At a glance
General anaesthesia is a medically controlled state of deep unconsciousness that allows a surgeon to perform an operation while the patient feels nothing at all. An anaesthesiologist (a doctor who specialises in anaesthesia) gives a carefully calculated combination of medicines that switch off awareness, block pain signals, and relax the muscles, all at the same time.
Once the medicines enter the body, the brain stops registering sights, sounds, and sensations within seconds. A breathing tube or a mask keeps the airway open and delivers oxygen throughout the procedure. The anaesthesiologist stays in the operating room the entire time, adjusting the dose and watching vital signs every few seconds until the operation is finished and the medicines are reversed or allowed to wear off.
Medical Condition
General anaesthesia is not a treatment for a specific disease; it is an enabling step that makes other surgical or investigative procedures possible when the patient needs to be completely unconscious and motionless. It is chosen when local or regional anaesthesia (numbing only part of the body) is not enough, when the operation is too long or complex, or when the patient cannot cooperate.
- Major abdominal surgery, such as removal of the bowel, stomach, or gallbladder
- Heart and chest surgery, including bypass operations and lung procedures
- Brain and spinal surgery where any movement could be dangerous
- Long orthopaedic procedures such as joint replacement or spinal fusion
- Major cancer surgery requiring wide removal of tissue
- Extensive plastic or reconstructive surgery
- Procedures in children who cannot stay still under sedation alone
- Emergency surgery where there is no time to plan a regional technique
- Certain diagnostic procedures under general anaesthesia, such as a bronchoscopy (examination of the airways) when the patient is very anxious or the airway is difficult
General anaesthesia is generally avoided, or used only after careful weighing of risks, in certain situations.
- Patients with severe, uncontrolled heart or lung disease who may not tolerate the cardiovascular effects
- People with a known family history of malignant hyperthermia (a rare but dangerous reaction to certain anaesthetic gases)
- Patients who have not fasted long enough, because of the risk of inhaling stomach contents
- Some very frail or elderly patients where spinal or regional anaesthesia is safer
- Certain procedures that can be done safely with sedation or local anaesthesia alone
Risks & Complications
General anaesthesia has a strong safety record in healthy patients, but no medicine that affects the brain and heart is entirely without risk; the level of risk depends heavily on the patient's age, overall health, and the complexity of the surgery.
- Nausea and vomiting after waking up, the most common side effect
- Sore throat or hoarseness from the breathing tube placed in the airway
- Shivering and feeling cold in the recovery room
- Confusion, disorientation, or slow thinking for hours after waking, particularly in older patients
- Postoperative delirium (a temporary state of confusion and agitation) in elderly patients
- Postoperative cognitive dysfunction (subtle memory or concentration problems lasting weeks), most often in older adults
- Awareness under anaesthesia: a very rare event in which a patient has some degree of consciousness during surgery, though usually without pain
- Low blood pressure or irregular heartbeat during the procedure
- Breathing problems, including airway obstruction or a drop in blood oxygen levels
- Aspiration pneumonia (lung infection caused by inhaling stomach contents), more likely if fasting instructions were not followed
- Allergic reactions to anaesthetic medicines, ranging from mild rashes to rare severe reactions
- Malignant hyperthermia (a severe, life-threatening rise in body temperature triggered by certain anaesthetic agents), rare but serious and managed with specific reversal medicines
- In patients with significant heart, lung, kidney, or liver disease, the added stress of anaesthesia can worsen the underlying condition
Preparation & Procedure
Fasting is the single most critical preparation step. Most hospitals require patients to stop eating solid food six hours before the scheduled start of anaesthesia, and to stop drinking clear fluids such as water or diluted juice two hours before. This reduces the danger of inhaling stomach contents into the lungs while unconscious. Your anaesthesiologist will confirm the exact times at your pre-operative assessment.
Certain medicines are paused or continued depending on what they do. Blood thinners are often stopped several days before to reduce bleeding risk, while heart medicines and blood pressure tablets are usually continued with a small sip of water on the morning of surgery. Herbal supplements and some over-the-counter painkillers may also need to be stopped beforehand. The anaesthesiologist will give specific guidance at the pre-operative visit.
Smoking increases mucus in the airway and raises the risk of breathing complications during anaesthesia. Stopping even a few days before surgery makes a difference. Alcohol should be avoided in the days before the procedure, as it interacts with anaesthetic medicines and can affect how quickly the body processes them.
Before the day of surgery, the team usually runs a set of tests to assess fitness for anaesthesia. Common tests include:
- Blood tests to check kidney function, liver function, blood count, and clotting ability
- An electrocardiogram, or ECG (a recording of the heart's electrical activity), to screen for heart problems
- A chest X-ray if there is a history of lung or heart disease
- Lung function tests in patients with asthma or chronic lung disease
- Additional imaging such as an echocardiogram (an ultrasound of the heart) if the cardiac risk is higher
On the day itself, the process usually follows these steps:
- The patient arrives at the hospital and changes into a surgical gown
- A nurse places an intravenous (IV) cannula, a thin plastic tube, into a vein in the arm or hand
- The anaesthesiologist visits to review the plan, answer questions, and confirm fasting and allergy history
- A pre-medication, a calming medicine, may be given to reduce anxiety before entering the operating room
- In the operating room, monitoring equipment is attached: sticky pads on the chest for the ECG, a cuff on the arm for blood pressure, and a clip on the finger to measure oxygen in the blood
- Induction begins: the anaesthesiologist gives medicines through the IV line; the patient usually falls unconscious within a few breaths or seconds
- Once unconscious, a breathing tube or laryngeal mask airway (a soft seal placed over the back of the throat) is inserted to protect and manage the airway
- Anaesthesia is maintained with inhaled gases, continuous IV medicines, or both, throughout the surgery
- At the end of the operation, the anaesthetic medicines are stopped or reversed, the breathing device is removed, and the patient is taken to the recovery room
Aftercare
Most patients spend the first hour or two after surgery in the post-anaesthesia care unit (PACU), sometimes called the recovery room, where nurses monitor heart rate, blood pressure, oxygen levels, and pain until the patient is fully awake and stable. Depending on the surgery itself, the patient then moves to a general ward, a high-dependency unit, or, after day-surgery procedures, is discharged home once safe criteria are met.
- A responsible adult should escort the patient home after a day-surgery procedure and stay with them for the first 24 hours, as residual medicine can slow reflexes and judgement
- Driving, operating machinery, and signing legal documents are usually off-limits for at least 24 hours after general anaesthesia
- Drinking clear fluids is restarted once the patient is awake and not nauseous; the surgical team will advise when to return to eating
- Nausea is common in the first several hours and is treated with anti-nausea medicines; small sips of fluid and resting upright can help
- The throat may feel sore or scratchy for one to two days from the breathing tube; ice chips or lozenges usually ease this
- Some mental fogginess or fatigue is normal for the first day or two, especially in older patients; strenuous mental or physical work should wait
- Pain relief after surgery is managed by the medical team and may involve a combination of regular tablets, IV medicines, or a nerve block (numbing of a specific nerve region), depending on the operation performed
- Wound care, drain management, and any specific restrictions are set by the surgical team, not the anaesthesia team, and will be explained before discharge
- A follow-up appointment is usually scheduled within a few weeks; any unusual symptoms such as chest pain, difficulty breathing, a high fever, or extreme confusion after returning home need prompt medical attention
Cost & What Determines It
The cost of general anaesthesia varies widely because it is not a standalone service but is bundled into a surgical episode that has many moving parts. The anaesthesia fee itself is only one component, and several factors can push the total bill significantly higher or lower.
- Complexity and duration of the surgery: longer and more complex operations require more anaesthetic agents, closer monitoring, and more time from the anaesthesiologist, all of which affect the fee
- Patient health status: patients with significant heart, lung, kidney, or other conditions require more intensive pre-operative assessment, specialised monitoring equipment, and a higher level of vigilance throughout
- Type of anaesthetic technique used: total intravenous anaesthesia (TIVA, where medicines are given through a drip the entire time) may be priced differently from inhalation-based techniques or combined approaches
- Hospital class and country: a private hospital in a major city will charge more than a public or regional facility, and fees differ substantially from country to country
- Length of stay in the recovery unit or ICU after surgery, which may itself be driven by the patient's underlying condition rather than the anaesthesia
- Use of specialised monitoring devices such as a depth-of-anaesthesia monitor (a device that measures brain activity to guide medicine dosing) or an arterial line (a thin tube placed in an artery for continuous blood pressure reading)
- Medicines used for reversal of muscle relaxants, management of nausea, or treatment of unexpected events during surgery
- Pre-operative tests required by the anaesthesiologist before clearing the patient for surgery
Hospital packages for surgical procedures often include the anaesthesiologist's fee, theatre use, and basic recovery room care. Items that are commonly billed separately include the pre-operative consultation, specialised monitoring equipment, medicines given during and after surgery, any ICU stay, and post-operative pain management devices such as a patient-controlled analgesia (PCA) pump.
For Indonesian patients considering treatment abroad, BPJS Kesehatan and most Indonesian private insurance policies do not cover procedures performed outside Indonesia. This means most patients pay out of pocket or rely on international health insurance that specifically covers overseas treatment. Requesting a written, itemised cost estimate from the hospital before making any travel arrangements is the most reliable way to understand the full financial picture and avoid unexpected charges on arrival.
Frequently Asked Questions
How does general anaesthesia feel when it starts?
Most people feel a brief wave of dizziness or warmth, then simply fall asleep within seconds. A sedative is given through a drip in your hand or arm, and the effect is fast enough that many patients do not even remember it starting. You feel no pain and have no awareness of the procedure while you are under.
How many sessions of general anaesthesia will I need?
General anaesthesia is given once for each procedure that requires it, so the number of times you receive it depends entirely on how many operations your treatment plan involves. If a follow-up surgery is needed, your anaesthesiologist will assess you again before each one. Your overall health and any medicines you take are reviewed every time.
How soon will I feel normal again after general anaesthesia?
Most people feel groggy, dizzy, or slightly nauseous for a few hours after waking up, and these effects usually clear within half a day. Grogginess that lingers past the first day, high fever, or severe confusion are signs to report to your medical team straight away. Older patients or those who had a long procedure may take a little longer to feel fully alert.
How much does general anaesthesia cost?
The cost depends on several factors specific to your case, including the length and complexity of the procedure it supports, the type of hospital or clinic, and the level of monitoring equipment used throughout. A written estimate from the hospital will give you the most accurate figure for your situation.
This page is general information, not a substitute for medical advice. Every case is different. Your doctor decides what is right for you.
