…is to scrutinize potential cardiac sources of emboli and to evaluate the carotid and cerebral arteries. Ultrasound may reveal atherosclerotic plaques, thrombi, occlusions, and dissections…

…and noncoronary cusp (NCC), showing the same branches as in panel A for cross modality comparison. Clinical features Occlusion of the left main coronary artery…

…STEMI usually results from rapid thrombotic occlusion of a previously atherosclerotic coronary artery. Slowly progressive severe stenoses are less likely to cause STEMI because collateral…

…the occlusion when the patent donor artery is injected. The collateral circulation therefore has both physiological importance and procedural relevance. The principal anatomical determinants of…

…regional abnormalities in contractile function. The abnormalities affect the myocardial area supplied by the arteries distal to the occlusion or stenosis. If the ischemia persists…

…Clinical medicine Definition and pathophysiology Peripheral artery disease (PAD) is a clinical disorder caused by stenosis or occlusion of the aorta or arteries supplying the…

…by the affected artery. Large areas of jeopardized myocardium, severe baseline stenosis, multivessel coronary artery disease, and diffuse disease increase the likelihood of cardiovascular collapse…

…in the absence of a flow limiting epicardial stenosis. It is associated particularly with intervention on degenerated saphenous vein grafts, rotational atherectomy, and acute MI…

…coronary artery and the location of the occlusion, is clinically important. As discussed below, this information can aid in diagnosing ischemia and infarction and guide…

…small vessels, multivessel disease, bifurcation lesions, treatment of acute myocardial infarction Procedural and mechanical Stent underexpansion, incomplete wall apposition, residual inflow or outflow disease, edge…

…vasoconstriction of one or more coronary arteries. Epicardial spasm produces a reversible functional occlusion and usually causes transmural ischaemia. The resulting abnormalities in left ventricular…

…evidence of peripheral embolism, or an unexplained drop in arterial pressure. Silent or unrecognized infarction occurs more often in patients without antecedent angina and in…

…extent and degree of myocardial involvement The anatomical territory, including anterior, inferoposterolateral or right ventricular involvement Pre existing abnormalities such as prior infarction, left bundle…

…and angiographic findings. OMI is defined by acute coronary artery occlusion causing transmural ischemia and requiring urgent reperfusion, even in the absence of classic ST…

…affected, then the left ventricle is virtually always affected due to the coronary anatomy (refer to the chapter Coronary Arteries and Localization of Infarction & Ischemia)…

…by rhabdomyolysis, with potential renal failure and increased mortality. Clinical presentation and symptoms Symptoms commonly develop rapidly, often within an hour of arterial occlusion. The…

…opening of a persistently occluded infarct related artery in a stable and asymptomatic patient is by contrast not recommended [1,5]. STEMI criteria and occlusion…

…CT of the brain and CT angiography from the aortic arch to the vertex. 8. Contact the thrombectomy centre immediately where large vessel occlusion is…

…extensive MI with necrosis and scar formation Diffuse myocardial fibrosis Reversible ischemic dysfunction Chronic hypoperfusion with hibernating myocardium Post ischemic stunning Adverse left ventricular (LV…

…tachycardia (VT) and ventricular fibrillation (VF) may occur at any time after occlusion of the coronary artery. Indeed, ventricular tachycardia and ventricular fibrillation cause the…

…a limb with arterial insufficiency can cause necrosis and, in the worst case, amputation. The decisive step is therefore not the choice of dressing but…

…based, high and symmetric. Their duration is short; they typically disappear within minutes after a total occlusion in a coronary artery occurs (then of course…

…segment depressions with prominent T waves in the majority of the chest leads may indicate an acute occlusion in the LAD (left anterior descending artery)…

…disease. Antiplatelet therapy is a central component because platelet activation and aggregation contribute importantly to arterial thrombus formation, recurrent coronary occlusion, and stent thrombosis. Aspirin…

…a periprocedural myocardial infarction associated with coronary artery bypass grafting (CABG). Clinical Presentation and Symptoms The diagnosis of an acute MI remains a comprehensive clinical…

…anatomic complexity and comorbidity, which themselves may contribute to progression of native coronary artery disease. The chronic total occlusion is an important predictor of incomplete…

Myocardial ischemia and infarction ECG Posterior (posterolateral) acute myocardial infarction (STEMI) The heart is rotated 30° to the left in the thorax. This positions the…

…are robust indicators of successful reperfusion (patent artery). This is also associated with better prognosis, return of R wave amplitudes, and improved left ventricular function…

…by partial occlusion of the artery (i.e. coronary blood flow is not completely obstructed). NSTE ACS typically presents with ST segment depressions and/or…

…note that posterolateral and right ventricular infarction may occur simultaneously (if both territories are affected by the same artery occlusion). Approximately 30% of patients with…

…no coronary artery occlusion can be identified. Injection of contrast media into the ventricle will instead reveal that the apical portion of the left ventricle…

…by thrombotic occlusion of a previously atherosclerotic artery. Plaque erosion or rupture exposes thrombogenic material to circulating blood. Platelets adhere, become activated, and aggregate through…

…of a chronic total coronary occlusion. Angina or ischaemia with non obstructive coronary arteries (ANOCA/INOCA), after appropriate investigation has identified the relevant endotype and…

…Syndrome) : STE ACS occurs when plaque rupture, and the ensuing atherothrombosis, causes a complete occlusion of the coronary artery. Ischemia will extend from the endocardium…

ECG Myocardial ischemia and infarction Acute Myocardial Infarction: Definition & Criteria Acute myocardial infarction is the most severe complication of coronary artery disease. The most common…

…applying a 5 minute occlusion reflow cycle repeatedly to the circumflex artery before a 60 minute occlusion of the left anterior descending coronary artery (LAD)…

…30 days if left untreated. Moreover, the pathophysiology of NSTEMI and unstable angina is very similar: both are due to partial (incomplete) coronary artery occlusions …

…Syndrome) : STE ACS occurs when plaque rupture, and the ensuing atherothrombosis, causes a complete occlusion of the coronary artery. Ischemia will extend from the endocardium…

…after coronary occlusion and progress over time. Experimentally, necrosis advances from the subendocardium towards the subepicardium over several hours. The extent and tempo of injury…

…ischemia and infarction Definition and Pathophysiology Posterior myocardial infarction is myocardial necrosis involving the posterior region of the left ventricle, usually as part of an…

…and form of the thrombus, it will occlude the main pulmonary artery or its branches. The larger the thrombus, the more proximal the occlusion and…

…in the chapter ST elevations in ischemia and differential diagnoses. In cardiac arrest caused by acute total occlusion of an epicardial coronary artery (i.e…

…and contractile function of myocardial fibers The left ventricular wall can be subdivided into several layers. These layers are similar to those seen in arteries…

…formation of thrombi in the left atrial appendage . Such thrombi may leave the appendage and enter the systemic circulation which causes thromboembolic occlusions of arteries…

…substantial number of these patients had complete coronary artery occlusions, and outcomes improved when they were treated as acute STEMI cases. Management of left bundle…

…left main coronary artery disease . It integrates multiple variables, including the number of lesions, their location, and specific characteristics such as bifurcations, chronic total occlusions…

…or at least four drinks for women or five for men on one occasion. Pharmacokinetics and pathophysiology Approximately 95% of ingested ethanol undergoes hepatic metabolism…

…chronic, progressive, and highly dynamic inflammatory disease of the arterial wall. It is characterized by the subendothelial accumulation of apolipoprotein B containing lipoproteins, macrophage infiltration…