Anesthesia Considerations for Dynamic Upper Airway Evaluation

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1 Anesthesia Considerations for Dynamic Upper Airway Evaluation Mohamed Mahmoud MD Associate Professor of Anesthesia & Pediatrics Cincinnati Children s Hospital Medical Center

2 Objectives Diagnosis of Sleep Disordered Breathing Anesthetic Challenges for Upper Airway Evaluation Upper Airway and Anesthesia Applications of Dexmedetomidine/Ketamine for potential Airway Catastrophe

3 Evaluation of Children with Obstructive Sleep Apnea Obstructive apnea Obstructive hypopnea

4 Identification of Sites of Upper Airway Obstruction Flexible endoscopy - In the office setting or operating room Lateral neck x - ray Fluoroscopy of airway Cine CT Cine MRI

5 New Diagnostic Modality

6

7 MRI Sleep Study Airway evaluation: Static Images Dynamic Images 128 consecutive images over 2 minutes Mahmoud M et al Ciné MRI airway studies : Optimal Images and Anesthetic Challenges Pediatric Radiology (2009) 39:

8 MRI Sleep Study

9 Causes of persistent obstructive sleep apnea despite previous T&A in children with Down syndrome as depicted on static and dynamic cine MRI Donnelly, Shott, LaRose, Chini, Amin. Am J Roentgenol patients Mean age 9.9 years Macroglossia 74% Glossoptosis 63% Recurrent adenoids 63% Enlarged lingual tonsils 30% Hypopharyngeal collapse 22%

10 Glossoptosis

11 Hypopharyngeal collapse

12 Glossoptosis Hypopharyngeal Collapse

13 OSA Surgical options for base of tongue obstruction Lingual tonsillectomy Radiofrequency reduction to base of tongue Genio-glossus advancement Resection of wedge of base of tongue Coblation: Midline posterior glossectomy Mandibular advancement

14 Drug Induced Sleep Endoscopy (DISE)

15 Drug Induced Sleep Endoscopy (DISE)

16 Drug Induced Sleep Endoscopy (DISE)

17 Case: 3 year old 16.4 kg History of OSA, S/P T&A and cleft lip and palate repair Polysomnography showed : 96 episodes of obstructive apnea ( lowest O2 saturation 71%, average duration 12.8 seconds and longest 45.5 seconds)

18 Why Do We Struggle?

19 Oral Airway Intervention

20 Nasal Airway Intervention

21 CPAP Fleck et al. Effect of Positive Airway Pressure on the Upper Airway Documented with Magnetic Resonance Imaging JAMA Otolaryngology, 2013 Jun 1;139(6):636-8

22 Anesthesia and Dynamic Upper Airway Evaluation Dexmedetomidine Propofol Dexmedetomidine and Ketamine

23

24 Dexmedetomidine VS Propofol for MRI Sleep Studies Requirement for Artificial Airway by Severity of OSA as Documented by Polysomnography OSA Severity Mild Moderate Severe Dexmedetomidine Propofol P-value N = 16 N = 8 Obstructive Index (events/hour) 2.7 ± ± Respiratory Disturbance Index (events/hour) 3.6 ± ± Needed Artificial Airway, N (%) 2 (13) 1(13) 1 N = 11 N = 9 Obstructive Index (events/hour) 10.2 ± ± Respiratory Disturbance Index (events/hour) 11.0 ± ± Needed Artificial Airway, N (%) 2 (18) 3 (33) 0.62 N = 14 N = 9 Obstructive Index (events/hour) 21.8 ± ± Respiratory Disturbance Index (events/hour) 23.8 ± ± Needed Artificial Airway, N (%) 1 (7) 5 (56) 0.02 Mahmoud et al. Anesthesia Analgesia :

25 Are there qualitative differences in the hypnotic response produced by DEX Provides sedation without significant respiratory depression1-4 Sedative properties that parallel natural sleep Blanchard AR. Postgrad Med. 2002;111: Kamibayashi T, et al Anesthesiology. 2000;95: Maze M. et al. Anesthetic Pharmacology: Physiologic Principals and Clinical Practice. Churchill Livingstone; Maze M, et al. Crit Care Clin. 2001;4:881.

26 Hypnotic Effect of DEX

27 Pharyngeal Dilator Muscle Activation

28 Low DEX 1 mcg/kg/h Research Images Diagnostic Brain High DEX 3 mcg/kg/h Research Images

29 Static Measurements Axial SSFSE Retroglossal Area AP diameter Trans diameter

30 Dynamic Measurements FGE Cine NP Area NP diameter RG Area RG diameter Min/Max

31

32 Critical Closing Pressure during Dex-induced Sleep

33

34 Mean sleep Pcrit = cmh2o Mean dexmedetomidine Pcrit = cmh2o (p = 0.375)

35 Does propofol affect sleep architecture? PSG evaluation in OSA patients Rabelo FA, Otolaryngol 2010 Propofol significantly changed sleep architecture

36 Upper airway collapsibility was determined at three concentrations of propofol Anesthesia ( 2.5, 4.0, and 6.0 mcg/ml ) Profound inhibition of genioglossus muscle activity

37

38

39

40 Ketamine and Dexmedetomidine for MRI Sleep Studies Sedation initiated with a bolus dose of ketamine (1 mg/kg) and dexmedetomidine (1 mcg/kg) Continuous infusion of dexmedetomidine ( l mcg/kg/h) Luscri et al. Pediatric Anesthesia :

41 Dexmedetomidine and Ketamine Dexmedetomidine prevents: Tachycardia Hypertension Salivation Emergence phenomena Ketamine prevents: Bradycardia hypotension

42 Airway Catastrophe

43 Airway Catastrophe

44 Airway Catastrophe Mahmoud et al. Pediatric Anesthesia :

45 Congenital Lobar Emphysema

46 Dexmedetomidine for Thyroplasty

47 Conclusion Understanding the goal of the procedure is essential to obtain a high-quality evaluation Dexmedetomidine is the sedative agent of choice for dynamic upper airway evaluation

48 Thank You

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