Malignant pleural effusion

Malignant pleural effusion (Malignant pleural effusion)

1) Disease description (causes and symptoms)

• Definition and pathophysiology: A condition in which fluid abnormally accumulates in the pleural cavity (between the lungs and chest wall). Malignant pleural effusion occurs mainly when cancer cells infiltrate the pleura due to primary or metastatic cancer, or when fluid production increases or absorption decreases due to tumor-related inflammation, lymphatic obstruction, and other causes. It usually appears when cancer is advanced and has an important impact on treatment and prognosis.
• Main causes: Pleural metastasis from various solid or hematologic cancers, including lung cancer (especially metastatic or advanced cancer), breast cancer, and lymphoma.
• Main symptoms: Shortness of breath (worsening during exercise or at rest), persistent dry cough, chest pain (especially pleuritic chest pain), anxiety and discomfort, and, rarely, accompanying fever or weight loss.

2) Treatment methods and precautions

• Diagnostic and therapeutic thoracentesis (Thoracentesis)
  • Diagnostic purpose: After collecting pleural fluid, cytology, biochemical testing (differentiating exudate/transudate according to Light's criteria), culture, and other tests are performed.
  • Therapeutic purpose: To relieve symptoms (improve shortness of breath). There is a possibility of some recurrence after the procedure.
• Chest tube insertion and outpatient or inpatient drainage
  • Continuous drainage through a chest tube in cases of large-volume or recurrent pleural effusion.
• Pleurodesis (Pleurodesis)
  • The pleural cavity is closed through chemical pleurodesis (mainly using talc, etc.) or surgical pleurodesis to reduce recurrence.
  • Indications: When the lung is sufficiently expanded and the patient's general condition allows them to tolerate the procedure.
• Indwelling pleural catheter (Indwelling pleural catheter, IPC)
  • Allows drainage at home for patients who frequently experience recurrent symptoms and can help improve quality of life.
• Systemic treatment for the primary cancer
  • Medical oncology treatments (chemotherapy, targeted therapy, immunotherapy, etc.) affect the development and recurrence of pleural effusion. When possible, treatment of the causative cancer should be provided concurrently.
• Radiation therapy
  • May be used to relieve local symptoms (pain and local symptoms caused by the tumor).
• Conservative and supportive management of pain and shortness of breath
  • Oxygen therapy, analgesics, anxiety relief (anxiolytics and counseling), respiratory rehabilitation (breathing techniques and positioning), etc.
• Precautions and complications
  • There is a possibility of pneumothorax, bleeding, infection, and re-expansion pulmonary edema after thoracentesis.
  • If hemodynamic changes or symptoms occur during large-volume drainage, stop immediately and report them to the medical staff.
  • The patient's general condition (bleeding tendency, use of anticoagulants, etc.) must be reported before the procedure.
• Prognosis
  • In general, malignant pleural effusion suggests progression of cancer, so the prognosis is often limited. Therefore, the treatment goals are often symptom relief and improvement of quality of life.

3) Outpatient visit checklist (items and records to prepare and bring)

• Items/materials
  • A list of currently used medications (including prescription drugs, over-the-counter medicines, and supplements), including the medication name, dosage, and time of administration
  • Copies of previous medical certificates/surgical records and recent test results (chest X-ray, chest CT, blood tests, etc.), if possible
  • Record of symptom changes: when shortness of breath began, triggering factors (exercise or rest), progression of worsening, and the characteristics and frequency of cough and pain
  • Information regarding allergies and bleeding tendency (for example, whether anticoagulants are being taken)
• Things that may be measured during the outpatient visit: body temperature, pulse, blood pressure, oxygen saturation (SpO2), auscultation, etc.

Example questions (to check yourself when visiting the hospital)

• How has my shortness of breath changed over the past few weeks? (For example, worsening from during exercise to at rest)
• What are the location, intensity, and progression over time of my chest pain?
• Are there systemic symptoms such as fever, weight loss, or night sweats?

4) Examples of general questions to ask the doctor

• What do you think is the cause of this pleural effusion? What additional tests are needed for diagnosis?
• What are the risks and expected benefits of thoracentesis (or chest tube insertion)?
• If cancer cells are not detected in the pleural fluid test, what is the next step (additional testing or pleural biopsy)?
• To what extent could treatment for the primary cancer (chemotherapy, targeted therapy, or immunotherapy) help reduce the pleural effusion?
• In what situations should I go directly to the emergency room? (Acute shortness of breath, worsening chest pain, bleeding, etc.)

5) Examples of disease-specific questions

• If malignancy is confirmed by pleural fluid testing, which future pleural treatment—pleurodesis or an indwelling pleural catheter—would be more appropriate for me? What is the reason?
• If the pleural effusion rapidly recurs after thoracentesis, would you recommend pleurodesis as the next step, or would you recommend systemic treatment for the primary cancer first? What criteria are used to make this decision?

Additional precautions

• If shortness of breath suddenly becomes severe or chest pain suddenly worsens, visit the emergency room immediately.
• Be sure to inform the medical staff before the procedure whether you are taking anticoagulants or have a risk of bleeding.

(This document is intended to provide clinical explanations and general recommendations. Treatment decisions for individual patients should be discussed with the treating specialist.)