Exam Solution Manual for Intracranial Cerebral Evaluation Latest Update Graded A+
What is cerebral circulatory arrest? - Answers Cessation of oxygenated blood circulation to the brain.
What is a cerebral thrombectomy? - Answers Endovascular mechanical thrombectomy used during ischemic stroke due ...
What is cerebral circulatory arrest? - Answers Cessation of oxygenated blood circulation to the brain.
What is a cerebral thrombectomy? - Answers Endovascular mechanical thrombectomy used during
ischemic stroke due to large vessel occlusion.
What is cerebral vascular reactivity? - Answers A change in cerebral blood flow in response to a
vasoactive stimulus.
What is the Circle of Willis? - Answers A roughly circular anastomosis of arteries located at the base of
the brain.
What is a collateral? - Answers A vessel that maintains blood flow via a secondary route for a stenotic or
occluded vessel.
What is an emboli? - Answers Microparticles circulating in the blood consisting of thrombi, platelet
aggregates, or gas, which can be detected by Doppler ultrasound.
What is the Lindegaard Ratio? - Answers Middle cerebral artery (MCA) mean velocity divided by the
submandibular internal carotid artery (ICA) mean velocity. This ratio is useful in differentiating increased
volume flow from decreased diameter when high velocities are encountered in the MCA or intracranial
ICA.
What is pulsatility? - Answers Expressed as Gosling's pulsatility index (peak systolic velocitv minus end-
diastolic velocity divided by the time-averaged peak velocity).
What is sickle cell disease? - Answers Disorders of hemoglobin, the molecule in red blood cells that
delivers oxygen to cells, which distort the RBCs into a sickle shape.
What is the sviri ratio? - Answers Ratio calculation used to determine vasospasm from hyperdynamic
flow in the posterior circulation. The bilateral vertebral artery velocities taken at the atlas loop are
added together and averaged. This averaged velocity is then divided into the highest basilar mean
velocity.
What is transcranial doppler? - Answers A noninvasive test that uses ultrasound to measure the velocity
of blood flow through the intracranial cerebral vessels.
What is transcranial duplex imaging? - Answers A noninvasive test on the intracranial cerebral blood
vessels that uses ultrasound and provides both an image of the blood vessels and a graphic display of
the velocities within the vessels.
What is a vasospasm? - Answers A sudden constriction in a blood vessel, causing a restriction in blood
flow.
What is the range of the average diameter of basal cerebral arteries? - Answers 2-4 mm
, It is estimated that 18% to 54% of individuals display variations at the level of the circle of Wil-lis. Which
of the following is NOT one of these variations? - Answers Variation of number of arteries
Which statement about the anterior cerebral arteries is false? - Answers Both arteries (right and left) are
frequently identical
What is the term used when the posterior cerebral arteries depend on the internal carotid artery for
blood flow (at least partly)? - Answers Fetal origin of the PCA
What is the optimal patient position for evaluation of the vertebral and basilar arteries through the
foramen magnum? - Answers Lateral decubitus with head tilted inferiorly
Which of the following is a typical characteristic of a no imaging transducer for transcranial doppler? -
Answers 1-2 MHz pulsed wave
What is the doppler frequency range in standard duplex imaging system for transcranial imaging? -
Answers 2-3 MHz
What is the initial target vessel to be explored through the trans temporal acoustic window? - Answers
MCA
What do the Lindegaard and the BA/VA ratios help categorize? - Answers Vasospasm
What does the relation MCA > ACA > PCA = BA = VA represent? - Answers Relative flow velocities
Which of the following is not a criterion used for the identification of vessels or vessel segments in the
intracranial circulation? - Answers The diameter of the vessel
Which imaging technique creates a display that demonstrates flow intensity and direction in bands of
color at multiple depths, creating a "road map" to follow signals from vessels? - Answers Power M-mode
Which of the following is NOT a primary diagnostic feature of the doppler signals for evaluation of
intracranial vessels? - Answers Changes in vessel diameters from established criteria
Which characteristic is NOT part of the five primary criteria used to identify intracranial arterial
segment? - Answers Pulsatility index
A limited transcranial Doppler or transcranial duplex imaging exam could be ordered for all the following
EXCEPT what? - Answers Evaluate for sickle cell anemia
Which statement regarding the use (and advan-tages) of audio signals during TCD and TCDI is
FALSE? - Answers TCDI does not have audio capability
Which of the following is the atlas loop approach used for? - Answers Obtaining data to characterize
basilar artery vasospasm
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