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definition : pleurisy

Pleurisy, also known as pleuritis, is inflammation of the membranes (pleurae) that surround the lungs and line the chest cavity. Occasionally the pain may be a constant dull ache.

The most common cause is a viral infection. The underlying mechanism involves the rubbing together of the pleurae instead of smooth gliding.

Treatment depends on the underlying cause. Incentive spirometry may be recommended to encourage larger breaths. Descriptions of the condition date from at least as early as 400 BC by Hippocrates.

== Signs and symptoms == The defining symptom of pleurisy is a sudden sharp, stabbing, burning or dull pain in the right or left side of the chest during breathing, especially when one inhales and exhales. It feels worse with deep breathing, coughing, sneezing, or laughing. The pain may stay in one place, or it may spread to the shoulder or back. Sometimes, it becomes a fairly constant dull ache.

Depending on its cause, pleuritic chest pain may be accompanied by other symptoms: Viral infection (coxsackie B virus, HRSV, CMV, adenovirus, EBV, parainfluenza, influenza) is the most common cause of pleurisy. However, many other different conditions can cause pleuritic chest pain: The procedure to remove fluid in the chest is called a diagnostic thoracentesis. The doctor inserts a small needle or a thin, hollow, plastic tube in the chest wall and withdraws fluid.

Thoracentesis can be done in the doctor's office or at the hospital. Ultrasound is used to guide the needle to the fluid that is trapped in small pockets around the lungs.

Thoracentesis usually does not cause serious complications. Generally, a chest x-ray is done after the procedure to evaluate the lungs. Possible complications of thoracentesis include the following: * Bleeding and bruising where the needle went in. In rare cases, bleeding may occur in or around the lung. The doctor can use a chest tube to drain the blood. In some cases, surgery is needed. * Infection where the needle went in * Injury to the liver or spleen (in rare cases) * Pain. * Pneumothorax, or buildup of air in the pleural space, with a collapsed or partially collapsed lung. Sometimes air comes in through the needle or the needle makes a hole in the lung. Usually, a hole seals itself—but sometimes air builds up around the lung and makes it collapse. A chest tube removes the air and lets the lung expand again.

The lung fluid is examined under a microscope and is evaluated for the presence of chemicals and for its color and texture. The degree of clarity is an indicator of infection, cancer, or other conditions that may be causing the buildup of fluid or blood in the pleural space.

==== Biopsy ==== If tuberculosis or cancer is suspected, a small piece of the pleura may be examined under a microscope to make a definitive diagnosis. This is called a biopsy.

Several approaches to taking tissue samples are available # Insertion of a needle through the skin on the chest to remove a small sample of the outer layer of the pleura # Insertion of a small tube with a light on the end (endoscope) into tiny cuts in the chest wall to visualize the pleura, and biopsy of small pieces of tissue through the endoscope # Removal of a sample of the pleura through a small cut in the chest wall (open pleural biopsy), usually done if the sample from the needle biopsy is too small for accurate diagnosis

== Treatment == Treatment has several goals: * Codeine-based cough syrups to control the cough

There may be a role for the use of corticosteroids (for tuberculous pleurisy), tacrolimus (Prograf) and methotrexate (Trexall, Rheumatrex) in the treatment of pleurisy. Further studies are needed.

=== Lifestyle changes === The following may be helpful in the management of pleurisy: * Lying on the painful side may be more comfortable * Breathing deeply and coughing to clear mucus as the pain eases. Otherwise, pneumonia may develop. * Getting rest

=== Treating the cause === Ideally, the treatment of pleurisy is aimed at eliminating the underlying cause of the disease. * If the pleural fluid is infected, treatment involves antibiotics and draining the fluid. If the infection is tuberculosis or from a fungus, treatment involves long-term use of antibiotics or antifungal medicines. * If the fluid is caused by tumors of the pleura, it may build up again quickly after it is drained. Sometimes anti-tumor medicines prevent further fluid buildup. If they don't, the doctor may seal the pleural space. This is called pleurodesis. Pleurodesis involves the drainage of all the fluid out of the chest through a chest tube. A substance is inserted through the chest tube into the pleural space. This substance irritates the surface of the pleura. This causes the two layers of the pleurae to squeeze shut so there is no room for more fluid to build up. * Chemotherapy or radiation treatment also may be used to reduce the size of the tumors. * If congestive heart failure is causing the fluid buildup, treatment usually includes diuretics and other medicines.

The treatment for pleurisy depends on its origin and is prescribed by a physician on a base of an individual assessment. Paracetamol (acetaminophen) and amoxicillin, or other antibiotics in case of bacterial infections, are common remedies dispensed by doctors to relieve the initial symptoms and pain in the chest, while viral infections are self-limited. Non-steroidal anti-inflammatory drugs (NSAIDs), preferably indometacin, are usually employed as pain control agents.

=== Alternative treatments === A number of alternative or complementary medicines are being investigated for their anti-inflammatory properties, and their use in pleurisy. At this time, clinical trials of these compounds have not been performed.

Extracts from the Brazilian folk remedy Wilbrandia ebracteata ("Taiuia") have been shown to reduce inflammation in the pleural cavity of mice. The extract is thought to inhibit the same enzyme, cyclooxygenase-2 (COX-2), as the non-steroidal anti-inflammatory drugs.

== Related problems == Pleurisy is often associated with complications that affect the pleural space.

=== Pleural effusion === In some cases of pleurisy, excess fluid builds up in the pleural space. This is called a pleural effusion. The buildup of fluid usually forces the two layers of the pleura apart so they don't rub against each other when breathing. This can relieve the pain of pleurisy. A large amount of extra fluid can push the pleura against the lung until the lung, or a part of it, collapses. This can make it hard to breathe.

In some cases of pleural effusion, the extra fluid gets infected and turns into an abscess. This is called an empyema.

Pleural effusion involving fibrinous exudates in the fluid may be called fibrinous pleurisy. It sometimes occurs as a later stage of pleurisy.

A person can develop a pleural effusion in the absence of pleurisy. For example, pneumonia, heart failure, cancer, or a pulmonary embolism can lead to a pleural effusion.

=== Pneumothorax === Air or gas also can build up in the pleural space. This is called a pneumothorax. It can result from acute lung injury or a lung disease like emphysema. Lung procedures, like surgery, drainage of fluid with a needle, examination of the lung from the inside with a light and a camera, or mechanical ventilation, also can cause a pneumothorax.

The most common symptom is sudden pain in one side of the lung and shortness of breath. A pneumothorax also can put pressure on the lung and cause it to collapse.

If the pneumothorax is small, it may go away on its own. If large, a chest tube is placed through the skin and chest wall into the pleural space to remove the air.

=== Hemothorax === Blood also can collect in the pleural space. This is called hemothorax. The most common cause is injury to the chest from blunt force or surgery on the heart or chest. Hemothorax also can occur in people with lung or pleural cancer.

Hemothorax can put pressure on the lung and force it to collapse. It also can cause shock, a state of hypoperfusion in which an insufficient amount of blood is able to reach the organs.

== Prognosis == Pleurisy and other disorders of the pleurae can be serious, depending on what caused them. Generally, pleurisy treatment has an excellent prognosis, but if left untreated it can cause severe complications. For example, a resulting pulmonary heart disease cor pulmonale, which manifests itself with an inflammation of the arms and legs, can lead to heart failure. If the conditions that caused the pleurisy or other pleural disorders were adequately diagnosed and treated early, one can expect a full recovery. Help of a pulmonologist (respiratory physician in the U.K. and Australia) may be enlisted to address the underlying cause and chart post-illness rehabilitation.

== References ==

== External links ==

* * [ The Lung Association of Canada explanation of Pleurisy (also available in French)] * [ Pleurisy] by the American Academy of Family Physicians

Category:Diseases of pleura Category:Inflammations Category:Symptoms and signs: Respiratory system Category:RTT Category:RTTEM

Texte soumis à la licence CC-BY-SA. Source : Article de Wikipédia

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