Elbow Block - Types, Procedure, and Risks

Introduction

Pain is a prevalent symptom expressed by the patient. However, pain during or after surgery can make the doctor go for nerve blocks. Nerve blocks of the arm can inhibit the pains of the arms or elbow. This topic explains elbow blocks, their different nerve blocks, their indications, procedure, and risks.

What Are Elbow Blocks?

Elbows have nerve supplies that provide signals from the site to the brain. The procedure to block the nerve and numb the elbow and wrist area is called elbow blocks. An anesthetic agent is used to block the nerves in the elbow. An anesthetic agent is delivered by injection.

Why Are Elbow Blocks Required?

Elbow blocks are required in cases of elbow surgery. Elbow blocks are given for surgery or post-surgery pain relief purposes. After the surgery, the doctor can use elbow nerve blocks to control the pain in the surgical area. Instead of general anesthesia, the doctor can use these blocks.

What Are the Different Types of Nerves Supplying the Elbow?

Elbows have three main nerve supplies. All three nerves start from the shoulder and move down across the elbow. The three primary nerves of the elbow are:

• Radial Nerve - The radial nerve has branches that provide nerve supply to the arm. It has fibers from the spinal nerves. It supplies the triceps muscles of the arm, wrist, and hand muscles. It provides sensory fibers to the back of the hand except for the little finger and half of the ring finger.

• Ulnar Nerve - The ulnar nerve runs near ulna bone. The ulnar nerve supplies the little finger, the half of the ring finger, the palm, and the front and back of tips.

• Medial Nerve - The medial nerve supplies the skin of the palmar, side of the index finger, thumb, middle finger, ring finger, and nail bed.

What Are the Different Blocks in the Elbow?

As there are three primary nerve supplies of the elbow. There are three nerve blocks in the elbow. The blocks are:

• Radial nerve block.

• Ulnar nerve block.

• Medial nerve block.

What Are the Indications for Elbow Blocks?

Indications of elbow blocks are:

• In cases where complete hand anesthesia is required for surgical procedures.

• To avoid general anesthesia in the patient.

• Elbow surgery.

• For suturing.

• Removal of foreign body from the palm.

• For treating finger fractures.

What Is the Procedure for an Elbow Block?

The three nerve blocks are blocked with three injections on different sites on the forearm. The procedure for nerve blocks is:

Radial Nerve Block

• The patient is relaxed initially.

• The patient is made to sit or lay down on the bed.

• The site of needle insertion is cleaned with an antiseptic solution.

• The brachioradialis muscle covers the radial nerve.

• With the help of ultrasound guidance, the doctor identifies the nerve below the brachioradialis muscle in the arm.

• Local anesthesia in the form of cream or gel is used over the area.

• The doctor places the needle lateral to the brachioradialis muscle adjacent to the superficial radial nerve.

• After checking the path with no blood vessels, the doctor injects local anesthesia near the radial nerve.

• The needle is removed after the injection.

• And a bandage is placed over it.

Ulnar Nerve Block

• The patient is relaxed.

• The patient is made to hold his palm upwards and flex his wrist.

• The area is cleaned with an antiseptic solution.

• The ulnar nerve runs under the flexor carpi ulnaris tendon.

• The doctor identifies the flexor carpi ulnaris tendon on the wrist by ultrasound guidance.

• The doctor used local anesthesia as gel or cream over the skin to inhibit pain while piercing the needle.

• The doctor places the hand over the proximal wrist.

• The needle is aspirated to ensure that there is no blood vessel present.

• After the negative aspiration, local anesthesia is injected.

• It takes ten minutes to block the ulnar nerve.

Medial Nerve Block

• The patient is relaxed.

• The patient is made to lie palm-held upwards and slightly flexed.

• The wrist is cleaned with an antiseptic solution.

• Apply local anesthesia gel to inhibit pain on needle piercing.

• The needle is inserted proximal to the wrist on the ulnar side of the flexor carpi tendon.

• After aspiration, the needle slowly injects local anesthetic into the area.

• Almost ten minutes are required to block the site, but if it is still a sensation that appears, then repeat injections are performed.

What Are the Risks Related to the Elbow Block?

Risks related to elbow blocks are:

• Pain at the injection site.

• Bruising.

• Bleeding.

• Swelling.

• Sometimes, blocks might not work at once.

• Nerve injury.

• Paresthesia.

• Local anesthesia toxicity.

How Long Does Elbow Block Effect?

The duration of the elbow block effect depends upon the kind and quantity of the anesthetic agent used to block the nerve signals. For example, the anesthesia effects can last for five hours, whereas the analgesic effect can last for longer even.

What Are Anesthetic Agents Used in Elbow Block?

The anesthetic agents used are:

• Lidocaine - It is used for three to eight hours use.

• Bupivacaine - It is used in cases for long-term effects. It can block for about five to 30 hours.

• Mepivacaine - It is used in patients for short-term results.

• Ropivacaine - It is used for long-term results.

What to Expect After the Elbow Blocks?

After the elbow block is delivered, the anesthesia starts showing its effect for nearly ten minutes. First, the patient may feel a tingling sensation over the arm. And soon after the tingling sensation, numbness is experienced.

What Are the Important Facts About the Elbow Block?

Important facts are:

• The doctor should have informed consent from the patient.

• Elbow blocks allow the patients to be conscious during the surgeries.

• Use of local anesthetic gel before needle use.

• Aspiration before injecting the anesthetic is important to check the vessel affected by needle injection.

• The doctor should deliver the injection slowly.

What Are the Precautions Taken After the Elbow Blocks?

The precautions are:

• Protecting the arm after the block from injury is important as the movements cannot be controlled.

• Wear the arm sling to keep the arm in the proper position for at least 24 hours.

• Due to heaviness in the arm being injected, the patient can fall due to imbalance.

• Protect the arm from the hot and cold temperature as the sense of hot and cold is lost.

Conclusion

The elbow blocks are delivered to inhibit the pain during the surgical procedure or for post-surgical analgesia. The elbow blocks have three main nerve blocks the radial, the ulnar, and the medial nerve. The three nerve blocks require different approaches to anesthesia in the area over the elbow. The procedure, indications, and risks of the elbow block are mentioned in the above article.