Acute Coronary Syndrome (ACS) - Arterial Supply

Question 1

Main Coronary Arteries of the Heart (2).

Answer 1

1. LCA (Left Coronary Artery) divides into LCA and LAD.

2. RCA curves around the right side and under the heart.

Question 2

What do the branches of the Coronary Artery supply?

Answer 2

1. RCA - Right Atrium, Right Ventricle, Inferior Aspect of Left Ventricle, Posterior Septal Area.
2. LCA - Left Atrium and Posterior Aspect of Left Ventricle.
3. LAD - Anterior Aspect of Left Ventricle and Anterior Aspect of Septum.

Question 3

ECG Leads of Each Coronary Artery/Branch (3).

Answer 3

1. LAD - V1-V4.
2. LCA - I, aVL, V5-V6.
3. RCA - II, III, aVF.

Question 4

ECG Changes in Aspects of the Heart (5).

Answer 4

1. Anteroseptal - V1-V4.
2. Inferior - II, III, aVF.
3. Anterolateral - I, aVL, V4-V6.
4. Lateral - I, aVL, V5-V6.
5. Posterior - V1-V3 : Tall R Waves.

Question 5

What changes are seen in the posterior heart? (2D)

Answer 5

1. Reciprocal changes are seen :
1A. Horizontal ST Depression.
1B. Tall Broad R Waves.
1C. Upright T Waves.
1D. Dominant R Wave in V2.
2. ST Elevation and Q Waves in Posterior Leads V7-V9.