Key result
Although there was significant variance in absolute velocity measurements among 15 vascular scientists (ANOVA p < 0.05), no single operator consistently produced highly variable results (p = 0.569).
Population
15 vascular scientists across four hospital Trusts in the Bristol, Bath and Weston vascular network…
Design
Cross-sectional, Double blind assessment of spectral Doppler images by two…
Authors
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Operator variability in carotid velocities warrants caution in serial clinical measurements; leaves open need for standardized protocols in research.
Cross-Sectional (n=15)
Double-blind
Yes
p-value: p=<0.05
Despite significant variance in absolute velocity measurements likely due to biological variability, vascular scientists were generally consistent in obtaining optimal spectral Doppler traces, highlighting the challenges of standardizing carotid ultrasound measurements.
McKenna et al. (2018) conducted a cross-sectional in Carotid artery disease (diagnostic variability) (n=15). Carotid artery duplex ultrasound measurement by different operators vs. Intra- and inter-operator comparisons was evaluated on Intra- and inter-operator variability in peak systolic velocity (PSV) and end diastolic velocity (EDV) (p=<0.05). Although there was significant variance in absolute velocity measurements among 15 vascular scientists (ANOVA p < 0.05), no single operator consistently produced highly variable results (p = 0.569).
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