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Sequential changes in MI

Gross sequence of Changes in MI

Time

Predominant finding

0 to 18 hours

No gross changes

18 to 24 hours

Vague pallor and softening

1 to 7 days

Yellow scar

7 to 28 days

Central scar formation with red border

Months

Thick white Firm scar formation


Microscopic changes in MI

Survival Time

Predominant Finding

1-4 hours

Wavy myocyte fibers, contraction bands

4-24 hours

Coagulative necrosis

1 to 3 days

Neutrophil infiltration

3 to 7 days

Macrophage infiltration

7 to 28 days

Granulation tissue

Months

Fibrotic scar

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