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File:IPLab3AcuteMyocardialInfarction7.jpg|This is a photomicrograph of the lines of Zahn. Pale areas (1) represent platelets with some fibrin and the darker lines (2) represent RBCs and leukocytes enmeshed in fibrin strands.
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== Study Questions ==
* <spoiler text="Are the serum enzyme results consistent with the time course of this clinical history?">The infarct occurred approximately 4 days prior to death. His CPK-MB levels would be expected to have gone down by now. His AST is slightly elevated and his LDH is moderately elevated with a high LDH1:LDH2 ratio. These findings are consistent with the clinical history.</spoiler>
* <spoiler text="Why do mural thrombi often form in infarcted hearts?">The endocardium is usually the most severely damaged after an arterial occlusion since it is at the end of the circulation of the heart. Thus, with the infarcted tissue in the endocardium there is an acute inflammatory reaction which initiates coagulation and thrombus formation.</spoiler>
* <spoiler text="What is the primary cell type in this inflammatory reaction?">At this stage it is primarily neutrophils, but there area a few macrophages. Usually, neutrophils enter an infarct by 12-24 hours and macrophages enter the lesion by 72 hours post-MI. By 3-7 days the lesion is primarily macrophages and by 10 days there are macrophages, fibroblasts, and endothelial cells (granulation tissue). The healing reaction in this patient may have been slower than normal because of his poor condition.</spoiler>
{{IPLab 3}}
[[Category: IPLab:Lab 3]]