ECG stands for electrocardiogram. An ECG measures the electrical activity of the heart.
Impulses: SA node -> AV node -> Bundle of His -> Bundle branches -> Purkinje fibres
A normal 12-lead ECG should be set to run to 25mm/s.
The paper should have large squares with 5 small squares in between each large square.
1 small square represents 0.04 seconds
1 large square represents 0.2 seconds
5 large squares represent 1 second.
The ECG trace can be divided into waves and intervals. Each wave has its own letter – the P, Q, R, S & T waves.
Lead II gives us the best view of the electrical activity of the heart and is often used to analyse rhythm.
V1 and V2 look at the right ventricle
V3 and V4 look at the septum between the ventricles
V5 and V6 look at the anterior and lateral walls of the left ventricle
Anterior, inferior and lateral leads:
Leads I, aVL, V5 and V6 all give us a lateral view of the heart.
Leads II, III, and aVF give us an inferior view of the heart.
Leads V1, V2, V3, V4 gives us an anterior view of the heart.