Myocardial Infarction
Myocardial Infarction - Related Videos
07:45
Acute Myocardial Infarction in Rats
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Cited by 103 •
2011
The rat model of acute myocardial infarction (AMI) is useful to study the consequence of a MI on cardiac pathophysiological and physiological function.
09:45
Histological Quantification of Chronic Myocardial Infarct in Rats
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Cited by 14 •
2016
The post-mortem assessment of myocardial infarction (MI) in rodents is based on quantification of the infarct on stained heart sections. We describe an accurate method to quantify the infarct size using systematic sampling of harvested rat hearts from base to apex and image analyses of trichrome-stained histological sections.
08:23
LAD-Ligation: A Murine Model of Myocardial Infarction
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Cited by 81 •
2009
This video demonstrates how to use a fast and reliable model to study pathobiological and pathophysiological processes of myocardial ischemia.
12:03
Myocardial Infarction and Functional Outcome Assessment in Pigs
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Cited by 52 •
2014
This protocol describes the porcine myocardial infarction (MI) model using a 90 min closed-chest coronary balloon occlusion of the left anterior descending artery (LAD), followed by reperfusion. Furthermore, the protocol for several outcome parameters, such as cardiac function, hemodynamics, microvascular resistance, and infarct size, are also presented.
07:48
Myocardial Infarction in Neonatal Mice, A Model of Cardiac Regeneration
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Cited by 37 •
2016
This protocol describes a highly reproducible model of cardiac regeneration by surgical induction of myocardial infarction in the left ventricle of postnatal day 1 mice. The method involves induction of hypothermic anesthesia and ligation of the left anterior descending coronary artery.
FAQs
The initiating event is often rupture of an atherosclerotic plaque within a coronary artery. This rupture activates platelets, which contribute to thrombus formation. As the thrombus obstructs blood flow, oxygen delivery falls, producing ischemia. If the interruption persists, the affected heart muscle progresses from oxygen shortage to irreversible tissue injury.
Prolonged interruption matters because ongoing loss of oxygen delivery extends ischemia and allows irreversible injury to develop in the affected heart muscle. This explains why myocardial infarction requires urgent recognition and treatment rather than observation alone. Restoring coronary blood flow as quickly as possible is intended to limit the amount of cardiac damage.
Symptoms, electrocardiography, and cardiac biomarkers provide complementary routes to recognition. Symptoms alert clinicians to a possible event, while the electrocardiogram and biomarker assessment contribute additional clinical evidence. Using these findings together supports rapid identification of myocardial infarction and helps initiate treatment aimed at restoring blood flow and limiting injury.
Platelet activation links plaque disruption to vessel obstruction. Once an atherosclerotic plaque ruptures, activated platelets participate in building a thrombus inside the coronary artery. That clot can restrict oxygen delivery enough to produce ischemia and, when the interruption persists, irreversible muscle injury. This sequence identifies clot formation as a key treatment target.
The immediate workflow is recognition followed by prompt assessment with symptoms, electrocardiography, and cardiac biomarkers. Once the event is identified, treatment focuses on restoring coronary blood flow and preventing further clot formation. These steps connect diagnosis to urgent intervention, with the overall aim of reducing mortality and limiting damage to heart muscle.
Restoring coronary blood flow addresses the central problem of inadequate oxygen delivery to heart muscle. By interrupting the period of ischemia, urgent treatment seeks to limit progression toward irreversible tissue injury. This objective explains why rapid intervention is associated with the broader clinical goals of reducing mortality and preserving as much cardiac tissue as possible.
Clinical management has several linked goals: reducing mortality, limiting cardiac damage, and managing complications that may follow the event. These goals extend beyond identifying the affected coronary artery; they frame the practical outcomes clinicians seek after recognition and treatment. Together, they connect acute intervention with efforts to reduce the consequences of myocardial injury.
Beyond acute care, studying myocardial infarction supports development of strategies for cardiovascular risk assessment and prevention. This research perspective asks how future risk can be recognized and how preventive approaches can reduce the likelihood of damaging coronary events. It links the mechanisms of plaque rupture and clot formation with longer-term efforts to protect cardiovascular health.