Key result
Gender differences significantly influenced the maximum mean blur rate (r = -0.31), whereas aging significantly influenced the minimum mean blur rate (r = -0.24) in the optic nerve head microcirculation of healthy adults.
Why the study?
Potential differences in the nature of the influences of aging and gender on optic nerve head microcirculation using laser speckle flowgraphy required evaluation.
Do gender and aging differentially influence the maximum, minimum, and average optic nerve head microcirculation parameters in healthy adults?
Cross-Sectional (n=908)
No
Do gender and aging differentially influence the maximum, minimum, and average optic nerve head microcirculation parameters in healthy adults?
Effect estimate: r = -0.31
p-value: p=<0.0001
Gender differences primarily influence the maximum mean blur rate (MBR) in the optic nerve head, whereas aging primarily influences the minimum MBR, highlighting the need to evaluate these parameters separately rather than relying solely on average MBR.
Gender and age effects on optic nerve head microcirculation warrant longitudinal studies; leaves open relevance to glaucoma risk assessment.
Potential differences in the nature of the influences of aging and gender on the optic nerve head (ONH) microcirculation, using laser speckle flowgraphy (LSFG) were evaluated. We studied 908 healthy subjects (men = 701, age: 50.0 ± 9.1 yrs, women = 208, 49.8 ± 9.5 yrs, p = 0.76). The average, maximum (Max), and minimum (Min) mean blur rate (MBR) in a heartbeat were evaluated. The parameters were analyzed separately for the tissue, vessels, and throughout the ONH (All). We investigated which MBR sections are correlated with gender and age by univariate and multivariate regression analyses. The Max MBR-All (r = -0.31) was most strongly correlated with gender (men = 1, women = 0). The Min MBR-All (r = -0.24) was most strongly correlated with age, followed by Min MBR-All (r = -0.20). The factors contributing independently to the Max MBR-All were gender (β = -0.15), pulse pressure, spherical refraction, ocular perfusion pressure, and red blood cell (RBC) count. The factors contributing independently to the Min MBR-Vessel were gender (β = -0.09), age (β = -0.25), body mass index, heart rate, and spherical refraction. The factors contributing independently to the Min-MBR-All were age (β = -0.22), heart rate, and RBC count. Our results revealed that gender differences influence the Max MBR, and aging influences the Min MBR. These correlations were stronger than that of average MBR.
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Kobayashi et al. (2019) conducted a cross-sectional in Healthy adults (n=908). Gender and aging was evaluated on Correlation of maximum mean blur rate throughout the optic nerve head (Max MBR-All) with gender (r = -0.31, p=<0.0001). Gender differences significantly influenced the maximum mean blur rate (r = -0.31), whereas aging significantly influenced the minimum mean blur rate (r = -0.24) in the optic nerve head microcirculation of healthy adults.
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