EXAM 2 Reading (N.Ch19) Flashcards Preview

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Flashcards in EXAM 2 Reading (N.Ch19) Deck (53)
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1
Q

Which of the following drugs would be most likely to affect the latency and amplitude of brainstem auditory evoked potentials (BAEPs)?

A

Sevoflurane

2
Q

BAEPs are not significantly affected by

A

benzodiazepines, ketamine, propofol, muscle relaxants, N2O, or barbiturate

3
Q

Inhalation agents can affect_____and the effect is_______

A

BAEPs and the effect is proportional to the dose administered.

4
Q

Which of the following would have the greatest effect on brainstem auditory evoked potentials?

A

Sevoflurane

5
Q

Motor evoked potentials using magnetic stimulation are contraindicated in patients who have ?

A

Pacemaker
Previous Craniotomy
SPinal/Bladder stimulator
Metallic FB

6
Q

Which evoked potential monitoring modality is specific to cranial nerve VIII and is particularly useful in acoustic neuroma surgery?

A

Brain auditory evoked potential

7
Q

Brain auditory evoked potentials evaluate the function of

A

cranial nerve VIII

8
Q

Useful in acoustic neuroma surgery.

A

Brain auditory evoked potentials

9
Q

Which of the following agents are least likely to alter the latency or amplitude of somatosensory evoked potentials? (select two)

A

Ketamine

Etomidate

10
Q

Most anesthetic agents will alter the latency or amplitude of somatosensory evoked potentials except for

A

opioids, ketamine, and etomidate.

11
Q

Which electroencephalogram (EEG) findings would be consistent with light anesthesia or profound surgical stimulation?

A

High frequency, low voltage activity

12
Q

Surgical stimulation or light anesthesia would display

A

high frequency, low voltage activity on the EEG monitor.

HFLV

13
Q

Which of the following agents will not produce a significant change in the latency or amplitude of somatosensory evoked potentials? (select two)

A

Fentanyl

Ketamine

14
Q

In normal doses, ketamine, etomidate, and opioids

A

do not produce a significant change in the latency or amplitude of somatosensory evoked potentials

15
Q

The administration of intravenous anesthetics in general anesthetic (not pain control) doses

A

the latency and amplitude of SSEPs will be affected, but not to the degree seen with inhaled anesthetics.

16
Q

The administration of muscle relaxants will not affect

A

somatosensory evoked potentials

17
Q

The administration of muscle relaxants interfere with

A

or completely block motor-evoked potentials.

18
Q

Inhaled anesthetics will DAIL

A

the latency and decrease the amplitude of somatosensory evoked potentials.

19
Q

When should the auditory transducer be placed when monitoring brainstem auditory evoked potentials?

A

After positioning of the head

20
Q

The BAEP transducer should be positioned after the head is positioned. This produces the best results, and also prevents

A

abrasive injury to the ear canal.

21
Q

Which evoked potential is useful in evaluating descending motor pathways?

A

Motor evoked potentials

22
Q

MEP assesses (think MD)

A

descending motor pathways

23
Q

BAEP, SSEP, and VEP give data about

A

ascending sensory neural pathways.

24
Q

Which diagnostic aid would most accurately reflect an interruption of ANTERIOR spinal cord perfusion in a patient undergoing surgery involving cross-clamping of the thoracic aorta?

A

Motor Evoked potentials. This test is not often used, however, because it precludes the use of muscle relaxants.

25
Q

Somatosensory evoked potentials (SSEPs) and EEG would be useful in assessing the but

A

central nervous system of a patient undergoing surgery,

26
Q

Neither assesses the integrity of the anterior spinal cord

A

SSEPs or EEG

27
Q

SSEPs assess the sensory pathways in the

A

dorsal spinal cord

28
Q

Cross clamping of the thoracic aorta, Right radial arterial line would be most appropriate for monitoring

A

pressures proximal to the clamp.

29
Q

An anesthetized patient undergoing neurologic surgery has a monitor in place that utilizes a stroboscopic flash with recording electrodes placed on the scalp. What intraoperative test is being performed?

A

Visual evoked potentials

30
Q

Which of the following tests would be most appropriate for testing neural integrity during posterior fossa surgery?

A

Brainstem auditory evoked potentials

31
Q

Somatosensory evoked potentials assess the

A

dorsal spinal column and sensory cortex

32
Q

SSEPs best for monitoring during

A

spinal surgery, carotid endarterectomy, and aortic surgery.

33
Q

Visual evoked potentials assess the integrity of the

A

optic nerve and upper brainstem and are best for monitoring during pituitary resection.

34
Q

Best for monitoring during pituitary resection:

A

VEPs

35
Q

The wake-up test assesses movement and evaluates the integrity of the

A

motor tracts in the ventral spinal column.

36
Q

Which type of visual evoked potential is performed on an awake patient?

A

Patterned VEPs

37
Q

During Visual Evoked Potentials (VEPs), the patient is presented

A

a visual stimulus for a select number of times, then the cerebral responses are dispayed after being amplified and averaged on a computer.

38
Q

There are two types of VEPs:

A

patterned and unpatterned.

39
Q

Patterned tests are used on

A

awake patients.

40
Q

Which intravenous agents would be most capable of producing burst suppression on the EEG? (select two)

A

Etomidate

Propofol

41
Q

2 only IV agents capable of BURST SUPPRESION on EEG

A

Etomidate

Propofol

42
Q

Which of the following conditions is known to produce increased latency in brainstem auditory evoked potentials?

A

Hypocapnia

43
Q

Low PCO2 (hypocapnia) on BAEPs

A

exaggerates BAEPs, resulting in an increased latency.

44
Q

Can result in increased latency and prolonged interpeak intervals

A

Hypothermia (not hyperthermia)

45
Q

What is the stimulus used in the monitoring of BAEPs?

A

A broadband, repeating click

46
Q

What is done during brainstem auditory evoked potentials?

A

A standard broadband repeating click that is delivered through an earphone that is placed in the auditory canal is used

47
Q

In which patient would motor-evoked potentials using magnetic stimulation be contraindicated?

A

A 55 year-old male with a bladder stimulator

48
Q

Are useful in the monitoring of functional integrity of motor tracts, namely, the corticospinal tract

A

Motor evoked potentials (MEPs)

49
Q

MEPs, The stimuli can be

A

magnetic or electrical, with either the spinal cord or the motor cortex used as the site of stimulation.

50
Q

Patients with spinal or bladder stimulators, metallic foreign bodies, pacemakers, or a previous craniotomy

A

should not undergo MEP via magnetic stimulation.

51
Q

Somatosensory evoked potentials are useful for

A

monitoring during a carotid endarterectomy

52
Q

Brainstem auditory evoked potentials are useful for monitoring this function ?

A

are useful for monitoring basic brainstem function

53
Q

Useful for monitoring basic brainstem function

A

Brainstem auditory evoked potentials