ECG

Question 1

What is meant by sinus rhythm on an ECG?

Answer 1

presence of P waves

Question 2

What do the following represent on an ECG?
- P wave
- QRS complex
- T wave

Answer 2

P = atrial depolarisation
QRS = ventricular depolarisation
T = ventricular repolarisation

Question 3

If there is ST elevation in V3 and V4 leads, where was the MI?

Answer 3

In the anterior section of the heart, left anterior descending artery.

Question 4

Which leads correspond with the right coronary artery/ inferior view of heart?

Answer 4

II, III, aVF

Question 5

Which leads correspond with the lateral view of the heart/ left circumflex artery?

Answer 5

V1-V6, aVL

Question 6

If there is an ST elevation in leads V1-V3, where was the MI?

Answer 6

posterior, left circumflex or right coronary artery

Question 7

Which leads correspond to the proximal left anterior descending artery?

Answer 7

V1-6, I, aVL

Question 8

What ECG changes are seen in a STEMI?

Answer 8

horizontal ST depression
tall, broad R waves
upright T waves
dominant R wave in V2

Question 9

What ECG features are seen in hypokalaemia?

Answer 9

U waves
small or absent T waves
prolonged PR interval
ST depression
long QT

Question 10

What ECG features are seen in hyperkalaemia?

Answer 10

peaked or tall tented T waves
loss of P waves
broad QRS complexes
sinusoidal wave pattern
ventricular fibrillation

Question 11

How do you tell the difference between left and right bundle branch blocks?

Answer 11

left - W in V1 and M in V6
right - M in V1 and W in V6

Question 12

What may right bundle branch block represent?

Answer 12

common with increasing age
right ventricular hypertrophy
pulmonary embolism
myocardial infarction