macintosh
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A 67-year-old man presents to the emergency department with diaphoresis and crushing chest pain that radiates down his left arm. An ECG is performed and shows ST elevations and inverted T waves. His troponin level is high. He is taken to the cardiac catheterization unit, where he is diagnosed with an obstructive myocardial infarction due to a blockage in his left anterior descending artery (LAD). Which of the following best describes the area of myocardium supplied by the LAD?
© A. Anterior wall and interventricular septum
O B. Atrioventricular node and posterior septum
© C. Left atrium and left ventricle
© D. Right atrium and posterior wall
O E. Right ventricle and apex
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| maoudoody
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a
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| macintosh
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The correct answer is A. The left anterior descending artery branches from the left main coronary artery as it approaches the atrioventricular junction. It descends towards the apex on the anterior wall ofthe heart between the right and left ventricles and supplies the anterior wall of both ventricles and most ofthe interventricular septum.
B is not correct. The right main coronary artery course s around to the posterior wall of the heart and supplies the atrioventricular node and posterior interventricular septum.
C is not correct. The circumflex artery branches from the left main coronary and courses superiorly-posteriorly between the left atrium and ventricle to supply both of these areas.
D is not correct. The right main coronary artery branch es from the aorta near the superior vena cava and hugs the right atrium as it courses toward the posterior side of the heart. It is the main supply to the right atrium and posterior wall ofthe heart.
E is not correct. The right marginal artery is a branch of the right main coronary on the inferior-anterior surface of the heart and supplies the right ventricle and apex.
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| macintosh
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I do not understand the explanation regarding choice E (i.e. The right marginal artery is a branch of the right main coronary on the inferior-anterior surface of the heart and supplies the right ventricle and apex). From my understanding the left ventricle (and not the right) forms the cardiac apex, and therfore the artery most likely to supply the cardiac apex is also the LAD (and not the right marginal artery as stated in the given explanation). Please correct me if I am wrong.
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| ramireddy
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| lakshya_0_7
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the apex is supplied by LAD....and the marginal branch of RCA supplies most of the right ventricle......the statement E is wrong
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