Pathological changes seen in Myocardial Infarction

Question 1

Changes seen <8hrs post MI?

Answer 1

Macroscopic = No change
Microscopic = Wavy fibers, contraction bands in areas of reperfusion

Question 2

Changes seen 8-24hrs post MI?

Answer 2

Macroscopic = Pallor discernible
Microscopic = Early coagulative necrosis and light neutrophil infiltrate

Question 3

Changes seen 1-3 days post MI?

Answer 3

Macroscopic = Pallor 
Microscopic = Established coagulative necrosis and heavy neutrophil infiltrate

Question 4

Changes seen 3-7 days post MI?

Answer 4

Macroscopic = Yellowish and soft
Microscopic = Macrophage infiltrate

Question 5

Changes seen 7-10 days post MI?

Answer 5

Macroscopic = yellow with red periphery 
Microscopic = Granulation tissue and start of collagen scar

Question 6

Changes seen 2weeks - 2months post MI?

Answer 6

Macroscopic = White scar 
Microscopic = Collagen formation and dense collagenous scar