ECGs Flashcards
(34 cards)
How many limb leads are there?
three
Where does limb lead I look?
RA–> LA
Where does limb lead two look?
RA–> LL
Where does limb lead three look?
LA–>LL
What does the P wave show?
atrial depolarisation
What does the QRS complex show
ventricular depolarisation
What does the T wave show?
ventricular repolarisation
What does the PR interval show?
AV nodal delay
What does the ST segment show?
ventricular systole
What does the TP interval show?
diastole
What is a electrocardiograph?
The DEVICE used the record the potential differences between distant sites on the body surface
What is an electrocardiogram?
A recording of the potentail differences
What are the six ‘standard’ lateral looking leads?
VR, VL, VF
I, II, III
Where does VL, I and II look>
The left lateral surface of the heart
Where doe VF and III look?
The inferior surface
Where does VR look?
The atria
What leads look horizontally at the heart?
V1-V6
Where do leads V1 and V2 look?
Right ventricle
Where do leads V3 and V4 look?
Septum and the anterior wall of the left ventricle
Where do the leads V5-V6 look?
Anterior and lateral walls of the left ventricle
Which leads can determine the cardiac axis?
I, II, III
Where does the depolarisation usually spread?
From the 11 o, clock to 5 o’clock
What does a down ward deflection in lead I indicate?
Right axis deviation caused by right ventricular hypertrophy
What does a down ward deflection in he QRS of lead II and III indicate?
Left axis deviation
Left ventricular hypertrophy
