Lecture 14 - General Anesthetic Dog Sedation

Question 1

Lola is a “happy little dog” that has been presented for a spay after having been fasted for 12 hours. Present a problem list for Lola:

Answer 1

1. Hypotension
2. Hypoventilation
3. Hypothermia
4. Painful procedure
5. Recovery is painful
6. Recovery excitation
7. Behaviour – happy

Question 2

What are the three aims of the surgery for Lola?

Answer 2

1. Unconsciousness
2. GOOD analgesia
3. Muscle relaxation

Question 3

What drug should be given as premedication for Lola?

Answer 3

ACP and opoid (methadone in this case)

Question 4

What drug are we going to give to induce anaesthesia?

Answer 4

Propofol

Question 5

What items should be gathered in preparation for anaesthesia?

Answer 5

1. Cather – right size catheter, tape, disinfectant & clipper
2. Flush with 0.9% NaCl
3. Fluids and fluid set-up
4. Drugs – induction + top ups + emergency drugs
5. Monitoring – oesophageal stethoscope + other monitoring devices
6. Intubation: 3 ETT, lidocaine spray, laryngoscope, cuff syringe, tie
7. Anaesthetic machine

Question 6

What sized endotracheal tube should be used for Lola? and what other tubes should be have on the table?

Answer 6

Use endotracheal tube size 8 for Lola - also think about having 7 and 9 - we want to go up one and down one on our table

Question 7

What anesthetics can be used for the maintenance of anesthesia?

Answer 7

• Isoflurane and sevoflurane – gas anaesthetics that we can use
• Propofol – something that we can use if we did not have access to gas anaesthetic

Question 8

When using isoflurane what settings should be used to keep the animal asleep?

Answer 8

1.5% to 2% - setting of Isoflurane that should be used

MAC value for isoflurane is 1.3% - this is the minimum level however it can go up to 2% with a surgical stimulus

Question 9

During clipping a prepping Lola begins to wake up what steps could be taken?

Answer 9

Give a top up of propofol - need to give 1mg/kg of 1/10th of the induction dose.

Turning up the vaporizer would not work as it takes 10 minutes to get to the animals brain

Question 10

What drugs can be given to reduce the amount of isoflurane that is required in a surgery?

Answer 10

1. Methadone bolus
2. Fentanyl bolus
3. Medetomidine top up

Question 11

What drugs can be given for post-operative pain relief?

Answer 11

• Lidocaine and Bupivacaine – should be given intra-operatively
• Methadone, Buprenorphine, Butorphanol, Tramadol – can be given for intraoperative analgesia
• Carprofen and meloxicam – NSIAD’s