Recording urinary flow and lower urinary tract symptoms using sonouroflowmetry.

INTRODUCTION

To assess the accuracy of sonouroflow (SUF), an at-home, wireless-based acoustic system for recording lower urinary tract symptoms (LUTS) and urinary flow rate, and to compare test-to-test variability in flow parameters recorded using this new portable method with those obtained by conventional uroflowmetry.

MATERIALS AND METHODS

An initial pilot study evaluated the technical feasibility of the SUF system. Subsequently, test-to-test variability was compared between sonourograms (SUFm) and standard uroflowmetry recordings. Uroflowmetry tests were performed at the urology office at pre-set times. SUF tests were performed at home on a schedule in keeping with the subjects' normal habits.

RESULTS

In the initial feasibility study, 94% of SUFm recordings obtained from male volunteers displayed regular bell-shaped flow curves comparable to those recorded by standard uroflowmetry; significant variability was noted among female volunteers. In the comparative study, the coefficient of variation for SUFm-derived values was significantly lower for voiding time (p < 0.001) and significantly higher for average flow rate (p = 0.009) than that obtained from standard uroflowmetry recordings; maximum flow rate and time to maximum flow were not significantly different between methods. Box-and-whisker plots showed reduced test-to-test variability in the SUFm dataset for voiding time, maximum flow rate and time to maximum flow rate in 62.5%, 43.75% and 56%, respectively, of study subjects.

CONCLUSIONS

The SUF system is easy to use and yields results comparable to those of standard uroflowmetry. Integration of recordings of LUTS with flow parameters and lower test-to-test variability suggest the potential of SUF for clinical applications.