Glossary - Welch Allyn CP 20 User Manual

_____________________________________________________________________________Glossary

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