Page 8-16 Infinity Gamma Series VF4
ECG and HR Safety Considerations
HR Alarm Settings
Set HR alarm limits on the Alarm Limits table (see the chapter
Alarms and Messages). If you turn the HR alarm off, the monitor
displays a crossed bell icon in the HR parameter box and the ban-
ner
HR Alarms Off appears above the first waveform channel.
WARN IN G: If an asystole or ventricular fibrillation
occurs while the HR alarm and arrhythmia monitoring is
turned off, the monitor does not alarm for these life-
threatening events.
Neonatal ECG Monitoring
To obtain the most accurate heart rate count and waveform dis-
play, select the ECG lead(s) with the smallest T wave and the
largest monophasic QRS.
WARNIN G: Neonatal QRS complexes that are biphasic
and less than 40 ms wide, or monophasic and less than
20 ms wide, are displayed smaller than their actual
amplitude.
ECG 50/60 Hz Notch Filter Setting
When the line frequency is set incorrectly, the resulting 50 or
60 Hz noise on the ECG signal can make the ECG waveform
unreadable along with masking QRS complexes. As a result,
detection of the QRS complexes becomes unreliable. When these
cannot be sensed reliably, incorrect HR calculations may result,
leading to both false positive and false negative HR alarms.
Muscle Stimulators
WARNIN G: The use of electrical muscle stimulators
may interfere with ECG and respiration monitoring. If this
occurs, discontinue their use.
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