ELECTROCORTICOGRAPHY AND FUNCTIONAL

ELECTROCORTICOGRAPHY AND FUNCTIONAL

MAPPING FOR CLTM BOARD PREP ALL 100

QUESTIONS AND CORRECT ANSWERS (EXPERT

VERIFIED ANSWERS) CTLM BOARD PREP

EXAM 2024-2025 BRAND NEW!!

What is the clinical consequence of occluding the right jugular vein?

• Right brainstem stroke
• None of the choices are correct, blood may return through the left jugular vein
• Right hemispheric stroke
• Brainstem stroke - ANSWER-b. None of the choices are correct, blood may

return through the left jugular vein

Dr Paul Broca, a neurosurgeon in 1861, identified the area of expressive speech by:

• Studying laboratory animals
• Performing the first EP studies in humans
• Using direct cortical stimulation in surgery
• Following a patient with expressive aphasia and performing an autopsy after the

patient's death

• Combining results of CT, MRI, and fMRI - ANSWER-d. Following a patient

with expressive aphasia and performing an autopsy after the patient's death

Functional mapping with direct cortical stimulation should always be done with

concurrent electrocorticography:

True or False? - ANSWER-True

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What new imaging techniques help in the placement of ECoG electrodes?

• Ultrasound and standard X-Rays
• Contrast MRI and CT scans
• Digital photographs and MEG
• Fusion of functional SPECT and PET scans and structural MRI - ANSWER-d.

Fusion of functional SPECT and PET scans and structural MRI

How are afterdischarges stopped?

• IV valium
• General anesthesia
• IV antiepileptic drugs
• Irrigation using cold (4 degrees C) Ringer's applied directly to the cortex -

ANSWER-d. Irrigation using cold (4 degrees C) Ringer's applied directly to the cortex

Appropriate filter settings for ECoG are:

• 0.5 Hz to 35 Hz
• 0.5 Hz to 70 or 100 Hz
• 5 Hz to 60 Hz
• 1 Hz to 70 Hz - ANSWER-b. 0.5 Hz to 70 or 100 Hz

How does ECoG activity differ from scalp recorded EEG? (select all that apply) -More sharply contoured morphology -Lower amplitude when recording from the cortex directly -Higher amplitude 2 / 3

-Onset decrement or attenuation usually not seen on scalp recordings because it is so low amplitude it is not recorded through the scalp and skull - ANSWER--More sharply contoured morphology -Higher amplitude -Onset decrement or attenuation usually not seen on scalp recordings because it is so low amplitude it is not recorded through the scalp and skull

During surgery for an aortic arch dissection, the SSEP's from the lower extremities remain stable, EEG shows no change but there is a gradual loss of the SSEP and Tc-MEP from the left arm. What is the most likely etiology?

• Left side spinal cord injury
• Right cortical injury
• Right brainstem injury
• Occlusion of the left subclavian artery - ANSWER-d. Occlusion of the left

subclavian artery

Which of the following modalities is LEAST useful to monitor during surgery for a vertebral artery aneurysm?

• Lower extremity SSEP
• Brainstem auditory evoked potential
• Surface EEG
• Upper extremity SSEP - ANSWER-c. Surface EEG

Structural functional anatomy may be altered by: (select all that apply)

• Pressure
• Plasticity
• Current
• Previous lesions - ANSWER-a. Pressure
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