Figure 24:
Time-Slice Statistics
Viewing Hourly Averages
To display trends in a patient’s ABP study, click the Hourly Averages tab at the bottom of the window (Figure
25). The table shows the average BP readings for each hour the patient was tested. In addition to brachial
systolic (SYS) and diastolic (DIA), and the heart rate (HR), the following statistical averages are provided:
•
Mean Arterial Pressure (MAP) - This is the average pressure in an artery over the period of one heartbeat.
In the brachial artery, it is calculated by adding the diastolic to one-third of the difference between the
systolic and diastolic readings.
•
Pulse Pressure (PP) - This is calculated by subtracting the diastolic from the systolic reading. It is another
hemodynamic parameter that may serve as an indicator for cardiovascular risk. Pulse pressure is provid
-
ed using both brachial (PP) and central (cPP) values.
•
Pressure Rate Product (PRP) - This is the product of the average systolic reading multiplied by the aver
-
age heart rate. PRP strongly correlates to a patient’s activity level and may be a key indicator of cardio
-
vascular risk. As typically reported in research and clinical applications, PRP data is divided by 1000.
Use the check boxes at the top of each column to select the statistics you would like to see displayed in the
graph at the bottom of the page. You can resize the table and zoom in on the graph with your mouse pointer.
(For instructions on resizing and zooming, see Viewing an Ambulatory Blood Pressure Study.)
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