Anaesthesiology
Introduction to Anaesthesiology
Introduction to anaesthesiology for MBBS: history, roles of the anaesthesiologist, safe anaesthesia principles, WHO surgical safety checklist and monitoring, mapped to NMC codes AS1.
MedNext Academy | 3 min read
Introduction to Anaesthesiology
Introduction to anaesthesiology for MBBS: history, roles of the anaesthesiologist, safe anaesthesia principles, WHO surgical safety checklist and monitoring, mapped to NMC codes AS1.
This chapter sets out what anaesthesiology is as a specialty, from its historical milestones to its modern scope across theatre, intensive care and pain medicine. It covers the roles of the anaesthesiologist, the infrastructure and drugs needed for safe practice, and the checklists and monitoring that underpin patient safety.
High-yield: Introduction to Anaesthesiology
- The first successful public demonstration of ether anaesthesia was by William Morton at the Massachusetts General Hospital in 1846.
- John Snow was the first physician anaesthetist and administered chloroform to Queen Victoria for childbirth, popularising obstetric analgesia.
- The triad of general anaesthesia is unconsciousness (hypnosis), analgesia and muscle relaxation, with suppression of autonomic reflexes.
- The anaesthesiologist has three broad roles: perioperative care, critical care in the intensive care unit and acute and chronic pain management.
- Perioperative care is divided into preoperative assessment, intraoperative management and postoperative recovery.
- A pre-use check of the anaesthesia machine, including a leak test and confirmation of oxygen supply, is mandatory before every list.
- Every anaesthetic workstation must have an oxygen failure alarm and a hypoxic guard that prevents delivery of a hypoxic gas mixture.
- The World Health Organization surgical safety checklist has three phases: Sign In before induction, Time Out before incision and Sign Out before the patient leaves theatre.
- The Sign In phase confirms patient identity, the surgical site, consent, allergies, the airway plan and the aspiration risk.
- Standard intraoperative monitoring includes pulse oximetry, non-invasive blood pressure, electrocardiography, capnography and temperature.
- Pulse oximetry and capnography are the two monitors most strongly linked to a fall in anaesthesia-related mortality.
- A trained assistant for the anaesthesiologist and immediate access to resuscitation drugs and equipment are core principles of safe anaesthesia.
- Informed consent for anaesthesia is separate from surgical consent and should cover the technique, common risks and postoperative pain relief.
- Anaesthetic drugs and controlled substances must be stored securely, checked against a register and never left unattended in theatre.
WHO surgical safety checklist
- **Sign In:** Before induction. Confirms identity, site, consent, allergies, airway and aspiration risk.
- **Time Out:** Before skin incision. Team introductions, confirmation of procedure, antibiotic and imaging check.
- **Sign Out:** Before the patient leaves theatre. Instrument and swab count, specimen labelling, recovery plan.
- **Core monitors:** Pulse oximetry, capnography, ECG, non-invasive blood pressure and temperature.
NMC competencies in this chapter
- **AS1.1:** Evolution of anaesthesiology as a modern specialty
- **AS1.2:** Roles and responsibilities of the anaesthesiologist
- **AS1.3:** Infrastructure, equipment and drugs for safe anaesthesia
- **AS1.4:** Principles of safe anaesthesia
Frequently Asked Questions
What is the triad of general anaesthesia?
Unconsciousness, analgesia and muscle relaxation, together with suppression of harmful autonomic reflexes. Modern practice usually delivers each component with a separate drug so doses can be titrated.
What does an anaesthesiologist do beyond the operating theatre?
The specialty covers perioperative care, critical care in the intensive care unit and the management of acute and chronic pain, so the anaesthesiologist works well beyond the operating list.
Why is the WHO surgical safety checklist important?
Its three phases, Sign In, Time Out and Sign Out, catch errors such as wrong site, missed allergies or a retained swab, and their use is linked to fewer surgical complications.
Which monitors are essential during anaesthesia?
Pulse oximetry, capnography, electrocardiography, non-invasive blood pressure and temperature. Pulse oximetry and capnography in particular have reduced anaesthesia-related mortality.
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