12 lead ecg
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18 Terms
how many electrodes vs leads are there in a 12-lead ecg
10 electrodes; creates 12 leads (views)
what are the limb electrodes
right arm, left arm, right led, left leg
what leads come from limb electrodes
I, II, III, aVR, aVL, aVF
what are the precordial (chest) leads
V1-V6
which leads look at the inferior wall
II, III, aVF
which artery supplies the inferior wall
RCA
which leads look at the lateral wall
I, aVL, V5, V6
which artery supplies the lateral wall
LCX
which leads look at the anterior wall
V1-V4
which artery supplies the anterior wall
LAD
which leads suggest a posterior wall MI
V1-V2
what does ST elevation in II, III, aVF indicate
inferior MI (usually RCA)
why is ECG important in chest pain
it identifies ischemia/ MI and guides which artery is blocked
what urgent treatment may follow STEMI detection
angioplasty or stent placement (cath lab)
what rhythm has no P waves and irregular R-R intervals
atrial fibrillation
what is a key feature of atrial fibrillation
irregular rhythm
what part of the heart does a 12 lead ECG mainly assess
left ventricle
when might you need more than 12 leads
to assess the right ventricle (18 lead)
