Fluid can sometimes collect in the space between the lungs and the chest wall. Doctors call this condition pleural effusion. A small amount of fluid normally exists in this space. However, excessive fluid can press against the lung and make breathing difficult.
Thoracentesis provides a way to remove some of this fluid. Doctors can also send the collected fluid for laboratory testing. Therefore, the procedure can help relieve symptoms and investigate the cause of pleural effusion.
If you have been advised to undergo a thoracentesis procedure, understanding the process can help you feel more prepared.
What Is Thoracentesis?
Thoracentesis is a medical procedure that removes excess fluid from the pleural space.
Doctors may also call it a pleural tap. During the procedure, a healthcare professional uses a needle or catheter to access the pleural space through the chest wall.
The doctor then removes a controlled amount of fluid.
Thoracentesis can serve two main purposes. First, it can relieve pressure caused by excess fluid. Second, it can provide a fluid sample for laboratory analysis.
Therefore, the procedure can offer both therapeutic and diagnostic benefits.
What Causes Fluid Around the Lungs?
Several medical conditions can cause fluid to collect around the lungs.
Common causes include:
- Heart failure
- Pneumonia
- Tuberculosis
- Cancer
- Kidney disease
- Liver disease
- Autoimmune disorders
- Pulmonary embolism
- Other inflammatory conditions
Because many conditions can cause pleural effusion, doctors need to identify the underlying cause.
For example, a patient with pneumonia may develop an infected pleural effusion. On the other hand, another patient may develop fluid because of heart failure.
Consequently, doctors may recommend different investigations depending on the patient’s symptoms and medical history.
What Symptoms Can Pleural Effusion Cause?
A small pleural effusion may cause few or no symptoms.
However, larger amounts of fluid can produce noticeable breathing problems.
Possible symptoms include:
- Shortness of breath
- Chest discomfort
- Chest heaviness
- Dry cough
- Difficulty taking a deep breath
- Reduced exercise tolerance
- Pain that worsens with deep breathing in some cases
Symptoms can vary significantly from one person to another.
Therefore, persistent breathing difficulties require proper medical assessment rather than self-treatment.
Why Do Doctors Perform Lung Fluid Removal?
Doctors may recommend lung fluid removal when the fluid causes significant symptoms or when they need to investigate its cause.
When fluid presses against the lung, removing some of it may allow the lung to expand more effectively.
As a result, some patients experience improved breathing after the procedure.
Additionally, doctors can analyze the removed fluid. Laboratory testing can provide important information about infection, inflammation, malignancy, and other possible causes.
Therefore, thoracentesis can help answer an important question – why has fluid accumulated around the lung?
What Is a Pleural Tap?
A pleural tap is another common name for thoracentesis.
The terms describe the same basic procedure. The doctor carefully inserts a needle or catheter through the chest wall and into the pleural space.
The doctor then removes fluid for treatment or testing.
Although the procedure may sound complicated, medical teams use careful techniques to reduce risks and improve patient comfort.
How Do Doctors Prepare for Thoracentesis?
Before the procedure, the doctor reviews your medical history.
Tell your doctor about:
- All medicines you take
- Blood-thinning medicines
- Medication allergies
- Previous bleeding problems
- Previous chest procedures
- Heart or lung conditions
- Any current infection or fever
Your doctor may also review recent chest X-rays, ultrasound images, or CT scans.
In addition, the medical team may use ultrasound to locate the fluid and select an appropriate site for the procedure.
Follow the specific instructions provided by your healthcare team. Also, do not stop prescribed medication unless your doctor advises you to do so.
What Happens During the Thoracentesis Procedure?
The patient usually sits in a comfortable position. The medical team then cleans the skin over the procedure site.
Next, the doctor uses a local anesthetic to numb the area. You may feel a brief sting from the anesthetic injection.
Once the area becomes numb, the doctor carefully guides a needle or catheter into the pleural space.
The doctor then removes fluid gradually.
During the procedure, the medical team monitors your condition. They may check your breathing, oxygen level, blood pressure, and pulse.
The doctor may collect a fluid sample for laboratory testing.
After removing the required amount of fluid, the doctor removes the needle or catheter and covers the site.
Does Thoracentesis Hurt?
Most patients tolerate thoracentesis well.
The local anesthetic reduces pain during the procedure. You may feel pressure or mild discomfort as the doctor performs the pleural tap.
Afterward, the area may remain slightly sore.
Tell the medical team if you experience significant pain, severe discomfort, or breathing difficulty during or after the procedure.
What Happens to the Removed Fluid?
The doctor may send the fluid to a laboratory for analysis.
Laboratory testing can examine different characteristics of the fluid.
Doctors may assess:
- Protein levels
- Cell counts
- Signs of infection
- Abnormal cells
- Other chemical characteristics
These results can help distinguish between different causes of pleural effusion.
For example, doctors may investigate tuberculosis, bacterial infection, cancer, or inflammatory disease when the clinical situation suggests these possibilities.
Therefore, fluid analysis can play an important role in establishing the diagnosis.
What Happens After Thoracentesis?
After the procedure, the medical team monitors the patient for a period of time.
Doctors may perform imaging if they need to check the lung after fluid removal.
Most patients can resume normal activities according to their doctor’s instructions. However, your recovery may depend on your overall health and the reason for the procedure.
Keep the procedure site clean and follow any wound-care instructions.
Furthermore, report unusual symptoms promptly.
Possible Risks of Thoracentesis
Thoracentesis generally has a good safety profile when an appropriately trained medical team performs it. Nevertheless, complications can occur.
Possible risks include:
- Pain
- Bleeding
- Infection
- Air entering the pleural space
- Pneumothorax
- Breathing problems
- Rare injury to nearby structures
The risk varies according to the patient’s health and the complexity of the procedure.
Therefore, your doctor should explain the potential benefits and risks before proceeding.
When Should You Consult a Pulmonologist?
You should seek specialist evaluation if you develop unexplained breathlessness, recurrent pleural effusion, persistent chest discomfort, or abnormal chest imaging.
A pulmonologist can review your symptoms and investigations. Then, the specialist can determine whether you need additional testing, pleural fluid removal, or another treatment.
You should also seek medical attention if your breathing suddenly becomes much worse.
Similarly, severe chest pain, coughing up blood, fainting, or significant respiratory distress requires urgent medical evaluation.
Can Pleural Effusion Return After Thoracentesis?
Yes, pleural fluid can return after thoracentesis.
The procedure removes the existing fluid, but it does not always eliminate the underlying cause.
For example, heart failure may continue to produce fluid until doctors control the underlying condition.
Likewise, infection, tuberculosis, cancer, and inflammatory diseases may require specific treatment.
Therefore, treating the underlying cause remains an important part of long-term management.
Thoracentesis provides an effective way to remove excess fluid from around the lungs. The procedure can relieve pressure and improve breathing in selected patients. Moreover, doctors can analyze the collected fluid to investigate the cause of pleural effusion.
However, not every patient with fluid around the lungs needs thoracentesis. Your pulmonologist should assess your symptoms, imaging findings, medical history, and overall condition before recommending the procedure.
If you have unexplained fluid around the lungs or persistent breathing difficulties, timely specialist evaluation can help identify the cause and guide appropriate treatment.
Prof. Brig. (Retd.) Dr. Muhammad Imran
Pulmonologist & Chest Specialist
Lung Care Clinic
Shop #G-13, Kohistan Tower, Mahfooz Road, Military Hospital Rd, Opposite AFIC, Saddar, Rawalpindi0302-9664043
Serving patients from Rawalpindi and Islamabad.