User manual

Glossary-1
November 21, 2000 10:57 am DRAFT
Glossary
Glossary
AC filter: a filter that screens out ECG artifact
caused by AC power line interference. This filter is
built into the cardiograph and cannot be disabled.
AC line interference: electrical signals
originating from the alternating current carried by
power cords or other electrical equipment. AC line
interference may obscure important details of the
ECG trace.
adult criteria: interpretative rules used when
analyzing ECGs of persons aged 16 years or older.
AHA leads: ECG lead names and identifying colors
recommended by the American Heart Association.
Limb leads are labeled RA, LA, LL, RL. Chest leads
are labeled V1 through V6. (See IEC leads)
alternating current (AC): electrical current
provided by wall outlets. AC may be either 60 or 50
Hz depending on the country.
analysis criteria: rules used to interpret ECGs.
artifact: ECG waveform distortion that may
diminish ECG quality. ECG artifact (or noise) may be
caused by electrical interference, poor electrode
connections, or patient movement.
artifact filter: Agilent term for the filter that
screens out ECG noise caused by muscle tremor.
Auto ECG: Twelve-lead ECG which shows 10
seconds of heart activity and is printed in a preselected
format.
baseline wander: the slow drifting of the ECG
baseline up or down during the ECG recording. It may
be caused by patient respiration, footfall or other
sources.
baseline wander filter: Agilent term for the
configurable filter that reduces baseline wander.
battery saver: Agilent term for the cardiograph
automatically turning itself to off after 10 minutes of
cardiograph inactivity to conserve power.
calibration pulse: a 200 ms, 1 mV square or
stepped wave pulse which appears on the printed
report, showing the sensitivity at which the ECG was
recorded.
chest leads: leads V1 through V6 (AHA), or C1
through C6 (IEC).
configuration: the manner in which the
cardiograph is programmed to function.
cycle power: Press the button to put the
cardiograph off, then press the button again to turn
the cardiograph back on.
direct transmission: moving data between a
cardiograph and an Agilent ECG Manager system.
directSCP: direct transmission using the Standard
Communication Protocol, as described in the
European Committee for Standardization, Standard
Communications Protocol - Computer - Assisted
Electrocardiography, (CEN/TC 251).
ECG analysis: the computerized process for
measuring and interpreting an Auto ECG.
ECG report: the paper copy produced by the
cardiograph. This report includes a graphic
representation of the heart’s electrical activity (ECG
waveforms) and identifying information. It may also
include interpretive information produced by the
analysis software. ECG reports must be overread by
qualified physicians.
front panel: the area of the cardiograph that
includes the preview display and keyboard.
Hertz (Hz): a unit of frequency equal to one cycle
per second.
ID fields: Agilent term for the areas where patient
information can be entered. Using the ID fields, you
can enter information such as the patient identification
number, age, and sex.
IEC leads: lead names and identifying colors
recommended by the International Electrotechnical
Commission standard. IEC limb electrodes are
labelled R, L, F, and N. Chest electrodes are labeled
C1 through C6.