What is the Mastoid?
The mastoid is the solid lump of bone just behind the ear. The air space of the middle ear, behind the eardrum, extends backwards into this area of bone.
Operations on the middle ear and mastoid (Mastoidectomy) are usually performed because of deep-seated infection, which will not settle with simple cleaning and antibiotics. This is usually because of an ingrowth of skin into the middle ear and is called a cholesteatoma. The ear usually feels wet or actually discharges. The eardrum will be abnormal, with a perforation or an infected pocket. The bones of the middle ear, which transmit sound into the inner ear, are often affected by the infection and this may result in hearing loss.
If the infection is left untreated the area of infected skin and underlying bone will tend to gradually enlarge and may cause complications. The hearing may worsen, there may be dizziness, the nerve that goes to the muscles in the face can be damaged and produce weakness of the face, and the infection can spread to the brain. These potentially serious complications are rare but have to be considered, especially if the ear is left untreated for years.
The main aim of surgery to the mastoid is to make the ear safe by removing the infected tissue. At the end of the operation, there may be what is called a ‘mastoid cavity’ (an enlargement of the inside of the ear canal), just above and behind the site of the eardrum which, it is hoped, will line itself with skin and become self-cleansing in the future.
What is a Meatoplasty?
The aim of this operation is to enlarge the opening in the ear canal leading to the mastoid cavity. This allows fresh air into the cavity and helps to keep it dry, and makes it easier for the E.N.T. doctor to see into the ear and clean it. This may or may not be needed and your surgeon will discuss this with you.
What is a Tympanoplasty?
Tympanoplasty is the surgical repair to a hole in the eardrum or to a retraction pocket (the collapsed portion of the eardrum) and the reconstruction of the chain of bones (hammer, anvil and stirrup bones = ossicles) in the middle ear.
What is Mastoid Obliteration/Reconstruction?
This is where the mastoid cavity created by the drilling is filled in using the bone dust or artificial (prosthetic) bone and cartilage from the ear. The aim is to restore the normal ear canal. This will hopefully mean the ear will not need cleaning and the patient can go swimming without earplugs and get the ear wet. It also aids the future use of a hearing aid.
What does the operation involve?
Before the operation:
The day of the operation:
Admission is almost always on the day of surgery. The nurses will complete some routine paperwork and tests. You will be asked to change into a gown ready for theatre. The anaesthetist will come to see you and discuss the anaesthetic side of things. A member of the ENT team will also see you before your operation.
The operation is performed under general anaesthetic.
The operation itself:
The operation is performed with you asleep (under general anaesthetic), and takes 2-3 hours in all.
Normally one of two possible approaches to the mastoid bone is used. In the first, the posterior approach, the incision is made in the skin crease behind the ear. In the second, anterior approach, the incision is made from the roof of the ear canal upwards into the hairline. All incisions through skin involve cutting through some of the smaller nerves in the skin and result in some skin numbness. The numbness generally improves with time but it may take weeks or months because the nerves re-grow very slowly.
The bone of the mastoid is gradually removed with a fine drill, working from the hole or pocket in the eardrum backwards and upwards, gradually widening the ear canal as far as is needed to clear out the infected tissue. Often some areas of the eardrum need to be removed as well as some of the small bones that transmit sound from the eardrum to the inner ear if they are also diseased and infected. If it is possible an attempt at reconstructing the hearing will be made (a Tympanoplasty).
The area of bone bare in the mastoid that has resulted from the drilling (the cavity) is then covered with a thin sheet of graft tissue taken from the covering of a flat muscle in the area. The cavity and ear canal are packed with an antiseptic dressing. This may be a long piece of gauze bandage soaked in a yellow antiseptic ointment containing iodine or a dissolving sponge dressing soaked in antibiotic ear drops. If you are allergic to iodine please let me know before the operation. In some cases, the wall of the ear canal can be preserved (Combined Approach Tympanoplasty) or reconstructed (Mastoid Obliteration) to some degree at the end of the operation so that there is no cavity left after the surgery. Dressings will be placed in the ear canal after this procedure.
The skin wound is closed with some stitches and a pressure dressing is wrapped around the head to reduce any swelling or bruising around the ear over the next few hours. This dressing is removed prior to you going home.
The stitches used to close the skin may be buried and do not need to be removed as they will dissolve. If the stitches are not buried you will be given instructions on when to have them removed. Steristrips may be placed over the wound to protect it and these can be peeled off after 7 days.
After the operation:
After a short time in the recovery area, you will be taken back to the ward. You will be encouraged to drink and then eat as soon as the anaesthetic has worn off. You will be given painkillers as required but the operation is not usually painful.
Your discharge from hospital:
You may be able to go home from the hospital on the day of surgery (day case surgery). Following general anaesthesia, you will need to arrange for a responsible adult to pick you up from the hospital, take you home and stay with you for 24 hours after discharge. Depending on how fit and active you are before your operation, you may need to arrange for someone to stay with you for a few days.
POST OPERATIVE CARE
What should I do when I leave the hospital?
Be sure to keep the ear dry and do not go swimming. The best way to achieve this is with cotton wool and Vaseline to the outer ear canal. The wound behind the ear can get wet. Pat it dry with a towel but do not rub it as you might open up the wound.
You should not fly until Mr Price is happy that the ear has healed. This is because changes in the ear pressure especially during take-off and landing can push the graft out of place. Healing can be confirmed by your surgeon in outpatients. This is usually at around 6 weeks after the surgery.
You should not drive for at least 24 hours following your operation. You can then drive when you are able to perform an emergency stop safely.
You may feel rather tired for a week or so, but this will steadily improve. Returning to work will depend on your circumstances and type of work. You would normally need to be off work for 3-4 weeks. If your work requires heavy manual labour, then your surgeon may recommend that you have more time off to allow the ear to heal.
There is often some bloodstained ear discharge over the next few days from the packing in the ear. This is to be expected and can be dealt with by placing some cotton wool in the outer ear. Do not use any earbuds in the ears as you will cause damage. The cotton wool in the outer ear must be removed prior to putting in antibiotic drops if you were given some on discharge. A fresh piece of cotton wool can be put back in the ear if there is a lot of leaking. The operation is not usually particularly painful. There may be some discomfort around the ear and in the jaw joint area on chewing, but this is usually controlled by simple painkillers.
Patients will have Steri Strips (thin, sticky plasters) on the wound. These can be removed by yourself after a week.
Stitches are usually buried under the skin and will dissolve but if you have stitches that are visible on the surface, they need to be removed a week after the operation. You will be informed by your surgeon which stitches you have.
Patients are asked to return to the E.N.T. clinic about 3 weeks after the operation for removal of the dressings from the ear canal. This is normally a straightforward procedure but in some very young children, it may be performed under a short day-case anaesthetic. If a large piece of dressing was to fall out of the ear soon after the surgery please contact your surgeon for advice as a new dressing may be necessary.
At the 3 week stage, the mastoid cavity is beginning to heal itself, and you may be given some antibiotics and steroid eardrops to use for a week or two to keep the ear clean. Over the next few weeks, it is hoped that the mastoid cavity will line itself completely with skin. Patients generally attend the clinic at intervals for the cavity to be cleaned if necessary. The frequency of the visits varies from every few months to every year or two.
Are there any risks involved in this operation?
Although modern surgery and anaesthetics are considered to be safe, all medical procedures carry some risks. The surgeon will discuss all these risks with you.
Risks associated with the operation are:
Taste disturbance: The taste nerve runs close to the eardrum and may occasionally be damaged. This can cause an abnormal taste on one side of the tongue. This is usually temporary but occasionally it can be permanent.
Risks associated with a general anaesthetic are rare and include:
Are there any alternatives to this operation?
The only way to remove the infection completely is with an operation. In patients who are unfit for surgery, the only alternative is regular cleaning of the ear by an ear specialist and the use of eardrops. Sometimes the ear will have been examined and cleaned fully under a short day-case anaesthetic to see if this will improve things. This would at best only reduce the ear discharge and would not deal with the underlying problem.
If you would like a second opinion about the proposed surgery please ask your G.P or Surgeon to arrange this.
Are there any risks of not having this operation?
If you decide not to have surgery your symptoms may persist or worsen.
Where can I find out more about the operation?
Royal Australian College of Surgeons http://www.surgeons.org
Australasian Society of Otolaryngology and Head & Neck Surgery (ASOHNS) http://www.asohns.org.au
Alternatively, visit the following websites: ENT UK have a patient information leaflet: https://entuk.org/docs/patient_info_leaflets/09009_mastoid_surgery
If you have any questions about general anaesthetics, the Royal College of Anaesthetists website has a lot of information: http://www.rcoa.ac.uk/patientinfo
Further information and advice
If you experience post-operative smelly discharge; pain not relieved by painkillers or heavy bleeding after your operation please contact Mr Price’s rooms, your GP or go to the Accident & Emergency Department.
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