Anorectal Manometry
Nexam Pro User Manual
159
expulsion markers if they are not marked during the investigation.
The balloon expulsion results show whether the expulsion was successful,
partial or failed, balloon volume, and duration.
9.5.14 Rectal Compliance
During the analysis, the compliance can be determined by placing compliance
markers. Place the compliance markers so that they surround the area over
which the capacity should be determined. For each pair of compliance markers
placed, the calculated compliance will be present in the result screen and in
printed reports.
Figure 9.31
Rectal compliance test
The letters between square brackets refer to the corresponding letters in
Figure 9.31.
The compliance is the change in volume for a change in pressure. It is defined
as C= dV/dP, where dV is the volume increment and dP is the change in
pressure associated with this volume increment.
V VolumeB - VolumeA
Compliance = ------- = ---------------------------------
Prect Prect B - Prect A
Rectal filling begin compliance = VolumeA
Rectal filling end compliance = VolumeB
When during the investigation a first sensation marker was placed the sensory
threshold will be determined. This parameter will be included in the result
screen and in the printed reports. For each sensation marker placed during the
investigation, the following parameters will be determined:
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