Occlusions Arteries in Myocardial Infarction

Question 1

Occlusion in the anterior descending branch of the left coronary artery results in infarction of

Answer 1

the anterior left ventricle and the interventricular septum.

Question 2

Occlusion of the left circumflex artery produces

Answer 2

anterolateral or posterolateral infarction

Question 3

Right coronary thrombosis leads to infarction of the

Answer 3

posteroinferior portion of the left ventricle and may involve the right ventricular myocardium and interventricular septum

Question 4

“Systolic function of the heart is determined by four major determinants:

Answer 4

(1) the end-diastolic volume and the resultant fiber length of the ventricles prior to onset of the contraction (preload),
(2) the impedance to left ventricular ejection (after-load),
(3) the contractile state of the myocardium (contractility), and
(4) the rate of contraction, or heart rate (chronotropy)