NBP
CNAP
®
Monitor 500
Page 10-1
Version 5.2.5,
h
21-FHZU-10002
10
NBP
10.1
General information
NBP (Non-Invasive Blood Pressure) uses the oscillometric method to determine a patient's blood
pressure on a non-continuous basis. To achieve this, the NBP module is integrated into the CNAP
®
Monitor 500. Blood pressure measurement is conducted by means of a NBP cuff (available in 4
sizes) which is placed around the patient's upper arm (brachial artery) and connected to the CNAP
®
Monitor 500 on the left side of the monitor (see chapter 3 – Introduction). For measurement pur-
poses, the pressure in the NBP cuff is controlled by the NBP module. The cuff pressure is first in-
creased above systolic blood pressure and decreased step by step. The pulsations in the NBP cuff
provide the basis for deriving the blood pressure values Sys and Dia.
NOTE:
•
When a measurement process is started on the CNAP
®
Monitor 500, a NBP mea-
surement is also triggered automatically.
•
However, it is also possible to trigger an NBP measurement manually at any time
during measurement – except during display of the
Setup Patient
dialog (see
chapter 10.6 – NBP options).
•
NBP measuring interval can be pre-set in the
Measurement
menu for every new
measurement and can be adapted via the
Parameter
menu during a measurement.
•
Inflation pressure of the NBP cuff is determined by the selected patient category (see
chapter 5.2 – Patient entry). During NBP measurement, it is graphically and numeri-
cally displayed as a bar at the bottom of the
Parameter frame
(see illustration 42
below).
•
Interruptions due to NBP measurements are displayed as white countdown bars in
the
Parameter frame
(see chapter 3.6 - Timer).
•
During an NBP measurement, neither venous stasis nor manual change of finger can
be performed.
NOTE:
•
The CNAP
®
blood pressure waveform is calibrated by means of an oscillometric NBP
measurement. If the accuracy of the NBP measurement is affected by artifacts (e.g.
weak pulse, irregular pulse, artifacts from patient movement or tremor, or respirato-
ry artifacts), this may also affect and reduce the accuracy of blood pressure values
measured by the CNAP
®
Monitor 500.
•
An NBP cuff can be put on the same arm as the CNAP
®
double finger cuff (ipsilateral-
ly) or on the other arm (contralaterally).
Illustration 49: NBP measurement
For an upper arm measurement the patient must be in upright, sitting or supine position. If sitting,
the feet should be flat on the floor and the legs not crossed. An arm rest and a back rest is recom-
mended.
The center of the upper arm cuff must be on the same level as the right atrium in every body posi-
tion during the measurement. During measurement the patient should try to relax and avoid
speaking and other body movement.
Prior to the first measurement a resting phase of at least 5 minutes is recommended.
Distributed by BIOPAC Systems, Inc.
Manufactured by CNSystems AG
