dating myocardial infarction histologically

Tammy Cooke, 28 years old


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This table gives an overview of the pathology seen in myocardial infarction by time after obstruction. From Wikipedia, the free encyclopedia. Time Gross dating myocardial infarction histologically Histopathology light microscopy 0 - 0. However, in electron microscopy relaxed myofibrils, as well as glycogen loss and mitochondrial swelling can be observered. This dye imparts a brick-red color to intact, noninfarcted myocardium where the dehydrogenase activity is preserved. Because dehydrogenases are depleted in the area of ischemic necrosis i.

Return to the tutorial menu. Dating myocardial infarction histologically heart disease is caused by an imbalance between the myocardial blood flow and the metabolic demand of the myocardium. Reduction in coronary blood flow is related to progressive atherosclerosis with increasing occlusion of coronary arteries. Blood flow can be further decreased by superimposed events such as vasospasm, thrombosis, or circulatory changes leading to hypoperfusion. Anversa and Sonnenblick, Coronary artery perfusion depends upon the pressure differential between the ostia aortic diastolic pressure and coronary sinus right atrial pressure.
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Cardiovascular magnetic resonance imaging CMR has become the gold standard not only for cardiac volume and function quantification, but for a key unique strength: non-invasive myocardial tissue characterization. Several different techniques, separately or in combination, can detect and quantify early and established myocardial pathological processes permitting better diagnosis, prognostication and tracking of therapy. The authors will focus on the histological and pathophysiological evidence of these imaging parameters in the characterization of edema, infarction, scar and fibrosis. In addition to laying out the strengths and weaknesses of each modality, the reader will be introduced to rapid developments in T1 and T2 mapping as well as the use of contrast-derived extracellular volume for quantification of diffuse fibrosis. Tissue characterization and measurement of fibrosis is a mainstay of clinical care in respiratory medicine, nephrology and hepatology, but in cardiology this has been limited to the dating myocardial infarction histologically patients who received cardiac biopsies. The emergence of cardiovascular magnetic resonance CMR is changing this. Myocardial fibrosis is inherently an important clinical parameter because fibrosis represents one of the hallmarks of pathological remodeling of the myocardium [ 1 — 4 ]. CMR has established itself over the last decade not only as the gold standard for cardiac chamber volume and function quantification, but also for non-invasive myocardial tissue characterization. Its strength lies in the use of multiple parameters to characterize myocardium.

Experimental and human studies have demonstrated that innate immune mechanisms and consequent inflammatory reaction play a critical role in cardiac response to ischemic injury. Thus, the detection of immuno-inflammatory and cellular phenomena accompanying cardiac alterations during the early inflammatory phase of myocardial infarction MI may be an excellent diagnostic tool. Current knowledge of the chronology dating myocardial infarction histologically the responses of myocardial tissue following the occurrence of ischemic insult, as well as the existence of numerous studies aiming to identify reliable markers in dating MI, induced us to investigate the myocardial specimens of MI fatal cases in order to better define the age of MI. Again, our choice of IL is explained by the synergism with neutrophilic granulocytes CD15 and our study shows the potential for striking cytokine synergy in promoting fast, local neutrophil response in damaged tissues. Control hearts from traumatic death cases did not show any immunoreactivity to the pro-inflammatory markers, neither were there any reactions in Western blot analysis.
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