Cardiology Flashcards
Which leads are the standard (Bipolar) leads?
I, II, III (limb leads)
Which leads are the augmented leads?
aVR, aVL, aVF
Which leads are the chest (precordial)?
V1-V6
Lead I views which area of the heart?
And how does it read the difference in potential?
Views lateral wall of left ventricle.
Electrical potential between left arm (+) and right arm (-)
Lead II views which area of the heart?
And how does it read the difference in potential?
Views inferior surface of left ventricle.
Electrical potential between left leg (+) and right arm (-)
Lead III views which part of the heart?
And how does it read the difference in potential?
Views inferior surface of left ventricle.
Electrical potential between left leg (+) and left arm (-)
Which lead is considered the diagnostic lead?
Lead II
Augmented limb leads (aVR, aVL, aVF) ?
• A =
• V =
• R =
• L =
• F =
Augmented
Voltage
Right arm
Left arm
Foot (usually left leg)
Where does lead aVR view the heart and from which part of the body?
Views the hear from the right shoulder and does not view any wall of the heart.
Where does lead aVL view the heart and from which part of the body?
Views the heart from the left shoulder and is oriented to the lateral wall of the left ventricle.
Where does lead aVF view the heart and from which part of the body?
Views the heart from the left foot (leg).
Views the inferior surface of the left ventricle.
V1 lead placement and heart surface viewed?
Right side of sternum, 4th intercostal space.
Septum
V2 lead placement and heart surface viewed?
Left side of sternum, 4th intercostal space.
Septum
V3 lead placement and heart surface viewed?
Midway between V2 and V4.
Anterior
V4 lead placement and heart surface viewed?
Left midclavicular line, 5th intercostal space
Anterior
V5 lead placement and heart surface viewed?
Left anterior axillary line, same level as V4
Lateral
V6 lead placement and heart surface viewed?
Left midaxillary line, same level as V4
Lateral
Baseline (isoelectric line) (define)
A straight line recorded when electrical activity is not detected.
Waveform (define)
Movement away from the baseline in either a positive (upward) or negative (downward) direction.
If the wave of depolarization moves toward the positive electrode, which way will the waveform be recorded?
Upright
If the wave of depolarization moves toward the negative electrode, which way will the waveform be recorded?
Upside down (inverted)
What is the width and height of the smallest square on an ECG paper?
1mm x 1mm
How much time is measured by the smallest box on ECG paper?
0.04 sec
How much time is measured by one big box on ECG paper?
0.2 sec
