Accuracy and precision of a new portable ultrasound scanner, the BME-150A, in residual urine volume measurement: a comparison with the BladderScan BVI 3000

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This study compared the BME-150A portable ultrasound to the BladderScan BVI 3000 for measuring residual urine volume and found comparable accuracy between the devices.

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The paper assessed the relative accuracy and precision of a new portable ultrasound scanner (BME-150A) versus the BladderScan BVI 3000 for measuring residual urine volume, using catheterized post-scan residual urine volume as the reference. In 89 patients (116 paired measurements) undergoing urodynamic studies, both ultrasound devices were used in the supine position and imaging was followed by immediate in-and-out catheterization within 5 minutes. The scanners correlated well with catheterized residual urine volumes (0.92 for BME-150A and 0.94 for BVI 3000) with mean differences of 7.8 ml and 3.6 ml, and the difference in accuracy between models was not significant; a limitation noted by the authors was that falsely elevated ultrasound residual volumes occurred in some cases, with large discrepancies. Relevance to endometriosis: in the reported cases of falsely elevated post-void residuals, uterine adenomyosis was diagnosed on pelvic ultrasonography, though the paper’s main focus is ultrasound accuracy for residual urine volume measurement.

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Abstract

The objective of the study was to determine the relative accuracy of a new portable ultrasound unit, BME-150A, and the BladderScan BVI 3000, as assessed in comparison with the catheterized residual urine volume. We used both of these machines to prospectively measure the residual urine volumes of 89 patients (40 men and 49 women) who were undergoing urodynamic studies. The ultrasound measurements were compared with the post-scan bladder volumes obtained by catheterization in the same patients. The ultrasounds were followed immediately (within 5 min) by in-and-out catheterizations while the patients were in a supine position. There were a total of 116 paired measurements made. The BME-150A and the BVI 3000 demonstrated a correlation with the residual volume of 0.92 and 0.94, and a mean difference from the true residual volume of 7.8 and 3.6 ml, respectively. Intraclass correlation coefficients for the accuracy of the two bladder scans were 0.90 for BME-150A and 0.95 for BVI 3000. The difference of accuracy between the two models was not significant (p = 0.2421). There were six cases in which a follow-up evaluation of falsely elevated post-void residual urine volume measurements on the ultrasound studies resulted in comparatively low catheterized volumes, with a range of differences from 66 to 275.5 ml. These cases were diagnosed with an ovarian cyst, uterine myoma, or uterine adenomyosis on pelvic ultrasonography. The accuracy of the BME-150A is comparable to that of the BVI 3000 in estimating the true residual urine volumes and is sufficient enough for us to recommend its use as an alternative to catheterization.
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Abstract

The objective of the study was to determine the relative accuracy of a new portable ultrasound unit, BME-150A™, and the BladderScan™ BVI 3000, as assessed in comparison with the catheterized residual urine volume. We used both of these machines to prospectively measure the residual urine volumes of 89 patients (40 men and 49 women) who were undergoing urodynamic studies. The ultrasound measurements were compared with the post-scan bladder volumes obtained by catheterization in the same patients. The ultrasounds were followed immediately (within 5 min) by in-and-out catheterizations while the patients were in a supine position. There were a total of 116 paired measurements made. The BME-150A and the BVI 3000 demonstrated a correlation with the residual volume of 0.92 and 0.94, and a mean difference from the true residual volume of 7.8 and 3.6 ml, respectively. Intraclass correlation coefficients for the accuracy of the two bladder scans were 0.90 for BME-150A and 0.95 for BVI 3000. The difference of accuracy between the two models was not significant (p = 0.2421). There were six cases in which a follow-up evaluation of falsely elevated post-void residual urine volume measurements on the ultrasound studies resulted in comparatively low catheterized volumes, with a range of differences from 66 to 275.5 ml. These cases were diagnosed with an ovarian cyst, uterine myoma, or uterine adenomyosis on pelvic ultrasonography. The accuracy of the BME-150A is comparable to that of the BVI 3000 in estimating the true residual urine volumes and is sufficient enough for us to recommend its use as an alternative to catheterization. Similar content being viewed by others Abbreviations - PVR: - post-void residual urine volume - BMI: - body mass index

References

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adenomyosis

MeSH descriptors

Endosonography Urinary Bladder Urinary Retention Adolescent Adult Aged Aged, 80 and over Body Mass Index Child Child, Preschool Endosonography Female Humans Male Middle Aged Prospective Studies Reproducibility of Results Sensitivity and Specificity Urinary Bladder Urinary Catheterization

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