Acute Respiratory Distress Syndrome Clinical Trial
Official title:
Estimating the Transpulmonary Pressure From the Central Venous Pressure in Mechanically Ventilated Patients With Respiratory Failure
Central venous pressure (CVP) is characterized by a low-frequency pleural-dependent as well as a high-frequency cardiac pulsatile component. The aim of the study is to compare the low-frequency component of CVP with the esophageal pressure (Pes), as surrogate of pleural pressure, to estimate trans-pulmonary pressure (PL).
The investigators will enroll mechanically ventilated patients admitted to the intensive care unit with the diagnosis of respiratory failure monitored with a dedicated nasogastric catheter and a central venous catheter for measuring Pes and CVP, respectively. Electrocardiogram trace, Pes, CVP and airway pressure (Paw) will be recorded at the end of inspiratory and expiratory pauses. The CVP waveforms will be analyzed off-line using a dedicated low-pass digital filter to obtain the low-frequency component of CVP (filtered CVP, fCVP). Paw, Pes and fCVP will be used to calculate PL using transpulmonary driving pressure formula (PL-Pes and PL-fCVP, respectively). The PL values obtained with fCVP and Pes will be compared to assess the correlation of the two methods. ;
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