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Glossary
AHA. An abbreviation for American Heart Association. The AHA electrode labeling scheme is most
commonly used in the United States.
Auto ECG. A report typically showing a 10-second acquisition of 12 leads of ECG information combined
with patient data, interpretation, and measurements matrix. See also Rhythm ECG.
average cycles. Dominant waveforms for all 12 leads. Printed on a separate page, if enabled.
CardioPerfect workstation. A PC using Welch Allyn CardioPerfect software. Stores ECG and spirometry
test data. Can communicate with other electronic patient-information systems, such as billing and
medical records.
confirmed, unconfirmed. Status of an Auto ECG report’s interpretation. Indicates whether the report has
been reviewed and accepted by a qualified physician.
electrocardiogram (ECG). A record of the electrical currents associated with heart muscle activity.
Sometimes called EKG for the German term, Elektrokardiogramm. See also Auto ECG; Rhythm ECG.
electrocardiograph. An instrument used to create electrocardiograms (ECGs).
extended measurements. Values for several common parameters, such as Q, R, and S amplitude and
ST values. The amplitudes are expressed in microvolts. The durations are expressed in milliseconds.
The measurements cannot be edited. Printed on a separate page, if enabled.
IEC. An abbreviation for International Electrotechnical Commission. The IEC electrode labeling scheme is
most commonly used in Europe.
lead. (1) An electrocardiograph wire connected to an electrode, which is attached to a patient’s skin. There
are 10 lead wires. (2) A waveform that represents ECG data from a particular view of the heart. The
data from the 10 lead wires is converted into 12 waveforms, also called leads: I, II, III, aVR, etc.
MEANS. An acronym for modular ECG analysis system. The optional MEANS interpretation algorithm,
developed by the University of Rotterdam, Netherlands, provides automatic analysis of ECG tests.
Also available in pediatric version: PEDMEANS.
PEDMEANS. See MEANS.
Power-Save. A user-selectable feature that automatically turns the electrocardiograph off after several idle
minutes.
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