This medical infographic illustrates the experimental induction and pathophysiology of Myocardial Ischemia-Reperfusion Injury (MIRI) in an in vivo model. On the left, a clinical photograph displays a surgical field where coronary artery ligation is performed on an exposed heart; a circular inset uses an arrow to highlight the precise site of vessel occlusion. To the right, a horizontal timeline diagram outlines the resulting pathological sequence. The initial ligation leads to ischemia, which if extended, triggers inflammation and subsequent cardiomyocyte death. The diagram also illustrates 'Immediate Reperfusion' as a 'double-edged sword' that, after a threshold time, causes the generation of oxygen-free radicals (reactive oxygen species). The flowchart integrates pharmacological intervention points, indicating where natural compounds (likely flavonoids based on the icons) can be utilized in 'Primary Prophylaxis' prior to the ischemic event or 'Secondary Prophylaxis' during the reperfusion phase. This visual resource is designed to teach the mechanisms of acute cardiac injury and the potential role of antioxidants in cardiovascular protection.

Two diagnostic images showing coronary angiography findings in a patient with suspected myocardial ischemia. The left panel displays the left coronary system, with labels identifying the Left Anterior Descending (LAD) artery and the Left Circumflex (LCX) artery. The LAD is seen descending toward the cardiac apex with visible diagonal branches, while the LCX courses posteriorly along the atrioventricular groove with visible marginal branches. The right panel displays the Right Coronary Artery (RCA) in a C-shaped configuration, showing its descent along the right side of the heart and its posterior interventricular branches. Both panels demonstrate smooth vessel contours, normal physiological tapering, and unobstructed contrast flow through the epicardial coronary arteries. There are no signs of significant stenosis, occlusion, or coronary artery disease, which helps differentiate myocarditis from acute myocardial infarction in a clinical setting.

This composite medical image illustrates the diagnostic evaluation of coronary artery disease using invasive and non-invasive modalities. Image (a) is an invasive coronary angiography (ICA) frame showing significant stenosis in the left anterior descending (LAD) artery, highlighted by a red arrowhead. A text annotation at the bottom indicates a fractional flow reserve (FFR) of 0.70, signifying hemodynamically significant ischemia. Images (b) and (c) present three-dimensional computed tomography (CT) reconstructions of the heart. Image (b) utilizes a Voronoi diagram to delineate myocardial territories, with a purple-shaded region representing the stenosis-related area. Image (c) provides a color-coded myocardial perfusion map; the red-outlined region identifies the area of reduced blood flow corresponding to the LAD lesion. An arrow points to this region with a quantitative perfusion ratio (CT-QPR) value of 0.74, demonstrating high correlation with the invasive FFR measurement. These panels collectively demonstrate how advanced CT post-processing can identify ischemia-prone myocardial territories distal to a coronary stenosis.

This infographic and diagnostic diagram illustrates a human torso and biventricular electrophysiology model for simulating acute regional myocardial ischemia and its effects on ECG signals. Panel A displays a 3D mesh torso model with standard 12-lead ECG electrode placements and cross-sectional schematic representations of the heart. These schematics distinguish between transmural ischemia (affecting the full thickness of the myocardium) and subendocardial ischemia (confined to the inner layer), highlighting the Ischemic Core Zone (ICZ) and Border Zone (BZ) in relation to LAD and LCX coronary artery occlusions. Panel B provides a side-by-side comparison of computer-simulated ECG signals and clinical recordings from a patient with LAD occlusion, demonstrating characteristic ST-segment elevation in precordial leads V1-V6 during transmural ischemia. Panel C compares simulated and clinical ECG data for subendocardial ischemia, focusing on lead V4 to show characteristic ST-segment depression. This resource serves as an educational tool for understanding the electrophysiological correlation between the depth of myocardial injury and surface ECG manifestations.