Anaesthesia is something most people think about briefly and then put to one side as the surgeon’s problem. I understand that instinct, but when you are having bariatric surgery, there are specific anaesthetic considerations that are worth understanding before you walk into theatre. James had a pre-flagged adverse reaction to a specific anaesthetic agent that was managed carefully in theatre in March 2024. What that experience taught us is that communication with the anaesthetic team is as important as communication with your surgeon.
Why Bariatric Patients Require Specific Anaesthetic Consideration
Carrying significant excess weight changes how anaesthesia works and what risks it carries. These are not reasons to avoid surgery, but they are reasons to make sure your anaesthetic team is experienced in bariatric procedures specifically.
Airway management is one of the primary concerns. Excess tissue around the neck and throat can make intubation more technically challenging, and the reduced functional residual capacity of the lungs in people with obesity means that oxygen reserves deplete faster once breathing stops. Bariatric anaesthetists routinely account for this by positioning patients carefully, pre-oxygenating thoroughly before induction, and having backup airway equipment ready.
Drug dosing is more complex in bariatric patients because the relationship between body weight and drug distribution changes significantly with obesity. Anaesthetic drugs are not simply dosed on total body weight. Experienced bariatric anaesthetists use adjusted dosing calculations that account for lean body mass and volume of distribution. Aspiration risk is also higher due to increased intra-abdominal pressure, and a rapid sequence induction technique is often used to minimise the window between loss of consciousness and securing the airway.
James’s Adverse Reaction: What Happened and What We Learned
Before our surgery in Riga, James had flagged a known sensitivity to a specific inhalational anaesthetic agent from a previous surgical experience. He had experienced a prolonged and unpleasant recovery characterised by severe nausea, confusion, and distress that was disproportionate to what the surgical team expected. This had been documented and communicated to the anaesthetic team at Weight Loss Riga well in advance.
The anaesthetist visited James the evening before surgery to discuss this specifically. They had already reviewed the notes and planned to use an alternative agent. In theatre, James’s recovery from anaesthesia was managed with targeted anti-emetic therapy and close observation. The outcome was a smoother recovery than his previous experience, which was a direct result of that prior communication.
The lesson is straightforward: if you have ever had a difficult experience with anaesthesia, tell your surgical team early and in writing. Do not assume the information will travel automatically, particularly if you are having surgery abroad or at a different hospital from where the previous experience occurred. Write it in your patient questionnaire, raise it in consultation, and raise it again when the anaesthetist visits you pre-operatively.
The Pre-Operative Anaesthetic Assessment
Before your surgery, you will have a formal assessment with an anaesthetist or anaesthetic nurse. This will cover your full medical history, current medications, any known allergies or sensitivities, previous anaesthetic experiences, and your airway anatomy. Be as thorough as possible. Mention any herbal supplements you take, any history of malignant hyperthermia in your family, and any previous reactions to medications administered in a medical setting.
If you take regular medications, confirm with the anaesthetist which ones you should take on the morning of surgery with a small sip of water and which you should omit. Medications for blood pressure, thyroid conditions, and certain psychiatric conditions often need to be continued. Diabetes medications and blood thinners typically need specific management around surgery and your instructions will be tailored to you.
Waking Up and Managing Post-Operative Nausea
Post-operative nausea and vomiting (PONV) is one of the most common complaints after general anaesthesia and tends to be more prevalent in bariatric patients. Most surgical teams now administer prophylactic anti-emetics during and after surgery, but if you know you are particularly prone to post-operative nausea, mention this specifically. There are multiple anti-emetic drugs available and the team can use a combination approach if needed.
Pain in the recovery room is managed with intravenous analgesics. Tell the recovery nurse your pain level and do not try to manage it stoically. Adequate pain control in the early post-operative period actually aids recovery by allowing you to breathe deeply and move.
Sources
NHS. General anaesthesia. Available at: https://www.nhs.uk/conditions/general-anaesthesia/
Royal College of Anaesthetists. Anaesthesia explained. Available at: https://www.rcoa.ac.uk/patients-carers/patient-information-resources/anaesthesia-explained
BOMSS. Guidelines on peri-operative and postoperative biochemical monitoring and micronutrient replacement for patients undergoing bariatric surgery. Available at: https://www.bomss.org.uk/
Association of Anaesthetists. Peri-operative management of the obese surgical patient. Available at: https://anaesthetists.org/
About this content
This blog is written by James and Kirsten, a couple from the UK who had gastric sleeve surgery together in March 2024.
We started this blog because we couldn't find any sources of content that details before surgery, the surgery and then life post surgery - so we decided to write one ourselves.
Everything on this site is based on our own experience and the research we have done along the way. It is not medical advice. Gastric sleeve surgery is a serious procedure and every patient's journey is different. Please always consult your own bariatric team or GP before making any decisions about your health or treatment.
Some posts on this site may contain featured or sponsored content, or affiliate links. Where this is the case, it will always be clearly stated at the top of the article. Our opinions are always our own.
Publish Date: 18 June 2026 | Last Reviewed: 18 June 2026 | Next Planned Review: 18 December 2027