User's Manual

Radius-7 Chapter 1- Technology Overview
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Adaptive Threshold Alarm (ATA)
The Adaptive Threshold Alarm (ATA) feature is an optional feature that helps reduce the
frequency of non-actionable alarms.
ATA establishes the alarm limit threshold based upon the patient-specific baseline value of
the SpO2 parameter which is determined from the recent history of SpO2 values. An Adaptive
Threshold Limit is continuously determined for the patient and SpO2 values outside the
Adaptive Threshold Limit trigger an audible alarm. The Adaptive Threshold Limit is bound by
the standard SpO2 low alarm limit and the Rapid Desat low alarm limit. SpO2 values that
exceed the Rapid Desat limit, whether it occurs rapidly or not, will activate an audible alarm.
Prior to activating ATA, please review and select the appropriate standard low alarm limit and
other alarm settings. Once ATA is selected, the Rapid Desat Alarm protection is always active.
If the ATA low alarm limit is violated, ATA generates an audible alarm.
It is important to note that once activated, ATA has the following automatic safety features:
Reminder Tones
If an SpO2 value from a patient drops below the standard low alarm limit set by the user, a
visual alert will display and a reminder tone will repeat every 15 minutes as long as the
condition persists. If the SpO2 value drops below the ATA low alarm limit, an audible alarm
will be activated.
Rapid Desat Alarm Protection
The Rapid Desat feature is always active when ATA is turned on. This means that deep
desaturations (5% or 10%) from the standard SpO2 low alarm limit immediately generate an
audible alarm. When used with ATA, it also serves as absolute low alarm limit protection.
SpO2 values exceeding the Rapid Desat low alarm limit, whether rapid or not, will activate an
audible alarm. The user can change the Rapid Desat default setting from 5% to 10%. ATA does
not allow a Rapid Desat default setting of 0%.
When ATA is turned Off, the device uses the standard alarm limits and standard alarm delays.
FastSat® (FST®)
FastSat enables rapid tracking of arterial oxygen saturation changes. Arterial oxygen
saturation data is averaged using pulse oximeter averaging algorithms to smooth the trend.
When the Radius-7 is set to FastSat On, the averaging algorithm evaluates all the saturation
values providing an averaged saturation value that is a better representation of the patient’s
current oxygenation status. With FastSat, the averaging time is dependent on the input
signal.