The pressure is computed assuming an International standard sea-level pressure datum of 1013.25 hPa, and therefore is not necessarily the same as the aircraft's true altitude either above mean sea level or above ground level.he pressure is computed assuming an International standard sea-level pressure datum of 1013.25 hPa, and therefore is not necessarily the same as the aircraft's true altitude either above mean sea level or above ground level.
The term pleurisy (pleuritis) is inflammation or infection in the pleural space around the lungs. Pyothorax also known as empyema of the pleural cavity is the presence of pus in the pleural cavity between the layers of the pleural membrane Py/o-Pus.
There are two main categories of pleural effusions: Uncomplicated pleural effusion: The pleural effusion contains fluid that is free of serious inflammation or infection. If large enough, an uncomplicated pleural effusion can cause symptoms. However, these pleural effusions rarely cause permanent lung problems.