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Nexam Pro User Manual
Chapter 13
A work factor-volume shows an x-y plot of the work factor related to the
bladder volume. It serves as an aid for diagnosing bladder outlet obstruction.
WF (work factor) represents the strength of the bladder contraction during
voiding. During normal voiding, WF rises slowly, attaining its maximum value
when the bladder is nearly empty. If there is residual urine (as for most BPH
patients) it falls prematurely to a low value before the bladder is empty.
Read also:
Griffiths et al.: Quantification of Urethral Resistance and bladder function
during voiding...,
Neurology and Urodynamics
, 8:17-27, 1989.
13.5.11 Blaivas Detrusor/Flow Plot
Click the
Det/flow plot (Blaivas)
button or choose
Options
>
Blaivas
Detrusor/flow plot
from the menu and enter the free Qmax to display the plot.
Figure 13.16
Blaivas Detrusor/flow plot
The bladder outlet obstruction nomogram for Women (Blaivas plot) is an easy
method of classifying pressure-flow and free-flow data to distinguish between
the presence or absence of obstruction in Women.
The nomogram is constructed by two parameters: free Qmax and Pdet.max.
The free Qmax (free flow study) is used instead of Qmax (pressure-flow
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