Injectable Anaesthetics Flashcards
What are the 3 things general anaesthesia is characterised by?
- Lack of pain
- Lack of memory
- Relatively depressed reflex responses
Explain balanced anaesthesia
patient pre-medicated with sedative and analgesic, given analgesic during and after surgery, maintained on inhalation agent to provide narcosis
What are the two types of anaesthetics?
Injectable
Inhalational
Name 2 reasons to use injectable anaesthetics?
- Induction prior to inhalational anaesthetics
- Sole agent for short duration procedures
- Supplement inhalational agents
- Suppress central nervous system stimulation in certain conditions
Name 2 routes of administration for injectable anaesthetics?
- I/V
- I/M
- S/C
- I/P
Name 2 things you should consider when choosing an admin route
effect
absorption
need for restraint
pain on injection
What does TIVA stand for
total intravenous anaesthesia
What is TIVA an alternative to?
Gaseous anaesthetic
Name 2 benefits of TIVA
- Avoids side effects of inhalational agents
- Useful when inhalational delivery would compromise access for surgery
What impacts the effects of I/V anaesthetic agents
concentration of plasma
When will unconsciousness occur
when brain reaches a critical concentration of the drug
When will consciousness begin to return
Drug level falls below critical level and less well-perfused organs start to take up the drug
What causes a variation in duration of action by injectable anaesthetics
- redistribution o drug from brain to less well-perfused tissues vary depending on:
1. Cardiac output
2. the mass of tissues available
Where are injectable anaesthetics metabolised
liver
What sites can be used for I/M administration?
- Quadriceps
- Lumbo-dorsal muscles
- Lateral Neck
