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Inguinal Nerve Block

If you have a private operation planned, it may involve an anaesthetic procedure, in this instance an Inguinal nerve block. You may wish to know what this involves.
 
The information here is a guide to common medical practice. Each hospital and doctor will have slightly different ways of doing things, so you should follow their guidance where it is different from the information given here. Because all patients, conditions and treatments vary it cannot cover everything. Use this information when making your treatment choices with your doctors. You should mention any worries you have. Remember that you can ask for more information at any time.

 

 

What is the problem?

You have a condition that requires an operation on your groin or lower tummy (abdomen). An inguinal nerve block can be used to give pain relief for these operations.

Inguinal nerve block

What is an inguinal nerve block?

An inguinal nerve block is an injection of local anaesthetic into the lower tummy, which numbs the nerves that go to the groin. This is one of many types of nerve block. This particular nerve block is usually used as part of an anaesthetic for an operation on the groin or lower abdomen. 

 

The nerve block may be used with a general anaesthetic, in which case you will be asleep for the nerve block. If the block is instead of a general anaesthetic you will be awake or sedated (sleepy).

 

The block usually lasts for several hours. One advantage of the block is that it reduces the amount of other strong painkillers, such as morphine, needed during and after the operation.

 

The aims

The aim is that you feel no pain during the operation. The block will provide pain relief during the operation and for several hours afterwards. Your anaesthetist will talk to you before doing the block and explain whether you will be awake, asleep or sedated during the operation. 

 

The benefits

There are a number of benefits. You may have other serious medical conditions, such as heart or lung disease. In this case a general anaesthetic may have slightly more risk than normal. Having the block, instead of a general anaesthetic, will cause less stress to your medical condition and be safer.

 

It is more common to perform an inguinal nerve block with a general anaesthetic. This gives excellent pain relief both during and after surgery. This means that the anaesthetist does not need to give as much anaesthetic or strong painkillers. This means a faster recovery and less sickness after the operation.

 

Are there any alternatives?

There are several alternatives to an inguinal nerve block. These are all listed below. The problem is that they all have additional risks involved. It may not be reasonable to expose you to these risks. For example, it is not reasonable to have a full general anaesthetic to remove a small skin tag. This is a tiny flap of skin less than a fingernail in size. This should be easy to do with local anaesthetic and sedation.

 

  • General anaesthetic: You can have your general anaesthetic, where you are completely asleep throughout, but without the inguinal nerve block. Other strong painkillers, such as morphine, can be given to keep you comfortable when you wake up.

  • Epidural: It may be possible to perform an epidural where the lower part of the body goes numb and is pain free. This involves placing a plastic tube next to the nerves in the spine, so that drugs can be injected, making the nerves stop working temporarily. This is a higher risk procedure for a small operation in the groin, for instance.  

  • Spinal: Alternatively a single injection, like an epidural, but without putting the plastic tube in, can be used. This single injection is called a spinal. It does not last as long as an epidural. This is also a more risky procedure for a small operation. 

  • Local anaesthetic: Sometimes, if the surgery is minor, local anaesthetic injections can be used to numb the operation area only.

 

If you are to have one of these procedures there is another information leaflet that will tell you more about it.

 

Who should have it done?

Patients needing surgery on the groin or lower abdomen can have this type of anaesthetic for their operation.

 

Who should not have it done?

Each patient has the final decision to proceed or not. If you are unhappy about the procedure for any reason, you should not continue. There are specific medical situations when an inguinal nerve block should not be done and they are as follows:

 

  • Medication that prevents your blood from clotting, such as Warfarin; this would lead to more bleeding than normal. Bleeding around the nerves in the groin is a serious problem and must be avoided.

  • An illness that prevents your blood from clotting, such as haemophilia; this would lead to more bleeding around the nerves in the groin.

  • Infection of the skin over the site where the needle needs to be put in; this could lead to further infection in the deeper tissues and possibly blood poisoning. This could also cause infection around the nerves.

  • Unusual or difficult anatomy; this would make it difficult to put the needle in the correct place.

  • Previous injury or disease affecting the groin area. Perhaps you have had a previous injury to your lower abdomen or pelvis.

 

Author: Dr Sean White FRCA. Consultant in pain and anaesthesia

© Dumas Ltd 2006

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