The Coronary Arteries
Coronary arteries and arterial territories The two main coronary arteries emanate from the aortic bulb ( Figure 1 ): The right coronary artery ( RCA ) originates on the right aspect of the aortic bulb. The left main coronary artery ( LMCA ) originates from the left anterior aspect of the aortic bulb. The LMCA is short and branches into the two arteries supplying the anterior and left side of the heart, as follows: The left anterior descending coronary artery ( LAD ). The left circumflex coronary artery ( LCX ). Figure 1 shows the coronary arteries and their relation to the ECG leads . Note that Figure 1 is a right-dominant system (i.e PDA is supplied from RCA). Figure 1. The coronary arteries and their relation to the ECG leads . Localization of myocardial infarction / ischemia is done by using ECG changes to determine the affected area and subsequently the occluded coronary artery (culprit). Figure 2 shows the coronary arterial territories in relation to the 17 segments of the left ventricle.
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