Reading Leads

Question 1

Leads: II, III, aVF

Answer 1

Inferior Wall (Right Coronary Artery - RCA)

Common Conditions: Inferior MI, RCA occlusion

Question 2

Leads: V1-V4

Answer 2

Anterior Wall (Left Anterior Descending - LAD)

Common Conditions: Anterior MI, septal infarct (V1-V2), large anterior infarct (V3-V4)

Question 3

Leads: I, aVL, V5, V6

Answer 3

Lateral Wall (Left Circumflex Artery - LCx)

Common Conditions: Lateral MI

Question 4

Leads: V1, V2

Answer 4

Septal (Left Anterior Descending - LAD)

Common Conditions: Septal infarct

Question 5

Leads: Look for ST depression in V1-V4 (mirror image of ST elevation in posterior leads)

Answer 5

Posterior Wall (Posterior Descending Artery - PDA, branch of RCA or LCx)

Common Conditions: Posterior MI (confirm with posterior leads V7-V9)

Question 6

Leads: V4R (right-sided lead)

Answer 6

Right Ventricle (Right Coronary Artery - RCA)

Common Conditions: Right ventricular infarct (common with inferior MI)

Question 7

ST Elevation

Answer 7

Acute infarction (STEMI)

Question 8

ST Depression

Answer 8

Ischemia or reciprocal changes from an infarct elsewhere

Question 9

T Wave Inversion

Answer 9

Ischemia, evolving MI, pericarditis

Question 10

Pathologic Q Waves

Answer 10

Old infarction

Question 11

Wide QRS

Answer 11

Bundle branch block, ventricular rhythms

Question 12

Prolonged PR Interval

Answer 12

First-degree AV block

Question 13

Short PR Interval

Answer 13

Pre-excitation syndromes (e.g., WPW)