GE MAC 1600, Operator'S Manual

Page: 106 / 162

9-14 MAC™ 1600 2028451-182B
System Configuration
Many of the fields on the Stress ECG Setup windows are the same as
those on the Resting ECG Setup or the Arrhythmia Setup . The following
table lists the settings that are unique or differ from the resting or
arrhythmia setups. For all other fields, refer to
“Resting ECG Setup” on
page 9-6 or “Arrhythmia Setup” on page 9-12.
Field Comment
Page 1
Low Pass Filter [Hz] Identical to the field in the Resting ECG Setup.
If FRF is the selected ECG Filter Type, the low pass filter
will be available during a stress test only when the FRF
filter is toggled off. For more information, refer to
“Stress
Options” on page 7-6.
ECG Filter Type Determines which method will be used to filter the ECG
signal. Options are:
„
ADS
Anti-Drift System – reduces baseline shift
„
FRF
Finite Residual Filter – reduces noise and artifacts
The selection also determines the behavior of the Lower
Pass Filter [Hz] and ADS/FRF fields.
ADS/FRF Enables/disables the selected ECG Filter Type. The label
for this field changes depending on the filter type that was
selected.
Page 2
Max Predicted HR Formula Determines the formula used to predict 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 50 year old’s maximum predicted
heart rate would be 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 50 year old’s maximum predicted
heart rate would be 160 - (50-25) * 0.9 = 138.
Target HR [%] Determines the percentage of the maximum predicted
heart rate the stress test is targeting.