Anaesthesia: the questions that make your operation safer

The single most useful question

Ask: who will be giving my anaesthetic, what are their qualifications, and will they be present with me for the whole operation?

This is the question that most reliably separates a well-run operating theatre from a poorly run one, and it is entirely reasonable to ask. Anaesthesia is delivered by a qualified anaesthetist, a doctor with postgraduate training in anaesthesiology. During your anaesthetic, someone with that training should be continuously monitoring you. You are entitled to know their name.

Ask it politely and ask it early, at the pre-anaesthetic visit rather than at the theatre door. A good department answers without hesitation. Reluctance to answer is itself information.

The related question worth asking is what monitoring will be used. For general anaesthesia, continuous monitoring of oxygen levels, heart rhythm, blood pressure and exhaled carbon dioxide is standard, and capnography, the measurement of exhaled carbon dioxide, is specifically a critical safety measure because it detects a misplaced breathing tube within seconds. You do not need to understand the machines. You need to know that someone qualified is watching them throughout.

What you must disclose, and why each item matters

Nothing improves your safety more than a complete history. Anaesthetists are not making conversation; each question exists because the answer changes what they do.

All medicines, and this means all. Prescription drugs, tablets you buy without prescription, painkillers, inhalers, eye drops, and specifically ayurvedic, homeopathic, siddha, unani and herbal preparations, and any supplements. This last group matters and is chronically under-declared, partly because patients assume natural means irrelevant. Several herbal preparations affect bleeding, blood pressure, blood sugar or sedation. Bring the actual boxes and strips with you rather than trying to remember names.

Blood thinners and antiplatelet drugs. Aspirin, clopidogrel, warfarin and newer anticoagulants all need a specific plan: stop, continue, or bridge with something else. Stopping them without advice can cause a clot or a stent blockage; continuing them without advice can cause serious bleeding. You need a written instruction, with dates, and if you have a heart stent you must say so explicitly.

Diabetes medicines, and especially insulin. Fasting while on diabetes medication needs a plan for what to take and what to skip. Ask for it in writing, including what to do if your sugar drops the morning of surgery.

Allergies, and describe what actually happened. A rash is different from swelling of the throat, which is different from an upset stomach. Be specific, because a genuine drug allergy changes the drugs used and a mislabelled one narrows the options unnecessarily.

Previous anaesthesia, yours and your family's. If you were slow to wake, had severe vomiting, had a difficult breathing tube, or had awareness during surgery, say so. If any blood relative has had a serious reaction to anaesthesia, say that too, because a rare inherited condition called malignant hyperthermia runs in families and completely changes the drugs used. Bring any old anaesthetic records you have.

Snoring and sleep. Loud snoring, witnessed pauses in breathing, waking unrefreshed and daytime sleepiness suggest obstructive sleep apnoea, which raises anaesthetic risk substantially and is usually undiagnosed. Declare it even if nobody asks.

Smoking, alcohol, tobacco chewing and any recreational drug use. This is not a moral inquiry. Alcohol and drug use change how much anaesthetic you need and how you behave on waking, and undeclared heavy alcohol use can cause dangerous withdrawal in hospital. Anything you tell an anaesthetist is medical information.

Teeth. Loose teeth, caps, crowns, bridges and dentures can be damaged or dislodged during airway management. Point them out beforehand.

And for any woman who could be pregnant, say so or ask for a test. Anaesthesia and surgery in early pregnancy carry different considerations, and this is not a question to leave to assumption.

Fasting, and the reason it is not negotiable

Under anaesthesia, the reflexes that stop stomach contents entering your windpipe are switched off. If your stomach has food in it, that material can be inhaled into the lungs, causing a severe and sometimes fatal pneumonia. This is why fasting instructions exist and why an operation gets cancelled when they are not followed.

Modern guidance is more humane than the old instruction to have nothing after midnight. Typically clear fluids are allowed until a couple of hours before surgery while solid food needs longer, often six hours, and milk counts as food rather than a clear fluid. Ask for your exact timings in writing, because they differ by hospital, by procedure and by patient.

Two honest points. First, if you did eat or drink something, say so. The consequence of admitting it is a delayed operation. The consequence of hiding it is a preventable disaster. Nobody will be angry with you; they will be grateful.

Second, unnecessarily prolonged fasting is itself a problem, particularly in children, the elderly and diabetics, causing dehydration, low blood sugar, headache and misery. If your surgery is delayed by hours, it is reasonable to ask whether you may have clear fluids in the meantime. This question is asked far too rarely.

The types, and how the choice gets made

General anaesthesia means you are fully unconscious, usually with a tube to manage your breathing, and it is used for major surgery and where the operation requires it.

Spinal and epidural anaesthesia involve an injection near the spine that numbs you from roughly the waist down while you stay awake. They are widely used for caesarean sections, lower limb surgery, hernia repair and urology, and they avoid several of the effects of general anaesthesia. Many patients fear them, particularly because of the belief that a spinal causes lifelong back pain. Mild soreness at the injection site for a few days is common; long-term back pain caused by a properly performed spinal is not the usual outcome, and back pain after surgery has many other causes including how you were positioned.

Regional nerve blocks numb a specific limb or region and are excellent for pain control, often used alongside another technique so you need fewer opioid painkillers afterwards.

Local anaesthesia with or without sedation is used for smaller procedures, with the area numbed and you awake or drowsy.

The choice is genuinely technical: it depends on the operation, its expected duration, your heart and lung health, your spine, whether you are on blood thinners, and your own preference. A good anaesthetist explains the options that are appropriate for you and why one is preferred. What you should not accept is finding out which anaesthetic you had after the event.

One thing worth asking if you are having a spinal or staying awake: what will I see and hear, and can I have something to make me drowsy? Some people want to be aware, others find the sounds of surgery distressing. Sedation can usually be arranged, and saying so beforehand is much easier than during.

Risks, stated in proportion

For a healthy person having planned surgery, the risk of dying from anaesthesia itself is very low. The risks that are worth understanding are the common minor ones and the rare serious ones, and being told about them lets you recognise a problem rather than making you fear the procedure.

Common and usually temporary: nausea and vomiting, sore throat from the breathing tube, shivering, drowsiness and poor concentration for a day or two, muscle aches, bruising at the drip site, and difficulty passing urine after a spinal. If you have vomited badly after a previous anaesthetic, say so, because prevention is far more effective than treatment.

Less common: damage to teeth or lips, a headache after a spinal or epidural that can be severe and is treatable, and temporary nerve irritation causing a patch of numbness that usually resolves.

Rare and serious: severe allergic reactions, aspiration of stomach contents, awareness during general anaesthesia, permanent nerve injury, and inherited reactions such as malignant hyperthermia. These are the reasons for the assessment, the fasting rules and the monitoring.

Two groups need extra attention. Older adults have a meaningful risk of confusion and delirium after surgery, which is frightening for families who were not warned; ask about it, and ask what can be done to reduce it, such as keeping glasses and hearing aids available, minimising sedatives and restoring normal sleep and routine quickly. Children need anaesthetists comfortable with their age group, and a parent is usually allowed to stay until the child is asleep, which is worth asking for.

It is also worth knowing that risk is not fixed. Stopping smoking even a few weeks before surgery improves lung outcomes. Controlling blood sugar and blood pressure before an elective operation reduces complications. Correcting anaemia before surgery reduces the chance of needing a transfusion. If your operation is planned rather than urgent, these weeks are worth using.

Pain after surgery, planned before surgery

The best time to discuss pain relief is before the operation, when you can think clearly and ask questions. After surgery, in pain, is the worst time.

Ask what the plan is: which medicines, by which route, on what schedule, and what happens if it is not enough. Ask specifically whether a nerve block is possible for your operation, because a good block can substantially reduce the need for stronger painkillers.

Ask for pain relief on a schedule rather than only when you ask for it, at least for the first day or two. Waiting until pain is severe means chasing it. This matters practically as well as humanely: pain that stops you breathing deeply, coughing and walking raises your risk of chest infection and blood clots.

Tell them what has and has not worked for you before, and mention if you take regular painkillers or opioids already, because your requirement will be different.

Finally, ask what you will go home with and for how long, and specifically what to do if the pain is still bad after the tablets run out. Being discharged with two days of painkillers and a week of pain is a common and avoidable failure.