ECG

Question 1

What does the p-wave represent

Answer 1

Atrial depolarisation

Question 2

What causes the p-wave

Answer 2

SA node

Question 3

How many squares is 1 second

Answer 3

5

Question 4

What does 5 big squares on the graph represent

Answer 4

1s

Question 5

What does 1 big square represent

Answer 5

0.2 seconds (200ms)

Question 6

What is 0.2s on the graph

Answer 6

1 big square or 5 small squares

Question 7

What is 5 small squares

Answer 7

0.2 seconds

Question 8

What is 0.04 s (40ms)

Answer 8

1 small square

Question 9

What is 1 small square

Answer 9

0.04 s 40ms)

Question 10

What are the typical settings on a voltage time graph

Speed
Voltage

Answer 10

Speed = 25 mm/sec

Voltage = 10 mm/mV

Question 11

What voltage does one big square represent

Answer 11

0.5 mV

Question 12

What voltage does 2 big squares represent

Answer 12

1 mV

Question 13

Used a voltage time graph how do you calculate rate (bpm)

Answer 13

300/no. of large squares between cardiac cycle

OR

cycles in 10 seconds x 6

Question 14

What is the equation of Ohm’s law

Answer 14

V = IR

Voltage = current x resistance

Question 15

On an ECG lead what does a positive deflection show

Answer 15

Net current flow towards lead

Question 16

On an ECG what does a baseline/isoelectric point show

Answer 16

No net current flow in direction of lead

Question 17

On an ECG what does a negative deflection show

Answer 17

Nett current flow away from lead

Question 18

What is the normal value of the PR interval

Answer 18

120-200 ms

3-5 small squares

Question 19

What does a long PR interval show

Answer 19

1st degree heart block

Delayed AV conduction

Question 20

What is the normal range for QRS complex

Answer 20

Less than 120ms

3 small squares

Question 21

What is the QR interval a measure of

Answer 21

Time to ventricular repolarisation

Question 22

What is the QR interval

Answer 22

Time from onset of QRS to end of T

Question 23

What is the normal valve for QT interval for men

Answer 23

350-440 ms

Question 24

What is the normal value of QT interval for women

Answer 24

350-460 ms

Question 25

What does the PR segment represent

Answer 25

Av node holding charge

Question 26

What does the QRS wave represent

Answer 26

Ventricular depolarisation

Question 27

What does the T-wave represent

Answer 27

Ventricular repolarisation

Question 28

How many leads does an ECG have

Answer 28

12

Question 29

What is the division of the 12 leads

Answer 29

3 bipolar limb leads V1, V2, V3

3 Augmented unipolar limb leads avF, avR, avL

6 precordial (chest leads) V1-6

Question 30

Which leads look at the heart in a frontal plane

Answer 30

bipolar and augmented

Question 31

What leads look at the heart in a horizontal section

Answer 31

precordial

Question 32

Where is lead I

Answer 32

RA to LA

Question 33

Where is lead II

Answer 33

RA to LL

Question 34

Where is lead III

Answer 34

LA to LL

Question 35

What is Lead I looking at

Answer 35

Left/lateral heart

Question 36

Where is lead II and III looking at

Answer 36

Inferior heart

Question 37

How do you think leads are looking at the heart

Answer 37

From positive to negative

Question 38

Where is electrode AVR looking

Answer 38

Right side of heart

Question 39

Where is electrode AVF looking

Answer 39

Inferior side of heart

Question 40

Where does electrode AVL looking

Answer 40

Left and lateral side

Question 41

What is the placement of the 6 precordial/chest leads

Answer 41

V1 - 4th intercostal space R
V2 - 4th intercostal space L

V4 - 5th intercostal space L

V6 - 5th intercostal midaxillary line

Question 42

What does V1/2 pick up

Answer 42

Intraventricular septum

Question 43

What does V3/4 pick up

Answer 43

Anterior wall

Question 44

What does V5/6 pick up

Answer 44

Left lateral wall