Miscellaneous Monitors & Radiology

Question 1

What percentage of receptors may still be blocked with a ToF of 0.9?

Answer 1

75%

Question 2

At what percent blockade is T1of a ToF lost?

Answer 2

90-95% blockade

Question 3

At what point is T2-T3 lost?

Answer 3

85-90%

Question 4

At what point is T4 lost?

Answer 4

80-85%

Question 5

Does cerebral oximetry measure regional or global oxygenation?

Answer 5

Regional

Question 6

What degree of change is concerning in cerebral oxygenation?

Answer 6

> 25%

Question 7

Cerebral oximetry uses ______ to measure oxygenation

Answer 7

Near infrared spectrometry (NIRS)

Question 8

What percentage of blood in the brain is venous?

Answer 8

Almost 75%!

Question 9

NIRS primarily measures:

Answer 9

venous oxygenation and oxygen consumption. Not arterial. It can’t detect pulsatile flow.

Question 10

During anesthesia, EEG waves change in two ways:

Answer 10

They become slower (lower frequency)

The become taller (higher amplitude)

Question 11

Which anesthetic increases EEG beta waves?

Answer 11

ONLY Nitrous

Question 12

Is etomidate associated with epileptiform activity?

Answer 12

NO

Question 13

Unilateral burst suppression is suggestive of:

Answer 13

Cerebral ischemia

Question 14

Isoelectricity occurs at:

Answer 14

1.5-2 MAC

Question 15

Answer 15

Question 16

Light anesthesia is associated with ________ wave activity

Answer 16

beta

Question 17

______ and _____ waves predominate during general anesthesia

Answer 17

theta and delta

Question 18

The development of _______ during anesthesia may indicate cerebral ischemia

Answer 18

new delta

Question 19

Which circumstances mimic ischemia on an EEG?

Answer 19

Deep anesthesia
HYPOcarbia
HYPOthermia

Question 20

The accuracy of BIS monitoring is effected by:

Answer 20

Increased muscle tone
Encephalopathy
Ketamine

Question 21

What is the target range for anesthesia with the Patient State Index (PSI)?

Answer 21

25-50

Question 22

The LIM alarms if:

Answer 22

the sum of all leak currents exceeds 2-5 mA

Question 23

The isolation transformer sits between:

Answer 23

the power company and the OR