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22 Cards in this Set
- Front
- Back
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What are the gross changes seen 0-6 hrs after an MI?
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None
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What are the gross changes seen 12 hrs after an MI?
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None
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What are the gross changes seen 12-24 hrs after an MI?
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Swelling and color change
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What are the gross changes seen 24 hrs after MI?
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Tan or red-brown infarct surrounding hyperemia
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What are the gross changes seen 3 days after MI?
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Increasingly yellow color of infarct
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What are the gross changes seen 7 dyas after MI?
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Yellow infarcted area surrounded by congested red border
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What are the gross changes seen 10 days after MI?
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Red. mewly formed vascular CT that encircles and gradually replaces yellow necrotic tissue
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What are the gross changes seen 5 weeks after MI?
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Increasing pallor of infarct b/c of progressive fibrosis
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What are the gross changes seen 3-6 months after MI?
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Well developed gray-white scar
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What microscopic changes are seen 0-6 hrs after MI?
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Slight swelling and cellular congestion
Vascular congestion surrounding lesion |
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What microscopic changes are seen 12 hrs after MI?
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Neutrophils first appear in viable tissue adjacent to lesion
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What microscopic changes are seen 12-24 after MI?
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Cytoplasm becomes more acidophilic
Striations are lost Nuclei disappear Neutrophils infiltrate the lesion |
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What microscopic changes are seen 24 hrs after MI?
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Well developed changes of coagulative necrosis
Progressive infiltration of neutrophils |
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What microscopic changes are seen 3 days after MI?
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Neutrophils are replaced by macrophages
Phagocytosis of debris begins |
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What microscopic changes are seen 7 days after MI?
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Beginning of growth of young fibroblasts and newly formed vessels into the lesion
REplacement of neutrophils by macrophages and phagocytosis continues |
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What microscopic changes are seen 10 days after MI?
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Fibrovascular tissue growth continues
Almost complete replacement of neutrophils by macrophages Phagocytosis almost complete |
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What microscopic changes are seen 2-4 weeks after MI?
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Progressive synthesis of collagen and other intracellular matrix proteins
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What microscopic changes are seen 5 weeks after MI?
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Progressive fibrosis
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What microscopic changes are seen 3-6 months after MI?
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Mature fibrous tissue replaces area of infarction
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When is arrhythmia most likely to occur following MI?
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0-6 hrs (most common cause of death in early hours following MI)
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What is the clinical risk during 4-7 days after MI?
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Myocardial rupture --> cardiac tamponade
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What is the clinical risk 3-6 months after MI?
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Ventricular aneurysm can occur in scarred area
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