ECGs and their Interpretation (Session 7)

Question 1

What is an ECG?

Answer 1

electrical changes over time recorded via electrodes placed on limbs and chest wall and transcribed to graph paper producing electrocardiogram (ECG)

Question 2

All cardiac cells are electrically connected through …

Answer 2

gap junctions

Question 3

Depolarisation wave causes coordinated contraction of atria and ventricles. This is called …

Answer 3

excitation-contraction coupling

Question 4

After the electrical activity spread in the atria, the bundle of His goes into the … This finishes in the Purkinje fibres which are …

Answer 4

left and right bundle branches;
extensive network of large, fast conducting myocyte fibres

Question 5

The SA node sets the … which is where …

Answer 5

sinus rhythm which is where there’s a P wave before every QRS complex

Question 6

What’s an ECG lead?

Answer 6

graphical representation of the heart’s electrical activity calculated by analysing data from several ECG electrodes

Question 7

Different leads represent … of electrical activity of different parts of heart

Answer 7

Views

Question 8

How many electrodes are there and where are they?

Answer 8

10: 4 on limbs, 6 on chest