Electrocardiography

Question 1

Which leads will you look for the primary ECG changes for an inferior myocardial infarction, and what vessels are likely involved?

Answer 1

Leads II, III and aVF

Right coronary artery

Question 2

Which leads will you look for the primary ECG changes for a septal myocardial infarction, and what vessels are likely involved?

Answer 2

V₁ and V₂

Left anterior descending coronary artery

Question 3

Which leads will you look for the primary ECG changes for an anterior myocardial infarction, and what vessels are likely involved?

Answer 3

V3 and V4

Left anterior descending coronary artery

Question 4

Which leads will you look for the primary ECG changes for an anteroseptal myocardial infarction, and what vessels are likely involved?

Answer 4

V1-V4

Left anterior descending coronary artery

Question 5

Which leads will you look for the primary ECG changes for an extensive anterior myocardial infarction, and what vessels are likely involved?

Answer 5

I, aVL, V1-V6

Left anterior descending coronary artery

Question 6

Which leads will you look for the primary ECG changes for a lateral myocardial infarction, and what vessels are likely involved?

Answer 6

I, aVL, V5-V6

Circumflex artery

Question 7

Which leads will you look for the primary ECG changes for a high lateral myocardial infarction, and what vessels are likely involved?

Answer 7

I, aVL

Circumflex artery

Question 8

Which leads will you look for the primary ECG changes for a posterior myocardial infarction, and what vessels are likely involved? What other location is usually affected?

Answer 8

Prominent R in V1

Right coronary artery or circumflex artery

Posterior infaction is usually associated with inferior or lateral infarction

Question 9

Which leads will you look for the primary ECG changes for right ventricular myocardial infarction, and what vessels are likely involved?

Answer 9

ST elevation V1 and more specifically V4R in setting of inferior infarction

Right coronary artery