Speckle Tracking and Inhaled Nitric Oxide in Acute Respiratory Distress Syndrome

Condition(s) studied

Investigational drug(s) / intervention(s)

TEE: The intervention within the framework of the protocol will consist, for the needs of the study, in performing 2 TEE and 5 TTE in 24 hours after For TEE: * The first TEE will allow us to evaluate the right ventricle, to look for the existence of a acute cor pulmonale, to evaluate the patient's blood volume as recommended during the management of ARDS. If the patient is included in the study, our intervention will consist in leaving this TEE in place in order to perform measurements at H0, 30min, H1 and H2 after iNO administration. * The second TEE will be performed at H24 to performed new measurements.

TTE: For TTE: • The TTEs will allow us to evaluate the anatomy of the right ventricle, to estimate the systolic pulmonary artery pressure, to calculate the cardiac output and to measure the conventional parameters of the right ventricular systolic function. This noninvasive examination will be repeated at 30 min, H1, H2, and H24 after iNO administration

Study summary

Acute cor pulmonale is one of deadly complications of mechanically ventilated acute respiratory distress syndrome (ARDS), which can lead to right ventricular dysfunction and worsen the hemodynamics of the patient. For several years, transthoracic (TTE) and transesophageal echocardiography (TEE) have replaced the pulmonary artery catheter to monitor cardiac function reliably and non-invasively.

Speckle tracking is an echocardiographic technique that allows a two-dimensional strain (2D) analysis of right ventricular systolic function. Right ventricular global strain (RVGLS) is a strain parameter, allowing an early and more accurate diagnosis of right ventricular dysfunction than conventional parameters.

This project will consist of performing TTE and TEE measurements at H0, 30min, H1, H2, and H24 after iNO administration in patient with ARDS under mechanical ventilation. The patient will be declared responder to iNO, if there is an increase of more than 20% of the PaO2/FiO2. 30 minutes after a dose of 10ppm of iNO.

Eligibility

Primary outcome measure(s)

• Variation from baseline of systolic function after iNO administration — 30 minutes
  Systolic function will be assessed with "in speckle tracking RV" in the presence or not of a response to iNO 30 minutes after its administration, Systolic function will be assessed with "in speckle tracking RV" in patients with moderate to severe ARDS under mechanical ventilation.

Trial sites (1)

More Centre Hospitalier Universitaire, Amiens trials in France

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