hourly maintenance * fasting hours • 4 cc/Kg for 1st 10 weight • 2 cc/Kg for 2nd 10 weight • 1 cc/Kg for remaining • weight

34. Gross’s simplified formula • Allowable blood loss = • [(Starting Hct – target Hct) / Starting Hct] • X Estimated blood volume. • Estimated blood volume • Adults: 65-75 cc/kg • Infants: 80 cc/kg • Neonates: 85 cc/kg • Newborn: 100-120 cc/Kg • Amount to be transfuse (ml)= • [Target haemaglobin – Current haemaglobin] • X 4 X weight (kg)

35. Massive blood transfusion • American Association of Blood Banks definition: • 10 units of blood in 24 hrs • or 5 units of blood in 4 hrs

36. Complications of massive blood transfusion • 1- Coagulopathy: At least 1.5 times blood • volume to become a clinical problem. • 2- Hypothermia. • 3- Citrate toxicity: > unit/5 min • 4- Hyperkalemia

37. Hypothermia

38. Complications of hypothermia: • 1- Arrhythmia: PVC (<30°C) – VF (<28°C) • 2- ↓ O2 delivery to tissues: O2 dissociation • curve, VC, ↑ blood viscosity. • 3- ↓ GFR and UOP stops at 20°C • 4- ↑ blood viscosity, ↑ rouleaux formation, • coagulopathy (depressed clotting • mechanism and platelets function). • 5- Metabolic acidosis. • 6- Post-operative shivering.

39. How to prevent? • - ↑ ambient air temperature. • - Humidify inspired air • - Warm mattress • - Plastic or cotton wraps • - Warm fluids

40. Eye protection

41. Any questions?? • Thank you