Analysis Program
Nexam Pro User Manual
231
A CHESS class is determined depending on the PURR (Passive Urethral
Resistance Relation) value and the Pmuo (detrusor pressure at which flow
starts) value. Pmuo values are divided in four regions A,B,C,D. PURR values
are divided in four regions 1,2,3,4.
Four examples make clear how to interpret the CHESS classes.
CHESS class
Symptoms
Diagnosis
A1
low Pmuo, complete bladder emptying with
low pressure rise
normal
A4
low Pmuo, high pressure increase needed to
empty the bladder
obstruction
D1
high Pmuo, low pressure increase needed to
empty the bladder
elastic BPH
D4
high Pmuo, high pressure increase needed to
empty the bladder
inelastic BPH
Read also:
K. Höfner, A.E.J.L. Kramer, H.K. Tan, H. Krah, U. Jonas: CHESS classification of
bladder-outflow obstruction. A consequence in the discussion of current concepts,
World Journal of Urology
, Vol 13 Nr 1, February 1995.
13.5.10 WF/Volume Plot
Click the
W/F Graph
button or choose
Options >
W/F
Graph
from the menu
to display the plot.
Figure 13.15
WF/volume plot
Summary of Contents for Nexam Pro CIM
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