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General Anaesthesia: Procedure, Risks and Uses
General anaesthesia is a medically induced state of unconsciousness in which awareness and pain sensation are completely suppressed, enabling pain-free surgical procedures.
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General anaesthesia is a medically induced state of unconsciousness in which awareness and pain sensation are completely suppressed, enabling pain-free surgical procedures.
What is General Anaesthesia?
General anaesthesia (also spelled general anesthesia) is a medically controlled state of total unconsciousness. During general anaesthesia, awareness, pain sensation, reflexes, and muscle tone are completely suppressed. It is primarily used for major surgical procedures where local or regional anaesthesia is insufficient or unsuitable.
Mechanism of Action
General anaesthesia is achieved through a combination of drugs that act on the central nervous system to produce four essential components:
- Hypnosis: Loss of consciousness and awareness
- Analgesia: Elimination of pain sensation
- Amnesia: Prevention of memory formation during the procedure
- Muscle relaxation: Relaxation of skeletal muscles to optimise surgical conditions
The medications used are administered either intravenously (directly into the bloodstream) or as inhaled gases through the airways. Commonly used agents include propofol, sevoflurane, fentanyl, and rocuronium.
Stages of General Anaesthesia
Pre-anaesthesia Preparation
Before the procedure, the patient undergoes a detailed consultation with an anaesthesiologist. Medical history, current medications, allergies, and overall health status are reviewed. The patient is typically required to fast for several hours to minimise the risk of aspiration (inhalation of stomach contents).
Induction
Anaesthesia is usually induced via an intravenous injection of a sedative agent such as propofol. Loss of consciousness occurs within seconds. Analgesics and muscle relaxants are then administered, and ventilation is secured using an endotracheal tube or a laryngeal mask airway.
Maintenance
During surgery, anaesthesia is maintained using an inhaled anaesthetic agent (e.g., sevoflurane) or a continuous intravenous infusion. The anaesthesiologist continuously monitors heart rate, blood pressure, oxygen saturation, and respiratory function throughout the procedure.
Recovery
At the end of the procedure, anaesthetic agents are discontinued. The patient awakens in a dedicated recovery room, where vital signs are closely monitored by medical staff until the patient is stable and fully oriented.
Indications
General anaesthesia is used for a wide range of procedures, including:
- Abdominal surgery (e.g., appendectomy, gastric surgery)
- Cardiac and vascular surgery
- Orthopaedic procedures (e.g., hip replacement, spinal surgery)
- Neurosurgical interventions
- Longer procedures in ear, nose, and throat (ENT) surgery or oral and maxillofacial surgery
- Procedures in children who cannot tolerate local anaesthesia
Risks and Side Effects
General anaesthesia is considered very safe with modern medications and monitoring technology. However, side effects can occur:
- Common: Postoperative nausea and vomiting (PONV), sore throat from the endotracheal tube, hoarseness, tingling or numbness
- Less common: Drop in blood pressure, allergic reactions, dental injury from intubation
- Rare: Awareness during anaesthesia (unintended consciousness during the procedure), malignant hyperthermia (a life-threatening muscle reaction to certain anaesthetic gases), aspiration
Individual risk depends significantly on age, pre-existing conditions, and the type of procedure. Serious complications are extremely rare in otherwise healthy patients.
Special Patient Groups
Children are more sensitive to anaesthetic agents and require carefully adjusted dosages. Elderly patients face a higher risk of postoperative cognitive dysfunction. In pregnant patients, general anaesthesia is avoided where possible; when necessary, special protective measures are taken to safeguard the unborn child.
References
- Deutsche Gesellschaft für Anästhesiologie und Intensivmedizin (DGAI): Guidelines on General Anaesthesia. www.dgai.de
- Rossaint R, Werner C, Zwissler B (eds.): Die Anästhesiologie. Springer Medizin Verlag, 3rd Edition, 2012.
- Butterworth JF, Mackey DC, Wasnick JD: Morgan and Mikhail's Clinical Anesthesiology. McGraw-Hill Education, 6th Edition, 2018.
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