esófago de Barrett

¿Qué es el esófago de Barrett?

esófago de Barrett

Barrett's oesophagus is a condition which affects the lower gullet (oesophagus). It is named after the doctor who first described it.

In Barrett's oesophagus, the cells lining the affected area of oesophagus become changed.

The cells of the inner lining (epithelium) of a normal oesophagus are pinkish-white, flat cells (squamous cells). The cells of the inner lining of the area affected by Barrett's oesophagus are tall, red cells (columnar cells). The columnar cells are similar to the cells that line the stomach.

Another name sometimes used by doctors for Barrett's oesophagus is columnar-lined oesophagus (CLO).

Comprender el esófago y el estómago

When we eat, food passes down the gullet (oesophagus) into the stomach. Cells in the lining of the stomach make acid and other chemicals which help to digest food. Stomach cells also make a thick liquid (mucus) which protects them from damage caused by the acid. The cells on the inside lining of the oesophagus are different and have little protection from stomach acid.

There is a circular band of muscle (a sphincter) at the junction between the oesophagus and stomach. This relaxes to allow food down but normally tightens up and stops food and acid leaking back up (refluxing) into the oesophagus. So, the sphincter acts like a valve.

The changed cells of Barrett's oesophagus are not cancerous (malignant). However, these cells have an increased risk, compared with normal gullet (oesophageal) cells, of turning cancerous in time. The changed cells in Barrett's oesophagus can develop something called dysplasia. A cell with dysplasia is an abnormal cell. It is not cancerous but is more likely than other cells to develop into cancer. It is often called a precancerous cell.

Dysplasia

There are various degrees of dysplasia - from low-grade dysplasia to high-grade (severe) dysplasia. Cells that are classed as high-grade dysplasia have a high risk of turning cancerous at some point in the future.

But note: if you have Barrett's oesophagus, the chance that it will progress to dysplasia, then to high-grade dysplasia, and then to cancer of the oesophagus, is small. In the majority of cases with Barrett's oesophagus, the changes in the cells remain constant and do not progress. Studies have shown that, for a person diagnosed with Barrett's oesophagus, their lifetime risk of developing cancer of the oesophagus is about 1 in 20 for men and about 1 in 33 for women.

The cause of Barrett's oesophagus, in most cases, is thought to be due to long-term gastro-oesophageal reflux disease (GORD), with reflux of acid and other stomach contents into the gullet (oesophagus) from the stomach. The acid irritates the lining of the lower oesophagus and causes inflammation (oesophagitis). With persistent reflux, eventually the lining (epithelial) cells change to those described above.

It is thought that about 1 in 20 people who have recurring acid reflux eventually develop Barrett's oesophagus. The risk is mainly in people who have had severe acid reflux for many years. However, some people who have had fairly mild symptoms of reflux for years can develop Barrett's oesophagus.

Barrett's oesophagus seems to be more common in men than in women. It typically affects people between the ages of 50 and 70 years.

Other risk factors include hiatus hernia, past history of inflammation of the oesophagus (esofagitis) or narrowing of the oesophagus (oesophageal stricture).

Most people with Barrett's oesophagus have symptoms of acid reflux.

What are the symptoms of acid reflux and inflammation of the gullet (oesophagitis)?

Heartburn is the main symptom of acid reflux. It is a burning feeling that rises from the upper tummy (abdomen) or lower chest up towards the neck. (It is confusing, as it has nothing to do with the heart.) Other common acid reflux symptoms include:

• Feeling sick (nauseated).

• An acid taste in the mouth.

• Hinchazón.

• Burping (belching).

• A burning pain when you swallow hot drinks.

Like heartburn, these symptoms tend to come and go and tend to be worse after a meal. People with Barrett's oesophagus will usually have (or will have had in the past) the symptoms associated with acid reflux and oesophagitis.

What causes acid reflux and who is affected by it?

The circular band of muscle at the bottom of the oesophagus is called the sphincter. It normally prevents acid reflux. Problems occur if the sphincter does not work very well. This is common but in most cases it is not known why it does not work so well.

However, having a hiatus hernia makes you more prone to reflux. A hiatus hernia occurs when part of your stomach protrudes through the lower chest muscle (diaphragm) into the lower chest. See the separate leaflet called Hiatus Hernia for more details.

How is acid reflux treated?

A medicine which prevents your stomach from making acid is a common treatment and usually works well. Some people take short courses of treatment when symptoms flare up. Some people need long-term daily treatment to keep symptoms away. An operation to tighten the sphincter muscle is an option in severe cases which do not respond to medication, or where full-dose medication is needed every day to control symptoms.

There are also various things that you can try to change in your lifestyle that may help to treat your acid reflux. These include:

• Perder peso if you are overweight.

• Dejar de fumar if you are a smoker.

• Reducing your alcohol intake if you drink a lot of alcohol.

See the separate leaflet called Acid Reflux and Oesophagitis (Heartburn) for more details.

esófago de Barrett itself usually causes no symptoms. However, you are likely to have, or have had, the symptoms of long-standing or severe reflux disease described earlier.

Gastroscopia (endoscopia)

Diagnosis of Barrett's oesophagus may include a gastroscopy if you have severe or persistent symptoms of acid reflux. For this test, a thin, flexible telescope is passed down the gullet (oesophagus) into the stomach. This allows a doctor or nurse to look inside. This test can usually help to diagnose Barrett's oesophagus. The change in colour of the lining of the lower oesophagus from its normal pale white to a red colour strongly suggests that Barrett's oesophagus has developed.

Una biopsia

If Barrett's oesophagus is suspected during gastroscopy then several small samples (biopsies) are taken of the lining of the oesophagus during the gastroscopy. These are sent to the laboratory to be looked at under the microscope. The characteristic columnar cells which are described above confirm the diagnosis. The cells are also examined to see if they have any signs of dysplasia (see above).

Treatment of acid reflux

This treatment is as described above. You are likely to be advised to take acid-suppressing medication for the rest of your life. It is unclear as to whether treating the acid reflux helps to treat or reverse your Barrett's oesophagus and more studies are ongoing. However, this treatment should help any symptoms that you may have.

Monitoring (surveillance)

When you have been diagnosed with Barrett's oesophagus, you may be advised to have a gastroscopy and biopsy at regular intervals to monitor the condition. This is called surveillance. The biopsy samples aim to detect whether dysplasia has developed in the cells, in particular if high-grade dysplasia has developed.

The exact time period between each gastroscopy and biopsy sample can vary from person to person. It may be every 2-5 years (depending on the length of oesophagus that is affected) if there are no dysplasia cells detected. Once dysplasia cells are found, the check may be needed more frequently. If high-grade dysplasia develops, you may be offered treatment to remove the affected cells from the gullet (oesophagus). (Treatment details are discussed below.)

Surgery may be considered

If you develop high-grade dysplasia or oesophageal cancer, the traditional treatment is to undergo surgery to remove the oesophagus (oesophagectomy). This is a major operation and complications following surgery, sometimes serious and life-threatening, are not uncommon.

But most people who develop Barrett's oesophagus do not go on to need an oesophagectomy. Also, newer therapies that have been developed are becoming more popular options if you develop high-grade dysplasia or early cancer.

Research continues to find out which treatment is best. If you are diagnosed with Barrett's oesophagus, your specialist should be able to give you up-to-date information on the pros and cons of surveillance. They should also be able to advise on the current situation about the various treatment options should you develop dysplastic changes to the cells.

Various ways of removing just the abnormal dysplastic cells from the lining of the oesophagus (or even early cancers that just affect the lining on the oesophagus) have recently been developed. These include the following:

Photodynamic therapy (PDT)

This is a type of laser treatment. It has been used in the past but has been largely replaced by radiofrequency ablation.

Epithelial radiofrequency ablation (EFA)

This treatment uses a radiofrequency energy coil. Again, this involves a gastroscopy. During the procedure a small coil is guided towards the abnormal section of your oesophagus. The coil then emits heat energy which destroys the abnormal cells. Nearby normal cells then multiply and replace the destroyed abnormal cells.

Argon plasma coagulation

This treatment uses a jet of argon gas, together with an electric current, to burn away dysplastic cells.

Endoscopic mucosal resection (EMR)

This is a procedure that is done via instruments passed down the side of a gastroscope. Basically, the affected inner lining of the oesophagus is stripped off.

Crioterapia con globo

The National Institute for Health and Care Excellence (NICE) has looked at the evidence for effectiveness and safety of a procedure called balloon cryoablation in treating Barrett's oesophagus.

This procedure is usually done using sedation. A balloon catheter (a thin tube with a deflated balloon on the end) is passed into the oesophagus, using a small flexible telescope. It is lined up with the abnormal tissue and inflated. Nitrous oxide is then sprayed through very precisely into the area to destroy abnormal cells by the extreme cold.

The committee found that there was not enough evidence that it was safe and effective. They have therefore recommended that until there is more evidence, it should only be offered as part of a research study.

Barrett's oesophagus increases the risk of oesophageal cancer, but most people with Barrett's oesophagus will not develop oesophageal cancer.

It is estimated that, without treatment, between 5 and 10 out of 100 people with Barrett's oesophagus will develop oesophageal cancer over 10-20 years.