Induction of anaesthesia

Abstract

General anaesthesia is a state of controlled unconsciousness utilized to perform a therapeutic procedure. The aims of anaesthesia have traditionally been summarized by the triad of hypnosis, analgesia and muscle relaxation. The process begins with preoperative assessment of the patient before ensuring equipment and drugs are available and safe to use. Anaesthesia commences with administration of induction agents, delivered via inhalational or intravenous routes. Consideration of airway management is an essential component of the induction phase of anaesthesia. The choice and dose of induction agent is multifactorial and can include: co-morbidity; type of surgery, age and patient physiology. Following induction of anaesthesia, the maintenance phase of anaesthesia can be delivered via an inhalation or intravenous route. The administration of anaesthetic drugs is generally associated with rapid loss of airway reflexes and cardiorespiratory changes. Complications of general anaesthesia can include awareness, aspiration, anaphylaxis, airway loss, laryngospasm, cardiovascular instability, malignant hyperpyrexia and dental damage. Meticulous attention to detail is vital to minimize the risk of these potential complications.