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PatientNet Operator’s Manual, v1.04, 10001001-00X, Draft
All information contained herein is subject to the rights and restrictions on the title page.
Commonly Asked Questions
1. How much change in the shape of the QRS complex is tolerated by the
algorithm?
Subtle changes in the QRS will be tolerated by the algorithm if the new beat continues
to match the stored template. The reference QRS is a snapshot of the dominant beat at
the time the system was “learning.” If the patient’s ECG changes due to ischemia or
infarction (the resultant ST, T-wave changes). then the system may look at the beat as
an abnormal beat, resulting in false calls.
Subtle changes in the QRS will be tolerated by the algorithm if the new beat continues
to match the stored template. The reference QRS is a snapshot of the dominant beat at
the time the system was “learning.” If the patient’s ECG changes due to ischemia or
infarction (the resultant ST, T-wave changes). then the system may look at the beat as
an abnormal beat, resulting in false calls.
2. How often should a new reference be learned?
Each individual unit will decide on their protocol for frequency of relearning. Some
suggestions:
•
suggestions:
•
At the start of each shift.
•
Whenever there are rhythm changes, such as the morphology of the dom-
inant normal beat (amplitude, width, or polarity) changes significantly
(and persists) from the learned dominant normal beat.
•
Whenever a current learn was performed during an extremely noisy seg-
ment, a re-learn should be performed when the noise subsides.
ment, a re-learn should be performed when the noise subsides.
•
If the system learned an abnormal morphology as normal.
•
When the electrodes are changed.
•
When the Rhythm Indicator in the Patient Tile turns from green to yellow
or red.
3. Which alarms are on during the LEARN process?
Only the alarms for Asystole, Ventricular Fibrillation, and High/Low Heart Rates are
enabled during the learn mode. Do NOT initiate a LEARN or RELEARN during an
episode of ectopy.
enabled during the learn mode. Do NOT initiate a LEARN or RELEARN during an
episode of ectopy.
4. If I change the lead placement, does the monitor automatically
RELEARN?
No, you must manually initiate a RELEARN whenever the lead’s configuration
(placement) is changed.
No, you must manually initiate a RELEARN whenever the lead’s configuration
(placement) is changed.
5. How should the monitor be set to notify the clinician when a patient who
is in Atrial Fibrillation converts to Normal Sinus Rhythm?
For a patient in Atrial Fibrillation, the heart rate is usually faster than the patient’s nor-
mal rate. The LOW HR alarm and recording should be set just below the rate of Atrial
Fibrillation, so that when the patient converts, the slower rate (although not a true
Bradycardia) may result in an alarm and recording. The time of the recording will be
printed on the strip. The time will be stored as a history event and may be recalled if
the STORE function was enabled.
For a patient in Atrial Fibrillation, the heart rate is usually faster than the patient’s nor-
mal rate. The LOW HR alarm and recording should be set just below the rate of Atrial
Fibrillation, so that when the patient converts, the slower rate (although not a true
Bradycardia) may result in an alarm and recording. The time of the recording will be
printed on the strip. The time will be stored as a history event and may be recalled if
the STORE function was enabled.