M.I. P/N 004-2163 Rev. C
15
Name
– The
Name
field is set to Catalog for standard catheter configurations. Users can
select their own name when either editing a catalog catheter or creating their own catheter.
Model Number
– This refers to the Millar model number of the catheter. Catheters
modified using the
Create New Catheter
option retain the model from the catheter from
which they were created. Custom catheters contain a user defined model.
Part Number
– This refers to the Millar part number.
Size –
Refers to the French size of the catheter. 3F = 1 mm diameter.
ElectrodeNumber
– Refers to the number of electrodes on the catheter.
Spacing
– Refers to the spacing between sensing electrodes. This spacing is used by the
software when calculating volume from Baan’s equation for calibrating in units of volume
(
μ
l or ml).
Sensor
– Describes the location of the pressure sensor(s). The pressure sensor is located
between the listed electrodes. If a pressure sensor is located proximal to all electrodes, its
location will be described as “>E12” or “>E4” as appropriate.
Length
– Refers to the length of the catheter from connector to tip.
FieldConfig
– Refers to the excitation field configuration of the catheter – single field or
dual field.
ExcitationCurrent
– Refers to the excitation current set for this catheter configuration.
SegAmplifierGain
– Refers to the chosen gain setting for this catheter configuration.
Blood Resistivity
This feature controls the resistivity used in Baan’s equation for calculating the volume
displayed on the gain and calibration controls within the Control Interface. The values can
also be saved for use in PVAN
Ultra
. The MPVS
Ultra
system can measure resistivity
using the rho cuvette (see information regarding the
Rho Cuvette
tab) or the user can
enter a value for resistivity. Resistivity is used by the software when calculating volume
from Baan’s equation for calibrating in units of volume (
μ
l or ml).
Click
Load
to recall information used in a previous study. Click
Save
to save the present
value for later use. The interface allows the user to name the entry.
Unlock the catheter configuration and click
Load
to load settings from a previous study or
the latest measurement from the rho cuvette.
Alpha (
α
)
Alpha is an electric field homogeneity factor that allows a user to scale volume
measurements to match independent measurements. This is typically done to make the
stroke volume measurement given by Baan’s equation and the conductance method match
the stroke volume measurement given by thermodilution, ultrasound or flow-probe
measurements. Alpha is saved along with the present blood resistivity value and is used by
the software when calculating volume from Baan’s equation for calibrating in units of
volume (
μ
l or ml).
Graphical Electrode Configuration Control
When a catheter configuration is selected in the
Millar Catheter Selection
table, the
display in the control will adjust to match the configuration. The user can then adjust the
Detailed Operation
