Patient Monitor User’s manual
8-2
Caution: In order to get the best Resp waveforms, when using RA and
LA electrodes for measuring Resp, it is advised to place them
horizontally; when using RA and LL electrodes, it is advised
to place them cornerways.
Optimizing Lead Placement for Resp
If you want to measure Resp and you are already measuring ECG, you may
need to optimize placement of the two electrodes between which Resp will be
measured for some patients. Repositioning ECG electrodes from standard
positions, results in changes in the ECG waveform and may influence ST
monitoring.
Cardiac Overlay
Cardiac activity that affects the Resp waveform is called cardiac overlay. It
happens when the Resp electrodes pick up impedance changes caused by the
rhythmic blood flow. Correct electrode placement can help to reduce cardiac
overlay: avoid the liver area and the ventricles of the heart in the line between
the Resp electrodes. This is particularly important for neonates
Lateral Chest Expansion
Some patients, especially neonates, expand their chests laterally. In these
cases it is best to place the two Resp electrodes in the right midaxillary and left
lateral chest areas at the patient’s maximum point of breathing movement to
optimize the Resp wave.
Abdominal Breathing
Some patients with restricted chest movement breathe mainly abdominally.
In these cases, you may need to place the left leg electrode on the left abdomen
at the point of maximum abdominal expansion to optimize the Resp wave.
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