User's Manual

Table Of Contents
6 Monitoring Pulse Rate
157
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 126, including Asystole, Vfib and Vtach
alarms, and the heart rate alarms. This is indicated by the message
ECG/ARRH ALARM OFF (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 ALARM OFF 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, generated by the active
alarm source, either HR or Pulse, are set in Configuration Mode by adding a set value to the high and
low alarm limits. You need to know what value has been configured for your monitor. Changing the
high and low alarm limits automatically changes the extreme alarm limits within the allowed range.
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 Δ ExtrTachy and Δ ExtrBrady.
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 SpO and Setup ECG menus and the QRS tone modulation in the Setup SpO 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.