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Developing a Perioperative Obstructive Sleep Apnea Safety Program

Developing a Perioperative Obstructive Sleep Apnea Safety Program. Wm. Charles Sherrill, Jr. M.D. Medical Director, Novant Health Sleep Tennessee Sleep Society October 4, 2013. Screening Tools for OSA. Sleep Disordered Breathing Simple snoring Upper airway resistance syndrome (UARS)

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Developing a Perioperative Obstructive Sleep Apnea Safety Program

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  1. Developing a Perioperative Obstructive Sleep Apnea Safety Program Wm. Charles Sherrill, Jr. M.D. Medical Director, Novant Health Sleep Tennessee Sleep Society October 4, 2013

  2. Screening Tools for OSA • Sleep Disordered Breathing • Simple snoring • Upper airway resistance syndrome (UARS) • Obstructive sleep apnea • Central sleep apnea with or without Cheyne-Stokes Respirations • Complex sleep apnea • Unobstructive hypoventilation

  3. Clinical Scenario 45 year old male, 320 lbs and 5’11” had a rotator cuff repair under general anesthesia. The intraoperative course was uneventful. He was admitted to the ward for overnight pain control. Four hours after surgery, he received an intramuscular injection of Meperidine 100 mg with Phenergan 25 mg. This was repeated 3 hours later when severe pain prevented him from sleeping. Two hours later, nurses making a routine check found him to be in full arrest. He could not be resuscitated. The internist’s history and physical mentioned his having been diagnosed with sleep apnea. Ann Lofsky. M.D. Sleep Apnea and Narcotic Postoperative Pain Medication: A Morbidity and Mortality Risk

  4. OSA and the Surgical Patient • Malpractice cases involving Obstructive Sleep Apnea in Hospitalized Patients • Intubation complications (20%) • Extubation difficulties (10%) • Post operative catastrophes (70%) • Drug induced respiratory arrest resulting in death/brain damage • Patients with OSA with inadequate monitoring

  5. OSA and the Surgical Patient • Postoperative catastrophes (“Dead in bed”) • Severe OSA • Morbid obesity • Isolated ward room • No monitoring • Receiving narcotics • Off O2/PAP Jonathan L. Benumof, M.D.

  6. The Balance of Forces (Malhotra & White, 2002)

  7. Obstructive Sleep Apnea OSA and the Surgical Patient • As a consequence of the previous factors patients with OSA are increasing dependent on the activity of the pharyngeal dilator muscles for airway patency. • OSA patients demonstrate increased EMG activity in the pharyngeal dilator muscles (Genioglossus muscle) during wakefulness. • The reduction in EMG activity in these muscles at sleep onset is greater in OSA patients than normals. • OSA patients have a reduced ability to compensate for factors that predispose them for upper airway collapse • Increased negative pharyngeal pressures during inspiration • Reductions in upper airway muscle tone

  8. OSA and the Surgical Patient • Impact of sedatives, anesthetics, and analgesics (opioids) on respiratory function • Dose dependent depression of muscle activity of the upper airway muscles • Depression of central respiratory output/upper airway reflexes • Increased collapsibility of the upper airway • Direct action (peripheral) on hypoglossal (tongue) and phrenic (diaphragm) nerves • Phrenic nerve depression – decreases in lung volume • Alterations in apneic threshold/sensitivity to hypoxemia • Alterations in the chemical/metabolic/behavioral control of breathing

  9. OSA and the Surgical Patient • Sympathetic nervous system activation (catecholamine excess) • Surgical stress • Hpoxemia/Hypercarbia • Arousals • Related to an increased risk of cardiac arrhythmias, cardiac ischemia and hypertension . • Majority of unexpected and unexplained postoperative deaths occur at night and within 7 days of surgery. Rosenberg, J. et al British Journal of Surgery 1992.

  10. OSA and the Surgical Patient • Postoperative factors: • Pain management: use of opioids • Positioning: supine position • Sleep fragmentation with potential REM rebound • Comorbid conditions

  11. OSA and the Surgical Patient • What is the scope of the problem? • How does the surgical process affect individuals with obstructive sleep apnea? • Does Obstructive sleep apnea result in postoperative complications more frequently than the non-OSA surgical population?

  12. Obesity Trends* Among U.S. AdultsBRFSS,1990, 1998, 2007 (*BMI 30, or about 30 lbs. overweight for 5’4” person) 1990 1998 2007 No Data <10% 10%–14% 15%–19% 20%–24% 25%–29% ≥30%

  13. OSA and the Surgical Patient • Critical points of the NHANES data • Prevalence of clinically severe obesity is increasing much faster than that of moderate obesity. Strum, R. Increase in morbid obesity in the USA. Public Health 2007, 121(7), 492-496. Data from 2000-2005. • BMI > 40 kg/m2 has increased fivefold • 1:200 adults to 1:33 adults • BMI > 50kg/m2 has increased tenfold • 1:2,000 adults to 1:200 adults

  14. OSA and the Surgical Patient • Prevalence of undiagnosed obstructive sleep apnea among adult surgical patients in an academic medical center. Finkel, K. et. al. Sleep Medicine. 2009. 10, 753-758. • Prospective, observational study. • ARES screening questionnaire • 661/2877 (23.7%) screened positive high risk for OSA. • 534 /661 (82%) screened positive no previous diagnosis of OSA • 207/661 valid 2 night HST • 73/207 (35%): moderate to severe OSA

  15. OSA and the Surgical Patient • The STOP-BANG Questionnaire Identified the Patients with Significant Exacerbations of Sleep Disordered Breathing during the Perioperative Period. P. Liao et al. • 67 patients: STOP-BANG + limited channel testing • 20 low risk : Score < 3; 47 high risk: Score >3 • High Risk patients • Pre operative AHI 10.2/hr. • PON 1 AHI 13.2/hr. • PON 3 AHI 23.2/hr. • PON 5 AHI 17.9/hr. • PON 7 AHI 16.0/hr. • STOP-BANG 6-8 predictive of patients with higher AHI

  16. OSA and the Surgical Patient • Kaw, R. et al. Chest 2012; 141(2); 436-441 • IM preop assessment and PSG databases crossmatched to identify patients underwent both PSG and non cardiac surgery. • 1784 pts , 471 pts eligible for study: 269 (57%) had OSA • Presence of OSA associated with: • Increased incidence of significant hypoxia (p=0.02) • Reintubation (p=0.048) • Unplanned ICU transfer (OR=7.6) • Overall complications (OR=9.9) • Longer length of hospital stay (OR=1.9)

  17. OSA and the Surgical Patient • Postoperative complications • Higher reintubation rates (+)/(-) • Hypoxemia / Hypercarbia (+) • Arrhythmias • Myocardial ischemia • Increased transfers to higher level of care (+)/(-) • Increased length of hospitalization (+)/(-) • Delirium • Reationship to severity of OSA (AHI) (+) / (-)

  18. Screening Tools for OSA OSA and the Surgical Patient Prevalence of obstructive sleep apnea appears to be increasing in association with the increase in obesity. The prevalence of obstructive sleep apnea in individuals presenting for surgery will be increasing in the future. Results would suggest that currently approximately 25%-30% of indviduals presently for surgery will screen positive for obstructive sleep apnea. (Based primarily on screening questionnaires). These patients are at increased risk for complications and death that may be reduced with appropriate screening, diagnosis and therapy.

  19. **Clinical Management Strategy** • Preoperative Screening (Identification) • Flag patients with positive screen • Monitoring (Keeping the patient safe) • Decide on a monitoring strategy • Have an action plan • Measure outcomes • Discharge (Longitudinal evaluation and care)

  20. OSA and the Surgical Patient • OSA patients will present for surgery in one of three ways: • Known OSA compliant with therapy • Known OSA • Mild OSA – therapy not recommended • Refused therapy or non compliant • Therapy instituted – weight loss, surgery, dental appliance: status unknown • Unrecognized OSA • Goal: Minimize the number of these patients presenting for surgery

  21. OSA and the Surgical Patient Screening Tools for OSA • Why do we need a mechanism for screening? • F. Chung. Proportion of Surgical Patients with Undiagnosed Obstructive Sleep Apnoea. BJA 2013 • 819 pts (surgical population) underwent a sleep study: 234 pts in lab PSG; 585 pts 10 channel HST • Surgeons/anesthesiologists not informed of PSG results. Clinical diagnosis of OSA made by physician noted by record review. • 138/819 patients had severe OSA (AHI > 30) (17%) • 118/138 (86%) were not identified by surgeons • 65/138 (47.1%) were not identified by anesthesia

  22. OSA and the Surgical Patient Screening Tools for OSA • Criteria for Screening Tests • Disease features • Disease significantly impacts public health • Intermediate probability of disease • Detection occurs before a “critical point” • Critical point occurs before clinical diagnosis • Critical point occurs in time to affect outcome • Test features • High test sensitivity to detect minimal disease • High test specificity to minimize false positives • Screening test tolerated by patients

  23. OSA and the Surgical Patient Screening Tools for OSA • Important features: • Easy to understand • Ease of administration/scoring • Limited time requirements • Sensitivity/Specificity • Validated (PSG) • Generalizable to various patient populations • Primary care, surgical, medical, sleep clinic

  24. OSA and the Surgical Patient Screening Tools for OSA • Purpose of OSA Screening (Identification) • Eliminate or markedly reduce the unrecognized OSA patients present in a given clinical population • Stratify patients s relates to OSA risk; those at high risk expedited evaluation and treatment or higher acuity of monitoring. • Early identification and treatment may have positive impact on associated comorbid conditions • Limitation: Screening does not discriminate between mild and moderate/severe OSA. Does not identify true “at risk” patients.

  25. Screening Tools for OSA OSA and the Surgical Patient • Screening Questionnaires • Berlin Questionnaire • ASA Checklist • STOP and STOP-BANG questionnaire • Sleep Apnea Clinical Score (SACS) (Flemons) • Perioperative Sleep Apnea Prediction Score (P-SAP)

  26. Sundar, E., Chang, J., Smetana, G. (2011). Perioperative Screening for    and Management of Patients with Obstructive Sleep Apnea. Journal    of Clinical Outcomes Management, 18(9), 399-411

  27. OSA and the Surgical Patient • A Higher Score on STOP-BANG was Associated with a Higher Incidence of Post-Operative Complications. F. Chung, P. Liao • 862 pts: STOP-BANG and overnight HST (10 channel) • STOP-BANG Complications: All Exclude SaO2 • 0-2 (25%) 39.9% 4.2% • 3-5 (62%) 54.3% 14.2% • 6-8 (13%) 66.1% 18.3% • Associated with higher AHI post operatively • Both cardiac and pulmonary complications increased with increasing score; not neurologic

  28. OSA and the Surgical Patient Screening Tools for OSA • The STOP-BANG Equivalent Model and Prediction of Severity of OSA: Relation to PSG Measurements of the AHI. Farney, R. et. al. Jr of Clinical Sleep Medicine, 2011, Vol 7, No 5, 459-65. 1426 pts clincal data converted to SB with PSG This study looked at the probabilities of no, mild, moderate, severe OSA at each SB score from 0-8. Progressive increase in probability of severe OSA (4.4% to 81.9%) and progressive decrease in the probability of no OSA (52.5% to 1.1%) Results: the greater the single cumulative score on the STOP-BANG the greater the probability of more severe sleep apnea.

  29. OSA and the Surgical Patient Screening Tools for OSA • Stratification using the STOP-BANG (Chung, F.) • STOP-BANG score 0-2 Low risk of OSA • STOP-BANG score 3-4 Indeterminate risk of OSA • STOP-BANG score 5-8 High risk of OSA

  30. Screening Tools for OSA OSA and the Surgical Patient Validation of the Berlin Questionnaire and American Anesthesiologists Checklist as Screening Tools for OSA in Surgical Patients. Chung, F. et al. Anesthesiology V 108 No 5 May 2008, 822-830. Preoperative pts 18 yrs or older and without previously diagnosed OSA. 2,467 patients were screened using the three screening tools Performance of the screening tools evaluated in 177 patients that had PSG.

  31. Screening Tools for OSA OSA and the Surgical Patient • Classified as high risk of OSA • Berlin Questionnaire 33% • ASA Checklist 27% • STOP Questionnaire 28% • No significant difference in the questionnaires in the ability to identify patients with OSA. • Approximately 30% of general surgical patients will screen positive for OSA.

  32. Screening Tools for OSA OSA and the Surgical Patient • Data suggests that the use of screening questionnaires can reliably identify patients at risk for obstructive sleep apnea. • Sensitivity and negative predictive value good. Specificity fair • False positive rate is 15%-20%. • Use of any of the screening tools improves the likelihood of identifying obstructive sleep apnea.

  33. OSA and the Surgical Patient • Screen positive for Obstructive Sleep Apnea. Now what? • Evaluate and institute therapy prior to surgery or postoperatively • Treat at risk patients empirically postoperatively Use of algorithms to determine “at risk” patients • Monitor high risk patients perioperatively Intervene with therapy for cardiopulmonary difficulties. Evaluation and definitive therapy after discharge.

  34. OSA and the Surgical Patient • Sleep Consultative Service: • Sleep physician • Physician extenders • “Super nurse” • Antic, N.A. Am J Respir Crit Care Med vol 179. p 501-508, 2009 • Sleep technician/Respiratory therapist/ Sleep navigator • Template: symptoms, comorbid conditions, physical exam

  35. OSA and the Surgical Patient • Diagnostic testing: • In lab polysomnography • Limited channel testing (portable sleep testing) • Autonomic measures of sleep disordered breathing • Peripheral arterial tone (PAT) • Cardiopulmonary coupling (CPC) • Limiting factors • Time constraints • Diagnostic study • Acclimation to PAP • What to do with patients that refuse study?

  36. OSA and the Surgical Patient • Evaluate and treat patient preoperatively

  37. OSA and the Surgical Patient • Retrospective observational study: • 2 years: 431 patients screened +; 211 PSG (split) • CPAP offered to moderate/severe OSA. • Results • 49% completed the sleep study. • 138/211 (65%) had moderate to severe OSA • Median adherence (30 days) 2.5 hours. • Split night study was completed an average of 4 days prior to surgery. CPAP Adherence in Patients with Newly Diagnosed Obstructive Sleep Apnea prior to Elective Surgery. Gurainick, A. et al. Jr. Clin Sleep Med. Vol 8, No 5, 2012. 501-506. (U of Chicago)

  38. OSA and the Surgical Patient • Treat at risk patients post operatively

  39. OSA and the Surgical Patient • Does Autotitrating Positive Pressure Therapy Improve Postoperative Outcomes in Patients at Risk for OSAS. O’Gorman et. al. Chest 144 No 1, July 2013, 72-78. • 138 patients (screened 2,375 pts) • SACS > 15 high risk • 52 pts low risk; 86 pts high risk (62%) • HR pts: 43 pts routine care; 43 pts routine care + APAP. • Night before D/C. Type III sleep study • Primary endpoint: Length of stay • Secondary : ICU transfer, SpO2, cardiopulmonary events

  40. OSA and the Surgical Patient • Results: • No change in LOS; no difference in rate of postoperative complications. • Issues: • APAP use night 1: 373 mins; median use 184.5 mins. • Incomplete resolution of sleep apnea • AHI: 22.2 per hour to 13.5 per hour • Unable to differentiate obstructive vs central apnea. • P95%: 9 cm.

  41. OSA and the Surgical Patient • Treat “at risk” patients empirically postoperatively • Risk stratification algorithms • Intensity of surgery and type of anesthesia • Use of postoperative narcotics • Comorbid conditions • PACU course*

  42. OSA and the Surgical Patient • Monitor level of sedation • Richmond Agitation Sedation Scale (RASS) • Ramsey Sedation Scale • Pasero Opioid-Induced Sedation Scale (POSS) • S = Sleeping, easy to arouse • 1 = Awake and alert • 2 = Slightly drowsy, easily aroused • 3 = Frequently drowsy, arousable, drifts off to sleep during conversation * • 4 = Somnolent, minimal or no response to verbal or physical stimulation * *requires action Joint Commission Sentinel Event Alert No. 49 August 8, 2011. Safe use of opioids in the hospital.

  43. OSA and the Surgical Patient • Post operative management • Multimodality pain management • NSAID’s • Acetominophen • Tramadol • Ketamine • Gabapentin/Pregabalin • Clonidine • Dexamethasone • Dexmedetomidine (Precedex) • Alpha 2 agonist • Post operative oxygen desaturation 12-14 times more likely in OSA patients receiving opioid analgesia compared with non-opioid analgesia. • Bolden, N. et al. Anesth Analg 2008; 105: 1869-70.

  44. OSA and the Surgical Patient • CoMorbidities: should they be considered in the assessment of level of monitoring? • Higher Risk: • Atrial fibrillation* • Congestive heart failure* • Severe COPD • Coronary artery disease* • Obesity Hypoventilation Syndrome • Pulmonary Hypertension Kaw, R. Respiratory Medicine 2011, 105, 619-624. • Uncontrolled Hypertension* • Lower Risk: • Mild COPD • Hypertension • Diabetes Mellitus • Cerebrovascular disease* • Obesity BMI > 35 kg/m2*

  45. OSA and the Surgical Patient • Obesity Hypoventilation Syndrome • Meta analysis: prevalence of 19% in pts with OSA 3% in general population Obesity Hypoventilation Syndrome: an Emerging and Unrecognized Risk Factor Among Surgical Patients. Kaw et al. AJRCCM 183;2011; A3147 1784 patients both PSG and non cardiac surgery 471 eligible; 269 (57%) OSA 36/269 (13%) had ABG data. 9/36 (3%) criteria for OHS 14/269 (5%) post operative respiratory failure 44% OHS/OSA 3% OSA

  46. OSA and the Surgical Patient • Obesity Hypoventilation Syndrome • Should include screening for OHS ? • Screening all patients with OSA/+screen and BMI > 35 with awake ABG not practical • Initial screen: • HCO3 > 27 sens 92% spec 50% for hypercapnea • Mokhlesi, B. et al. Sleep and Breathing 2007; 11; 117-24. • Resting wake SpO2 < 93%. • Piper, A. Sleep Medicine Review 2011; 15; 79-89. • If both positive: resting wake ABG. • Consider preoperative sleep consultation. • Use of APAP inappropriate in these patients (AASM guidelines). Require titration to determine appropriate PAP therapy.

  47. OSA and the Surgical Patient • Sleep-Disordered Breathing in Hospital Patients: Identifying and Treating Patients at Risk. Gay, P. • Use of Sleep Apnea Clinical Score (SACS) to screen • 693 patients non cardiac surgery • Likelihood of postoperative respiratory events • High SACS: OR: 3.5 • High SACS and Recurrent events in PACU: OR: 21 • Course in PACU appears to be most predictive of subsequent postoperative respiratory events.

  48. OSA and the Surgical Patient • PACU experience (Mayo Clinic) • Initial evaluation period • 30 minutes after extubation or PACU arrival (whichever is later) • 2nd and 3rd evaluation periods at 30 minute intervals. • Criteria • Hypoventilation: < 8 bpm ( 3 episodes for yes) • Apnea: >10 secs ( 1 episode for yes) • Desaturations: SaO2 < 90% (3 episodes for yes) • Pain-Sedation Mismatch: RSS > 3; VAS > 5 • Positive: 2 or more yes defined as recurrent

  49. OSA and the Surgical Patient • Monitor high risk patients postoperatively • Positive pressure therapy if PACU difficulties

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