Anaesthesia – Types, Mechanism and Risks
Anaesthesia is the medical suppression of pain and consciousness during surgical procedures. It is achieved through anaesthetic agents and administered by specialist physicians.
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Anaesthesia is the medical suppression of pain and consciousness during surgical procedures. It is achieved through anaesthetic agents and administered by specialist physicians.
What is Anaesthesia?
Anaesthesia (also spelled anesthesia) is a medical procedure that temporarily eliminates a patient´s ability to feel pain, allowing surgical operations, diagnostic procedures, and other interventions to be carried out safely and comfortably. The word derives from the Greek for without sensation. Anaesthesia is planned and monitored by an anaesthetist – a physician who specialises in this field.
Types of Anaesthesia
There are several forms of anaesthesia, selected based on the type of procedure, the region of the body involved, and the overall health of the patient:
General Anaesthesia
General anaesthesia places the patient in a controlled state of unconsciousness. Pain perception, awareness, and muscle tone are all completely suppressed. Breathing is often supported by a mechanical ventilator. It is used for major operations such as abdominal, cardiac, or brain surgery.
Regional Anaesthesia
Regional anaesthesia numbs only a specific part of the body while the patient remains awake or lightly sedated. Common subtypes include:
- Spinal anaesthesia: An anaesthetic agent is injected into the spinal canal, numbing the lower half of the body – frequently used in caesarean sections.
- Epidural anaesthesia: The agent is injected into the epidural space, for example to manage pain during labour and delivery.
- Nerve block (plexus anaesthesia): A targeted nerve cluster is numbed, for example for procedures on the arm or shoulder.
Local Anaesthesia
Local anaesthesia numbs only a small, defined area of the body. It is used for minor surgical procedures, dental work, or wound care. The patient remains fully conscious and alert throughout.
Sedation
Sedation involves a mild to deep reduction in consciousness without complete unconsciousness. It is used, for example, during gastroscopy or minor dermatological procedures.
Mechanism of Action
Anaesthetic agents work by inhibiting nerve signal transmission. Inhalation anaesthetics (e.g., sevoflurane, isoflurane) are absorbed through the lungs and act on the central nervous system. Intravenous anaesthetics (e.g., propofol, ketamine) act directly on the brain by modulating specific receptors. Local anaesthetics (e.g., lidocaine, bupivacaine) block sodium channels in nerve fibres, preventing the local transmission of pain signals.
Preparation and Procedure
Before any anaesthesia, a pre-anaesthetic consultation is conducted. The anaesthetist reviews the patient´s medical history, current medications, allergies, and any previous experiences with anaesthesia. In many cases, fasting before the procedure is required to reduce the risk of aspiration (inhaling stomach contents). During the procedure, heart rate, blood pressure, oxygen saturation, and other vital parameters are continuously monitored.
Risks and Side Effects
Modern anaesthesia is very safe, but can cause side effects and, in rare cases, complications:
- Nausea and vomiting after anaesthesia (PONV)
- Sore throat caused by the breathing tube
- Drops or spikes in blood pressure
- Allergic reactions to anaesthetic agents
- In very rare cases: malignant hyperthermia – a life-threatening muscle reaction to certain anaesthetic agents
- Awareness (unintended regaining of consciousness during anaesthesia) – extremely rare
Serious complications are exceptionally rare in healthy patients. Individual risk depends on age, pre-existing conditions, and the nature of the procedure.
After Anaesthesia
After general anaesthesia, patients spend time in a recovery room where vital signs are closely monitored. Drowsiness, mild confusion, or dizziness may persist for several hours. Patients must not drive or operate machinery on the day of anaesthesia. After regional anaesthesia, numbness fades within hours depending on the agent used.
References
- World Health Organization (WHO): Safe Surgery Saves Lives. WHO Press, Geneva 2009.
- Miller R.D. (ed.): Miller's Anesthesia. 8th edition. Elsevier, Philadelphia 2015.
- National Institute for Health and Care Excellence (NICE): Anaesthesia – clinical guidelines and patient information. www.nice.org.uk
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