LABORIE Nexam Pro WPU-L4 User Manual page 147

Figure 9.22 Anorectal channel definition
When using spiral catheters with one cm (or 0,5 cm) spacing between the
pressure channels, you have to define the sensor positions and so the
channels which will be analyzed. The previous figure serves as an example.
▪ The RAIR test can tell you which channel measured is at the IAS (Internal
Anal Sphincter). A drop in pressure after inflating the balloon indicates the
internal sphincter. In the window channel, P3 is defined as IAS. This implies
that for the RAIR test, only channel P3 is analyzed.
Figure 9.23 RAIR test
▪ The squeeze test can tell you which channel is at the EAS (External Anal
Sphincter). The strongest pressure increase indicates the external
sphincter. In this window channel P2 is defined as EAS.
▪ The tip is positioned in the rectum (in the figure above: channel 4).
▪ After setting the channel definition, you have to check the position of all the
markers.
Anorectal Manometry Nexam Pro User Manual 147