Development of a Reliable Instrument for Recording and Analyzing Uroflow Procedures that includes the Liverpool
(Haylen, et al) Nomograms
A. C. COATS, M.D.
Life-Tech, Inc., Houston, Texas, USA
Summary—The science of analysis of Uroflow recordings has been described at length by the International Continence Society (ICS) and in numerous publications by leading clinicians in 1,2,3the field of Urology in recent years. The clinical research demonstrated a need for a reliable device for the documentation and analysis of uroflow results that included the “gold standard” Liverpool Nomograms.
?The Microflo (Life-Tech, Inc., Houston, TX, values. The highly advanced load cell USA) was developed to provide clinicians with a technology provides superior accuracy while highly accurate system for the recording and minimizing maintenance and operating cost. The analysis of Uroflow procedures, to include the system is found to be both economical and easy diagnostic reference plotting of the patient on the to operate (Figure 1).
Liverpool Uroflow Nomograms. The system Data analysis is automatic and provides for the features a high performance microprocessor, manual entry of patient information while collecting data at 8 samples per second while printing age, sex, position and the Uroflow digitally displaying the pattern. The system’s sophisticated algorithms automatically analyze the Uroflow study while virtually eliminating artifacts. High resolution
Uroflow recording is automatically printed in the
appropriate time scale of 0-60 sec., 0-120 sec., or
0-180 sec. (Figures 2 and 3).
Microflo retains in memory the last recorded
Uroflow and with subsequent printout the
scale can be changed from 0-50 ml/sec. to 0-
25 ml/sec. to improve the resolution of
abnormal Uroflow waveforms. Figure 1: Microflo 2001N.
Figure 2: Microflo Patient Information and analysis result.
1 Copyright ? 2000 Life-Tech, Inc.. All rights reserved.
Figure 3: Microflo Uroflow tracings.
Figure 4: Microflo with Liverpool Nomograms.
software package, and are drawn upon as Perhaps the most important feature of Microflo is
necessary to plot patient percentile of normality. the automatic plotting of the patient’s Uroflow
results on the Liverpool Nomograms. These 1 Abrams, P., Blaivas, J., Stanton, S., and Andersen, Nomograms are considered world-wide to be the
J. (1988), Standardisation of Terminology of “gold standard” of Uroflow interpretation, Lower Urinary Tract Function. Pp. 410-412. Alan offering reference ranges for both males and R. Liss, Inc. females, for both maximum and average flow 2 Haylen, B., Ashby, D., et al. (1988), Maximum and rates, over a wide range of voided volumes average Urine Flow Rates in Normal Mal and (Figure 4). Female Populations – the Liverpool Nomograms.
British J. of Urol., 64: 30-38 Patient's results are plotted as a percentage of 3 Abrams, P., Fenely, R. and Torrens, M (1983). normalcy, by both age and sex, for both Urodynamics. Pp. 26-38 Berlin: Springer-Maximum and Average Uroflow. All of the Verlag.Liverpool Nomograms for all age and sex considerations are included in Microflo’s
2 Copyright ? 2000 Life-Tech, Inc.. All rights reserved.