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ANAESTHETICS



ANAESTHETIC DEPARTMENT

PATIENT INFORMATION ABOUT ANAESTHETICS FOR OPERATIONS
ON THE LEG (INCLUDING HIP AND KNEE REPLACEMENTS)

Please read this information carefully.
It is important that you take note of any instructions or advice given.

Introduction
This leaflet aims to give you some information about the anaesthetic and pain relief you may receive when you come into Harrogate District Hospital for surgery on your leg. An anaesthetist will come to see you before your operation and discuss your anaesthetic with you. This is a good time to ask any questions and discuss any worries you may have. Additionally, you may like to visit www.youranaesthetic.info , where you will find a number of leaflets from the Royal College of Anaesthetists which may also be helpful.


Anaesthetic Types
There are 3 main types of anaesthetic performed at Harrogate District Hospital. They are:
    - 1) A General Anaesthetic
    - 2) A Spinal Anaesthetic
    - 3) A Nerve Block
Sometimes you may receive a combination of these.

1) A General Anaesthetic
If you have a general anaesthetic, you will be asleep throughout your operation. You will be given drugs to keep you asleep and also strong pain killers. A general anaesthetic can be used for any length of operation – from a few minutes to many hours. When the operation is finished, you will wake after about 5-10 minutes, although your may not remember much for the first half hour.

Advantages:
- You are completely unaware of anything at all during the operation.

Disadvantages and Side Effects:
- The anaesthetic itself does not provide any pain relief for after the operation. You will therefore need strong painkillers. These sometimes make people feel sick or drowsy.

- Many people develop a sore throat and dry mouth for a few hours after the operation

- Sometimes you can feel or even be sick. This is more common if you have suffered from it before, so please tell your anaesthetist if it has been a problem. There are medicines available to treat sickness should it occur.

- Older people may become confused and forgetful, but this is usually temporary

- Although uncommon, it is possible to damage your lips, gums or teeth (particularly caps, crowns and bridgework)

2) A Spinal Anaesthetic
A very fine needle is used to inject local anaesthetic around the nerves at the base of your back. This will make you go numb from about the tummy-button downwards. Your legs will go very heavy (in fact you may not be able to move them at all for a few hours).

Advantages:
- You will need less strong pain killers in the first few hours after the operation

- You are less likely to be sick or drowsy. This means you should be able to eat and drink much sooner

- You can be given sedation during the operation, which means that you do not see or hear things if you do not wish to! Some people like to listen to music through headphones, whilst others just catch up on some sleep

- You are less likely to suffer a blood clot in your legs or your lungs

- There may be less bleeding, and you may be less likely to need a blood transfusion

- If you suffer from any chest diseases you may have fewer problems with your breathing

Disadvantages and Complications:
- Sometimes it is not possible to perform the injection, particularly if you have any problems with the bones in your back

- Occasionally your legs do not go numb enough. If this happens, either the injection can be repeated or you can have a general anaesthetic as well

- The needle may leave a small bruise on your back, which may be slightly sore for a few days. It does not cause long term back ache

- There is a small chance of developing a headache afterwards (less than 1 in 100 patients suffer from this).

- Whenever a needle is put into any part of your body, no matter how much care has been taken, a few things can happen by accident such as letting in infection or causing bleeding. It is also possible to damage a nerve. This is so rare that it is not possible to give an accurate chance of it happening. It is estimated to be between 1 in 5,000 and 1 in 30,000.

3) A Nerve Block
This involves injecting local anaesthetic around one or more of the nerves in the leg. This is sometimes performed with you awake, although it may also be done after you have had some sedation or under general anaesthetic. After the operation, your leg may feel numb and heavy for some hours afterwards.

Advantages:
- The block should provide pain relief for a number of hours afterwards

- Because you need less strong painkillers, you may feel less drowsy and sick. If you have a general anaesthetic too, this is often “lighter”, so again you may feel less drowsy.

- Only the leg which has been operated on feels numb (unlike a spinal anaesthetic, which affects both legs)

Disadvantages and Complications:
- Sometimes the block does not work as well as expected. If this happens, you will still be given enough painkillers to make you comfortable

- Occasionally the numbness in your leg can last around 24 hours. This may mean you have to stay in bed after your operation for a short time

- Very occasionally, the nerve may be bruised or damaged. This is sometimes due to the needle itself, but may also be due to infection, bleeding around the nerve, poor blood supply to the leg, the position of your leg during the surgery or sometimes the operation itself. Symptoms such as numbness, pins-and-needles, pain or weakness lasting up to a week are seen after between 1 and 5 out of every 100 nerve blocks (1-5%). Around 95% of these fully recover within 4-6 weeks, and 99% have recovered within a year. Permanent nerve damage is so rare that precise numbers are not available. One estimate is that it might happen in between 1 in 5000 and 1 in 30,000 nerve blocks.


All Types of Anaesthetic share a number of Potential Complications
- After the operation, some people have difficulty in passing water. This is more common in men and more likely after a spinal anaesthetic. It may require treatment by passing a small tube into the bladder for a day or so.

- Heart attacks and strokes are uncommon after anaesthetics. The risks of these happening are related to your general health and fitness. If you are felt to be high risk, it will be discussed with you by your anaesthetist

- You will be given a number of different medicines during your stay. It is very important that you tell your anaesthetist if you have any allergies. It is of course possible that you could have an allergy for the first time during your stay.


Pain Relief after your Leg Surgery
It is very important that you are comfortable after your surgery, as you will need to begin exercising your leg as soon as possible. If you are in pain, do not hesitate to tell the ward staff. They will either give you additional pain killers or ensure your medication is changed. Remember everyone’s pain is different – some people need more painkillers, and some will need less.

A number of methods are used in Harrogate which supplement any painkillers you received with your anaesthetic.

1) Paracetamol
Paracetamol is a very widely used painkiller. It is usually given by mouth and has very few side effects. When given regularly, it can reduce the amount of stronger painkillers required.

2) Anti-inflammatory Painkillers (NSAIDs)
These include drugs such as ibuprofen (Brufen), diclofenac (Voltarol), celecoxib (Celebrex) and aspirin. Like paracetamol, they too can reduce the amount of stronger painkillers you may need. However, they are not suitable for all patients. They can irritate your stomach, and occasionally affect how your kidneys work. A small number of patients with asthma sometimes find they become wheezy if they take NSAIDs. Therefore they are generally used only in a selected group of patients.

3) “Strong” Pain Killers
These range from the milder drugs such as codeine and tramadol, up to the stronger drugs pethidine and morphine. They can usually be given by mouth or as an injection. We can also give you morphine using a PCA (see below). Although they are excellent painkillers, they may cause some side effects. Some patients develop a very dry mouth, feel sick or dizzy, and in high doses they can make you feel drowsy. They can also cause constipation. Sometimes if you get side effects from one drug, we can try a different one.

4) PCA (Patient Controlled Analgesia)
This is one commonly used way to give you morphine, usually only for the first day or so after your operation. We connect a small machine to the plastic drip in your arm. You are given a button to press every time you feel pain. When pressed, a small amount of morphine goes straight into your blood. It will start to work within minutes. You can use it as much or as little as you need. Do not worry about getting an overdose – the machine will only allow one dose every few minutes. If you are using it too much, you will become sleepy and therefore unable to press the button anymore. It is vital that you are the only person to press the button -don’t hand it to a relative to press for you!

Many patients are worried about using strong painkillers in case they become addicted. If you use them when you have pain, you will not become addicted.

We hope to make your forthcoming visit to Harrogate District Hospital as comfortable as possible. Please remember that if you do have any questions or concerns, your anaesthetist will be very happy to discuss them with you.

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