©
2014 Draeger
Medic
al
,
Inc
.
INFINITY CENTRAL STATION & M300 QUICK REFERENCE GUIDE
| 33
THIS GUIDE IS INTENDED
FOR REFERENCE
ONLY. REFER
TO
INSTRUCTIONS FOR USE
MANUAL.ADDITIONAL INFORMATION
ECG Troubleshooting Techniques
When using the M300 most of the following techniques are per-
formed at the ICS. When using a bedside monitor most of the fol-
lowing techniques are performed at the bedside monitor. Before
using the following suggestions, ensure that the lead preparation
and placement instructions have been followed. Also, improve ar-
rhythmia processing by Relearning when appropriate.
UNDERCOUNTED HEART RATE/FALSE
AS
Y
ST
OLE
ALARMS / LOW MV
MESSAGE
If the R
wave amplitude
for
your patient
is less than 0.5
mV
(one large
bo
x
on the ECG paper), the monitor may:
-
Undercount
the
heart
rate (QRS c
omple
x
is not large
enough
to
detect).
-
Alarm falsely
for
asystole
(QRS c
omple
x
is not large
enough
to
detect).
-
Give
a low
mV Message
(QRS c
omple
x
is not large
enough
to de-
tect).
To correct with the six lead electrode or five lead electrode set
1. View all leads and select processing for arrhythmia detection
the ECG leads that provide QRS amplitude of 1 cm tall (one
large box).
2. Select processing for arrhythmia detection in just one lead if
only one satisfactory lead is available (patient must be closely
monitored for this scenario).
3. Increase the detection sensitivity (gain).
4. Position the electrodes away from the pacemaker (if present)
conduction leads to help reduce signal distortion for a paced
patient. In this approach the ECG amplitude will be reduced. It
is, therefore, important that lead II be selected for the first
channel for arrhythmia processing and the amplitude be at
least 500mV.
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