Coronary Arteries

and the 12 lead ECG By M.elkhatib

Coronary Anatomy

The coronary arteries arise from the to openings in the aorta called right and left ostiums.

The blood then passed through the coronary arteries to the cardiac muscle

The de oxygenated blood is returned to the heart via a network of coronary veins, arterioles and capillaries through the coronary sinus to the right atrium.

Coronary Circulation

Coronary artery blockage

Initial assessment is done via an ECG

The ECG can tell us which part of the heart muscle is ischemic or damaged

This also corresponds with which coronary arteries are affected

Occlusion

The right coronary artery supplies The right ventricle, inferior and posterior

wall It also supplies the SA and AV node

RCA

Supplies the anterior and septal wall of the left ventricle

Left anterior descending

Supplies the posterior wall Lateral wall Inferior wall (in 10% of the population

Left circumflex

Electrocardiographic views of the heart

Electrocardiographic views of the heart

ST segment point of interest when thinking about myocardial ischemia or injury

Complex

Ischemia - ST depression and T wave inversion

Injury - ST elevation Infarction - ST elevation Q Wave - old infarct

ST Changes

Action Potential

Action Potential

The exchange of pottasium and sodium is what leads to an electrical impulse

Ion Channels

Questions