MAC Values & Expected Responses

Question 1

1.0 mac →

Answer 1

prevents skeletal muscle movement in 50% of pts

Question 2

1.3 MAC →

Answer 2

Prevents skeletal muscle movement in 99% of pts

Question 3

0.3 - 0.5 MAC →

Answer 3

Eye opening
MACawake

Question 4

1.7 - 2.0 MAC →

Answer 4

Blunts autonomic reflexes
* prevents HR/BP or SNS response from stimulation
* don’t want this MACbar

Question 5

0.1 MAC →

Answer 5

• 50-70% decrease in hypoxic response

Question 6

0.25 MAC →

Answer 6

• ischemic preconditioning

Question 7

0.6 MAC

Answer 7

• increased CBF

Question 8

0.8 MAC →

Answer 8

• increased ICP

Question 9

0.5-1.0 MAC →

Answer 9

• decreased uterine smooth muscle tone

Question 10

At what MAC is Sevo autoregulation maintained until?

Answer 10

1 MAC

Question 11

At what MAC do all VA cause a depression in hypoxic response?

Answer 11

1.1 MAC

Question 12

At what MAC is autoregulation lost with Des & Iso?

Answer 12

0.5-1.5 MAC

Question 13

At what MAC do evoked potentials decrease in amplitude & increase in latency?

Answer 13

0.5 - 1.5 MAC

Question 14

At what MAC does burst suppression happen?

Answer 14

1.5 MAC

Question 15

At what MAC does Sevo cause reflex tachy?

Answer 15

1.5 MAC

Question 16

At what MAC do Iso, Des, & Sevo all increase portal vein flow?

Answer 16

• 1-1.5 MAC
• all are equal

Question 17

At what MAC does apnea occur?

Answer 17

1.5 - 2.0 MAC

Question 18

At what MAC is there electrical silence and 50% depression of HPV?

Answer 18

2.0 MAC