A nerve block is a powerful tool for your safety and comfort during surgery and recovery. I perform nerve blocks nearly everyday for my patients. Here is what you need to know about nerve blocks for your surgery and anesthesia.
What is a nerve block, Dr. Kaveh?
A nerve block is an injection of local anesthetic (like lidocaine) around a nerve. This blocks sensation of the skin, muscle, and bone. It makes you numb in the area you're having surgery. It's similar to what you have at the dentist's office. This helps reduce pain after surgery. In fact, many patients will feel no pain at all after their surgery, depending on their surgery and type of nerve block.
Depending on the surgery, many patients feel little, if any, pain after a nerve block.
Why do you get a nerve block?
A nerve block can address several major fears around surgery:
Pain is worst in the first 24 hours after surgery. Nerve blocks can significantly reduce the pain during this intense time after surgery. By reducing the pain, you also need less pain medication. Taking fewer pain medications reduces your risks for nausea, vomiting, constipation, and addiction.
Reducing opioid use after surgery is very important. It only takes 5 days of opioid pain medication use to put you at risk for addiction after surgery. This is another reason why nerve blocks increase safety after surgery.
Other benefits of nerve blocks include:
Nerve blocks can reduce pain, nausea, addiction, complications, and medication side effects. This can be incredibly empowering for patients.
Where do you inject the nerve block?
The nerve block injection site depends on where you're having surgery. It also depends on your health, and the surgeon and anesthesiologist's joint decision.
Some common nerve block injections are around the shoulder, abdomen, and knee. It all depends on where your surgery is.
How long will I stay numb?
You will stay numb until the medication is cleared by the body. This depends on where you were injected and the type of medication used.
Most patients are numb for 8-24 hours. Some nerve block medications can last up to 72 hours.
Muscle weakness with nerve blocks
If you are being blocked in your arm or leg, you may have difficulty controlling your limb. This is because the injection blocks nerves for both sensation and motor function. Patients describe the sensation as a "dead weight". Don't be concerned though, you will regain function of the limb once the medication wears off!
Are nerve blocks safe?
Your anesthesiologist and surgeon want you to be safe and comfortable during your surgery and recovery. Nerve blocks allow for both. My patients are sometimes concerned about long-term nerve damage from the nerve block injection. Fortunately, this is very rare, occurring in about 0.22% of patients.
This risk needs to be balanced with the risks of not having a nerve block. If you don't have a nerve block, you will likely have general anesthesia (see my upcoming article) and take opioid pain medications. Remember, opioid pain medications have their own risks after surgery.
The decision for a nerve block depends on many patient and surgical factors. I recommend you discuss the risks and benefits of a nerve block with your anesthesiologist before surgery. This will help give you the best outcome from your surgery and recovery. By learning about your anesthesia you're taking a powerful step in taking control of your surgery!
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Abdallah et al. Will the Real Benefits of Single-Shot Interscalene Block Please Stand Up? A Systematic Review and Meta-Analysis, Anesthesia & Analgesia: May 2015 - Volume 120 - Issue 5 - p 1114-1129
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