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PMSC12004- ECG Basics Exam Study Guide
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PMSC12004- ECG Basics ExamStudy Guide
DepolarizationAnswer The electrical stimulation of the heart muscle which causes
contraction.
RepolarizationAnswer Rest and relax
Recovery of the heart muscle following contraction.
ElectriocardiogramAnswer A record of the electric activity of the heart.
ElectrodeAnswer External sensors placed on the skin to record the electrical activity of
the heart.
LeadAnswer The path of electrical conduction through the heart.
Sinoatrial (S-A) NodeAnswer The heart's natural pacemaker, initiates electrical impulse
for cardiac stimulation.
Atrioventricular (A-V) NodeAnswer The electrical pathway between the atria and
ventricles, it slows the stimulus of depolarization.
AtriumAnswer The smaller, upper chambers of the heart.
VentricleAnswer The larger, lower chambers of the heart.
P-WaveAnswer Represents the depolarization of both atria
QRS ComplexAnswer Represents the depolarization and contraction of both ventricles.
Q-waveAnswer First initial downward deflection on an ECG.
R-waveAnswer The first positive deflection on an ECG.
S-waveAnswer A downward deflection following a positive wave.
T-waveAnswer Represents the repolarization and relaxation of both ventricles
P-R IntervalAnswer The time it takes from initial atrial depolarization to ventricular
depolarization.
QRS IntervalAnswer The time necessary for depolarization of ventricular cells.
Q-T IntervalAnswer The time required for ventricular depolarization and repolarization.
Lead IAnswer Positive to Negative
, The path of electrical conduction through the heart between the left and right arm
electrodes.
Lead IIAnswer Negative to Positive
The path of electrical conduction through the heart between the right arm and left leg
electrodes.
Lead IIIAnswer Negative to Positive
The path of electrical conduction through the heart between the left arm and left leg
electrodes.
Lead aVRAnswer The path of electrical conduction through the heart between the
combination of left arm, left leg and right arm electrodes.
Lead aVLAnswer The path of electrical conduction through the heart between the
combination of right arm, left leg, and left arm electrodes.
Lead aVFAnswer The path of electrical conduction through the heart between the
combination of right arm, left leg and left arm electrodes.
Lead V1Answer The path of electrical conduction through the heart between the A-V
node and V1 electrode.
Lead V2Answer The path of electrical conduction through the heart between the A-V
node and V2 electrode.
Lead V3Answer Th path of electrical conduction through the heart between the A-V
node and V3 electrode.
Lead V4Answer The path of electrical conduction through the heart between the A-V
node and V4 electrode.
Lead V5Answer The path of electrical conduction through the heart between the A-V
node and V5 electrode.
Lead V6Answer The path of electrical conduction through the heart between the A-V
node and V6 electrode.
Bundle Branch BlockAnswer When on ventricle depolarizes slightly later than the other,
causing two "joined QRSs."
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