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NUR 339 ( LATEST 2024 / 2025 ) EXAM 5 | ALL Q&AS BRAND NEW GUARANTEED A++
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NUR 339 ( LATEST 2024 / 2025 ) EXAM 5 | ALL Q&AS BRAND NEW GUARANTEED A++
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NUR 339 Exam 51. What is coronary heart disease caused by?
Answer
impaired coronary blood flow
2. other names for coronary heart disease
Answer
ischemic heart disease or coronary artery disease
3. main cause of coronary heart disease
Answer
atherosclerosis
4. What dose coronary heart disease include?
Answer
angina myocardial infarction
cardiac dysrhythmias and conduction defects heart failure
sudden death
5. What structure do the left and right coronary arteries arise from?
Answer
aortic arch just past aortic valve
6. What does the left coronary artery split into?
Answer
left anterior descending artery circumflex
7. What does the left anterior descending artery supply?
Answer
the LV, ant. portion of septum, and the papillary muscle
,8. what does the circumflex supply?
Answer
left lateral wall of LV
9. What does the right coronary artery supply?
Answer
the SA node and RV
10. What is the SA nodes job?
Answer
pacemaker of the heart starts the impulse
11. what does the posterior descending artery supply?
Answer
the posterior septum, ventricle, and posterior papillary muscle
12. Where do the coronary arteries lie?
Answer
on the outside of heart with smaller branches moving thru to supply circulation to
subendocardium (inner layer of the heart)
13. When are the coronary arteries mostly perfused?
Answer
diastole
14. What are the coronary arteries affected by?
Answer
HR
Aortic pressure - autoregulation allows constant blood flow to coronary arteries at mean arterial
pressure of 60-180
15. What is the effect of tachycardia on coronary artery perfusion?
Answer
, shortens the diastolic time when it gets fast
not enough diastolic time = not enough time for heart to be perfused (ischemic)
16. What is the effect of severe hypotension on coronary artery perfusion?
Answer
-
decreased coronary artery perfusion
17. metabolic control of coronary circulation
Answer
heart muscle needs fatty acids & aerobic metabolism to meet energy needs
blood flow regulated by O2 needs of myocardium
18. how do periods of strenuous exercise affect the blood flow thru the coro- nary arteries?
Answer
coronary arteries can increase blood flow 4-5 x to meet demands needed
19. What is released from the myocardial cells in response to decrease O2 supply r/t demand?
Answer
metabolic mediators (K, lactic acid, CO2, & adenosine) cause vasodilation
20. What factors are secreted by endothelial cells lining the coronary arteries that affect blood
flow?
Answer
vasodilating factors
vasoconstricting factors anti-thrombogenic factors
21. When is nitric oxide released (vasodilating factors)?
Answer
when the endothelium comes in contact with aggregating platelets, thrombin, products of mast
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