Pulsed Eco Doppler for Polmonal Discharge Velocity

LUNG

PULSED ECO DOPPLER, LUNG

Chest ultrasound is increasingly being used in the diagnosis and management of the respiratory patient. With ultrasound, ultrasound artifacts representing the lung during inspiration and during exhalation are visualized and analyzed. During inspiration, the lung inflates with air while when exhaling, the lung empties. These two phases are visualized on ultrasound with a sliding motion of the pleural line, which represents the margin of the lung. The aim of the study is to identify the speed of filling and emptying of the lung by studying the characteristics of the pulsed Doppler wave to measure the speed of lung sliding as the significance of this finding has not yet been clarified. In both healthy subjects and patients with lung disease, it is not known whether there is a correlation between velocity measured by the Doppler wave with the main data recorded by a mechanical ventilator or spirometer.

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.

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