_____________________________________________________________________________Glossary
Glossary
TERM DEFINITION
Augmented lead (aVL, aVR, aVF) The difference between
one site and the average of the potential
of two other sites; unipolar extremity
leads.
Baseline drift The QRS complexes are present, but the
baseline wanders due to poor
skin/electrode contact and/or patient
movement.
Bradycardia A slow heart rate.
Calibration pulse Standardization pulse. A base to
compare the relationship of QRS
complexes to one another.
Gain An increase in amount, magnitude or
degree.
J point The end of the QRS complex; the point
where the QRS ends and the ST
segment begins (QRS offset).
Limb lead Bipolar lead that represents the
differences of electrical potential between
two selected sites (leads I, II, III).
Muscle noise Grossly uneven baseline caused by
patient body tremor or other muscle
movement. The artifact may be so large
that it overtakes the complex.
Precordial leads (V1-V6) Unipolar chest leads.
Premature atrial complex (PAC) An arrhythmia that has its origin in the
atrium.
Premature Ventricular Complex (PVC) An arrhythmia that has its origin in the
ventricle.
ST depression The amount of ST deviation below the
baseline.
ST elevation The amount of ST deviation above the
baseline.
ST level The numerical value of the measured ST
segment in microvolts.
ST segment Ventricular repolarization. The end of the
S wave (J point) to the beginning of the T
wave.
Tachycardia A rapid heart rate.
G-1
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