SurgeryLesson 2 of 3 in the course Anesthesia

General Anaesthesia: Principles and Perioperative Management

5 flashcards · 5 quiz questions · 5 match pairs · 3 fill-in sentences · English

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Summary

General anaesthesia is a medically controlled state that allows procedures to take place without awareness or responses to painful stimuli. This lesson introduces its defining features, purposes, historical development, and current understanding of how anaesthetic drugs affect the nervous system.

General anaesthesia is drug-induced loss of consciousness that makes a subject unarousable, even by painful stimuli. Medications may be inhaled or injected and are often combined with analgesics and, when needed, neuromuscular blocking agents. It is used in human and veterinary medicine, as well as in wildlife management to enable research, treatment, or relocation. In those settings, drugs may be delivered at a distance, for example by dart gun, or administered in a medical or veterinary facility.

All flashcards

What is general anaesthesia?
Drug-induced loss of consciousness that makes a subject unarousable, even by painful stimuli.
What are the principal goals of surgical anaesthesia?
Unconsciousness, analgesia, amnesia, immobility, and—when needed—skeletal muscle relaxation or paralysis.
What is target-controlled infusion (TCI)?
Computer-controlled infusion that targets a desired drug concentration, commonly using propofol.
What does capnography help assess during anaesthesia?
Ventilation, by measuring carbon dioxide in exhaled gas.
Why may anaesthesia require airway support?
It can impair breathing and reduce protective airway reflexes.

Quiz questions

  1. What does the Mallampati score assess during preoperative airway evaluation?Answer: Airway classification based on which throat structures are visible.
  2. What characterizes Stage 4 in Guedel's classification of anaesthesia?Answer: Severe medullary depression, respiratory cessation, and possible cardiovascular collapse.
  3. What does capnography measure during anaesthesia?Answer: Carbon dioxide in exhaled gas to help assess ventilation.
  4. How does a peripheral nerve stimulator help during neuromuscular blockade?Answer: It stimulates a nerve and measures the resulting muscle response.
  5. Which finding is commonly used as one criterion for readiness for tracheal extubation?Answer: The patient can respond to and follow verbal commands.

Based on the Wikipedia article General anaesthesia, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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