Anaesthetics Flashcards
Describe the ASA criteria
1= healthy patient
2= mild systemic disease (including diabetes and pregnancy)
3= severe systemic disease which is not a threat to life
4= severe systemic disease which is a threat to life
5= patient will die without the operation
6= Patient is brain dead & donating organs
Name the three antihypertensive medications that should be stopped before surgery
ACE inhibitors
Angiotensin receptor blockers
Aldosterone antagonist
What are the three components of a general anaesthetic
- Analgesia
- Hypnotic
- Muscle relaxant
Name two analgesic agents
- Fentanyl
- Alfentanil
Name two hypnotic agents
- Propofol
- Thiopentone
- Ketamine
Name 4 pieces of monitoring required for an anaesthetised patient
- Capnography
- ECG
- NIBP
- SpO2
What kind of pain do A-delta fibres convey?
sharp pain
Are A-delta fibres myelinated or unmyelinated?
Myelinated (fast impulses!)
What kind of pain do C fibres convey?
Dull, aching pain
Are C fibres myelinated or unmyelinated?
Un-myelinated (slow!)
What is pre-operative exercise tolerance measured in?
METS
What is the most common sequence of general anaesthesia?
is Intravenous induction followed by inhalational maintenance
What is used for inhalation maintenance of anaesthesia?
halogenated hydrocarbons
What is the difference between a spinal and an epidural?
Epidural= into epidural space. Can be done at any level. Higher doses of anaesthetic needed to achieve anaesthesia as nerve roots are thick
Spinal/subarach= directly into the CSF surrounding nerve roots. Administer at L1-L2. Less anaesthetic needed to achieve anaesthesia as direct contact with the nerve itself.
