LBL-2008-41-v5 OptoMonitor 3 IFU_en Rev 2021-08
60
|
P a g e
Equalization
Pressure equalization is done in two successive steps:
1)
Pa/Pd equalization
2)
dPR factor equalization.
Step 1) takes up to 4 beats to complete while step 2) requires a minimum of 4 beats. This leads to an
equalization time of about 8 to ** seconds.
Once Step 1) and 2) are completed, the calculated correction factor is applied to the signal thus
gradually changing the averaged values displayed over the next ** beats.
1.
Close the stopcock, remove the guidewire introducer, close the Y connector valve and flush the
catheter with saline.
2.
Verify Pd is equal to Pa.
3.
Press the EQUALIZATION button to begin equalization of the Pd (pressure guidewire) and Pa
(aortic) readings. The message window will show the “Equalization in progress” message. After a
short time, the message will update to “Equalization successful” if equalization has been
performed properly, otherwise it will show “Equalization failed”, and this step will have to be
repeated.
4.
When equalization is completed, the
icon appears on the top left corner of the screen, and
the fourth LED indicator on the top row of the Optical Unit will also stay steady green to indicate
successful equalization.
5.
Verify visually that pressure guidewire (Pd) reading is equal to aortic (Pa) reading. If not, re-
perform equalization.
NOTE
:
See sections 11.5 - 11.7 for trouble shooting.
Pa and Pd curves delay adjustment during Equalization
A message “Please Adjust Pa Pd Delay” is prompted if there is a delay between the Pa and Pd curves.
Follow section 5.7 for instructions on adjusting Pd delay.
Positioning Sensor Distal to Stenosis
Advance OptoWire pressure sensor distal to the stenosis per recognized FFR procedures.
WARNING:
•
The OptoMonitor 3 will not zero (either automatically or manually) should the
pressure reading vary, for example detecting pulsatile blood pressure inside a
patient.