Monitor configuration
CNAP
®
Monitor 500
Page 4-8
Version 5.2.5,
h
21-FHZU-10002
4.5.3
Zeroing
After having connected the CNAP
®
Monitor 500 and the patient monitor using a) the CNAP
®
Trans-
ducer Cable and b) the IBP Interface Cable (see 4.5.1 - BP Wave Out configuration), zeroing must
be performed:
a) Zeroing without active measurement:
Before and after an active measurement (without displayed CNAP
®
values), zeroing is acti-
vated
automatically
(a zero signal is output). Zeroing can be immediately performed on
the patient monitor.
b) Zeroing during active measurement:
During an active measurement (with displayed CNAP
®
values), zeroing is inactive; howev-
er, it can be activated
manually
in the
Parameter
menu:
1. CNAP
®
Monitor 500: Activate zeroing via
IBP: Zeroing Start
2. Patient monitor: Performing the zeroing process
3. CNAP
®
Monitor 500: Deactivate zeroing via
IBP: Zeroing Stop
Illustration 23: Parameter menu: IBP: Zeroing
NOTE:
•
Usually a patient monitor will report successful zeroing (must be within ± 32 mmHg),
e.g. by signaling "zero completed, offset is xx mmHg".
•
If you do not deactivate
IBP: Zeroing Stop
and leave it on
Stop
, the pressure
signal on the patient monitor will display 0 mmHg.
CAUTION:
In order to ensure full accuracy of the CNAP
®
blood pressure waveform and its derived
blood pressure values to another patient monitor, do not forget to perform an IBP zeroing
when connecting the two devices. In addition, the CNAP
®
waveform is to be zeroed ac-
cording to your hospital regulation (but at least once a day). Plus, zeroing should be per-
formed if there is any doubt as to the accuracy of obtained recordings and in the event of
a new connection of the transducer to the monitor.
NOTE:
•
Blood pressure values obtained by means of CNAP
®
and invasively obtained reference
values (e.g. radial measurement) may differ for the following reasons:
a)
Difference in beat detection
b)
Different settings for
Parameter Averaging
(see chapter 4.2 – Parameter Av-
eraging menu item)
c)
Physiological differences due to different measuring positions (e.g. left-right,
Distributed by BIOPAC Systems, Inc.
Manufactured by CNSystems AG
