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Awake prone positioning (APP) has been proven to reduce the intubation rate for patients with COVID-19-induced hypoxemic respiratory failure. Our recent meta-analysis found APP was only effective for patients who were treated by high-flow nasal cannula (HFNC), not for patients using conventional oxygen therapy (COT).In a recent multicenter RCT, Perkins and colleagues reported that continuous positive airway pressure (CPAP) was superior to HFNC and conventional oxygen therapy in reducing intubation rate. Thus, it is essential to evaluate the physiological mechanism of APP under different respiratory supports, such as COT, HFNC, or CPAP.
We hypothesize that HFNC or CPAP is more effective when combined with APP than COT combined with APP. Electrical impedance tomography (EIT imaging) has been broadly utilized to assess patient ventilation homogeneity and respiratory volume monitor (RVM) has been used to evaluate patient's tidal volumes breath-by-breath. In this study, 20 healthy volunteers will use different respiratory support devices (HFNC, CPAP, and COT) in different settings and their combinations withAPP in a random sequence, assessed by EIT and RVM.
Awake prone positioning (APP) has been proven to reduce the intubation rate for patients with COVID-19-induced hypoxemic respiratory failure. Our recent meta-analysis found APP was only effective for patients who were treated by high-flow nasal cannula (HFNC), not for patients using conventional oxygen therapy (COT).In a recent multicenter RCT, Perkins and colleagues reported that continuous positive airway pressure (CPAP) was superior to HFNC and conventional oxygen therapy in reducing intubation rate. Thus, it is essential to evaluate the physiological mechanism of APP under different respiratory supports, such as COT, HFNC, or CPAP.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| awake prone positioning with room air | Active Comparator | Participants will stay in the prone position |
|
| awake prone positioning with high-flow nasal cannula | Experimental | Participants will stay in the prone position and breathe with high-flow nasal cannula |
|
| awake prone positioning with continuous positive airway pressure | Experimental | Participants will stay in the prone position and breathe with continuous positive airway pressure via face mask |
|
| supine position with room air | No Intervention | Participants will stay in the supine position | |
| supine position with high-flow nasal cannula | Active Comparator | Participants will stay in the supine position and breathe with high-flow nasal cannula |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| awake prone positioning with advanced respiratory support (high-flow nasal cannula or continuous positive airway pressure) | Other | in this group, healthy subjects will stay in prone position for 20 mins with respiratory support of high-flow nasal cannula or CPAP |
| Measure | Description | Time Frame |
|---|---|---|
| ventilation distribution assessed by EIT | Regional ventilation assessed by regional tidal impedance variations relative to global tidal impedance variation (ΔzROI/Δzglobal) obtained by electrical impedance tomography (EIT) | 20 minutes |
| Measure | Description | Time Frame |
|---|---|---|
| tidal volume | the gas volume during tidal breathing | 20 minutes |
| respiratory rates | breathing frequency during tidal breathing | 20 minutes |
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Inclusion Criteria:
healthy adults aged between 21 to 65 years
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Jie Li, PhD | Rush University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Rush University Medical Center | Chicago | Illinois | 60612 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 35072713 | Background | Perkins GD, Ji C, Connolly BA, Couper K, Lall R, Baillie JK, Bradley JM, Dark P, Dave C, De Soyza A, Dennis AV, Devrell A, Fairbairn S, Ghani H, Gorman EA, Green CA, Hart N, Hee SW, Kimbley Z, Madathil S, McGowan N, Messer B, Naisbitt J, Norman C, Parekh D, Parkin EM, Patel J, Regan SE, Ross C, Rostron AJ, Saim M, Simonds AK, Skilton E, Stallard N, Steiner M, Vancheeswaran R, Yeung J, McAuley DF; RECOVERY-RS Collaborators. Effect of Noninvasive Respiratory Strategies on Intubation or Mortality Among Patients With Acute Hypoxemic Respiratory Failure and COVID-19: The RECOVERY-RS Randomized Clinical Trial. JAMA. 2022 Feb 8;327(6):546-558. doi: 10.1001/jama.2022.0028. | |
| 28762180 |
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| supine position with continuous positive airway pressure | Active Comparator | Participants will stay in the supine position and breathe with continuous positive airway pressure via face mask |
|
| comfort | subject's comfort which will be assessed by a 1-10 scale | 20 minutes |
| Background |
| Mauri T, Alban L, Turrini C, Cambiaghi B, Carlesso E, Taccone P, Bottino N, Lissoni A, Spadaro S, Volta CA, Gattinoni L, Pesenti A, Grasselli G. Optimum support by high-flow nasal cannula in acute hypoxemic respiratory failure: effects of increasing flow rates. Intensive Care Med. 2017 Oct;43(10):1453-1463. doi: 10.1007/s00134-017-4890-1. Epub 2017 Jul 31. |
| 23050520 | Background | Riera J, Perez P, Cortes J, Roca O, Masclans JR, Rello J. Effect of high-flow nasal cannula and body position on end-expiratory lung volume: a cohort study using electrical impedance tomography. Respir Care. 2013 Apr;58(4):589-96. doi: 10.4187/respcare.02086. |
| 34928455 | Background | Chiumello D, Chiodaroli E, Coppola S, Cappio Borlino S, Granata C, Pitimada M, Wendel Garcia PD. Awake prone position reduces work of breathing in patients with COVID-19 ARDS supported by CPAP. Ann Intensive Care. 2021 Dec 20;11(1):179. doi: 10.1186/s13613-021-00967-6. |
| 35768877 | Background | Liu L, Xie J, Wang C, Zhao Z, Chong Y, Yuan X, Qiu H, Zhao M, Yang Y, Slutsky AS. Prone position improves lung ventilation-perfusion matching in non-intubated COVID-19 patients: a prospective physiologic study. Crit Care. 2022 Jun 29;26(1):193. doi: 10.1186/s13054-022-04069-y. No abstract available. |
| 34425070 | Result | Ehrmann S, Li J, Ibarra-Estrada M, Perez Y, Pavlov I, McNicholas B, Roca O, Mirza S, Vines D, Garcia-Salcido R, Aguirre-Avalos G, Trump MW, Nay MA, Dellamonica J, Nseir S, Mogri I, Cosgrave D, Jayaraman D, Masclans JR, Laffey JG, Tavernier E; Awake Prone Positioning Meta-Trial Group. Awake prone positioning for COVID-19 acute hypoxaemic respiratory failure: a randomised, controlled, multinational, open-label meta-trial. Lancet Respir Med. 2021 Dec;9(12):1387-1395. doi: 10.1016/S2213-2600(21)00356-8. Epub 2021 Aug 20. |
| 35305308 | Result | Li J, Luo J, Pavlov I, Perez Y, Tan W, Roca O, Tavernier E, Kharat A, McNicholas B, Ibarra-Estrada M, Vines DL, Bosch NA, Rampon G, Simpson SQ, Walkey AJ, Fralick M, Verma A, Razak F, Harris T, Laffey JG, Guerin C, Ehrmann S; Awake Prone Positioning Meta-Analysis Group. Awake prone positioning for non-intubated patients with COVID-19-related acute hypoxaemic respiratory failure: a systematic review and meta-analysis. Lancet Respir Med. 2022 Jun;10(6):573-583. doi: 10.1016/S2213-2600(22)00043-1. Epub 2022 Mar 16. |
| ID | Term |
|---|---|
| D045422 | Continuous Positive Airway Pressure |
| ID | Term |
|---|---|
| D011175 | Positive-Pressure Respiration |
| D012121 | Respiration, Artificial |
| D058109 | Airway Management |
| D013812 | Therapeutics |
| D012138 | Respiratory Therapy |
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