Key result
Diameter and blood flow velocities showed significant negative correlations in carotid arteries (-0.115 ≥ r ≥ -0.382) but positive correlations in vertebral arteries (0.211 ≤ r ≤ 0.320).
Cross-Sectional (n=176)
The relationship between vessel diameter and flow velocity differs between carotid (negative correlation) and vertebral (positive correlation) arteries in stroke patients, suggesting different adaptive processes.
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Findings should not yet change stroke management; leaves open vessel-specific hemodynamic adaptations requiring prospective study.
BACKGROUND: Chronic changes in flow rate through arteries produce adjustment of arterial diameters. We compared the relationship between flow velocity and diameter in the carotid and in the vertebral arteries of stroke patients. METHODS: Using triplex ultrasonography, the internal diameter and flow velocities of the common carotid, internal carotid, and vertebral arteries of 176 consecutive stroke patients were measured. Correlations were examined with Pearson's statistics at an alpha level of 0.05. RESULTS: Mean age of the patients was 59.3 ± 12 years, and 66% had cerebral infarcts. Diameter and blood flow velocities showed significant negative correlations (-0.115 ≥ r ≥ -0.382) in the carotid arteries on both sides, but positive correlations (0.211 ≤ r ≤ 0.320) in the vertebral arteries, even after controlling for age, gender, and blood pressure. CONCLUSIONS: Our study demonstrated different diameter/flow relationships in the carotid and the vertebral arteries of stroke patients, which may suggest pathologic changes in the adaptive processes governing vessel diameter and growth, especially in the carotid arteries.
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Owolabi et al. (2013) conducted a cross-sectional in stroke (n=176). Flow velocity was evaluated on Correlation between internal diameter and flow velocities (carotid: -0.115 ≥ r ≥ -0.382; vertebral: 0.211 ≤ r ≤ 0.320, p=<0.05). Diameter and blood flow velocities showed significant negative correlations in carotid arteries (-0.115 ≥ r ≥ -0.382) but positive correlations in vertebral arteries (0.211 ≤ r ≤ 0.320).
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