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6 Cards in this Set

  • Front
  • Back
0 - 4 hours
Gross - None

LM - None

Risk - Arrhythmia
4 - 12 hours
Gross - Dark mottling; pale with tetrazolium stain

LM - Early coagulative necrosis, edema, hemorrhage, wavy fibers

Risk - Arrhythmia
12 - 24 hours
Gross - Dark mottling; pale with tetrazolium stain

LM - Contraction bands, release of necrotic cell content into blood, beginning of neutrophil emigration

Risk - Arrhythmia
2 - 4 days
Gross - Hyperemia

LM - Extensive coagulative necrosis, tissue surrounding infarct shows acute inflammation, neutrophil emigration

Risk - Arrhythmia
5 - 10 days
Gross - Hyperemic border, central yellow-brown softening, maximally yellow and soft by 10 days

LM - Granulation tissue appears at margins

Risk - Free wall rupture, tamponade, papillary muscle rupture, interventricular septal rupture due to macrophages that have degraded important strctural components
7 weeks
Gross - Recanalized artery, gray-white scar tissue

LM - Contracted scar complete

Risk - Ventricular aneurysm