Philips ST80i - Filtering; Sync Output

Preparing the Patient
ST80i Stress Test System Instructions for Use 3-25
Filtering
When you open the ST80i application, the active settings of the filters are associated with your
user profile. The same filter settings apply to both displayed and printed waveforms. The filter
settings are printed with the report.
The smart filter can be enabled or disabled through the Config screen
User Profile tab’s Filters
button. The same filter settings apply to both displayed and printed waveforms. The filter
settings are printed with the report.
The filtering techniques developed for ST80i permit the user to identify any clinically
significant ST deviation and will not degrade the integrity of the relevant ECG signal content,
specifically the ST segment (deviation and slope). This capability is especially important
during stages of exercise (stage three and later) where more motion and muscle artifact is
present, which could otherwise obscure the ST deviation.
The ECG data is stored in its unfiltered state (0.02 – 300Hz, all filters off) and user-selected
settings are stored with the ECG.
NOTES The ECG data is filtered at 0.05-150Hz before being analyzed by the algorithm. This filter is called the
algorithm filter and cannot be turned off by user. The algorithm filter is independent from other filters
and is neither controlled by the user nor affects the saved ECG data.
All filters can be turned on or off as needed to improve signal quality except for the algorithm filter (as
described above) and minimum filters (0.02Hz high pass filter and 300Hz low pass filter).
If needed, you can change the default filter settings. For details on filter settings, see “Gear
(Quick Settings)” on page 2-30.
Sync Output
ST80i supports two analog ECG output signals and one TTL ECG Sync output on the AIM.
The AIM accepts real-time ECG data from the wireless PIM and dispatches the data to the PC
and output channels. This signal serves as a synchronization signal for coordination of timing
between ST80i and another device, such as imaging devices.
ST80i also supports the TTL and Analog output options, which allow selectable ECG signals
to be sent to Echo system, NIBP and/or SpO
2
for further clinical analysis.
The analog-out signals are amplified.
TTL/Analog Output Option:
 Specifying the Sync Lead
– User can select the ECG lead used for the TTL/Analog Output.