7 Monitoring Pulse Rate
159
WARNING
Selecting Pulse as the active alarm source for HR/Pulse switches off the arrhythmia alarms listed in the
section “ECG and Arrhythmia Alarm Overview” on page 123, including Asystole, Vfib and Vtach
alarms, and the heart rate alarms. This is indicated by the message
ECG/Arrh AlarmsOff (unless this has
been configured off for your monitor), and the crossed-out alarm symbol beside the ECG heart rate
numeric. The message
ECG/Arrh AlarmsOff can be configured off, or to switch to a yellow (medium
severity) INOP after a fixed number of hours.
High and low pulse rate and extreme bradycardia and extreme tachycardia alarms from pulse are active.
Alarm Source Selection Disabled
If you cannot change the alarm source, selection of the alarm source may be disabled. If you try to
change the source, the monitor displays the message
To activate enter Config and enable Alarm Source
Selection
. This setting can only be changed in Configuration Mode.
Changing HR/Pulse Alarm Limits
As Pulse and HR share the same high and low alarm limits, if you change the alarm limit in the Setup
Pulse
menu, the high or low alarm limits for HR in the Setup ECG menu change automatically, and vice
versa. The only exceptions are caused by a low limit clamp for each measurement: the lowest value for
Pulse when derived from SpO
2
is 30 bpm; from HR 15 bpm, and from Pressure 25 bpm.
Extreme Alarm Limits for Heart Rate
The extreme rate alarms, *** Extreme Tachy and *** Extreme Brady, are generated by the active alarm
source, either HR or Pulse. The limits are set automatically by adding a set value (the Δ value) to the
high and low alarm limits. So, changing the high and low alarm limits automatically changes the
extreme alarm limits (within an allowed range, see “Extreme Alarm Limits for Heart Rate” on
page 125 for details).
You need to know which value has been configured for your monitor.
• To see the values added to the high and low limit alarms to create the extreme rate alarms for your
monitor, in the
Setup ECG menu, see the menu items ΔExtrTachy and ΔExtrBrady.
QRS Tone
The active alarm source is also used as a source for the QRS tone. You can change the tone volume in
the
Setup SpO₂ and Setup ECG menus and the QRS tone modulation in the Setup SpO₂ menu.
WARNING
The audible QRS tone might be influenced by external interference and is not intended to be used as a
substitute for ECG based arrhythmia analysis.
If arrhythmia detection is needed, do not rely on the audible QRS tone.
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