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Flashcards in Anesthsia Deck (14):
1

Anesthesia

Total loss of sensation in part or entire body

Anesthetic agents
• produce loss of consciousness & induce absence of motor response to noxious stimuli

2

Basal anesthesia

Light level of general anesthesia produced by
pre-anesthetic agents

3

General anesthesia

Loss of consciousness & sensation thru-out the body.
• CONTROLLED & REVERSIBLE CNS depression

4

Surgical anesthesia

Loss of consciousness & sedation w/ sufficient muscle relaxation & analgesia to allow surgery to be performed w/o pain

5

Dissociative anesthesia

CNS state characterized by muscular rigidity, peripheral analgesia & altered consciousness

6

Principles of anesthesia vs analgesia

Anesthesia
• should coincide w/ expected duration of procedure

Analgesia
• should coincide w/ expected duration & intensity of Post-op pain generated by procedure

7

What factors help decide an anesthetic regimen?

1. type of procedure
2. Duration of procedure
3. amt & type of pain
4. Animal's characteristics
5. Drug properties

8

How are anesthetics dosed?

No predetermined anesthetic dose
• first estimate based on BW & age
• give drug until effect (may be delayed)
• calculated based on the metabolic size

Side effects
• Monitor & maintain body temp!
• rehydrate (IV)

9

Goal of pre-anesthesia

• Minimize anxiety/excitement
• Ease transition btwn Stage 1 & Stage 3
- stage 2 = delirium
• ↓ amt of anesthetic agent
• prevent vomiting

10

Pre-anesthetic drug classes

1. Anticholinergic
2. Opioids
- ↓ dose of anesthetic needed
- induces smooth recovery
- PAIN relief
3. Tranquilizer/sedative
- Need time to work!!
- ↓ dose of anesthetic needed -w/ ↓ side effects

11

Injectable anesthetics

Given IV
- except for small rodents - IP w/ diluted drug

• Barbiturates
• Non-barbiturates
• Dissociatives

12

Inhalation or volatile anesthetics

• used for long & major procedures
• Requires scavenger system, nose cone, or endotracheal tube
• calibrated vaporizer if LA's -- prevent overdose

** cannot contact anesthetic in liquid form!!

13

Stages of General anesthesia

Stage 1: (analgesia)
• Loss of pain w/o loss of consciousness

Stage 2: (delirium)
• Dangerous period

Stage 3: (Sx stage(
• Plane 1: light sx
• Plane 2: moderate sx
• Plane 3: Deep sx
• Plane 4: Excessive Sx - Intercostal paralysis, short gasping inspiration

Stage 4: ( medullary depression)
• respiratory paralysis to circulatory failure

14

When does recovery period end w/ anesthesia

when animal is fully awake