Gastric band surgery: how the band works, risks and long-term care

The band reduces how much food you can eat before you feel full. The NHS places it among the four main weight loss options, together with bypass, sleeve and balloon, and says all are intended for people with severe obesity. NHS consideration usually needs a BMI of 40 or more after other attempts at weight loss.

Its appeal is that nothing is cut out and the bowel is left alone. Its weakness is that it needs ongoing adjustment, so it suits people who can attend follow-up visits reliably and who are prepared to change how they eat. Anyone with reflux or difficulty swallowing should raise it with the surgeon, because the NHS lists heartburn and sickness as the signs of a band that has moved.

A band is not a good match for someone expecting it to change appetite without changes to eating behaviour. The NHS stresses that lifestyle and diet changes are part of the commitment for any weight loss surgery.

The alternatives are the sleeve gastrectomy and the gastric bypass, both of which are permanent changes to the stomach or bowel, a temporary gastric balloon, and non-surgical weight management. The NHS describes all as aiming to make the stomach smaller so that you feel full sooner.

In practice the choice depends on your health, the unit's experience and what each option means for follow-up. Ask your surgeon which of these operations the unit performs regularly.

Before surgery you will usually see a dietitian, may meet a psychologist and will have a check on your general health. A short diet to reduce the size of the liver is commonly requested, because a smaller liver gives the surgeon more room to work in keyhole surgery.

You will be given fasting instructions for the anaesthetic. Pack your regular medicines and comfortable clothing. If you smoke, stopping before surgery reduces risks with healing and breathing.

• Discuss reflux or swallowing difficulties with your surgeon beforehand.

• Check how adjustments are done, and how often visits are needed, before agreeing to a band.

• Plan transport home and some help for the first days.

The operation is done by keyhole surgery under general anaesthetic. The NHS says it usually takes three to four hours, which is longer than its quoted time for a bypass. Small cuts are made in the abdomen, the surgeon places the empty silicone band around the upper stomach and joins it to a port, which is fixed beneath the skin.

The NHS describes the band as being inflated through the port, so that it tightens like a belt to create two smaller stomach areas. Your unit will explain when and how the band is first tightened and how later adjustments are done.

The NHS says most people leave hospital one to three days after weight loss surgery. Your team will give you a diet plan and tell you what to eat while the stomach heals.

The NHS names band slipping out of position as the distinctive complication, which can cause heartburn, nausea or vomiting. It also lists the general risks of weight loss surgery: blood clots in the leg or lung, wound infection, gallstones with rapid weight loss, and excess skin after losing weight.

The pages retrieved for this guide do not give percentages for band slippage, port problems, erosion of the band into the stomach or the need for revision or removal, so none are quoted. Ask your surgeon how many of their band patients have needed a further operation and what the reasons were.

Band problems can make you unable to keep food down or cause pain after eating. These symptoms need medical review rather than waiting for the next scheduled visit.

The NHS gives four to six weeks to return to normal activities after weight loss surgery, with a diet that moves from fluids to runny foods, soft foods and then balanced eating, and advice to eat slowly, chew well and take small amounts.

Follow-up matters especially for a band because it can be adjusted. The Leeds advice for patients after bariatric surgery stresses regular review, annual blood tests and lifelong vitamin and calcium supplements, and lists difficulty swallowing, persistent vomiting, abdominal pain and heartburn as reasons to contact your GP. Ask your own team how adjustments are scheduled.

The NHS says follow-up after weight loss surgery continues for life, with at least two years at a clinic and then annual GP reviews.

Call 999 for severe abdominal pain, chest pain with leg swelling, difficulty breathing, continuous bleeding or vomiting blood. The NHS says to use NHS 111 or your GP urgently for fever, a fast heartbeat, difficulty swallowing or regular vomiting.

Redness, heat or discharge around the wound or port site should be reported to your GP or bariatric nurse. If your band feels suddenly different, with heartburn, persistent nausea or an inability to swallow, contact your unit promptly rather than waiting.

• Why a band rather than a sleeve or bypass for me?

• Who adjusts the band, how often, and where?

• What happens if the band slips or the port fails, and is revision covered?

• Can the band be removed, and what happens to weight if it is?

Availability of bands differs from place to place. If you are considering a band privately, ask what adjustment visits and revision procedures are included and for how long, because follow-up is the part that most affects how well a band works.