Introduction

Welcome to plain white scrubs, a page where ill be sharing my medical notes. I hope we could all benefit from it and i value your comments for improvement of this page

Sunday

General Anaesthesia

General anesthesia (anaesthesia)

State of unconsciousness and loss of protective reflexes resulting from administration of 1 or more general anesthesia agent.

Theories of general anesthesia (put in simple term)


1. Lipid theory - Decrease membrane permeability -> interfere with brain function -> LOC

2. Ion channel theory - Effect brain's ion channel (Na+,K+) ->  interfere with brain function -> LOC

3. Receptor theory - Increase GABA effect -> interfere with brain function -> LOC

Stages of anesthesia


1. Sedation - administration of agent till LOC
2. Excitement - LOC till loss of eyelid reflex
3. Surgical Anesthesia - loss of eyelid reflex till respiratory depression
4. Overdose - respiratory depression - death

Components in GA

1. Loss of consciousness - The use of either intravenous or volatile (gas) GA agent
2. Muscle relaxant - Non depolarizaing / Depolarizing
3. Analgesia - Opioid

General anesthesia agent


- To be continued-


1. IV agent

- Barbiturate: thiopental
- Benzodiazepam: midazolam
- Phenol: Propofol
- Steroid: Ethomidate
- Imine: Ketamine

2. Volatile agent


- Sevoflurane
- Isoflurane
- Desflurane
- Halotane
- Enflurane

Muscle relaxant agent

1. Depolarizing

Suxamethonium

2. Nondepolarizing

Atracurium
Rucororium

Analgesia


Opioid

Reversal agent


Neostigmine
Atropine

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