Purpose
To characterize ultrasound bladder measures, and to determine if these measures were associated with Measures of lower urinary tract dysfunction.
Methods
Three-dimensional ultrasounds were used to assess bladder surface area (SA), bladder wall thickness (BWT), and estimated bladder weight (EBW) in a random sample of the Olmsted County, Minnesota male population. Uroflowometry was used to determine maximum urinary flow rates, and ultrasound was used to assess post-void residual volume. Prostate volume was assessed with transrectal ultrasound and prostate specific antigen (PSA) levels were assessed from serum samples. Correlation and linear regression analyses assessed relationships between bladder measures and prostate volume, PSA, maximum flow rate, and post-void residual.
Results
Among 259 men, median bladder SA was 228 cm2 (25th, 75th percentiles: 180, 279), median BWT was 2.3 mm (25th, 75th percentiles: 1.8, 2.7), and median EBW was 48.5 g (25th, 75th percentiles: 43.7, 53.0). Decreased bladder SA was correlated with increased PSA level, increased prostate volume, higher AUASI scores (rs=-0.13 to -0.21; p values=0.03 to 0.001), and decreased maximum flow rate (rs=0.21, p=0.001). Increased BWT was correlated with increased PSA level (rs=0.22, p=0.0003), increased prostate volume (rs=0.17, p=0.01), and decreased maximum flow rate (rs=-0.14, p=0.03). EBW was correlated with increased maximum flow rate (rs=0.14, p=0.03), and decreased AUASI score (rs=-0.13, p=0.04).
Conclusions
Decreased SA and EBW were modestly associated with decreased maximum flow rate and increased AUASI scores, suggesting that such measures may provide insight into detrusor dysfunction.