Impact Of Brachial Bifurcation On Endothelial-dependent And Independent Vasodilation: A Case Study
Bibliographic record
Abstract
Brachial artery flow-mediated dilation (FMD) is a common measure of endothelial function. Anatomical variations of the brachial artery (e.g., unilateral dual-brachial arteries) have been documented in ~5-10% of cadavers post-mortem, but our understanding of endothelial or vascular smooth muscle cell function in these rare cases is unknown. Investigating these rare arterial anomalies may provide unique opportunities to further knowledge on arterial function. PURPOSE: To determine FMD and endothelial-independent vasodilatory responses between a bifurcated versus non-bifurcated brachial artery. METHODS: A 28-year healthy female presenting with a double right brachial artery [right superficial brachial artery (RSBA), right deep brachial artery (RDBA)], but a non-bifurcated left brachial artery (LBA) was examined. Duplex ultrasonography was used to perform endothelial-dependent and -independent vasodilation assessments via the FMD and nitroglycerin-mediated dilation (NMD, 0.4 mg sublingual spray) techniques, respectively. Absolute (mm) and relative (% baseline) changes in diameter were calculated for FMD and NMD. The shear rate area under the curve (SRAUC) between distal cuff deflation and the peak FMD response was also calculated. RESULTS: The RSBA and RDBA split at the axilla and converged at the antecubital fossa. Baseline lumen diameters were similar between the intact LBA (2.92 mm) and the RSBA (3.05 mm), but the RDBA was smaller (2.04 mm). However, the SRAUC responses were similar between arteries (RSBA = 11455 au, RDBA = 10904 au, LBA = 12254 au). Absolute and relative FMD were lower in the bifurcated artery (RSBA = 0.10 mm, 3.5%; RDBA = 0.09 mm, 4.2%) compared to the intact LBA (0.22 mm, 7.6%). Similar observations were note for absolute NMD (RSBA = 0.42 mm, RDBA = 0.47 mm, LBA = 0.62 mm), but not relative NMD (RSBA = 13.3%, RDBA = 24.9%, LBA = 21.3%). CONCLUSIONS: Unilateral bifurcation of the brachial artery promotes lower endothelial-dependent vasodilation in the bifurcated vessels relative to the intact contralateral artery. Compared to an intact brachial artery, unilateral bifurcation was associated with reduced vascular smooth muscle sensitivity to exogenous nitric oxide in the RSBA (absolute + relative NMD responses), and in the RDBA (absolute NMD only), compared to the intact LBA.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.001 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.005 | 0.004 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".