ECG LEADS AND LOCATION Flashcards
V1
4th ICS, right parasternal border
V2
4th ICS, left parasternal border
V3
Between V2 and V4
V4
5th ICS, left midclavicular line
V5
5th ICS, left anterior axillary line
V6
5th ICS, left midaxillary line
V7
Left posterior axilary line
Same horizontal plane as V4-V6
V8
Midscapular
Same horizontal plane as V7 and V9
V9
Left paraspinal border
Same horizontal plane as V4 to V6
Requested in patients with suspected LV posterior wall infarct
V7,V8, V9
Requested in patients with suspected right ventricular infarct
V4R, V5R and V6R
V4R
5th ICS, right midclavicular line
V5R
5th ICS, right anterior axillary line
V6R
5th ICS, right midaxillary line
Reflects atrial depolarization
P wave
Reflects the conduction of the atria to the ventricles
PR interval
Distance between the onset of the p-wave and the onset of QRS complex
PR interval
Serves as the reference isoelectric line of the ECG
PR segment
Starts at the end of the p-wave and ends at the onset of QRS complex
PR segment
Represents ventricular depolarization
QRS complex
The first negative wave (should be) is the
Q wave
If the first wave is not negative, then QRS complex
QRS complex does not possess a Q wave
The first positive wave is the
R wave
Corresponds to the plateau phase (phase 2 ) of cardiomyocyte action potential
ST segment
Point where the ST segment starts
J-point
Represents rapid repolarization of contractile cells
T-wave
QT interval
Onset of QRS complex to the end of the T-wave
Reflects the duration of both ventricular depolarization and repolarization
QT-interval
Implies that the wave is included
Interval
Describes a normally isoelectric portion of the ECG
Segmentq
Standard ECG measurements run at
25mm / second
ECG is a plot of ___ over _____
Voltage over time
