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The study will explore the possibility to predict potential for recruitment in acute hypoxemic respiratory failure patients by electrical impedance tomography (EIT) Swisstom BB2 (Swisstom, Landquart, Switzerland) during stepwise increase in positive end-expiratory pressure (PEEP) followed by recruitment maneuver (RM). It will compare data obtained by EIT to those obtained by pressure-volume (P-V) curves on respiratory system mechanics and data on pulmonary gas exchange.
The investigators will monitor lung ventilation by EIT during the whole protocol and perform P-V curves and arterial blood gas analysis at every step of the protocol.
Participants will be sedated and paralyzed, ventilated in volume-controlled with protective ventilation (tidal volume=6-8 mL/Kg of predicted body weight and respiratory rate set to obtain normal pH) then the protocol will follow 5 steps each lasting 20 minutes to obtain clinical stability:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Recruitment | Experimental | Lung aeration monitored by Swisstom BB2 during PEEP steps and recruitment maneuver |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Swisstom BB2 | Device | Electrical impedance tomography lung monitoring uses a dedicated belt placed around patient's thorax to detect change in impedance due to change in aeration within the thorax |
| Measure | Description | Time Frame |
|---|---|---|
| Significant reduction in silent spaces (i.e. non ventilated lung areas) during incremental PEEP steps | Within 20 minutes from PEEP increase |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Savino Spadaro, MD | Università degli Studi di Ferrara | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Azienda Ospedaliero Universitaria Sant'Anna | Ferrara | 44121 | Italy |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 30992054 | Derived | Scaramuzzo G, Spadaro S, Waldmann AD, Bohm SH, Ragazzi R, Marangoni E, Alvisi V, Spinelli E, Mauri T, Volta CA. Heterogeneity of regional inflection points from pressure-volume curves assessed by electrical impedance tomography. Crit Care. 2019 Apr 16;23(1):119. doi: 10.1186/s13054-019-2417-6. | |
| 29386048 | Derived |
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| Spadaro S, Mauri T, Bohm SH, Scaramuzzo G, Turrini C, Waldmann AD, Ragazzi R, Pesenti A, Volta CA. Variation of poorly ventilated lung units (silent spaces) measured by electrical impedance tomography to dynamically assess recruitment. Crit Care. 2018 Jan 31;22(1):26. doi: 10.1186/s13054-017-1931-7. |