Obstructive sleep apnoea in children: perioperative considerations

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Obstructive sleep apnoea in children: perioperative considerations M. Patino, S. Sadhasivam, M. Mahmoud  British Journal of Anaesthesia  Volume 111, Pages i83-i95 (December 2013) DOI: 10.1093/bja/aet371 Copyright © 2013 The Author(s) Terms and Conditions

Fig 1 Sagittal midline fast gradient MRI images obtained during expiration (a) and inspiration (b) show intermittent collapse of the retroglossal airway (arrows). At expiration (a), the retroglossal airway (arrows) is patent. During inspiration (b), there is glossoptosis, with the tongue moving posteriorly and obstructing the retroglossal airway (arrows). British Journal of Anaesthesia 2013 111, i83-i95DOI: (10.1093/bja/aet371) Copyright © 2013 The Author(s) Terms and Conditions

Fig 2 Post-adenotonsillectomy disposition of children with OSA. PSG, polysomnography; AHI, apnoea/hypopnoea index. British Journal of Anaesthesia 2013 111, i83-i95DOI: (10.1093/bja/aet371) Copyright © 2013 The Author(s) Terms and Conditions

Fig 3 Acoustic sensor monitoring with a sensor placed in a child’s neck (acoustic respiratory monitoring; Masimo Corporation®, Irvine, CA, USA). British Journal of Anaesthesia 2013 111, i83-i95DOI: (10.1093/bja/aet371) Copyright © 2013 The Author(s) Terms and Conditions

Fig 4 Effects of obstructive sleep apnoea (OSA) and CYP2D6 metabolism on codeine. This figure illustrates the effects of OSA and genotypes of CYP2D6 on codeine’s analgesic and adverse effects. CYP2D6, Cytochrome P-450 family enzyme type 2D6; PM, poor metabolizers; IM, intermediate metabolizers; EM, extensive metabolizers; UM, ultrarapid metabolizers. The bell-shaped curve illustrates approximately distributions of CYP2D6 phenotypes, PM, IM, EM and UM in the US population. This distribution may vary depending on the ethnicity (Ethiopians have higher proportions of UMs than the US population). CYP2D6 PMs have inadequate or no pain control from lack or very minimal conversion of codeine (pro-drug) to morphine (blue arrow). UMs are likely to have more codeine adverse effects as they more readily form higher morphine concentrations from a given dose of codeine (solid red arrow). In children with OSA, higher CYP2D6 activity including EM and UM have higher incidence of codeine-related adverse effects because of increased sensitivity of children with OSA to central depressive effects of morphine (red arrow with an increasing gradient). This might be applicable to other opioids metabolized significantly by the CYP2D6 pathway such as tramadol and hydrocodone. Optimal analgesia is a balance of codeine’s analgesia and adverse effects, which is more likely achieved in IM and some EM with relatively normal CYP2D6 activity. British Journal of Anaesthesia 2013 111, i83-i95DOI: (10.1093/bja/aet371) Copyright © 2013 The Author(s) Terms and Conditions

Fig 5 Post-tonsillectomy pain management in children with obstructive sleep apnoea (OSA). Children with OSA have chronic systemic inflammation with increased pain perception, making their postoperative pain control challenging. Children with OSA are at higher risk of upper airway obstruction and opioid-induced respiratory depression (OIRD) because of their higher sensitivity to central depressive effects of opioids, especially in children with Cytochrome P-450 family enzyme type 2D6 (CYP2D6) ultrarapid metabolizer status taking codeine. Scheduled doses of acetaminophen, non-steroid anti-inflammatory drugs (NSAIDs; such as oral ibuprofen 24 h after tonsillectomy) and dexamethasone can help control pain, inflammation, and swelling from tonsillectomy while minimizing the need for opioids. EM, extensive metabolizers; UM, ultrarapid metabolizers. British Journal of Anaesthesia 2013 111, i83-i95DOI: (10.1093/bja/aet371) Copyright © 2013 The Author(s) Terms and Conditions