RIU 436 Lecture Notes - Lecture 44: Thrombolysis, Embolism, Brain Death
18 Aug 2020
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Spectral waveforms are primarily used for diagnosis. Wide range of normal values affected by many variables. Can assist in how to move to acquire stronger signal. Sample value should be large, resulting in spectral broadening in all. Tap-v or mean velocities are typically measured and reported. Additional waveform considerations include pi and waveform morphology. All vessels, except oa, have low resistance with relatively high diastolic waveforms flow. Mean velocity in the mca/ mean velocity in ipsilateral extracranial internal carotid artery. Mean velocity of the basilar artery/ mean velocity of vertebral artery. Time averaged peak velocity (tap-v) aka time average maximum velocity (tamax) Tcd is useful for detection of > 50% intracranial stenoses and occlusions. Moyamoya disease- japanese for puff of smoke which describes the tangle of collateral vessels at the base of he skull from occluded circulation to the basal ganglia. Atherosclerosis is the most common cause of intracranial stenosis. Affects cavernous ica, mca, aca, va, ba, and pca.
