Monday May 21 , 2012
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Fluoroscopy - Lumbar Puncture

Fluoroscopically Guided Lumbar Puncture Techniques

 

Procedure

1. The patient is placed prone on the table top, and

the skin of the midlumbar back is sterilized.

2. Using the lumbar approach, typically, the L2 to

L3 or L3 to L4 interlaminar or interspinous space

is localized under fluoroscopy. Subcutaneous

and intramuscular local anesthetic is

administered. A styletted spinal needle is

introduced through the anesthetized region and

directed toward the midline. The needle is

advanced under intermittent fluoroscopic control

in small increments. If a beveled needle is

utilized, the bevel may be used to control the

direction of the needle. When the subarachnoid

space is reached, a pop may (but not always) be

felt. The stylet is slowly removed to check for

cerebrospinal fluid return. Fluid may be slowly

withdrawn for laboratory studies if requested.

 

Lumbar Puncture Under Fluoroscopy

What is a lumbar puncture?

A lumbar puncture, also called a spinal tap, is a procedure in which the fluid surrounding the spinal cord (called the cerebrospinal fluid or CSF) is withdrawn through a needle and examined in a laboratory.

This procedure may be performed to:

Measure the pressure around the brain and spinal cord

Relieve pressure in the head

Give spinal anesthesia

Inject dye for an X-ray diagnostic test

Inject medications

There are seven cervical vertebrae in the neck, 12 thoracic vertebrae in the torso and 5 lumbar vertebrae in the lower back. The needle used in a lumbar puncture is usually inserted between the lumbar vertebrae.

The cerebrospinal fluid (CSF) circulates in the subarachnoid space of the spinal canal. It has many vital functions, including protecting the brain and spinal cord from injury. The CSF contains glucose (sugar), proteins and other substances that are also found in the blood. Testing the CSF can help in the diagnosis of disorders of the central nervous system that may involve the brain, spinal cord or their coverings (meninges).

Who performs the test?

The lumbar puncture procedure is performed by a physician trained in the use of X-ray equipment, called flouroscopic equipment, which allows the doctor to view the needle as it is placed into the subarachnoid space.

Notify your physician

Inform your physician of any medications you are currently taking, including non-prescription drugs. Also tell your physician if you are allergic to any medications.

NOTE: Do not discontinue any medication without consulting with your primary physician and/or physician requesting this study.

If you have any of the following conditions, please notify your physician:

Diabetes

Allergies to any drugs or foods

Are pregnant or think you may be

Before the test

A blood test or other laboratory tests may be ordered by your doctor prior to the test. Please follow these guidelines before the test:

Medications

Do NOT take dipyridamole (Persantine), clopidogrel (Plavix) or warfarin (Coumadin) within 72 hours prior to the test. These medications are often referred to as blood thinning pills.

Do NOT take aspirin or any products containing aspirin.

DO take your other medications as determined by your physician, especially any medications for high blood pressure.

Alcohol

Ask your doctor for specific guidelines regarding alcohol use before the test. Generally, you should not consume any alcohol for at least 24 hours prior to the test.

If you have diabetes

Take your usual dose of insulin and eat a light breakfast before 8:00 a.m.

When you arrive for your test, please be sure to remind the physician that you have diabetes.

Eating and drinking

You may eat a light breakfast the morning of the test.

On the day of your test

Please make arrangements for transportation, as you should not drive immediately after the test.

Please do not bring valuables such as jewelry or credit cards.

You will meet with the radiologist in the Department of Radiology, Desk Hb6. In addition to providing verbal consent, you will discuss:

Steps of the procedure and any questions you may have regarding the procedure.

Risks and benefits anticipated in your case.

During the test

The radiologist and technologist will be in the room with you.

Pre-medication, although rarely needed, may make you feel drowsy and relaxed.

You will wear a hospital gown during the examination.

You will either:

Lie on your side with your knees drawn as close to your chest as possible and your chin

toward your chest; or

Lie on your stomach with a small pillow beneath your lower abdomen.

Your back will be cleaned with an antiseptic and sterile cloths (called drapes) will be placed around the area.

A local anesthetic (pain-relieving medication) will be injected into the area on your back. You may feel a slight burning sensation.

When the area is numb, a hollow needle is inserted in the lower back between the two lumbar vertebrae. This sometimes causes pressure.

The spinal canal is penetrated, and fluid is collected or medication is injected. The spinal cord is not touched by the needle during the test.

You may feel some discomfort or have a minor headache.

The needle is removed after the medication has been injected or fluid is removed. The area will be cleaned with an antiseptic and covered with a small bandage.

You will lie on your back or stomach for about an hour.

A blood sample may be taken from a vein in your arm and tested, along with the spinal fluid, in the laboratory.

After the test

You will be monitored in Radiology Recovery for a few hours. At that time, the Radiology nurse will discuss post-procedure instructions with you. You will be provided with a written form of these instructions -- please follow these at home.

The results of your study will be discussed with your referring physician within 24 hours.

Please call the Division of Radiology at 216.444.6640 if you have any questions.

For the first 24 hours after the test

Remain flat on your back as much as possible.

Drink at least 2 1/2 quarts of fluid.

Notify the Division of Radiology if you experience any drainage from the puncture site, or headache.

References

 

 

 

Lumbar Puncture References: