…to LMCA occlusion or critical stenosis. This chapter reviews the ECG features suggestive of significant LMCA disease, including acute occlusions, subtotal stenoses, and discusses associated…

…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…

…adequacy of collateral channels. Additional features associated with greater difficulty include a previously failed attempt, a blunt proximal stump, vessel bending, calcification and an occlusion…

…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…

…primarily angiographic and clinical. No reflow should be suspected when distal coronary perfusion remains reduced despite successful treatment of the apparent epicardial stenosis and without…

…stroke constitutes 87% of all stroke cases and is further divided into the following categories: Lacunar stroke or lacunar infarct (occlusion of small penetrating arteries) :…

…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…

…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…

…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…

…myocardial ischaemia caused by transient abnormal vasoconstriction of one or more coronary arteries. Epicardial spasm produces a reversible functional occlusion and usually causes transmural ischaemia…

…mellitus and increases with age. STEMI may present as sudden onset breathlessness. Other less common presentations, with or without pain, include sudden loss of consciousness…

…an equivalent electrocardiographic pattern, suggesting acute coronary occlusion. Most patients with this working diagnosis subsequently develop myocardial necrosis and cardiac troponin elevation, although not every…

…of an acute coronary occlusion, rather than rigid ECG thresholds. Several machine learning models for ECG interpretation have been developed to differentiate between OMI and…

…to the coronary anatomy (refer to the chapter Coronary Arteries and Localization of Infarction & Ischemia). Figure 1 shows a detailed view of the coronary arteries…

…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…

…encompasses several physiological states. Brief coronary occlusion or relatively prolonged moderate ischemia may produce post ischemic stunning. In the absence of infarction, contractile recovery can…

…involve partial occlusions, resulting in subendocardial ischemia and comparatively milder symptoms. For the same reason, patients with STEMI are at higher risk of life threatening…

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

…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…

…American and European guidelines assert that the ST segment must be either downsloping or horizontal. Otherwise, ischemia is unlikely to be the cause of the…

…atherothrombotic events in chronic coronary disease; preserve the benefit of coronary intervention while limiting major and clinically relevant bleeding. Long term antiplatelet therapy after STEMI…

…itself and may arise from non ischaemic cardiac conditions (such as myocarditis) or non cardiac conditions (such as renal failure). To establish a diagnosis of…

…occlusion lesions may improve angina and quality of life, but randomized trials have not demonstrated reductions in mortality or myocardial infarction rates. Clinical presentation and…

…may be accompanied by inferior infarction if the occlusion affects both vascular territories. This will result in ST segment elevations in II, aVF and III…

…Successful reperfusion results in rapid and marked normalization (return) of ST segment elevations. If the reperfusion is complete (after a total occlusion) the ST segment…

…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…

…is a rather peculiar and certainly acute condition. Much research has been devoted to it in recent years. Most cases (70%) of takotsubo cardiomyopathy occur…

…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…

…and STE ACS (STEMI) is slightly simplified. In reality, the course in acute myocardial infarction (AMI) is modified by several factors. The most important of…

…Moreover, the pathophysiology of NSTEMI and unstable angina is very similar: both are due to partial (incomplete) coronary artery occlusions , which implies that there remains…

…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…

…repeat ECG acquisition and consideration of additional leads. Evaluation and Physical Examination At first medical contact, assessment should occur concurrently with acquisition of the initial…

…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…

…number of lesions, their location, and specific characteristics such as bifurcations, chronic total occlusions (CTOs), calcification, and thrombus presence. These factors are weighted and summed…

…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…

…to thrombin generation and fibrin deposition, culminating in a partially or fully occlusive intraluminal thrombus [5] . ACS Classification The clinical spectrum of Acute Coronary Syndromes…