Data Critical Corporation 02DT-7000 Manual De Usuario
TROUBLESHOOTING
PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft
211
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2. Muscle Artifact
Muscle artifact is also known as electromyographic signals (EMG) and are produced
by the normal electrical activity associated with muscle movement. The only differ-
ence between the electrical muscle activity and the electrical heart activity is that car-
diac voltage is generally consistent and muscle voltage is erratic. Because the
bandwidth of muscle noise is so similar to the ECG signal, it cannot be totally elimi-
nated by filtering. If the filter was increased enough to eliminate muscle artifact, then
the majority of the ECG components would also be eliminated.
by the normal electrical activity associated with muscle movement. The only differ-
ence between the electrical muscle activity and the electrical heart activity is that car-
diac voltage is generally consistent and muscle voltage is erratic. Because the
bandwidth of muscle noise is so similar to the ECG signal, it cannot be totally elimi-
nated by filtering. If the filter was increased enough to eliminate muscle artifact, then
the majority of the ECG components would also be eliminated.
Fig. 97. Example 4 - Muscle Artifact
Excessive muscle artifact may be due to seizure activity, Parkinson’s disease of other
diseases that cause somatic tremors. Tension, pain, and a cold environment may also
cause patients to have an increase in muscle activity. Proper skin preparation and elec-
trode placement in areas away from skeletal muscle can reduce this type of artifact,
but will never eliminate it completely.
diseases that cause somatic tremors. Tension, pain, and a cold environment may also
cause patients to have an increase in muscle activity. Proper skin preparation and elec-
trode placement in areas away from skeletal muscle can reduce this type of artifact,
but will never eliminate it completely.
Fig. 98. Example 4 - Excessive Muscle Artifact due to Parkinson’s