7. The Electrocardiogram

Question 1

What creates the Q wave?

Answer 1

Septal depolarisation and spreading

Question 2

What creates the R wave?

Answer 2

Main ventricular depolarisation

Question 3

What creates the T wave?

Answer 3

Ventricular repolarisation

Question 4

Why doesn’t atrial repolarisation create a wave?

Answer 4

Lost in QRS complex

Question 5

Depolarisation moving towards the lead causes what wave to be produced?

Answer 5

Big wave upwards

Question 6

Repolarisation moving towards the lead causes what wave to be produced?

Answer 6

Big downwards wave

Question 7

How do you calculate rate using an ECG trace?

Answer 7

300/number of squares in R-R interval Use a larger interval if rhythm is irregular

Question 8

What creates the P wave?

Answer 8

Atrial depolarisation

Question 9

What condition can cause this ECG?

Answer 9

Atrial Fibrillation

Question 10

What condition can cause this ECG?

Answer 10

Ventricular Fibrillation

Question 11

What condition can cause this ECG?

Answer 11

1st degree heart block

Question 12

What condition can cause this ECG?

Answer 12

Type 1 second degree heart block

Question 13

What condition can cause this ECG?

Answer 13

Type 2 Second degree heart block

Question 14

What condition can cause this ECG?

Answer 14

3rd degree heart block

Question 15

What condition can cause this ECG?

Answer 15

Bundle branch block