ECG

Question 1

Limb leads look at the events in the

Answer 1

vertical or frontal plain

Question 2

Standard limb lead II records from the

Answer 2

right arm to left leg

Question 3

P wave

Answer 3

atrial depolarisation

Question 4

QRS complex

Answer 4

ventricular depolarisation

Question 5

T wave

Answer 5

ventricular repolarisation

Question 6

PR interval (time from atrial to ventricular depolarisation) is mainly due to the

Answer 6

transmission through the AV node

Question 7

QRS is the time taken for

Answer 7

the whole of the ventricle to depolarise

Question 8

QT interval is the

Answer 8

time spent while the ventricles are depolarised

Question 9

T wave is positive (upwards) because

Answer 9

a wave of depolarisation is moving AWAY from the recording electrode - so produced a positivity blip

Question 10

Why is the R wave bigger in SLLII than in SLLI and SLLIII?

Answer 10

the main vector of depolarisation is in line with the axis of recording from the left leg with respect to the right arm

Question 11

chest leads look at the same events but in

Answer 11

horizontal (transverse) plane

Question 12

1 large square on the rhythm strip is

Answer 12

0.2 secs

Question 13

60-100 beats per minute is

Answer 13

normal

Question 14

less than 60 beats per minute is

Answer 14

bradycardia

Question 15

above 100 beats per minute is

Answer 15

tachycardia

Question 16

PR too short is less than

Answer 16

0.12 secs

Question 17

PR interval too long is more than

Answer 17

0.2 secs

Question 18

is the QRS complex too wide? more than

Answer 18

0.12 secs

Question 19

is the QT interval too long? more than

Answer 19

0.42 secs at 60bpm

Question 20

STEMI

Answer 20

st elevated myocardial infarction

Question 21

NSTEMI

Answer 21

non-ST elevated myocardial infarction