ECG LEADS AND LOCATION

Question 1

V1

Answer 1

4th ICS, right parasternal border

Question 2

V2

Answer 2

4th ICS, left parasternal border

Question 3

V3

Answer 3

Between V2 and V4

Question 4

V4

Answer 4

5th ICS, left midclavicular line

Question 5

V5

Answer 5

5th ICS, left anterior axillary line

Question 6

V6

Answer 6

5th ICS, left midaxillary line

Question 7

V7

Answer 7

Left posterior axilary line

Same horizontal plane as V4-V6

Question 8

V8

Answer 8

Midscapular

Same horizontal plane as V7 and V9

Question 9

V9

Answer 9

Left paraspinal border

Same horizontal plane as V4 to V6

Question 10

Requested in patients with suspected LV posterior wall infarct

Answer 10

V7,V8, V9

Question 11

Requested in patients with suspected right ventricular infarct

Answer 11

V4R, V5R and V6R

Question 12

V4R

Answer 12

5th ICS, right midclavicular line

Question 13

V5R

Answer 13

5th ICS, right anterior axillary line

Question 14

V6R

Answer 14

5th ICS, right midaxillary line

Question 15

Reflects atrial depolarization

Answer 15

P wave

Question 16

Reflects the conduction of the atria to the ventricles

Answer 16

PR interval

Question 17

Distance between the onset of the p-wave and the onset of QRS complex

Answer 17

PR interval

Question 18

Serves as the reference isoelectric line of the ECG

Answer 18

PR segment

Question 19

Starts at the end of the p-wave and ends at the onset of QRS complex

Answer 19

PR segment

Question 20

Represents ventricular depolarization

Answer 20

QRS complex

Question 21

The first negative wave (should be) is the

Answer 21

Q wave

Question 22

If the first wave is not negative, then QRS complex

Answer 22

QRS complex does not possess a Q wave

Question 23

The first positive wave is the

Answer 23

R wave

Question 24

Corresponds to the plateau phase (phase 2 ) of cardiomyocyte action potential

Answer 24

ST segment

Question 25

Point where the ST segment starts

Answer 25

J-point

Question 26

Represents rapid repolarization of contractile cells

Answer 26

T-wave

Question 27

QT interval

Answer 27

Onset of QRS complex to the end of the T-wave

Question 28

Reflects the duration of both ventricular depolarization and repolarization

Answer 28

QT-interval

Question 29

Implies that the wave is included

Answer 29

Interval

Question 30

Describes a normally isoelectric portion of the ECG

Answer 30

Segmentq

Question 31

Standard ECG measurements run at

Answer 31

25mm / second

Question 32

ECG is a plot of ___ over _____

Answer 32

Voltage over time