Pericardiocentesis is a procedure that uses a needle to remove fluid from the pericardial sac. This is the tissue that surrounds the heart.
Pericardial tap; Percutaneous pericardiocentesis
How the Test is Performed
The procedure is most often done in a special procedure room, such as a cardiac catheterization laboratory. It may also be done at a patient's hospital bedside. A health care provider will put an IV into your arm in case fluids or medicines need to be given through a vein. For example, you may be given medicines if your heartbeat slows or your blood pressure drops during the procedure.
The health care provider will clean an area just below the breastbone or below the left nipple. Numbing medicine (anesthetic) will be applied to the area.
The doctor will then insert a needle and guide it into tissue that surrounds the heart. Often, echocardiography is used to help the doctor see the needle and any fluid drainage. An electrocardiogram (ECG) and x-rays (fluoroscopy) may also be used to help with positioning.
Once the needle has reached the correct area, it is removed and replaced with a tube called a catheter. Fluid drains through this tube into containers. Most of the time, the pericardial catheter is left in place so draining may continue for several hours.
Surgical drainage may be needed if the problem is hard to correct or comes back. This is a more invasive procedure in which the pericardium is drained into the peritoneal (abdominal) cavity. This may need to be done when you are under general anesthesia.
How to Prepare for the Test
You may not be able to eat or drink for 6 hours before the test. You must sign a consent form.
How the Test will Feel
You may feel pressure as the needle enters. Some people have chest pain, which may require pain medicine.
Why the Test is Performed
This test may be done to remove and examine fluid that is pressing on the heart. It is most often done to find the cause of a chronic or recurrent pericardial effusion.
It may also be done to treat cardiac tamponade, which is a life-threatening condition.
There is normally a small amount of clear, straw-colored fluid in the pericardial space.
What Abnormal Results Mean
Abnormal findings may indicate the cause of pericardial fluid accumulation, such as:
Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.