ECG

Question 1

What are the inferior leads? What artery supplies this territory?

Answer 1

II, III, AVF - Supplied by the right coronary artery

Question 2

What are the lateral leads? What artery supplies this territory?

Answer 2

I, AVL, V5, V6- Supplied by the left circumflex

Question 3

What are the septal leads? What artery supplies this territory?

Answer 3

V1 and V2- Left anterior descending

Question 4

What are the anterior leads? What artery supplies this area?

Answer 4

V3 and V4- Left anterior descending

Question 5

Which of the chest leads shows the RV?

Answer 5

V1 and V2

Question 6

Which of the chest leads shows the septum?

Answer 6

V3 and V4

Question 7

Which of the chest leads shows the left ventricle?

Answer 7

V5 and V6

Question 8

Which lead is also referred to as the rhythm strip?

Answer 8

Lead II

Question 9

What is the standard rate ECG machines run at?

Answer 9

25mm/s

Question 10

How long does a single large square represent?

Answer 10

A single large square is 5mm and represents 0.2s

Question 11

How many large squares make up a single second?

Answer 11

5

Question 12

How many large squares are in a minute?

Answer 12

5 large squares = 1 second

300 large squares= 60 seconds = 1 minute

Question 13

How much does one small square represent?

Answer 13

0.04s or 40ms

Question 14

Where is the PR interval measured from?

Answer 14

Start of the p wave to the beginning of the QRS complex

Question 15

What is the normal PR interval? What does it represent?

Answer 15

120-200 ms
Or 3-5 small squares

It represents the AV node delay (mostly)

Question 16

How can the heart rate be quickly calculated?

Answer 16

300 divided by the number of big squares (0.2s/200ms each) between each R wave

Question 17

What is the normal duration of the QRS complex?

Answer 17

120ms or 3 small squares- it is termed a broad QRS complex if it wider than this