According to Dameshek, true polycythemia (polycythemia vera: PV) is a chronic myeloproliferative disorder of the total bone marrow without any evidence of invasiveness, in which erythrocytosis, leukocytosis, and thrombocytosis are all simultaneously present.
However, in patients suffering from connective tissue disease or lung cancer, chest pain may persist for long periods. What Causes Pleurisy? Pleurisy may occur inhealthy, young people who have an infection in the lungs caused by bacteria or virus. Pleurisy may last a few days or up to two weeks. In rare cases, the infection may spread, causing pleurisy in other people. Pleurisy may also be associated with air leaking in the pleural cavity from a punctured lung, a condition called pneumothorax.
Some surgeons say that the fact that the chest tube is left in place causes increased build up of pleural fluid and that is what we are seeing. There is a growing opinion that chest tubes should be removed as early as possible after cardiac surgery (even as early as within the first 24 hour period). Most places remove tubes if they have drained less than 100 ml in the last 8-hour period.