2.4 Displaying the Result
Once the measurement is completed, the monitor will display all results under
the respective labels as follows:
Figure 6: BP Result Screen
10 seconds of the pulse wave signal are displayed along the bottom of the
display. Vertical red lines indicate the start of each pulse. This display can
provide a visual indication of any arrhythmias and inter-beat variability (such as
that caused by respiratory load).
Measurement results may not be accurate in the presence of arrhythmias.
Arrhythmias may be apparent on the rhythm strip.
The main screen will also display the average pulse wave pulse.
2.5 Cancelling the measurement
Press any button
during a measurement to cancel the measurement and deflate
the cuff.
Note: While the device is calculating results it will not respond to button presses.
2.6 Interpreting Signal Quality
The signal quality of the pulse wave measurements will be measured by the
device and expressed as a Signal-to-Noise Ratio (SNR) on a logarithmic scale
(dB). An increase in the SNR by 3 indicates a tenfold increase in the signal
quality. The SNR acceptability is indicated on the results screen as a text status
message and can vary from Invalid, Poor, Acceptable, Good, through to
Excellent as shown in Table 4: Signal quality classification. The numeric value of
SNR is displayed on the Pulse Wave Analysis screen as shown in Figure 7.
Measurements with a SNR below 6 (Poor or Invalid) should be discarded. The
device will not display the augmentation index and central pressures in these
circumstances. It is recommended to repeat the measurement and to confirm
the patient is remaining still and not talking during the measurement. (Patients
often move when talking.)
Signal-to-Noise Ratio (dB) Signal Quality
Classification
Colour on
Results screen
SNR < 0
Invalid
Red
0
≤
SNR < 6
Poor
Red
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BP+ User Manual (R7)
