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Background: Patients undergoing awake brain surgery are exposed to non-humidified, non-warmed oxygen/air mix flow through a face mask for a prolonged duration. This causes increased discomfort, inadequate breathing with the risk for hypoxia perioperatively. Humidified high flow nasal cannula (HFNC) oxygen therapy potentially improves patient comfort, oxygen/air exchange, improves surgical conditions and prevents atelectasis of the lung, compared to traditional oxygen administration using a face mask in patients undergoing awake brain surgery.
Results of this trial will be used to initiate a more extensive, multicenter trial to further characterize the potential impact of HFNC.
Background: Patients undergoing awake brain surgery are exposed to non-humidified, non-warmed oxygen/air mix flow through a face mask for a prolonged duration. This causes increased discomfort, inadequate breathing with the risk for hypoxia perioperatively.
Hypothesis: Humidified high flow nasal cannula (HFNC) oxygen therapy improves patient comfort, oxygen/air exchange, improves surgical conditions and prevents atelectasis of the lung, compared to traditional oxygen administration using a face mask in patients undergoing awake brain surgery.
Methods: After obtaining ethics approval and written informed patient consent, 20 patients undergoing scheduled awake brain surgery will be randomized to either HFNC therapy or standard face mask. Evaluation of patient satisfaction, pain / dry upper airway along with drawing of arterial blood gases to measure oxygen/carbon dioxide content of the blood will be performed during and after the procedure. Lung ultrasound will be performed in the recovery room to determine the presence of atelectasis.
Expected results and Significance: We expect that HFNC improves patient comfort as well as breathing / arterial oxygen content in long-duration awake brain surgery. This could result in higher patient satisfaction, shorter times in PACU, a shorter requirement for oxygen therapy, decreased risk for hypoxia during surgery and better elimination of carbon dioxide - which could lead to better surgical conditions due to softer brain tissue and therefore shorter time for the surgical procedure. Potential positive results of this trial will be used to initiate a more extensive, multicenter trial to further characterize the potential impact of HFNC.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| HFNC | Experimental | HFNC will be started at flow of 40 L/min and FiO2 of 40%. |
|
| Oxygen Mask | Other | Standard non-humidified oxygen therapy via an oxygen mask at 6 l/min will be performed. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| HFNC | Device | High flow nasal humidified oxygen HFNC is an air-oxygen blender, which provides high flow (up to 60 L/min) of warmed (36°C) and humidified gas through nasal cannula, allowing tighter control of FiO2 from 0.2 to 1.0. |
| Measure | Description | Time Frame |
|---|---|---|
| Patient comfort using VAS (1-10) | Patient comfort during awake craniotomy | During surgical procedure, an average of 6 hours |
| Measure | Description | Time Frame |
|---|---|---|
| Gas exchange (blood gas analysis) | During surgical procedure (an average of 6 hours) and 15 minutes after PACU admission | |
| Post-operative pulmonary atelectasis using Ultrasound evaluation | Up to 15 minutes before PACU discharge |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| LHSC | London | Ontario | N6A 5A5 | Canada |
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| ID | Term |
|---|---|
| D001261 | Pulmonary Atelectasis |
| ID | Term |
|---|---|
| D008171 | Lung Diseases |
| D012140 | Respiratory Tract Diseases |
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| Oxygen Mask | Device | Application of oxygen during conscious sedation |
|
| Incidence of oxygen desaturation (number of events with SaO2 < 90%) | During surgical procedure, an average of 6 hours |