09-25-2007, 11:07 AM
Evolution of MI:
A) First Day= no changes in first 2-4hrs. After 4hrs there is coagulative necrosis - contraction bands visible, release of necrotic contents into bloodstream & begining of neutrophil emigration
B) 2-4 Days= RISK FOR ARRHYTHMIA- tissue surrounding infarct shows acute inflammation, hyperemia (dilated vessels), neutrophil emigration, & muscle shows extensive coagulative necrosis
C) 5-10 Days= RISK FOR FREE WALL RUPTURE- presence of outer zone (ingrowth of granulation tissue), macrophages & neutrophils
D) 7 Weeks= RISK FOR VENTRICULAR ANEURYSM- recanalized artery & contracted scar complete
A) First Day= no changes in first 2-4hrs. After 4hrs there is coagulative necrosis - contraction bands visible, release of necrotic contents into bloodstream & begining of neutrophil emigration
B) 2-4 Days= RISK FOR ARRHYTHMIA- tissue surrounding infarct shows acute inflammation, hyperemia (dilated vessels), neutrophil emigration, & muscle shows extensive coagulative necrosis
C) 5-10 Days= RISK FOR FREE WALL RUPTURE- presence of outer zone (ingrowth of granulation tissue), macrophages & neutrophils
D) 7 Weeks= RISK FOR VENTRICULAR ANEURYSM- recanalized artery & contracted scar complete