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Nasal High Flow Therapy in Surgical Patients With Unrecognized Obstructive Sleep Apnea (POSAII)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03964376
Recruitment Status : Suspended (due to COVID-19)
First Posted : May 28, 2019
Last Update Posted : December 29, 2020
Information provided by (Responsible Party):
Dr. Frances Chung, University Health Network, Toronto

Brief Summary:
In this study the investigators will determine whether using high flow oxygen in moderate-to-severe Obstructive Sleep Apnea patients following a major non cardiac surgery is more efficacious than usual care in preventing decrease in oxygen level in blood.

Condition or disease Intervention/treatment Phase
Obstructive Sleep Apnea Sleep Disordered Breathing Other: Nasal High Flow Other: Usual Care Not Applicable

Detailed Description:
The POSA-II trial is a culmination of the investigator's program of research to prevent postoperative adverse outcomes in surgical patients with untreated Obstructive Sleep Apnea (OSA). It is a multi center open label, randomized clinical trial of nasal high-flow vs. usual care in patients with untreated moderate-to-severe OSA undergoing major non cardiac surgery. It is a proof of concept trial to show that nasal high-flow reduces severe desaturation, the causal mechanism for OSA-related adverse events, and to collect key feasibility data for a large international multi center trial with enough power to detect effects on the clinical outcomes. Eligible patients undergoing major non cardiac surgery with high-risk OSA will have a home sleep study. One hundred and ninety patients with moderate-to-severe Sleep Apnea will be randomized into either nasal high-flow or usual care group. Sleep studies, oximetry, electrocardiogram (ECG), and Troponin will be done preoperatively. Postoperatively, ECG and Troponin will be determined daily for the 1st three days, and nocturnal oximetry for the 1st 3 nights. Patients will be followed during their hospitalization and for 30 days postoperatively to ascertain any adverse outcomes. A blinded clinical events committee will adjudicate all components of the composite outcome.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 190 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: Nasal High Flow Therapy Versus Postoperative Usual Care in Surgical Patients With Unrecognized Obstructive Sleep Apnea: A Randomized Controlled Trial (A PHASE 2 STUDY)
Actual Study Start Date : October 1, 2019
Estimated Primary Completion Date : June 15, 2021
Estimated Study Completion Date : December 15, 2021

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Nasal High Flow Group
Nasal High-Flow oxygen delivery will be applied starting at airflow of minimum 20 Litre/minute. It will be titrated in 15Litre/minute increments to 35 Litre/minute and a maximum 50 Litre/minute as determined by patient comfort. O2 supplementation will be managed by the anesthesia and surgical health care team to maintain the oxygen saturation level in the blood between 92-95%. In the Nasal High-Flow group, when SPO2 is in the range of 92-95%, air will be given instead of oxygen for the 1st 3 nights and during the day, if required, till discharge, whichever is earlier.
Other: Nasal High Flow
Delivery of oxygen via OptiflowTM system (AirvoTM, Fisher & Paykel Inc.) with airflow of 20 to 50 Litre/minute

Usual Care Group
In the usual care, patients will receive oxygen at 2-4 Litre/minute via nasal cannula or 6 Litre/minute via facemask titrated to keep SpO2 level in the range of 92-95%. When SpO2 level reaches in the range of 92-95%, oxygen delivery will be discontinued.
Other: Usual Care
Delivery of oxygen at 2-4 Litre/minute via nasal cannula or 6 Litre/minute via face mask

Primary Outcome Measures :
  1. Oxygen Desaturation Index (ODI) [ Time Frame: 72 hours ]
    The investigators will measure Oxygen Desaturation Index(the number of desaturation events per hour) by using Pulsox 300i for maximum of three nights post-operatively at the hospital preventing the severe desaturation in surgical patients with untreated moderate-to-severe OSA undergoing major non cardiac surgery. Higher values of ODI are considered worst. If successful, it will provide feasibility data for the performance of a large randomized clinical trial focusing on clinical outcomes and the cost effectiveness of the therapy to the health care system.

Secondary Outcome Measures :
  1. Time (minutes) spent below 90% and 80% SpO2 (T90, T80) [ Time Frame: 72 hours ]
    The investigators will measure the time spent in minutes with SpO2 between 0% to %79 (T80) and the time spent in minutes with SpO2 between 0% to 89% (T90). ODI, T90 and T80 will serve as surrogate outcomes of adverse events in the pilot study. In POSA study, an increase in time spent with SpO2 <80% after surgery was associated with a higher risk of postoperative vascular events under usual care.

  2. Compliance to Nasal High-Flow [ Time Frame: 72 hours ]
    To determine the tolerability and adherence of patients with OSA to Nasal High-Flow in the wards using a 10-point numeric rating scale to grade general discomfort, in which points 0 to 3 means not comfortable, 4 to 6 means comfortable and 7 to 10 means the most comfortable.

  3. Titration protocol of nasal high-flow [ Time Frame: 72 hours ]
    The appropriate titration protocol of nasal high-flow will be measured; FiO2: flow rates.

  4. The rate of postoperative adverse events [ Time Frame: 30 days ]
    The rate of postoperative cardiovascular events will be collected during hospitalization and following discharge from hospital, emergency department (if visited) and physician records, and patient by phone at day 30. Adjudicators who are blinded to the results of the ECG, Troponin, sleep study and oximetry will evaluate outcome events.

Information from the National Library of Medicine

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Ages Eligible for Study:   45 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Adult, age ≥45 years, undergoing major elective non cardiac surgery under general and/or regional anesthesia with anticipated overnight stay or longer in hospital
  • Patients with untreated moderate-to-severe Obstructive Sleep Apnea.
  • STOP-Bang score 5 or higher

Exclusion Criteria:

  • Predetermined need for postoperative CPAP therapy or ventilation,
  • Cheyne-Stokes respiration or Central Apnea,
  • Oxygen dependent due to moderate to severe chronic obstructive lung disease available Forced Expiratory Volume at 1 second of < 50% predicted) or advanced interstitial lung disease,
  • Pre-existing chronic hypercapnia or obesity hypoventilation syndrome, Intracranial and otolaryngological procedures, and
  • Unable to use nasal high-flow (nasal/oral malformations, pre-existing tracheostomy, planned postoperative nasal packing).

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03964376

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Canada, Ontario
St. Michael's Hospital
Toronto, Ontario, Canada, M5B 1W8
Toronto General Hospital
Toronto, Ontario, Canada, M5G 2C4
Toronto Western Hopsital, Dept. of Anesthesia
Toronto, Ontario, Canada, M5T2S8
Hong Kong
Prince of Wales Hospital
Hong Kong, Hong Kong
Hospital Kuala Lumpur
Kuala Lumpur, Malaysia
University Malaya Medical Centre
Kuala Lumpur, Malaysia
Khoo Teck Puat Hospital
Singapore, Singapore
Singapore General Hospital
Singapore, Singapore
Sponsors and Collaborators
University Health Network, Toronto
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Principal Investigator: Frances Chung, MBBS FRCPC University of Toronto/ University Health Network
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Responsible Party: Dr. Frances Chung, Principal Investigator, University Health Network, Toronto Identifier: NCT03964376    
Other Study ID Numbers: November 27,2018
First Posted: May 28, 2019    Key Record Dates
Last Update Posted: December 29, 2020
Last Verified: December 2020

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Dr. Frances Chung, University Health Network, Toronto:
Sleep Apnea
Additional relevant MeSH terms:
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Sleep Apnea Syndromes
Sleep Apnea, Obstructive
Respiration Disorders
Respiratory Tract Diseases
Signs and Symptoms, Respiratory
Sleep Disorders, Intrinsic
Sleep Wake Disorders
Nervous System Diseases