HR Dialog Heart Rate (HR)
12 - 4 V Series Operating Instructions
4. Select the Cancel or Accept button.
•The Cancel button closes the dialog without saving the settings.
•The Accept button saves the settings and closes the dialog.
12.2.4 Configuring the QRS Threshold
The minimum detection threshold used in the automatic mode is about 0.16 mV. In case the P waves
are very tall, one might consider moving the minimum QRS detection threshold up to be above the
level of the P waves using the manual mode so events like ventricular standstill are not missed.
In the manual mode, two horizontal lines (one below and one above the baseline) appear on the
screen. These represent the current minimum detection threshold on the positive and negative sides
of the baseline so manual adjustment for both positive and negative going QRS's can be made. Using
the commands provided, move the minimum detection threshold up or down to ensure it is above
the level of the P waves but below the peak of the R-wave. Since the P-wave height could vary a little
from beat to beat, do not set the horizontal line representing the minimum detection threshold at or
barely above the level of the peak of the P wave. Ensure that it is at least one or two millimeters above
the peak of the P wave but below the peak of the R-wave.
1. Select the HR digital tile.
2. Select the Setup tab (as shown in FIGURE 12-2).
3. Select the QRS Threshold button.
The Minimum QRS Threshold screen displays (as shown in FIGURE 12-3).
FIGURE 12-3 Example Minimum QRS Threshold Dialog
4. Wait for the waveform to draw, then either select the Default button to automatically set the
threshold. Or, select the Adjust button to manually adjust the minimum QRS detection
threshold. Select the button to move the threshold line above the P wave, or select the
button to move the threshold line down closer to the P wave.
5. Once the threshold is in the desired position, select the Accept Threshold button.
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