guangyu
Forum Elite
Topics: 29
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please explain
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| mohamed.ali
Forum Junior
Topics: 12
Posts: 39
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BBBB.. Decreasing myocardial contractility
Beta blocker is very effective and proven to decrease the mortality rate after MI and decrease the incidence of re -infarction in the future
this is because it make the heart to work by a slower rate
- it decrease the heart rate and the cardiac contarctily ,so decrease the cardiac work, deacrease the oxygen supply needed for the myocardium ,decrease the possibility for future MI
- also the beta blocker increase the diastolic filling so ,increasing the Ejection fraction of the heart .increasing the C.O.P so better myocardial blood supply
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| mildus
Forum Guru
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B.
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| guangyu
Forum Elite
Topics: 29
Posts: 308
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but the answer is C
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| mildus
Forum Guru
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Beta blockers don't dilate coronary arteries, but they can constrict peripheral arteries since they block vascular beta 2 receptors which mediate vasodilatation (that is why BB are contraindicated in peripheral vascular disease).
Beta blockers are useful since they block beta 1 receptors, thus decrease HR (don't forget that tachycardia and wall stress are two major factors for oxygen consumption in the heart) = decrease need for O2, also protect from toxic effect of cateholamines
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| farnsworth
Forum Newbie
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beta receptor blockers are not strictly contraindicated in peripheral vascular disease. The benefits outweigh the adverse effects in many of these patients, as they usually also have CAD.
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