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21 Cards in this Set
- Front
- Back
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Myocardial infarction: Definition
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Irreversible hypoxia and cell death because of prolonged hypoxia
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How long can myocardial cell survive in a hypoxic state?
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20 mins
*brain cells can only survive 3-5 mins |
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what are some problems with using anaerobic metabolism?
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not as efficient
lactic acid injures cells doesnt meet oxygen demand |
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Potassium plays a major role in the heart's ...?
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contractility
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Catecholamines that effect contractility
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epinephrine and norepinephrine
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enzyme levels are use to evaluate..?
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amoutn of cell death
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how often are enzyme levels taken?
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every 6 hours for three tests
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structural/functional changes from an MI depend on ... and ...
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size and location of affected area
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what is the end result of the inflammatroy response after an MI?
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WBCs==> collagen deposits
**scar tissue |
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how does scar tissue effect CO
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dec compliance=> dec CO
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How long does it take for the heart to recover?
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about six weeks
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MI symptomatic pain (usually severe) in the elderly can radiate?
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down the back
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What are the S&S related to sympathetic stimulation?
(3) |
1) nausea/vomiting
2) cool/pale/clammy skin 3) Initial inc in HR and BP |
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Fever associated with MI is related to .?
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Inflammatory response
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90% of MI develop this complication
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dysrhythmias- can result from SA node injury and disturbed conductivity
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how can congestive heart failure can result from an MI?
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dec compliance due to scar tissue results in a decreased CO and not enough oxygen delivery to tissues
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In an MI the ST segment on an EKG is..?
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elevated
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echocardiogram- heart ultrasound- allows you to..?
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view contraction and evaluate damage
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Why is morphene a good choice for treating an MI?
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pain killer and lowers blood pressure
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EKG montoring and supplemental oxygen are examples of?
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MI treatments
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Aspirin and anticoagulants ie heparin- in addition to vasodilators are given to..
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prevent clot formation and lower blood pressure
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