Mechanical obstruction of an artery resulting in hypoxia is the basis for ischemia. Elevated cardiac troponin levels indicate myocardial injury. Myocardial ischemia: reactions, ECG and development of infarction As all other cells in the human body, cardiac myocytes use ATP (adenosine triphosphate) as the primary energy source. ATP is produced by metabolizing carbohydrates (glucose), fats or proteins, whichever is available. Ischemic heart disease, the leading cause of death worldwide, may result in devastating perioperative ischemia and infarction. Myocardial injury vs Myocardial infarction. Summary – Ischemia vs Infarction. In patients with myocardial ischemia or infarction, findings on the ECG are influenced by multiple factors, including the following: Duration – Hyperacute/acute versus evolving/chronic Size – Amount of myocardium affected Anatomic location – Anterior, lateral, or inferior-posterior An impairment of the venous drainage can also cause ischemic tissue damages. But all cases of troponin elevation are not due to myocardial ischemia. Distinguish between the effects of myocardial ischemia and infarction on the heart Key Points Ischemic heart disease (IHD), or myocardial ischaemia, is a disease characterized by ischaemia, or, reduced blood supply, to the heart muscle, usually due to coronary artery disease and myocardial infarction. Ischemia is the commonest form of cell injury in medicine. The underlying pathophysiology, precipitating factors, and approach to prevention differ between patients presenting for noncardiac surgery, developing acute coronary syndrome versus stable angina.

myocardial ischemia vs infarction

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myocardial ischemia vs infarction 2020