Pleural fluid examination

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Pleural fluid examination

  1. 1. Pleural Fluid Examination Presented By: Nasir Nazeer
  2. 2. Pleural Fluid Pleural fluid is the fluid that is found between the layers of the pleura, the membranes that line the thoracic cavity and surround the lungs. The space containing the fluid is referred as the pleural cavity. Normal pleural fluid consists of a small amount of a thin (serous) fluid that functions as a lubricant during breathing. An excess amount of pleural fluid can be caused by many conditions and is known as a pleural effusion. Some common causes of pleural effusions include heart failure, pneumonia, and autoimmune diseases such as rheumatoid arthritis.
  3. 3. Pleural Fluid If doctor finds that patient have too much pleural fluid, he may recommend that a sample of the fluid be removed by a procedure called thoracentesis and sent for analysis to help determine the cause (pleural fluid cytology). With lung cancer, an excess amount of pleural fluid (pleural effusion) is quite common, and can be either benign (noncancerous) or due to the spread of lung cancer cells into the pleural cavity (malignant pleural effusion). Pleural fluid analysis is used to help diagnose the cause of inflammation of the pleura (pleuritis) and/or accumulation of fluid in the pleural space (pleural effusion). There are two main reasons for fluid accumulation, and an initial set of tests (fluid protein, albumin, or LDH level, cell count, and appearance) is used to differentiate between the two types of fluid that may be produced.
  4. 4. Pleural Fluid (Transudate) An imbalance between the pressure within blood vessels (which drives fluid out of the blood vessel) and the amount of protein in blood (which keeps fluid in the blood vessel) can result in accumulation of fluid (called a transudate). Transudates are most frequently caused by congestive heart failure or cirrhosis. If the fluid is determined to be a transudate, then usually no more tests on the fluid are necessary.
  5. 5. Pleural Fluid (Exudate) Injury or inflammation of the pleurae may cause abnormal collection of fluid (called an exudate). If the fluid is an exudate, then additional testing is often ordered. Exudates are associated with a variety of conditions and diseases, including:      Infectious diseases – caused by viruses, bacteria, or fungi. Infections may originate in the pleurae or spread there from other places in the body. For example, pleuritis and pleural effusion may occur along with or following pneumonia. Bleeding – bleeding disorders, pulmonary embolism, or trauma can lead to blood in the pleural fluid. Inflammatory conditions – such as lung diseases, chronic lung inflammation for example due to prolonged exposure to large amounts of asbestos (asbestosis), sarcoidosis, or auto-immune disorders such as rheumatoid arthritis and systemic lupus erythematosus Malignancies – such as lymphoma, leukemias, lung cancer, metastatic cancers Other conditions – idiopathic, cardiac bypass surgery, heart or lung transplantation, pancreatitis, or intra-abdominal abscesses
  6. 6. Additional testing on exudate fluid Pleural fluid glucose, lactate, amylase, triglyceride, and/or tumor markers Microscopic examination – Normal pleural fluid has small numbers of white blood cells (WBCs) but no red blood cells (RBCs) or microorganisms. Laboratories may examine the pleural fluid and/or use a special centrifuge (cytocentrifuge) to concentrate the fluid's cells on a slide. The slide is treated with a special stain and evaluated for the different kinds of cells that may be present. Gram stain – for direct observation of bacteria or fungi under a microscope. There should be no organisms present in pleural fluid. Bacterial culture and susceptibility testing – ordered to detect any microorganisms that may be present in the pleural fluid and to guide antimicrobial therapy. Less commonly ordered tests for infectious diseases, such as tests for viruses, mycobacteria (AFB smear and culture), and parasites.
  7. 7. How to prepare patient for the Test? The test is no more invasive than having blood drawn. There is no special preparation. Patient should not cough, breathe deeply, or move during the test to avoid injury to the lung. Patient may have a chest x-ray before or after the test.
  8. 8. How to prepare patient for the Test? (Contd…) Patient should be directed to sit on the edge of a chair or on bed with his head and arms resting on a table. Clean the skin around the insertion site and drape the area. A local pain-killing medicine (anesthetic) is injected into the skin, which stings a bit, but only for a few seconds. The thoracentesis needle is inserted above the rib into the pocket of fluid. As fluid drains into a collection bottle, many people cough a bit as the lung re-expands to fill the space where fluid had been. This sensation normally lasts for a few hours after the test is completed. Patient should tell to health care provider if he has sharp chest pain or shortness of breath
  9. 9. Risks involved in Thoracentesis Collapse of the lung (pneumothorax) Excessive loss of blood Fluid re-accumulation Infection Pulmonary edema Respiratory distress Fainting
  10. 10. Test results interpretation Test results can help to distinguish between types of pleural fluid and help to diagnose the cause of fluid accumulation. The initial set of tests performed on a sample of pleural fluid helps determine whether the fluid is a transudate or exudate.
  11. 11. Transudate Fluid and test results Transudates are most often caused by either congestive heart failure or cirrhosis. Typical fluid analysis results include: Physical characteristics—fluid appears clear Protein, albumin, or LDH level—low Cell count—few cells are present
  12. 12. Exudate Fluid and test results Exudates can be caused by a variety of conditions and diseases. Initial test results may include:     Physical characteristics—fluid may appear cloudy Protein, albumin, or LDH level—high Cell count—increased Additional test results and their associated causes may include: Physical characteristics     The normal appearance of a sample of pleural fluid is usually light yellow and clear. Abnormal results may give clues to the conditions or diseases present and may include: Milky appearance may point to lymphatic system involvement. Reddish pleural fluid may indicate the presence of blood. Cloudy, thick pleural fluid may indicate the presence of microorganisms and/or white blood cells.
  13. 13. Exudate Fluid and test results (Contd…) Chemical tests – tests that may be performed in addition to protein or albumin may include: Glucose—typically about the same as blood glucose levels. May be lower with infection and rheumatoid arthritis. Lactate levels can increase with infectious pleuritis, either bacterial or tuberculosis. Amylase levels may increase with pancreatitis, esophageal rupture, or malignancy. Triglyceride levels may be increased with lymphatic system involvement. Tumor markers may be increased with some cancers.
  14. 14. Exudate Fluid and test results (Contd…) Microscopic examination     Normal pleural fluid has small numbers of white blood cells (WBCs) but no red blood cells (RBCs) or microorganisms. Results of an evaluation of the different kinds of cells present may include: Total cell counts—the WBCs and RBCs in the sample are counted. Increased WBCs may be seen with infections and other causes of pleuritis. Increased RBCs may suggest trauma, malignancy, or pulmonary infarction. WBC differential—determination of percentages of different types of WBCs. An increased number of neutrophils may be seen with bacterial infections. An increased number of lymphocytes may be seen with cancers and tuberculosis. Cytology – a cyto-centrifuged sample is treated with a special stain and examined under a microscope for abnormal cells. This is often done when a mesothelioma or metastatic cancer is suspected. The presence of certain abnormal cells, such as tumor cells or immature blood cells, can indicate what type of cancer is involved.
  15. 15. Exudate Fluid and test results (Contd…) Infectious disease tests  Following tests may be performed to look for microorganisms if infection is suspected: Gram stain – for direct observation of bacteria or fungi under a microscope. There should be no organisms present in pleural fluid. Bacterial culture and susceptibility testing – If bacteria are present, susceptibility testing can be performed to guide antimicrobial therapy. If there are no microorganisms present, it does not rule out an infection; they may be present in small numbers or their growth may be inhibited because of prior antibiotic therapy. Less commonly, if testing for other infectious diseases is performed and is positive, then the cause of the pericardial fluid accumulation may be due to a viral infection, mycobacteria (such as the mycobacterium that causes tuberculosis), or aparasite.

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