Neurologic

Question 1

Thalamus function?

Answer 1

Involved in coordinating sensory and motor signals to the cerebral cortex as well of regulation of sleep.

Question 2

Clinically significant changes when using SSEP ?

Answer 2

Decrease in amplitude of 50% or more or an increase in latency of more than 10%.

Question 3

Clinically significant changes when using an EEG?

Answer 3

Ipsilateral or bilateral appearance of increase theta or delta activity
Suppression of alpha or beta activity of more than 50% or both

Question 4

Epileptiform pattern with volatile anesthetics on the EEG

Answer 4

Isoflurane can be associated with isolated epileptiform patterns at 1.5 to 2.0 Mac but is not associated with Frank seizures.
Sevoflurane shows a similar pattern
Frank seizure activity has been seen in patients who are hyperventilated and receiving more than to Mac and Enflurane.

Question 5

The correct order of sensitivity of sensory evoked potential’s to the effects of volatile anesthetics is

Answer 5

(From most sensitive to least sensitive )

1) visual evoked potentials
2) somatosensory evoked potentials and 3) brain stem Auditory evoked potentials.

Question 6

Effect of Etomidate on SSEP ?

Answer 6

Increases latency and Amplitude

Question 7

Effect of Ketamine on SSEP?

Answer 7

Increases amplitude