Pulsed Eco Doppler for Polmonal Discharge Velocity

In the context of trauma, lung ultrasound has proven to be an indispensable tool for identifying pneumothorax. Two ultrasound signs confirm the presence of pnx : the absence of pleural gliding and the finding of the lung point, which is the point where the partially collapsed lung regains contact with the pleural leaflets. However, it is not always easy to be able to detect these two signs especially in the field of urgency-emergency, which is why the authors of the extended focused assessment sonography for trauma (EFAST) proposed to include in the extended ultrasound study the use of Color Doppler by attributing the terms "power slide" to confirm the presence of pleural motion and be able to exclude pneumothorax. The use of Color Doppler has always been used for the identification of blood vessels based on the movement of blood flow. The unusual use of Color Doppler in this context finds its rationale in the physical principle that the Doppler wave senses the motion of approaching and receding from the probe regardless of whether the insonated object is a vascular structure or a biological tissue.

The literature shows that pulmonary Doppler was used in a pilot study to analyze pulmonary vessels in healthy individuals and compare it with individuals in whom pulmonary embolism was established by CT angiography.

In contrast, the use of pulsed Doppler or tissue Doppler to measure the rate of lung parenchyma sliding has not yet been investigated.

Therefore, it is unclear whether pulsed Doppler can measure the velocity of lung gliding and whether this measurement correlates with flow values collected during a spirometric examination in healthy or affected volunteer subjects in spontaneous breathing or during mechanical ventilation in intubated subjects. It is unknown whether there is a correlation between the velocimetric parameters generated by the Doppler wave with the main ventilatory parameters (Current Volume, Compliance, Plateau pressure, PEEP, Driving pressure constant Tau). There is currently no correlation between B-mode ultrasound pathological patterns with velocimetry data.

Inclusion criteria

• Age >= 18 years
• Acquisition of Informed Consent

Exclusion criteria

• Patients admitted to undergo major thoracic surgery.
• Remote pathological history positive for recurrent PNX (≥ 2), pleural thalking or pleurodesis
• Patients presenting with absolute and relative contraindications to spirometry for1 and 2a patients ie:

recent myocardial infarction (within the past 3 months) or unstable angina hemoptysis thoracic aortic aneurysm