ECGs

Question 1

lead colour and where does it get stuck to: V1

Answer 1

red

4th IC space R sternal edge

Question 2

lead colour and where does it get stuck to: V2

Answer 2

yellow

4th IC space L sternal edge

Question 3

lead colour and where does it get stuck to: V3

Answer 3

green

midway between V2 and V4

Question 4

lead colour and where does it get stuck to: V4

Answer 4

brown

5th IC space midclavicular line

Question 5

lead colour and where does it get stuck to: V5

Answer 5

black

left anterior axillary line, same level V4

Question 6

lead colour and where does it get stuck to: V6

Answer 6

mauve

left mid axillary line, same level V4 and V5

Question 7

red limb lead

Answer 7

right ulnar styloid process

Question 8

yellow limb lead

Answer 8

left ulnar styloid process

Question 9

green limb lead

Answer 9

left medial malleolus

Question 10

black limb lead

Answer 10

right medial malleolus

Question 11

what do 5 large squares =

Answer 11

one second

Question 12

what does 1 large large square =

Answer 12

0.2s

Question 13

what does 1 little square =

Answer 13

0.04s

Question 14

what does P wave correspond to

Answer 14

atrial depolarisation

Question 15

what does QRS complex correspond to

Answer 15

ventricular depolarisation

Question 16

what does T wave correspond to

Answer 16

ventricular repolarisation

Question 17

PR interval

Answer 17

time from atrial depolarisation to ventricular depolarisation
should be 0.12-0.2s (3-5 little squares)

Question 18

QRS complex

Answer 18

time for whole of ventricle to depolarise

should be <0.12s (< 3 little squares)

Question 19

QT interval

Answer 19

time spent in ventricular depolarisation and repolarisation

should be max 0.42s

Question 20

ARI BAR

Answer 20

any electrical activity?
rate 
irregular or regular
broad or narrow QRS complexes
atrial activity 
relationship between P waves and QRS complexes

Question 21

calculating ventricular rate

Answer 21

count number of QRS complexes in 30 big squares.

times the number by 10

Question 22

determining whether or not QRS complexes are irregular or regular

Answer 22

mark 3 on bit paper and slide paper along to check the next 3 line up

Question 23

is QRS complex broad or narrow

Answer 23

3 or less little squares

if so then means impulse was initiated and atrioventricular node = normal

Question 24

broad QRS complexes

Answer 24

> 3 little squares (>0.12s)

impulse has arisen from ventricles - not depolarised normally

Question 25

checking for atrial activity and relationship between P waves and QRS complexes

Answer 25

are there P waves?
is there a P wave before each QRS and a QRS after each P wave
PR interval - should be 3-5 little squares

Question 26

1st degree heart block

Answer 26

prolonged PR interval (>5 small squares)

Question 27

2nd degree heart block

Answer 27

there is a relationship between P and QRS but is variable

Question 28

3rd degree heart block

Answer 28

no relationship between P and QRS