Qu'est-ce que la médiastinoscopie : aperçu, avantages et résultats attendus

Définition et aperçu

Mediastinoscopy is a diagnostic procedure designed to examine the mediastinum, the space behind the sternum (breastbone) located in the middle of the chest and right between the lungs. It contains several important structures including lymph nodes, the trachea (windpipe), the oesophagus (the tube that connects the throat and the stomach), the heart, and neighbouring structures, and the thymus gland. Mediastinoscopy is often performed to diagnose and determine the extent of several conditions including lung cancer, lymphome, tuberculosis, and sarcoidosis.

The procedure allows the doctor to assess the organs and the important structures inside the mediastinum. The mediastinoscope takes images that are sent to a computer screen and recorded for a detailed counselling with the patient, as well as the development of an effective and efficient treatment plan.

Mediastinoscopy is a “keyhole” surgical procedure and involves a small incision on the chest. It uses mediastinoscope, a long, thin, and flexible tube with a tiny camera and a light source on one end. Aside from recording still images or videos, the specialised tool can also take blood and tissue samples from within the mediastinum for further medical evaluation.

Qui devrait subir et résultats attendus

Mediastinoscopy can be recommended for patients with the following conditions or symptoms:

• Inexplicable symptoms pertaining to a lung problem, especially when non-invasive diagnostic procedures (such as chest radiographies) have failed to yield any conclusive information
• Suspected lung cancer
• Suspected lymphoma, including Hodgkin’s disease
• Certain lung infections, including tuberculosis
• Cancer affecting the structures within the mediastinum
• Infection or inflammation of the structures within the mediastinum
• Thymoma, or the development of a tumour affecting the thymus gland
• Sarcoidosis, which causes inflammation in the lungs, liver, and spleen

Patients who are about to undergo lung removal surgery (as treatment for cancer du poumon) typically undergo a mediastinoscopy to check the lymph nodes and determine their suitability for such an irreversible procedure. Doctors also use the vital information obtained from a procedure to develop a treatment plan for patients with lung cancer.

It is important to note that a mediastinoscopy—while considered a surgical procedure because of the incisions involved—is performed only for diagnostic purposes and is not meant to deliver treatment to the structures within the mediastinum.

Comment se déroule la procédure ?

Mediastinoscopy is often performed in a hospital or clinic on an outpatient basis. Before the procedure, the patient is advised to:

• Stop the intake of certain medications that could affect the results of the procedure
• Fast for eight hours before the procedure
• Make arrangements for someone to bring him or her home after the procedure

The patient is then instructed to lie down on an operating table. An IV (intravenous) line is placed in the patient’s hand or arm, where general anaesthesia and fluids will be introduced to his or her system during the procedure. For the entire mediastinoscopy, the patient will be asleep and not feel pain.

A breathing tube is inserted into the throat and hooked up to a breathing machine or ventilator. The patient’s heart rate, blood pressure, and breathing are monitored during the entire procedure.

In male patients, chest hair is often trimmed to expose the skin.

The surgeon then makes a small incision right above the breastbone where a clean gloved finger is inserted to make a passageway into the mediastinum. Through this, the surgeon can examine the lymph nodes through touch.

The mediastinoscope is inserted into the incision to take images of the structures within the mediastinum as well as tissue and blood samples when and as needed. The mediastinoscope is then removed and the incision closed with sutures or adhesive strips. A sterile dressing will be placed in the area.

The samples taken from within the mediastinum are sent to a laboratory for further evaluation. The breathing tube and IV line are then removed.

Risques et complications possibles

Because a mediastinoscopy is a surgical procedure, it comes with certain risks, which include the following:

• Saignement excessif
• Infection within the mediastinum or on the site of the incision
• Temporary or permanent paralysis of the laryngeal nerve, which can cause voice hoarseness
• Presence of air in the space between the pleural space (which covers the lungs), which can then cause the lungs to collapse
• Sous-cutané emphysème, or air trapped under the skin

• Perforation of the oesophagus and trachea
  
  Les références:

• Chernecky CC, Berger BJ (2013). Laboratory Tests and Diagnostic Procedures, 6th ed. St. Louis: Saunders.

• Fischbach F, Dunning MB III (2015). A Manual of Laboratory and Diagnostic Tests, 9th ed. Philadelphia: Wolters Kluwer Health.

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**Question: What is Mediastinoscopy?**



**Answer:**



Mediastinoscopy is ‍a minimally invasive surgical procedure that allows doctors to visualize and obtain tissue samples ⁤from the mediastinum, the area between the lungs. It is commonly ‍used to evaluate and diagnose a variety of conditions, such as cancer, infections, and masses.



**Benefits⁢ of Mediastinoscopy:**



* **Minimal invasiveness:** Compared to open surgery, mediastinoscopy is less invasive, reducing​ the risk of complications and​ pain.

* ‌**Accurate diagnosis:** It enables doctors to​ obtain precise⁣ tissue samples for pathological examination, leading to a more accurate diagnosis.

* **Staging of diseases:** Mediastinoscopy helps determine the extent and stage of certain diseases, aiding in treatment planning.

* **Treatment monitoring:** In some ‌cases, mediastinoscopy can be used to monitor the response of a patient to treatment.



**Expected Results of⁢ Mediastinoscopy:**



The expected results of a mediastinoscopy procedure may vary based on the ‍underlying condition and the individual patient’s situation:



* **Diagnosis:** If performed for diagnostic purposes, mediastinoscopy aims to confirm ‍or rule out specific diseases or conditions.

* **Tissue samples:** The procedure ‍allows for the collection of tissue​ samples,⁣ which are then sent for pathological examination to determine ⁤the presence or absence of abnormal cells.

* **Staging of diseases:** Mediastinoscopy can help determine the stage of certain diseases,‌ such as cancer, by evaluating the extent of spread.

* **Treatment guidance:** The results⁤ of the procedure may guide further treatment decisions, such as surgery, chemotherapy, or radiation therapy.



**Potential Risks and ⁢Complications of Mediastinoscopy:**



Although generally safe, there are potential risks and complications associated with mediastinoscopy:



* **Bleeding:** There is a slight risk of bleeding⁣ during the procedure.

* **Infection:** Infection at the incision site is a potential complication.

* **Damage to structures:** The procedure may rarely cause injury to nearby structures, such as nerves or blood vessels.

* **Complications from anesthesia:** General anesthesia carries some risks, which are discussed with the patient before the procedure.



**Conclusion:**



Mediastinoscopy is a valuable⁢ diagnostic tool for evaluating conditions in the mediastinum. Its minimally invasive nature ⁢and ability to provide ​precise tissue samples make ⁣it beneficial for diagnosing and staging various diseases. Expected results ⁣include ‍accurate diagnosis, staging information, and guidance for further treatment. However, it’s important to discuss the potential risks and complications with the​ medical team​ before undergoing the procedure.