Real‐Time Hemodynamic Assessment of Intracranial Stenosis in a Patient with Orthostatic Aphasia: Potential Applications of Transcranial Doppler
Bibliographic record
Abstract
BACKGROUND: Intracranial atherosclerotic stenosis is thought to be responsible for 8% of all ischemic stroke subtypes. Transcranial Doppler (TCD) ultrasonography allows for noninvasive and dynamic evaluation of the cerebral circulation within the circle of Willis. We present a case of recurrent, orthostatic transient ischemic attacks in which, using TCD, we were able to correlate dynamically between the orthostatic symptomatology and a significant drop in the mean flow velocity (MFV) across the stenotic middle cerebral artery (MCA) segment. METHODS: A 56-year-old male presented with recurrent episodes of orthostatic right-sided weakness and expressive aphasia. Diagnostic TCD revealed a stenotic signal in the left internal carotid artery (ICA) siphon. Subsequent TCD monitoring of both MCAs demonstrated a significant orthostatic drop in MFV of the left MCA, which closely correlated with his symptoms. The cerebral angiogram confirmed a high-grade stenosis at the supraclinoid segment of the left ICA. CONCLUSION: TCD is a useful, noninvasive, and dynamic tool for assessment of the intracranial circulation, and should be considered in the workup of patients with hypoperfusion cerebrovascular events.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".