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Bladder volume estimation in the elderly using a portable ultrasound-based measurement device
A K Topper1, P J Holliday, G R Fernie
1Centre for Studies in Aging, Sunnybrook Health Science Centre, Toronto, Ontario, Canada.
Journal of Medical Engineering & Technology
|May 1, 1993
Summary
The BladderScan BVI 2000 shows significant correlation but notable mean differences in bladder volume measurements for geriatric patients. Accuracy needs context-dependent evaluation, not just correlation.
Area of Science:
- Geriatric Medicine
- Medical Device Technology
- Diagnostic Ultrasound
Background:
- Accurate bladder volume measurement is crucial for geriatric care.
- Portable ultrasound devices like BladderScan offer potential for non-invasive assessment.
- Ease of use and accuracy in real-world clinical settings require validation.
Purpose of the Study:
- To evaluate the accuracy and ease of use of the BladderScan (BVI 2000) device.
- To assess the device's performance in a geriatric outpatient population.
- To identify areas for improvement in device algorithms and user interface.
Main Methods:
- A geriatric outpatient population (36 subjects) was studied.
- Nurses and physicians performed 73 BladderScan measurements each.
- Measurements were compared against true bladder volumes.
Main Results:
- Highly significant correlation coefficients were found between true and ultrasound measurements.
- However, mean differences between estimated and true volumes were statistically significant.
- Users encountered difficulties with the imaging and selection process.
Conclusions:
- Correlation coefficients alone are insufficient to describe BladderScan accuracy.
- Accuracy requirements should be a function of estimated versus true bladder volume, tailored to clinical decision-making.
- Improvements in automated signal processing and volume calculation algorithms are recommended.