152
Nexam Pro User Manual
Chapter 9
Using the squeeze markers following parameters are calculated:
Resting pressure
The resting pressure is the average pressure over a one-second period before
the squeeze begin marker [A].
Maximum squeeze pressure
The maximum squeeze pressure (i.e., the pressure increment during squeeze)
is calculated as the highest squeeze pressure (between marker [A] and [B])
minus the resting pressure.
Squeeze duration
The squeeze duration is the time between the squeeze markers [A] and [B] =
[E].
Average squeeze pressure
The average squeeze pressure is calculated as the average pressure between
the squeeze markers minus the resting pressure.
Area under the curve
This is calculated as the integral of pressures between the squeeze markers
and the resting pressure.
Vector Volume Plot (VVP): When 2 or more cm-markers are placed, a Vector
Diagram can be constructed. The VVP will use the maximum pressure on
each channel between the cm-markers in order to create a squeeze VVP.
9.5.7
Endurance Squeeze Test
The squeezes should be marked with two endurance squeeze markers. The
first endurance squeeze marker should be placed at the onset of the squeeze.
The second endurance squeeze marker should be placed at the end of the
squeeze. Normally the markers are already placed during the investigation.
You can reposition the endurance squeeze markers or insert new endurance
squeeze markers if squeezes are not marked during the investigation.
In the anorectal settings dialog (
Settings > Anorectal manometry settings
),
you can specify the endurance squeeze time (see § 9.5.3). The endurance
squeeze time is the time period for which the fatigue slope of the external anal
sphincter pressure is determined. The time period starts at the maximum
squeeze pressure (between the endurance squeeze markers) and ends
squeeze time later. Two channel markers will be placed to indicate these
positions.
Summary of Contents for Nexam Pro CIM
Page 1: ...Nexam Pro User Manual...
