GE HEALTHCARE MAC 2000, Operator'S Manual

Page: 135 / 226

System Configuration
Stress ECG Setup Fields–Page 2
Field
Comments
Max Predicted HR Formula Determines the formula that predicts the patient’s maximum
heart rate. Options are:
• WHO
This formula, recommended by the World Health
Organization, subtracts the patient’s age from 220.
For example, a patient who is 50 years old has a maximum
predicted heart rate of
220 - 50 = 170 .
• AHA
This formula, recommended by the American Heart
Association, varies depending on the age of the patient.
• < 25 years old = 160 bpm
• > 75 years old = 115 bpm
• 25—75 years old = 160 – (age – 25) * 0.9
For example, a patient who is 50 years old has a
maximum predicted heart rate of 160 - (50-25) * 0.9 =
138.
Target HR [%] Determines the percentage of the maximum predicted heart
rate the stress test is targeting.
Protocol/Master’s Step
Mode Determines which protocol conducts the stress test. The
protocol determines the test phases, stages, stage durations,
stage loads, and the times at which auto reports are printed
and blood pressure is recorded.
You can create custom protocols by selecting the Edit
Protocols button.
For more information, see “Editing Stress Protocols” on page
137 .
NOTE:
If Master’s Step device is selected as the Stress Test
Device in Basic Setup (see “Basic Setup” on page 113 ), this
field is labeled Master’s Step Mode instead of Protocol .
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