A New Ultrasonographic Tool to Assess Pulmonary Strain in the ICU
- Conditions
- Mechanical Ventilation ComplicationVentilator-Induced Lung Injury
- Registration Number
- NCT03405779
- Lead Sponsor
- Centre hospitalier de l'Université de Montréal (CHUM)
- Brief Summary
The primary objective of the study is to create a small dataset of regional pulmonary strain values in patients suffering from pulmonary diseases under mechanical ventilation in an intensive care setting.
Hypothesis: The analysis of lung ultrasonographic sequences using speckle-tracking allows the determination of local pleural strain in 4 predetermined pulmonary areas in mechanically ventilated patients suffering from pulmonary diseases.
- Detailed Description
Mechanical ventilation is frequently used in the intensive care settings. Although essential in many cases, mechanical ventilation can be responsible for ventilator-induced lung injury (VILI). The relationship between mechanical ventilation and VILI has been clearly demonstrated in animals and is highly suspected in humans. The putative mechanism responsible for VILI is excessive pulmonary strain or overdistension. Frequently observed in mechanically ventilated patients, the presence of severe pulmonary disease can increase the risk of overdistension. The development of a tool allowing early detection of pulmonary overdistension would represent a great asset in the prevention of VILI by allowing safer adjustments of mechanical ventilation parameters. Ultrasonographic imaging is a non-radiant, non-invasive technique already available in the intensive care setting. Presently used for cardiac strain measurements, ultrasonography is a promising avenue to assess pulmonary strain.
This pilot study will aim to create a small dataset of local pleural strain values assessed in 4 predetermined pulmonary areas using ultrasonographic imaging in mechanically ventilated patients suffering from pulmonary diseases in the intensive care setting. This dataset will be used to help plan larger scale studies.
Methods:
Intensive care patients under mechanical ventilation will undergo imaging of the pleura at 4 predetermined areas. The sites to be studied will be: the 3rd intercostal space at the mid-clavicular line (left and right side), the 8th intercostal space at the posterior axillary line (left and right side). Three consecutive respiratory cycles at each site will be recorded for subsequent analysis.
Lung ultrasonography will be performed by the principal investigator and a co-investigator using a Terason (Teratech Corporation, Burlington, MA) device and a 12L5 linear ultrasound probe. For each image, the probe will be oriented perpendicularly to the pleura with the pointer towards the participant's head. The beam's focal zone will be positioned at the level of the pleural line.
Using a reference ultrasonographic image, an experienced lung ultrasonographer will segment the pleura. From this image, an algorithm will define a region of interest which will be followed throughout the rest of the images of the video sequence. Thereafter, the algorithm will calculate the various components of pulmonary strain. An experienced technician will visually validate the algorithm's tracking.
Recruitment & Eligibility
- Status
- RECRUITING
- Sex
- All
- Target Recruitment
- 10
- Adult intensive care patients under mechanical ventilation suffering from a pulmonary disease with a static lung compliance of less than 40 mL/cm H2O.
- Obesity (Body Mass Index superior to 30 kg/m2)
- Previous thoracic procedure (chest tube, thoracotomy, thoracoscopy)
- Intra-abdominal pressure inferior to 15 mm Hg (if available)
- Previous participation to the study
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method Average absolute lateral deformation At the end of study on Day 1 Change in percentage from baseline expiratory value
- Secondary Outcome Measures
Name Time Method Average absolute axial deformation At the end of study on Day 1 Change in percentage from baseline expiratory value
Cumulated range of absolute lateral deformation At the end of study on Day 1 Change in percentage from baseline expiratory value
Cumulated range of absolute axial deformation At the end of study on Day 1 Change in percentage from baseline expiratory value
Average von mises At the end of study on Day 1 Change in percentage from baseline expiratory value
Average absolute lateral shear At the end of study on Day 1 Change in percentage from baseline expiratory value
Cumulated range of absolute lateral shear At the end of study on Day 1 Change in percentage from baseline expiratory value
Trial Locations
- Locations (1)
Centre Hospitalier de l'Université de Montréal (CHUM)
🇨🇦Montréal, Quebec, Canada